Showing papers on "Trickling filter published in 2016"
TL;DR: Compared with inoculated sludge, the biofilm in NVTFs had more abundant biodiversity after long-time domestication, and microorganism distribution in biofilm of zeolite NVTF was more similar with ceramsite, compared with sponge.
50 citations
TL;DR: The results obtained confirmed that metabolic profiles could be used to monitor treatment processes as valuable biological indicators of onsite wastewater treatment technologies efficiency and showed that the diversity and CLPPs of microbial communities depended on the working efficiency of the wastewatertreatment technologies.
Abstract: The aim of the study was to determine the potential of community-level physiological profiles (CLPPs) methodology as an assay for characterization of the metabolic diversity of wastewater samples and to link the metabolic diversity patterns to efficiency of select onsite biological wastewater facilities. Metabolic fingerprints obtained from the selected samples were used to understand functional diversity implied by the carbon substrate shifts. Three different biological facilities of onsite wastewater treatment were evaluated: fixed bed reactor (technology A), trickling filter/biofilter system (technology B), and aerated filter system (the fluidized bed reactor, technology C). High similarities of the microbial community functional structures were found among the samples from the three onsite wastewater treatment plants (WWTPs), as shown by the diversity indices. Principal components analysis (PCA) showed that the diversity and CLPPs of microbial communities depended on the working efficiency of the wastewater treatment technologies. This study provided an overall picture of microbial community functional structures of investigated samples in WWTPs and discerned the linkages between microbial communities and technologies of onsite WWTPs used. The results obtained confirmed that metabolic profiles could be used to monitor treatment processes as valuable biological indicators of onsite wastewater treatment technologies efficiency. This is the first step toward understanding relations of technology types with microbial community patterns in raw and treated wastewaters.
38 citations
TL;DR: In this paper, a work table olive processing wastewaters (TOPW) were treated by aerobic biological processes using indigenous microorganisms originating from TOPW, as well as the combination of two successive steps, i.e. aerobic biological treatment followed by electrochemical oxidation over a boron-doped diamond anode.
20 citations
04 Mar 2016-Journal of Environmental Science and Health Part A-toxic\/hazardous Substances & Environmental Engineering
TL;DR: One-dimensional advective-dispersive models were formulated to describe the transport of Mn in trickling filter porous media and predicted that a filter depth of only 16 cm is needed to reduce influent concentration of 10 mg L−1 to 0.05 mg L+1.
Abstract: Biological oxidation has been researched as a viable alternative for treating waters with high manganese (Mn) concentrations, typically found in mine drainage or in some geological formations. In this study, laboratory-scale trickling filters were constructed to compare the Mn removal efficiency between filters inoculated with the Mn oxidizing bacteria, Pseudomonas putida, and filters without inoculation. Manganese oxidation and removal was found to be significantly greater in trickling filters with Pseudomonas putida after startup times of only 48 h. Mn oxidation in Pseudomonas putida inoculated trickling filters was up to 75% greater than non-inoculated filters. One-dimensional advective-dispersive models were formulated to describe the transport of Mn in trickling filter porous media. Based on the experimental transport parameters obtained, the model predicted that a filter depth of only 16 cm is needed to reduce influent concentration of 10 mg L(-1) to 0.05 mg L(-1).
19 citations
TL;DR: In this paper, the authors proposed a novel pressurized high-rate hydrogenotrophic reactor for denitrification without gas purging and showed that during continuous operation a gas-liquid equilibrium is established in the reactor according to Henry's law and excess N2 gas is carried out by the effluent in dissolved form.
19 citations
TL;DR: In this article, an indigenous media trickling filter was designed and developed using maize cobs as packing material for biofilm growth, and the MCTFWWT system was continually operated and monitored for six months at constant hydraulic wastewater loading of about 113±2 m3 per m2 per day.
