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Estimation of the Unbiodegradable Fraction of Thickened Waste Activated Sludge
Author(s) -
Chowdhury Mohammad M. I.,
Nakhla George,
Zhu J.
Publication year - 2018
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143017x15131012187962
Subject(s) - chemical oxygen demand , effluent , hydraulic retention time , biomass (ecology) , volatile suspended solids , activated sludge , chemistry , pulp and paper industry , fraction (chemistry) , mixed liquor suspended solids , biodegradation , suspended solids , anaerobic digestion , total suspended solids , anaerobic exercise , environmental science , wastewater , environmental engineering , chromatography , methane , ecology , physiology , organic chemistry , engineering , biology
The study investigated the unbiodegradable fraction of particulate chemical oxygen demand (PCOD) in thickened waste activated sludge (TWAS) using semicontinuous‐flow completely‐mixed anaerobic digesters. A laboratory‐scale semicontinuous stirred tank reactor was used to investigate TWAS anaerobic biodegradability at hydraulic retention time of 16.7 d to 33.3 d and organic loading rate (OLR) of 1.21 kg COD/m 3 •d to 3.47 kg COD/m 3 •d. The COD and volatile suspended solids (VSS) removal for TWAS were 37% to 44% and 39% to 42% at an OLR of 1.27 and 3.47 kg COD/m 3 •d, respectively. Using a biomass yield ( Y AD ) of 0.29 g COD biomass/g COD substrate, decay rate ( b AD )of 0.015 d −1 ; and a solids retention time (SRT) of 16.7 d; two linear fits correlating the difference between effluent biomass; and effluent particulate COD with influent total COD, the unbiodegradable fractions of PCOD and VSS were estimated from the slopes of the linear fits to be in the range of 0.26 to 0.28.