Showing papers on "Trickling filter published in 2002"

Biological waste water treatment system

Abstract: The present invention relates to a compact, environmentally benign onsite waste water treatment and disposal system installed secondary to conventional primary treatment process. It is a method and apparatus for the biological purification and natural disposal of liquid wastes using a secondary single pass trickling filter in conjunction with an evapotranspiration absorption (ETA) tertiary disposal bed.

The Composting of Brewery Sludge

Abstract: Sludge produced from a trickling filter effluent treatment plant dedicated to the treatment of brewery wastewater was flocculated with cationic polyelectrolytes and dewatered by centrifugation to produce a cake of around 16% (w/w) solids. This cake was mixed with spent grains, shredded office paper and straw to produce an initial mix of 34% (w/w) dried solids with a carbon: nitrogen ratio of 21:1. Temperatures of over 45°C were achieved for around 9 days in a purpose built, laboratory scale, composting unit equipped with temperature and aeration control. Dried solids (DS) were increased to about 65% (w/w) and the volatile solid fraction was reduced from 80% to 60% (w/w) of DS by microbial degradation. The compost was rich in nitrate and phosphate and was used as a peat substitute in qualitative, comparative growth trials where geranium and tomato plants were successfully grown.

Effect of Biotrickling Filter Operating Parameters on Chlorobenzenes Degradation

Abstract: In this paper the effect of operating parameters on biotrickling filter performance degrading chlorobenzene and o-dichlorobenzene mixture were studied. The large laboratory scale biofilter, total volume 40 L, filled with inert packing material was used. The biomass adaptation and cultivation were performed in a batch fermentor and were used to inoculate the biotrickling filter. After a starting period, the influence of the substrate load increase, liquid recirculation flow rate, and empty bed retention time on elimination capacity and removal efficiency were found. The most important recirculation liquid parameters were analyzed every day, that is: concentration of metabolites, dissolved organic carbon, nitrate, chloride, and biomass. A good correlation was found between intermediate concentration and the removal efficiency of the biotrickling filter. The measurements of the absorbance, very easy and rapid, can be used as a control parameter of the biofiltration efficiency.

Monitoring and modelling a pilot-scale trickling filter using on-line off-gas analysis

Abstract: The process characteristics of a pilot-scale trickling filter system were quantified by means of a measurement campaign with the use of off-gas analysis. A load shift experiment was conducted in which the influent load to the trickling filter system was suddenly decreased. To model the biodegradation in the filters, the model developed by Rauch et al. (1999) was used. This model was extended with equations for the production and the pH-dependent liquid phase equilibrium for inorganic carbon (IC).

Hydraulic distribution effect on a real-scale trickling filter

Abstract: In this work, the influence of several operational parameters on the efficiency of a real-scale trickling filter placed in an urban wastewater treatment plant in Mexico, is discussed. Special attention is placed on the parameters that influence the biofilm hydraulics such as the instantaneous dosing intensity (SK) and the radial distribution of the superficial hydraulic load. The low speed of the distribution arms forced an instantaneous dosing intensity of 150 mm/pass, resulting in a short liquid retention time of 32 s, which was the reason why a poor COD removal efficiency was obtained. The average removal is 36%, although the daily efficiencies increase with increasing inlet COD concentrations. However, the high shear forces of the water provides a constant and homogenous biofilm detachment, avoiding filter clogging because of the solids. Finally, a slight decrease in the theoretical efficiency has been found due to a nonuniform radial distribution of flow, because the real superficial load is too high...

Water Quality Impacts of Three Biofilter Designs in Recirculating Aquaculture Systems

Abstract: Nine recirculating aquaculture systems utilizing three biofilter types were placed on line and stocked with yellow perch, Percaflavescens, fingerlings. Biofilter type differed among systems, and included upflow pulsed bed bead filter, packed tower trickling filter, and rotating biological contactor. Following filter acclimation, a comparative analysis of biofilter performance was conducted, involving measurement of temperature, pH, dissolved oxygen, total ammonia-nitrogen, nitrite­ nitrogen, nitrate-nitrogen, alkalinity, total hardness, carbonaceous biochemical oxygen demand, dissolved organic carbon, and total suspended solids. Filter bed emergence promoted effective carbon dioxide stripping, pH maintenance, and consistent nitrification performance in trickling filters and rotating biological contactors. Higher total ammonia nitrogen mass removal rates were observed in trickling and rotating biological contactor filters than in bead filters. Low total ammonia nitrogen mass removal rates and nitrification efficiencies for all filters resulted from relatively high carbonaceous biological oxygen demand loadings. Analysis of areas under mass removal curves showed that RBC filters were surface area limited. Foam formation in trickling filters effectively removed total suspended solids from the culture water. Filter type did not have a significant effect on median

Method of anaerobic activated sludge contact treatment of sewage and organic wastewater

Abstract: Provided step-by-step scheme for conversion of conventional STP to mainly anaerobic treatment of raw sewage without major facility modification. Part of sludge from conventional anaerobic digester is mired into raw sewage at the entrance of STP, flows through feeding pumps and pipes, spiral sand trap, and settles in clarifier together with primary sludge. Adsorbed dissolved/colloidal organic molecules is digested i n staged anaerobic digester at favorable temperature. Clarified effluent is polished in aerobic trickling filter, and washed out aerobic biomass is settled in secondary clarifier and anaerobically stabilized in separate digester.

/Sewage/waste water treating system

Abstract: PURPOSE: A sewage/wastewater treatment system is provided, which is characterized in that settling tank is installed under conventional trickling filter unit to feed settled sludge again into trickling filter unit, thus extending sludge age. CONSTITUTION: The sewage/wastewater treatment system comprises a wastewater injector(20); a bio-reactor(12) for allowing wastewater to react with microorganism; a fan(16) for supplying air into the bio-reactor; a settling tank(11) for separating sludge; a sludge scraper(15) for collecting settled sludge; and a sludge pump(21) for transferring sludge together with wastewater.

Desempenho de um reator uasb utilizado para tratamento de esgotos e digestão de lodo aeróbio produzido em um filtro biológico percolador

Abstract: This work aimed at evaluating the influence of return sludge produced in a trickling filter (TF) on the performance of an UASB reactor used for the combined treatment of domestic sewage and aerobic sludge. During phase 1 of the research, the UASB reactor/TF system was fed with domestic sewage pumped directly from the interceptor of Arrudas stream, in Belo Horizonte City Brazil. During phase 2, besides feeding the reactor with domestic sewage, the UASB reactor was also fed with the excess aerobic sludge produced in the trickling filter. The UASB reactor, with a volume of 420 litres, was operated with a mean hydraulic retention time of 5.6 hours in both operational phases. After 133 days of continuous monitoring, it was not observed any detrimental effect on the performance of the UASB reactor related to the return of the aerobic sludge produced in the TF. On the contrary, the COD results indicated a higher percentage of compliance with the discharge standards set by the Brazilian environmental legislation. During phase 2, when the UASB reactor was used for combined treatment of domestic sewage and return aerobic sludge from the TF, the anaerobic effluent presented mean concentrations of 18 mgTSS.L, 57 mgBOD.L and 108 mgCOD.L.