Abstract: In developing countries, good-quality water is contaminated due to the disposal of untreated municipal and industrial wastewater (WW) into natural water reservoirs. Most of the wastewater is not treated properly according to international standards, and usually is disposed of and/or utilized for irrigation without appropriate treatment. The main hurdles in providing wastewater treatment (WWT) in developing countries include high costs, and the poor design, installation, and operation of conventional WWT systems. Therefore, the present study explores the maize cobs trickling filter-based (MCTF) low-cost WWT option for developing countries like Pakistan, India, and Bangladesh. In this regard, indigenous media trickling filter was designed and developed using maize cobs as packing material for biofilm growth. The MCTFWWT system was continually operated and monitored for six months at constant hydraulic wastewater loading of about 113±2 m3 per m2 per day. The experimental data covers winter and summer seasons with temperature variations from 23oC to 43oC. System performance was evaluated by means of various WWT parameters, including biological and chemical oxygen demands (BOD5 and COD), total suspended and dissolved solids (TSS and TDS), turbidity, and color – before and after WWT. Experimental results showed that the MCTF-WWT system successfully removed about 79% BOD and 75% COD on average. The key reason for effective BOD and COD removal was rapid development of microbial film (within the first two *e-mail: muhammadsultan@bzu.edu.pk DOI: 10.15244/pjoes/63657 2266 Imran A., et al.
18 citations
TL;DR: Several process parameters influential in nitrifying filtration were established on experimental biofilters and their efficiency was tested, based on the removal of nitrogen contained in total ammonia nitrogen (N-TAN), and notable differences were observed in the ammonia removal rates depending on different process parameters.
Abstract: This work focuses on the achieving of optimal design and modelling of nitrifying trickling filters for closed circuit aquaculture turbot ( Psetta maxima ) farms. Several process parameters influential in nitrifying filtration were established on experimental biofilters and their efficiency was tested, based on the removal of nitrogen contained in total ammonia nitrogen (N-TAN) in a fixed time (24 h). Those process parameters were filter media types (Type A Biofill ® , BactoBalls ® and MECHpro ® rings), temperatures (24.3 °C, 19.0 °C, 15.3 °C) and production of TAN (1.5, 3.0 and 4.5 g per day) while other process parameters values remained constant. TAN production was simulated with the addition of ammonium chloride (NH 4 Cl) in the recirculation system. Constant measuring of the total ammonia nitrogen concentration in the biofilter effluent was required to perform a model of N-TAN fluctuation based on a specific feeding regime and to ascertain performance differences between biofilters. At the end of the experiment, notable differences were observed in the ammonia removal rates depending on different process parameters. The BactoBalls ® filter medium led to the highest mean N-TAN removal rates (0.24 g N-TAN removed m −2 day −1 ). The N-TAN removal rate generally increased with higher temperatures, the trials with the highest mean temperature (24.3 °C) led to the highest mean N-TAN removal rate (0.26 g N-TAN removed m −2 day −1 ). Similarly, the N-TAN removal rate increased with high TAN production. The trials in which production was 4.5 g per day showed the highest N-TAN mean removal rate (0.27 g N-TAN removed m −2 day −1 ).
16 citations
TL;DR: In this paper, the authors evaluated the performance of a bench-scale anaerobic baffled reactor (ABR) at 15-20°C, with domestic wastewater, and compared it to a conceptual design of treatment with trickling filter+anaerobic digestion (TF+AD).
Abstract: Anaerobic treatment offers a sustainable alternative to aerobic treatment by recovering energy from wastewater. Anaerobic treatment, however, is challenged by reduced performance at lower temperatures and dissolved methane in the effluent, which represents a loss in recoverable energy and a potent greenhouse gas emission. Long-term operation of a bench-scale anaerobic baffled reactor (ABR) at 15–20°C, with domestic wastewater, provided data to evaluate life cycle environmental and economic performances of mainstream anaerobic treatment. Performance of the ABR was compared to a conceptual design of treatment with trickling filter+anaerobic digestion (TF+AD). The ABR and TF were modeled as example low-cost anaerobic and aerobic treatments, respectively, because these technologies may be more easily implemented (compared to membrane systems and activated sludge) in developing countries. This type of comprehensive study, not conducted previously for the ABR, is imperative for selecting appropriate te...
13 citations
TL;DR: TF had the smallest environmental impacts and that AS had the largest, while HRAAD was in between the two but with much reduced impacts compared with AS, and shows that lower sludge production is the greatest advantage of HRAad for reducing environmental impacts.
12 citations
10 citations
TL;DR: The reactor proved to be an effective device enabling the increase of total nitrogen removal from 53.5% to 86.0% and immobilization of a small amount of biomass was less prone to leaching of the biomass and the occurrence of scum and swelling sludge.
TL;DR: In this article, the authors developed a hybrid BSF system, called as a trickling biosand filter (TBSF), which is combined with rock media as trickling filter to reduce organic matters.
