Peer-Reviewed Journal Details
Mandatory Fields
Rodgers, M,Zhan, XM,Prendergast, J
Process Biochemistry
Wastewater treatment using a vertically moving biofilm system followed by a sand filter
Optional Fields
small-scale wastewater treatment sequencing batch biofilm reactor vertically moving biofilm reactor (VMBR) sand filter BIOLOGICAL PHOSPHORUS REMOVAL NUTRIENT REMOVAL REACTOR SBBR
The design and operation of wastewater treatment systems for single houses, farms, hotels, leisure centres, small communities and small businesses are a challenge to wastewater engineers. In this paper, a pilot-scale system comprising a vertically moving biofilm reactor (VMBR) followed by a stratified sand filter was constructed and its performance was evaluated. The vertically moving biofilm reactor was operated as a sequencing batch biofilm reactor (VMSBBR). The results show that the VMSBBR unit efficiently removed 94.8% of the filtered chemical oxygen demand (CODf) from a synthetic wastewater with the influent CODf of 1096 +/- 425 mg/l, leaving 45 +/- 16 mg/l CODf in the effluent, at an organic loading rate of 0.9 kg COD/m(3) day. After the system had been operated for 133 days, the removal efficiency of orthophosphate (PO4-P) reached 90%. A sand filter polished the effluent from the VMSBBR unit and reduced suspended solids (SS) to 4.4 mg/l and total bacterial by 3 log 10 units. The advantages of the treatment system studied for small wastewater flows include: (1) simple operation and maintenance-sludge was only disposed of once on Day 206 during the 7.5-month study period; clogging, which often happens in other attached-growth biofilm systems, did not take place; (2) efficient removal of COD and phosphorus; and (3) low-energy consumption-the electricity consumption was 4.6 kWH/population equivalent (p.e.) year, or 0.6 kWh/m(3) wastewater treated or 0.6 kWh/kg COD removed. (c) 2005 Elsevier Ltd. All rights reserved.
DOI 10.1016/j.procbio.2005.03.024
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