Trickling filter

About: Trickling filter is a research topic. Over the lifetime, 1098 publications have been published within this topic receiving 20219 citations.

Municipal and Industrial Wastewater Treatment Using Plastic Trickling Filters for BOD and Nutrient Removal

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.

Multistage suspension type stepped trickling filter bed

Abstract: The utility model discloses a multistage suspension type stepped trickling filter bed which comprises a shell, a water inlet tube, a water outlet, a water collecting tank, more than one frame filter material bearing bed, a bearing frame and a shower nozzle, wherein the water collecting tank is arranged at the bottom of the shell, the water outlet is arranged on the water collecting tank, the water inlet tube is connected with the shower nozzle, the shower nozzle is arranged above the frame filter material bearing bed, the water inlet tube is communicated with a sewage pond through a pump, the bearing frame is installed and fixed in the shell, the frame filter material bearing bed is placed on the bearing frame, the bottom of the frame filter material bearing bed is hopper-shaped, and the frame filter material bearing bed is filled with filler. The device is mainly applicable to treatment of high-concentration organic wastewater such as livestock breeding wastewater, landfill leachate and coking wastewater. The removal rates of COD (Chemical Oxygen Demand) Cr, BOD (Biochemical Oxygen Demand) 5, TOC (Total Organic Carbon), and NH3-N of water treated by the device can respectively reach 93-95%, 91-98%, 88-97%, 93-98% and 86-93%.

Partial-nitrification-and-anaerobic-ammonia-oxidation-combined denitrification method and device for synchronously treating urban sewage and mature landfill leachate

Abstract: The invention discloses a partial-nitrification-and-anaerobic-ammonia-oxidation-combined denitrification method and device for synchronously treating urban sewage and mature landfill leachate. The device comprises a raw urban sewage tank, a raw mature landfill leachate tank, a middle water tank, a denitrification half partial nitrification reactor, a secondary sedimentation tank and a closed anaerobic-ammonia-oxidation biological trickling filter reactor. The secondary sedimentation tank is provided with a water outlet pipe, a returned sludge pipe and a left sludge pipe. The method includes the steps that the urban sewage and the mature landfill leachate are mixed in proportion to enter the middle water tank and then enter an anoxic region of the denitrification half partial nitrification reactor to be subjected to denitrification, and returned nitrate nitrogen is removed through organisms in the sewage; then the mixture enters an aerobic region to be subjected to half partial nitrification; then the mixture enters the closed anaerobic-ammonia-oxidation biological trickling filter reactor to be subjected to an anaerobic ammonia oxidation reaction. According to the method and device, combined treatment is carried out on the sewage generated by mixing the urban sewage and the mature landfill leachate through the partial-nitrification-and-anaerobic-ammonia-oxidation-combined technology, the joint denitrification aim is achieved, and the method and device are economical and easy to execute.

Life cycle assessment and cost-benefit analysis of internal-stack trickling bio-electrochemical reactor: an evaluation for commercial viability.

Abstract: The present study reports a detailed life cycle assessment and cost-benefit analysis of a commercially viable Internal-Stack-Trickling Bio-Electrochemical Reactor (IS-TrickBER). IS-TrickBER used wastewater as a feedstock and converted that wastewater through electrochemical methods into low-grade fertilizer and produced electricity. IS-TrickBER was observed for its performance in terms of power output and wastewater treatment. IS-TrickBER exhibited up to 4.2 Wh net energy yield while treating 84.84L wastewater per day along with 92.17% COD removal and 38.23% Columbic efficiency during the operational run with real municipal wastewater. Based on daily net energy yield, up to 1457.6Wh yearly net energy yield can be expected. A comprehensive start-to-end life cycle assessment study associated with the manufacturing, and operational phases of IS-TrickBER was also conducted to ascertain its impact on the environment. The environmental impact through air emissions during the manufacturing stage can be minimized by changing the plastic balls used as packing material in the reactor. A detailed cost-benefit analysis was also conducted to understand its economic viability. Cost-benefit analysis of IS-TrickBER, based on net energy yield, shows that IS-TrickBER could compensate its installation cost within a few years. IS-TrickBER performed well in eliminating the chemical load of wastewater and simultaneous electricity generation. Due to its scalability, compactness, and low maintenance, IS-TrickBER can be a suitable candidate in real-time wastewater treatment.

Development of Simple and Cost-effective Treatment System for Municipal Wastewater

Abstract: This study developed an alternative municipal sewage treatment system based on the pilot- and full-scale experiments. This proposed system consisting of upflow anaerobic sludge blanket (UASB) and trickling filter using a polyurethane sponge as packing material. This aerobic process was originally developed and named as a down-flow hanging sponge (DHS). DHS reactors accomplished high process performance during pilot- and full-scale experiments in Japan and other countries. The effluent quality of the DHS reactors was comparable to that of activated sludge systems. Moreover, advantages of DHS reactors include simple operation and maintenance (O&M), no required oxygen supply, small land requirement, and less excess sludge production. Indeed, the estimated energy requirement and excess sludge production of UASB and DHS systems were found to be approximately 75 and 85 % lower than those of conventional activated sludge systems, respectively. The high process performance can be attributed to the fact that the DHS reactor maintains much of the sludge in the reactor at concentrations 5–10 times higher than activated sludge. This indicates that DHS reactors have the potential for use as reliable, affordable, and efficient treatment systems, and can be used widely including developing countries.