Abstract: Access to safe drinking water is still unavailable to many people in developing countries. Biosand filter (BSF) is one of the most promising emerging point of use technologies. A large amount of organic matters is contained in their water source. The purpose of this study is to develop a hybrid BSF system, called as a trickling biosand filter (TBSF), which is combined with rock media as trickling filter to reduce organic matters ranged from CODcr 50 to 150 mg/L in source water. The effects of TBSF and BSF on the factors as CODcr, flux, turbidity, and DO are analyzed. Results showed that the effluent CODcr of TBSF was obtained 2.3–4.2 mg/L during 41 d. However, that of BSF fluctuated within 13.1–28.6 mg/L. DO in standing water of TBSF increased to average 7.8 mg/L while that of BSF decreased to average 1.2 mg/L. DO played an important role to activate microbial activity in trickling filter and to ripen Schmutzdecke layer to decrease constantly turbidity and Escherichia coli (E. coli) in TBSF, thoug...
TL;DR: Biodegradable DON is a portion of DON that is biologically degradable by bacteria when the optimum environmental conditions are met, and all four computing techniques could be employed successfully to predict BDON.
Abstract: Wastewater-derived dissolved organic nitrogen (DON) typically constitutes the majority of total dissolved nitrogen (TDN) discharged to surface waters from advanced wastewater treatment plants (WWTPs). When considering the stringent regulations on nitrogen discharge limits in sensitive receiving waters, DON becomes problematic and needs to be reduced. Biodegradable DON (BDON) is a portion of DON that is biologically degradable by bacteria when the optimum environmental conditions are met. BDON in a two-stage trickling filter WWTP was estimated using artificial intelligence techniques, such as adaptive neuro-fuzzy inference systems, multilayer perceptron, radial basis neural networks (RBNN), and generalized regression neural networks. Nitrite, nitrate, ammonium, TDN, and DON data were used as input neurons. Wastewater samples were collected from four different locations in the plant. Model performances were evaluated using root mean square error, mean absolute error, mean bias error, and coefficient...
Journal Article•
TL;DR: Although trickling filters are designed with a variety of shapes, sizes, and operating modes, all units operate in essentially the same manner as mentioned in this paper, where the wastewater being treated is contacted with a large area of microbial culture and the system is ventilated so that aerobic conditions are maintained within the culture.
Abstract: Although trickling filters are designed with a variety of shapes, sizes, and operating modes, all units operate in essentially the same manner. The wastewater being treated is contacted with a large area of microbial culture, and the system is ventilated so that aerobic conditions are maintained within the culture. The basic concepts are illustrated in Figure 1. A layer of microbial mass adheres to a support phase and wastewater flows over the surface of the microbial mass. As the wastewater flows over the slime, the various pollutants and nutrients contained in it, to gether with dissolved oxygen, diffuse into the slime layer where the pollutants are metabolized by the bacteria. The essential processes are mass transport and biod?gradation.
TL;DR: A new biological nitrification–denitrification system was constructed with a trickling filter for nitrification, suitable in tropical and subtropical areas with annual minimum temperatures of over 15°C and the DN removal efficiencies did not reach theoretical values for all conditions tested.
Abstract: In the modified Ludzack–Ettinger process, high-energy input is required in a nitrification tank. To address this issue, a new biological nitrification–denitrification system was constructed with a trickling filter for nitrification. The effects of recirculation rate of nitrified liquor and temperature through the treatment of municipal wastewater were evaluated. The highest DN removal efficiency was observed at 6.5 h of hydraulic retention in the denitrification tank and 350% of recirculation rate of nitrified liquid against the influent flow rate. The DN removal efficiencies did not reach theoretical values for all conditions tested because the COD/N ratios in the influent often decreased to less than 5 g-COD/g-N and temperatures dropped to less than 15°C in winter. The former inhibited the denitrification process and the latter significantly decreased the bioactivity of nitrifying bacteria. As such, this system is suitable in tropical and subtropical areas with annual minimum temperatures of over 15°C.
01 Jan 2016
TL;DR: In this article, the maximum possible rate of oxygen transfer is determined by estimating the maximum acceptable rate of the oxygen uptake in the waste water, and a limitation on minimum recycle rate is also provided.
