Fine mesh rotating belt sieves (RBS) offer a very compact solution for removal of particles from wastewater. This paper shows examples from pilot-scale testing of primary treatment, chemically enhanced primary treatment (CEPT) and secondary solids separation of biofilm solids from moving bed biofilm reactors (MBBRs). Primary treatment using a 350 microns belt showed more than 40% removal of total suspended solids (TSS) and 30% removal of chemical oxygen demand (COD) at sieve rates as high as 160 m³/m²-h. Maximum sieve rate tested was 288 m³/m²-h and maximum particle load was 80 kg TSS/m²-h. When the filter mat on the belt increased from 10 to 55 g TSS/m², the removal efficiency for TSS increased from about 35 to 60%. CEPT is a simple and effective way of increasing the removal efficiency of RBS. Adding about 1 mg/L of cationic polymer and about 2 min of flocculation time, the removal of TSS typically increased from 40–50% without polymer to 60–70% with polymer. Using coagulation and flocculation ahead of the RBS, separation of biofilm solids was successful. Removal efficiencies of 90% TSS, 83% total P and 84% total COD were achieved with a 90 microns belt at a sieve rate of 41 m³/m²-h.
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Research Article|
March 06 2017
Rotating belt sieves for primary treatment, chemically enhanced primary treatment and secondary solids separation
B. Rusten;
1Aquateam COWI, P.O. Box 6731, Etterstad, 0609 Oslo, Norway
E-mail: [email protected]
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S. S. Rathnaweera;
S. S. Rathnaweera
1Aquateam COWI, P.O. Box 6731, Etterstad, 0609 Oslo, Norway
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E. Rismyhr;
E. Rismyhr
2Nedre Romerike Avløpsselskap IKS, P.O. Box 26, 2011 Strømmen, Norway
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A. K. Sahu;
A. K. Sahu
1Aquateam COWI, P.O. Box 6731, Etterstad, 0609 Oslo, Norway
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J. Ntiako
J. Ntiako
3Faculty of Science and Technology, University of Stavanger, 4036 Stavanger, Norway
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Water Sci Technol (2017) 75 (11): 2598–2606.
Article history
Received:
July 26 2016
Accepted:
February 20 2017
Citation
B. Rusten, S. S. Rathnaweera, E. Rismyhr, A. K. Sahu, J. Ntiako; Rotating belt sieves for primary treatment, chemically enhanced primary treatment and secondary solids separation. Water Sci Technol 15 June 2017; 75 (11): 2598–2606. doi: https://doi.org/10.2166/wst.2017.145
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