8 Attached Growth Biological Treatment Processes 8-1 Background Nonsubmerged attached growth processes A trickling filter is a nonsubmerged fixed-film biological reactor using rock or plastic packing over which wastewater is distributed continously
8 Attached Growth Biological Treatment Processes 8-1 Background Nonsubmerged Attached Growth Processes A trickling filter is a nonsubmerged fixed-film biological reactor using rock or plastic packing over which wastewater is distributed continously
The limitations of the trickling filter included a relatively high incidence of clogging, the long rest period required headloss, and the relatively low loading that could be used
The limitations of the trickling filter included a relatively high incidence of clogging, the long rest period required, headloss, and the relatively low loading that could be used
In the 1950s, plastic packing began to replace rock, which allowed the use of higher loading rates and taller filters(also known as biotowers)with less land area improved process efficiency, and reduced clogging In the 1960s, practical designs were developed for rotating biological contactors (RBCS), where the packing is rotated in the wastewater treatment tank Both trickling filters and rBCs have been used as aerobic attached growth processes for BOd removal only, combined BOD removal and nitrification
In the 1950s, plastic packing began to replace rock,which allowed the use of higher loading rates and taller filters (also known as biotowers) with less land area, improved process efficiency, and reduced clogging. In the 1960s, practical designs were developed for rotating biological contactors (RBCs), where the packing is rotated in the wastewater treatment tank. Both trickling filters and RBCs have been used as aerobic attached growth processes for BOD removal only, combined BOD removal and nitrification
In comparison to the activated-sludge process, disadvantages encountered for trickling filters are a poorer effluent quality in terms of BOD and TSS concentrations, greater sensitivity to lower temperatures, odor production, and uncontrolled solids sloughing events Trickling filters and rBCs have also been used in combined processes with activated sludge to utilize the benefits of both processes, in terms of energy savings and effluent quality
In comparison to the activated-sludge process, disadvantages encountered for trickling filters are a poorer effluent quality in terms of BOD and TSS concentrations, greater sensitivity to lower temperatures, odor production, and uncontrolled solids sloughing events. Trickling filters and RBCs have also been used in combined processes with activated sludge to utilize the benefits of both processes, in terms of energy savings and effluent quality
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