Abstract: U. S. have exhibited severe oxygen transfer rate limitations. The growing use of trickling filters for the treatment of strong industrial wastes, both as "roughing filters" and as the terminal treatment process, increases the probability of de signing processes with built-in limitations. Examples already exist in which the neces sity of modifying standard municipal treat ment plant design criteria when industrial wastewaters are involved has been demon strated.1 Busch2 noted that oxygen transfer cannot exceed the rate of oxygen utilization and vice versa. This approach seems to be the simplest method of defining and estimating mass transfer limitations on trickling filters. By estimating the maximum possible rate of oxygen transfer, the maximum accept able rate of oxygen uptake is determined. Knowing the maximum oxygen uptake rate allows estimation of the maximum biochemical oxygen demand (bod) con centration in the waste water. Because the maximum bod concentration deter mined is that at the application point, a limitation on minimum recycle rate is also provided. This limitation is particularly useful for industrial wastewater treatment process design in which flow equalization is not a significant problem. The bod concentration specified will be the ultimate or total bod because this value reflects the reactive organic concentration. Oxygen Transfer Rate The description of liquid and air flow through a trickling filter and of the organic removal reactions is extremely difficult, and a number of approximations must be made. To begin with, flow is intermittent. Most trickling filters in use today have rotary distributors that provide a semi continuous liquid application. Once on the media, the flow would be expected to channelize; thus, conditions in small sec tions of the media are probably not homogeneous. In addition, two types of reaction systems may be described : quasi homogeneous systems resulting from cells suspended in the liquid and heterogeneous systems resulting from the uptake of organics by organisms in the slime. A schematic diagram of the flow and reaction system is given in Figure 1. The worst possible case would seem to occur when the liquid film entirely covers the media-slime surface. This is because oxygen transfer directly into the slime should be considerably faster than that through the liquid and into the slime. An estimate of the maximum rate of oxygen Liquid
Journal Article•
TL;DR: In this paper, the authors illustrate several types of biofilters such as trickling filter (TF), rotating biological contactor (RBC), fixed bed filters, moving bed biofilm reactor (MBBR), and fluidized bed filters (FB).
Abstract: Among all biological processes for treatment of wastewater, biological filtration method is used as a secondary treatment technology for improving certain kinds of wastewaters. The present work was aimed to illustrate several types of biofilters such as trickling filter (TF), rotating biological contactor (RBC), fixed bed filters, moving bed biofilm reactor (MBBR), and fluidized bed filters (FB). An overview of each technique, operational parameters, typical standards, advantages and shortcomings of each method were revealed as well. Moreover, applications suitability of various attached growth processes for the treatment of different wastewaters of other investigators were outlined. Published works reported that applications of biofilm technology are efficient for treatment of weak wastewaters such as municipal wastewater with low strength rates. In addition, biological filtration process particularly TFs are unproductive for treatment of strong wastewaters which contains high concentrations of organic matter, nitrogen compounds, heavy metals, phenols, grease and oil, and low biodegradability ratio. Suggestions were outlined for enhancing efficiency of biological filtration process for treatment of high organic loading rate wastewaters.
TL;DR: The membrane hybrid system for drinking water that combines a trickling filter and a thin-layer biosand filter (TBSF) prior to membrane showed higher TOC removal and turbidity reduction than hybrid systems only with BSF + MF membrane.
TL;DR: The indispensable role of Kentucky bluegrass for better treatment performance was proved, as it enhanced the cell-specific nitrification potential of the soil nitrifying microorganisms inhabiting the rhizosphere.
Abstract: To develop a sound post-treatment process for anaerobically-digested strong wastewater, a novel natural treatment system comprising two units is put forward. The first unit, a trickling filter, provides for further reduction of biochemical oxygen demand and adjustable nitrification. The subsequent soil–plant unit aims at removing and recovering the nutrients nitrogen (N), phosphorus (P) and potassium (K). As a lab-scale feasibility study, a soil column test was conducted, in which black soil and valuable Kentucky bluegrass were integrated to treat artificial nutrient-enriched wastewater. After a long-term operation, the nitrification function was well established in the top layers, despite the need for an improved denitrification process prior to discharge. P and K were retained by the soil through distinct mechanisms. Since they either partially or totally remained in plant-available forms in the soil, indirect nutrient reuse could be achieved. As for Kentucky bluegrass, it displayed better growth status when receiving wastewater, with direct recovery of 8%, 6% and 14% of input N, P and K, respectively. Furthermore, the indispensable role of Kentucky bluegrass for better treatment performance was proved, as it enhanced the cell-specific nitrification potential of the soil nitrifying microorganisms inhabiting the rhizosphere. After further upgrade, the proposed system is expected to become a new solution for strong wastewater pollution.
