Fine mesh sieve technologies were tested in full scale at several municipal wastewater treatment plants. A screening test was used to characterize wastewater and establish the design criteria for the sieves. To achieve high removal efficiencies it was crucial to operate the sieves with a filter mat. Rotating belt sieves performed best in the full-scale tests. A small dose of cationic polymer and a static flocculator ahead of a rotating belt sieve achieved excellent results on a wastewater that was originally found unsuitable for primary treatment with fine mesh sieves. Simple screw presses dewatered the sludge from the sieves to typically 25–30% total solids. Using fine mesh sieves with <500 microns openings was found to normally be the most economical process for primary treatment.
Evaluation and testing of fine mesh sieve technologies for primary treatment of municipal wastewater
B. Rusten, H. Ødegaard; Evaluation and testing of fine mesh sieve technologies for primary treatment of municipal wastewater. Water Sci Technol 1 November 2006; 54 (10): 31–38. doi: https://doi.org/10.2166/wst.2006.710
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