Document Detail

Overview: full scale experience of the SHARON process for treatment of rejection water of digested sludge dewatering.
MedLine Citation:
PMID:  11496665     Owner:  NLM     Status:  MEDLINE    
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.
R van Kempen; J W Mulder; C A Uijterlinde; M C Loosdrecht
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Water science and technology : a journal of the International Association on Water Pollution Research     Volume:  44     ISSN:  0273-1223     ISO Abbreviation:  Water Sci. Technol.     Publication Date:  2001  
Date Detail:
Created Date:  2001-08-10     Completed Date:  2001-12-07     Revised Date:  2006-04-19    
Medline Journal Info:
Nlm Unique ID:  9879497     Medline TA:  Water Sci Technol     Country:  England    
Other Details:
Languages:  eng     Pagination:  145-52     Citation Subset:  IM    
Grontmij Water & Waste Management, P.O. Box 14, 3730 AA, De Bilt, The Netherlands.
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MeSH Terms
Ammonia / analysis
Carbon Dioxide / analysis
Environmental Monitoring
Hydrogen-Ion Concentration
Nitrogen / analysis,  chemistry*
Water Pollution / prevention & control
Water Purification / methods*
Reg. No./Substance:
0/Sewage; 124-38-9/Carbon Dioxide; 7664-41-7/Ammonia; 7727-37-9/Nitrogen

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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