01 Jan 2016
TL;DR: A detailed evaluation of the feasibility of using plastic media trickling filters in a stage treatment system to achieve high-level biological nitrifica tion is presented in this paper, where the authors describe the evaluation of controlling parameters, operational control, basic design guidelines, and economics for plastic media-trickling filter nitrification.
Abstract: cently been receiving increased at tention in evaluations of the overall effect of treated wastewater effluent on a receiv ing body of water. Major emphasis has been placed on removal of biochemical oxygen demand and suspended solids (ss) from wastewater with little distinction be ing made between carbonaceous and nitro genous forms of oxygen demand. Many efficiently operated conventional biological treatment facilities are capable of high removals of carbonaceous mate rial (greater than 90 percent). However, these same facilities have been shown to remove only 10 to 60 percent of influent nitrogen.1'2 The wide range of removals is indicative of the relative unpredictability of the nitrification process in most current treatment systems. The resultant nitrogen laden effluents have been shown to play a significant role in the oxygen balance of receiving waters. Work done by the Michigan Water Re sources Commission indicated that the most important source of oxygen demand in the Grand River below Lansing was nitrogenous in origin.3 It accounted for as much as 75 percent of the total oxygen depletion within a 10-mile (16.1-km) stretch below that city. Similarly, Wezer nak and Gannon4 concluded from studies on the Clinton River below Pontiae, Mich., that the major deoxygenation components were in the form of nitrogenous com pounds. These instances, among others,5,6 indicate the increased need and the like lihood of more stringent requirements on total oxygen demand removals. This will necessitate the development of effective ni trification processes incorporated into over all wastewater treatment. A detailed research program has demon strated the feasibility of using plastic media trickling filters in a stage treatment system to achieve high-level biological nitrifica tion. This paper describes the evaluation of controlling parameters, operational char acteristics, basic design guidelines, and economics for plastic media trickling filter nitrification. The studies by Barth 7 and Johnson 2 in dicate the effectiveness of the "stage" ap proach in obtaining predictable nitrification in laboratory units. This is generally agreed to be related to the relative differ ence in the rapid growth rate of the hetero trophic bacterial populations active in car bonaceous removal and the slower develop ment of the autotrophic nitrifying bacteria.
TL;DR: In this paper, the feasibility and advisability of the use of secondary filters applied before discharge of wastewater into the ground in the context of the fulfillment of the conditions of the current Regulation of the Minister of Environment of 18 November 2014 on the conditions to be met during the discharge of water or the ground and on substances particularly harmful to the aquatic environment.
Abstract: The aim of the article was to determine the feasibility and advisability of the use of secondary filters applied before discharge of wastewater into the ground in the context of the fulfillment of the conditions of the current Regulation of the Minister of Environment of 18 November 2014 on the conditions to be met during the discharge of wastewater into the water or the ground and on substances particularly harmful to the aquatic environment. Due to expected in practice, an application and popularity, as compared variants, reactors having a very simple construction were used. The average values of removal of BOD5, COD and total suspended solids for three secondary filters technologies: biological trickling filter with natural ventilation, sand filter and nonwoven filter were compared. Additionally, as a fourth option a simple mathematical model has been presented. This model allows to estimate of BOD5 at the outflow from biological trickling filter and to verify the empirical data. Despite a large usefulness, it is rarely used in our country. It has been found the possibility of reduction of the infiltration area (surface area after reduction is 38–63% of the initial value) due to the application of secondary filters. In the case of a high initial demand of the terrain area for drainage localization the benefit in costs resulting from the reduction (several thousand of PLN) or may even significantly exceed the cost of buying and installing a cheap secondary filter. In addition, reduction the occupied area of the lot (in extreme cases up to 100 m2) by using the secondary filter allows to use the unoccupied space for other purposes, and thus gives additional economic advantage.
Patent•
03 Aug 2016
TL;DR: In this paper, the authors proposed a composite biological bed purifying equipment for VOCs, consisting of a sealing body, a biological elution pool, and an exhaust port used for allowing gas to flow out.
