Peer-Reviewed Journal Details
Mandatory Fields
O'Reilly, E,Rodgers, M,Zhan, XM
Water Science And Technology
Pumped flow biofilm reactors (PFBR) for treating municipal wastewater
Optional Fields
COD removal nitrogen removal pumped flow sequencing batch biofilm reactor small-scale wastewater treatment plants
A novel laboratory bench-scale sequencing batch biofilm reactor ( SBBR) system was developed for the treatment of synthetic domestic strength wastewater, comprising two side-by-side 18 l reactor tanks, each containing a plastic biofilm media module. Aerobic and anoxic conditions in the biofilms were effected by intermittent alternate pumping of wastewater between the two reactors. With a media surface area loading rate of 4.2 g chemical oxygen demand ( COD)/m(2). d, the average influent COD, total nitrogen ( TN) and ammonium- nitrogen ( NH4- N) concentrations of 1021 mg/l, 97 mg/l and 54 mg/l, respectively, reduced to average effluent concentrations of 72mg COD/l, 17.8mg TN/l, and 5.5mg NH4- N/l. Using a similar alternating biofilm exposure arrangement, a 16 person equivalent pilot ( PE) plant was constructed at a local village treatment works to remove organic carbon from highly variable settled municipal wastewater and comprised two reactors, one positioned above the other, each containing a module of cross-flow plastic media with a surface area of 100m(2). Two different pumping sequences ( PS) in the aerobic phase were examined where the average influent COD concentrations were 220 and 237 mg/l for PS1 and PS2, respectively, and the final average effluent COD was consistently less than 125 mg/l - the European Urban Wastewater Treatment Directive limit - with the best performance occurring in PS1. Nitrification was evident during both PS1 and PS2 studies. A 300 PE package treatment plant was designed based on the bench-scale and pilot-scale studies, located at a local wastewater treatment works and treated municipal influent with average COD, suspended solids ( SS) and TN concentrations of 295, 183 and 15 mg/l, respectively resulting in average effluent concentrations of 67mgCOD/ l, 17mg SS/ l and 9mg TN/l. The SBBR systems performed well, and were simple to construct and operate.
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