Trickling filter

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

Carbon filtration process and apparatus for removing PCB's and other compounds from wastewater

Abstract: Process and apparatus for treating wastewater from a sewer system including the steps of: (A) removing solids contained in the influent to create solids-depleted preliminary effluent (PrE) and to protect downstream systems from premature failure due to wear from solid particles; (B) removing suspended solids from the PrE to produce a suspended solids-depleted primary effluent (PE); (C) treating the PE biologically by exposing it to bacteria-supporting media that removes soluble organic material, thereby creating trickling filter effluent (TFE); (D) separating the bacterial organisms by settling to create a secondary effluent (SE); (E) subjecting the SE to tertiary treatment including granular activated carbon pressure filters to remove PCB's and other compounds and create a carbon filter effluent; (F) disinfecting the CFE to create a final effluent (FE); and (G) discharging the FE to a receiving environment, separately settling and disposing the backwash solids in a backwash clarifier.

Evaluation of the spatial and temporal variability of nitrous oxide (N2O) emissions at two different full-scale aerobic treatment systems used in the post-treatment of UASB effluents in Brazil

Abstract: Monitoring of nitrous oxide (N2O) emissions from wastewater treatment plants (WWTP) correlated to different operational conditions plays an important role in proposing mitigation strategies. However, few full-scale studies are available so far correlating N2O emission factors (EF) from wastewater treatment systems to different structural, operational and environmental configurations. In this context, the aim of this study was to evaluate the variability of N2O emissions from two aerobic treatment systems, activated sludge (AS) and low-rate trickling filter (TF), operated as post-treatments in upflow anaerobic sludge blanket reactors (UASB), under different operational conditions: (1) employed aeration system, (2) biomass growth and (3) environmental conditions, with a main focus on the generation of N2O EFs for these types of systems. Both studied systems displayed high temporal variability in N2O emissions associated with different operational and environmental conditions, such as: (1) aeration intermittency and high amplitudes of influent N loads for the AS system, (2) recirculation of treated wastewater and different wastewater temperatures for the TF system. In addition, the temporal variability of methane (CH4) emissions was also significant, with greater amplitudes for the AS system, due to the greater air-stripping effect intensified by the combination of intermittency and excess aeration. Finally, regardless of the employed operational condition, the average EFs (N2O and CH4) determined for the WWTP-1 aeration tank (AT) (0.04 % and 0.054 %) and WWTP-2 TF (0.005 % and 0.015 %) were substantially lower than the N2O and CH4 EFs (1.6 % and 0.75 %) suggested by the IPCC, for centralized WWTPs with aerobic systems.

Techno-Economic Assessment Of Biological Treatment And Water Reuse Of Effluent From The Food Industries

Abstract: Treatment of high strength wastewater generated by food plants requires a development of cost effective wastewater treatment schemes and exploration of viable means for treated water reuse. This paper addresses the techno-economic aspects of a combined biological treatment scheme comprising anaerobic digestion and aerobic biological filters. Advanced water treatment for reuse includes multimedia filtration, activated carbon adsorption and membrane separation. Analysis of the results of the combined performance of the anaerobic/aerobic treatment indicates that treating high strength wastewater could be achieved by an upflow anaerobic sludge blanket (UASB) reactor and high rate trickling filter. Typical biological treatment capital and operating costs are about 1.3 million dollars and 131,000 dollars, respectively, for a treatment facility of about 4000 v m 3 /day to produce effluents of COD about 30 v mg/l. Water reuse costs ranged from US$ 0.034 to US$ 0.38/m 3 based on the salt content and residual disso...

The Hydrodynamic Evaluation of a Fixed Media Biological Process

Abstract: : TWo basic classifications of flow models for biological processes are presently accepted, plug or piston flow and complete mixing. The trickling filter can be modelled as a plug flow system and the activated sludge process can be designed as a complete mixed system. If a trickling filter and a complete mixed activated sludge system are combined together in a tank, then an interesting question arises on how the mixing characteristics will be changed. A hydrodynamic evaluation was made to characterize the flow patterns and the mean detention time changes inherent to such a system. Tracer analyses were used during the course of the development of a fixed media process which utilized plastic tower packing, but unlike a trickling filter system, the packing was completely submerged. A surface aerator supplied oxygen to the system and provided mixing in the system by pumping action through a draft tube.