Abstract: The invention relates to the technical field of exhaust gas purifying equipment, in particular to composite biological bed purifying equipment for VOCs The composite biological bed purifying equipment comprises a sealing body, the lower portion of the sealing body is provided with a biological elution pool, a biological trickling filter layer is arranged over the biological elution pool, a biological filter layer is arranged over the biological trickling filter layer, a gas inlet used for allowing exhaust gas to be treated to enter the equipment is formed between the biological elution pool and the biological trickling filter layer, an exhaust port used for allowing gas to flow out is formed above the biological filter layer, at least one trickling filter spray head is arranged over the biological trickling filter layer, at least one filter spray head is arranged over the biological filter layer, and the trickling filter spray heads and the filter spray heads are both communicated with the biological elution pool The composite biological bed purifying equipment is high in purifying efficiency, small in occupied area and easy and convenient to operate and maintain
TL;DR: In this article, the authors investigated influential hydraulic operational parameters on the process performance using a nitrification reactor at a municipal wastewater treatment plant in Da Nang, Vietnam and found that the reactive wetted surface area of the filter seemed to increase when high linear velocity of the fluid was applied, which resulted in an increase of volumetric biological reaction rates.
Abstract: Trickling filter process is focused on developing Asian countries in recent years as an alternative energy-saving wastewater treatment to conventional activated sludge systems. This paper investigated influential hydraulic operational parameters on the process performance using a nitrification reactor. The trickling filter process was expressed as 2-dimensional biofilm layers where the influent flowed to the bottom of the filter bed while oxygen was dissolved from the ambient air. The 4 m-height pilotscale trickling filter filled with tubular plastic media (1.5 cm × 1.5 cm, 371 m2/m3-reactor volume) was installed at a municipal wastewater treatment plant in Da Nang, Vietnam. During the 2-day hydraulic stress test, the nitrogen and hydraulic loadings were changed in a step-wise manner. Focusing on the nitrification which was a dominant oxygen uptake, the process performance was dynamically simulated with a modification of IWA Activated Sludge Model (International Water Association). The effluent concentrations of dissolved oxygen and inorganic soluble nitrogenous compounds were reasonably calculated under the hydraulic loading ranging between 2.4 and 18 m/h. The reactive wetted surface area of the filter seemed to increase when high linear velocity of the fluid was applied, which resulted in the increase of volumetric biological reaction rates.
TL;DR: In this paper, the authors presented the results of research about the possibility of using trickling filter for high ammonia concentration sewage treatment and used reject water generated during anaerobic sewage sludge stabilization in dairy wastewater treatment plant (WWTP).
Abstract: The article presents the results of research about the possibility of using trickling filter for high ammonia concentration sewage treatment. The study was conducted with the use of reject water generated during anaerobic sewage sludge stabilization in dairy wastewater treatment plant (WWTP. They are usually returned to the beginning of WWTP. The value of BOD in reject water was approximately the same as in domestic and municipal sewage. Ammonia nitrogen concentration was varied from 145,0 to 390,0 mgN-NH4 +/l and phosphorus from 16.0 to 38.0 mgP/l. The study used the Gunt test system CE701e, which allows controlling basic parameters of the treatment with trickling filter. Significant reduction of organic matter, total nitrogen and ammonium was observed during treatment. Average removal efficiency of ammonia nitrogen ranged from 73.6 to 80.3%. In the case of the Kjeldahl nitrogen removal efficiencies ranged from 74.4 to 79.8%. Because of the aerobic conditions during the treatment of phosphorus removal efficiency was low and varied from 32.0 to 33.7%. The research confirmed the efficiency of trickling filter for treatment sewage with high concentration of ammonia nitrogen.
Patent•
11 May 2016
TL;DR: In this paper, a flue gas desulfurization and denitrification method is proposed to remove smoke dust, sulfur dioxide and other easily-soluble impurities, and feed the purified flue gases into a biological filter to carry out further treatment for controlling contents of sulfur dioxide.
Abstract: The invention provides a flue gas desulfurization and denitrification method. The method includes: using manganese ore slurry for absorbing discharged flue gas to remove smoke dust, sulfur dioxide and other easily-soluble impurities, and feeding the purified flue gas into a biological filter to carry out further treatment for controlling contents of sulfur dioxide and nitrogen oxides in the treated flue gas to be lower than emission standards. According to the method, dedusting, desulfurization and denitrification of the flue gas are completed in one system by feeding the flue gas into a manganese ore slurry containing bubble tower to realize desulfurization, purification and dedusting and then feeding tail gas into a biological trickling filter for denitrification. The flue gas desulfurization and denitrification method has the advantages that by adoption of the manganese ore slurry for pretreatment of the flue gas, water-soluble matters are removed, and quality control of the gas fed into the biological filter is realized to minimize influences of impurities in the gas on a biological reaction system; in addition, the gas humidified and cooled through manganese ore slurry reaction can be directly fed into the biological trickling filter, so that cost control and simplification of biological filter operation steps are realized.
