Overview: full scale experience of the SHARON process for treatment of rejection water of digested sludge dewatering

A SHARON system has been constructed at the Utrecht WWTP and at the Rotterdam Dokhaven WWTP. In the SHARON process rejection water from dewatering of digested sludge is treated for N-removal. It concerns a high active process operating without sludge retention. Due to differences in growth rate nitr...

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Bibliographic Details
Published in:Water science and technology 2001-01, Vol.44 (1), p.145-152
Main Authors: van Kempen, R, Mulder, J W, Uijterlinde, C A, Loosdrecht, M C
Format: Article
Language:English
Subjects:
Acidification
Aeration
Ammonia
Ammonia - analysis
Ammonium
Ammonium compounds
Carbon dioxide
Carbon Dioxide - analysis
Denitrification
Dewatering
Environmental Monitoring
Growth rate
Hydrogen-Ion Concentration
Influents
Inlets (waterways)
Nitrification
Nitrites
Nitrogen - analysis
Nitrogen - chemistry
Operating temperature
pH control
Rejection
Removal
Sewage
Sludge
Sludge digestion
Sludge drying
Wastewater treatment plants
Water Pollution - prevention & control
Water Purification - methods
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Summary:A SHARON system has been constructed at the Utrecht WWTP and at the Rotterdam Dokhaven WWTP. In the SHARON process rejection water from dewatering of digested sludge is treated for N-removal. It concerns a high active process operating without sludge retention. Due to differences in growth rate nitrite oxidisers can be washed out of the system while ammonia oxidisers are maintained, resulting in N-removal over nitrite. The SHARON process was selected in competition with several other techniques. The feed of a SHARON system is concentrated, with ammonia concentrations ranging from 0.5 to 1.5 g N/l. The results show that conversion rates of 90% are well possible with N-removal mainly via the nitrite route. The process was shown to be stable. Due to the high ammonium influent concentrations pH control is of great importance, preventing process inhibitions. The acidifying effect of nitrification can be compensated completely by CO2 stripping during aeration and by denitrification. Heat production by biological conversions is significant, due to the high inlet concentrations, and contributes to the optimal operating temperature of 30-40 degrees C.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2001.0035