Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Activated Sludge Quality and Process Balance.
Author West, A. W. ;
CORP Author Environmental Protection Agency, Washington, DC. Office of Water.
Publisher 1995
Year Published 1995
Stock Number PB95-158002
Additional Subjects Sewage sludge ; Activated sludge process ; Process control ; Flow control ; Performance standards ; Performance evaluation ; Flow rate ; Flow measurement ; Clarifiers ; Chemical removal(Sewage treatment) ; Organic loadings ; DSA(Dynamic Sludge Age) ; BLT(Sludge Blanket Thickness) ; CSP(Clarifier Sludge Flow Percentage)
Library Call Number Additional Info Location Last
NTIS  PB95-158002 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 05/26/1995
Collation 18p
The paper discusses two relatively new concepts to help operators diagnose problems and effectively control the activated sludge process performance. The trend chart display of Dynamic Sludge Age (DSA) values helps operators visualize how and why the sludge wasting program is affecting mixed liquor sludge quality. Accordingly, it helps determine the day-to-day wasting adjustments needed to restore or maintain good sludge quality. The calculated final clarifier Sludge Blanket Thickness (BLT) versus Clarifier Sludge Flow Percentage (CSP) curve shows the approximate trend of blanket thickness responses to clarifier sludge flow control. The information developed from these two concepts can help determine the proper sludge wasting and the return sludge flow rates needed to meet the interrelated requirements of the variable sewage flows, organic loadings, and sludge quality characteristics.