01 Jan 2016
TL;DR: A trickling filter (TF) is one of the oldest biological wastewater technologies that has been used for over 100 years as discussed by the authors and can be built up to 12 m (40 ft) tall with the use of high-performance plastic media.
Abstract: A trickling filter (TF) is one of the oldest biological wastewater technologies that has been used for over 100 years. With years of evolution, modern trickling filters can be built up to 12 m (40 ft) tall with the use of high-performance plastic media. Modern flow distribution and ventilation systems can also be incorporated to improve TF performance. The treatment capacity of modern filters has been significantly increased in comparison with that of old rock filters. The application of trickling filter technologies has also been greatly expanded from early BOD roughing to incorporate complete carbon oxidizing and nitrification. In many cases, trickling filters are designed in “stages” to achieve different treatment levels.
Patent•
21 Dec 2016
TL;DR: In this article, a take-rotation spray device's bio-trickling filter is described, and a utility model is provided to demonstrate the applicability of this filter.
Abstract: The utility model discloses a take rotation spray device's bio -trickling filter, it includes bio -trickling filter body (14), installs filler (10) in bio -trickling filter body (14), install respectively in rotation spray device (11) and the backward flow pond (7) of bio -trickling filter body (14) upper portion and bottom, with consecutive mixed dashpot (5), evaporation tank (4) in backward flow pond (7) one side, and air compressor (1), with backward flow pond (7) continuous nutrition liquid bath (8) of opposite side, with hydraulic pump (9) that nutrition liquid bath (8) links to each other, hydraulic pump (9) link to each other with rotation spray device (11). The utility model provides a take rotation spray device's bio -trickling filter, structural design is reasonable, and convenient operation can evenly spray, the convenient scope of spraying of adjusting, the practicality is strong, and the range of application is extensive.
Patent•
04 May 2016
TL;DR: In this article, a modified filling for a waste gas bio-trickling filter and a preparation method of the modified filling are presented, which are particularly applicable to bio trickerling filter devices, and the absorption effect of the obtained modified filling to degrading bacteria is good.
Abstract: The invention discloses a modified filling for a waste gas bio-trickling filter and a preparation method of the modified filling. The preparation method comprises the steps of after washing ceramic particles with the particle sizes of 5mm-100mm with water, steeping the ceramic particles in hydrochloric acid, taking out the ceramic particles, washing the ceramic particles with water, steeping the ceramic particles in an NaOH solution, taking out the ceramic particles, washing the ceramic particles to be neutral with water, drying, steeping with a modifier, draining off, and drying, so as to obtain the modified filling for the waste gas bio-trickling filter. The modified filling for the waste gas bio-trickling filter and the preparation method are particularly applicable to bio-trickling filter devices, the absorption effect of the obtained modified filling to degrading bacteria is good, the waste gas treatment efficiency of the bio-trickling filter can be effectively improved, meanwhile, the raw material cost is low, the processing process is simple, and the market application prospect is wide.
Patent•
07 Dec 2016
TL;DR: In this paper, a solar rural domestic sewage trickling filtration system and a use method thereof is described. And the system comprises a grid adjusting tank, a trickling filter and a constructed wetland, and collected domestic domestic sewage is purified step by step.
Abstract: The invention discloses a solar rural domestic sewage trickling filtration system and a use method thereof. The system comprises a grid adjusting tank, a trickling filter and a constructed wetland, and collected rural domestic sewage is purified step by step. Compared with the prior art, the system has the advantages that a storage battery supplies energy by the aid of a solar panel, energy sources are saved, running cost is reduced, the structure is simple, pumice stone fillers are arranged in the trickling filter, COD (chemical oxygen demand), ammonia nitrogen and total nitrogen and total phosphorus removal rate is high, water treatment effects are good, oxygen is supplied for the trickling filter by natural ventilation, an aerator is omitted, investment cost is reduced, enhanced phosphorus removal can be realized by modified limestone ceramsites in a constructed wetland treatment area, nitrogen and phosphorus adsorption effects are remarkable, and the whole project is simple in structure, convenient in construction, stable in running and low in running cost.