Performance Evaluation of a Cloth-Media Disk Filter for Wastewater Reclamation
A cloth-media disk filter (CMDF) was evaluated as an alternative to granular-medium filtration for use in wastewater recycling applications. The CMDF was effective for filtration of effluent from an activated-sludge treatment process. Effluent turbidity values from the CMDF were consistently less than California's wastewater recycling application limit of 2 nephelometric turbidity units (NTU) for influent turbidity values of up to 25 NTU at hydraulic loading rates varying between 7 and 15 m/h (2.86 and 6.1 gpm/sq ft). The filter produced 154 m/d (3781 gpd/sq ft) at a hydraulic loading rate of 7 m/h (2.86 gpm/sq ft) with high turbidity (6 to 25 NTU) and 330 m/d (8102 gpd/sq ft) at a hydraulic loading rate of 15 m/h (6.1 gpm/sq ft) with low influent turbidity (≤6 NTU/m2 [6 NTU/sq ft] of filter cloth). The backwash water required by the CMDF at HLRs between 7 and 15 m/h (2.86 and 6.1 gpm/sq ft) and corresponding solids loading rates between 5 and 32 kg/(m2·d) (0.21 and 1.35 lb/d/sq ft) varied from 2 to 10% of the total influent flow. Thus, the CMDF could consistently meet the recycling requirements of a turbidity less than 2 NTU over a broad range of influent turbidity values and hydraulic loading rates.
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Document Type: Research Article
Publication date: 2003-11-01
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Water Environment Research (WER) publishes peer-reviewed research papers, research notes, state-of-the-art and critical reviews on original, fundamental and applied research in all scientific and technical areas related to water quality, pollution control, and management. An annual Literature Review provides a review of published books and articles on water quality topics from the previous year. Published as: Sewage Works Journal, 1928 - 1949; Sewage and Industrial Wastes, 1950 - 1959; Journal Water Pollution Control Federation, 1959 - Oct 1989; Research Journal Water Pollution Control Federation, Nov 1989 - 1991; Water Environment Research, 1992 - present.
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