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Characterization of Hydrolysis Kinetics in Staged Anaerobic Digestion of Wastewater Treatment Sludge
Author(s) -
Zamanzadeh Mirzaman,
Parker Wayne 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 - 10.2175/106143017x15054988926497
Subject(s) - mesophile , anaerobic digestion , hydrolysis , chemistry , hydraulic retention time , chemical oxygen demand , sewage sludge , wastewater , pulp and paper industry , thermal hydrolysis , sewage treatment , waste management , sewage sludge treatment , environmental engineering , environmental science , methane , biochemistry , organic chemistry , biology , genetics , bacteria , engineering
The hydrolysis of mixed primary and secondary sludges in two‐stage anaerobic digestion was evaluated and compared with conventional single‐stage digestion, using various temperature‐phased configurations of M1‐M2, M1‐T3, T1‐T2, and T1‐M3. A dual hydrolysis model best described the hydrolysis in all tests. This model was also able to consistently estimate the readily and slowly fractions of particulate chemical oxygen demand (COD) of raw sludge used in the tests. The hydrolysis kinetic coefficients (K hyd_s and K hyd_r ) estimated for the mesophilic digesters were significantly greater in the short hydraulic retention time (HRT) M1 digester than those of the extended HRT digesters. Conversely, at thermophilic temperatures only K hyd_r was greater in short HRT T1 digester when compared to the extended HRT digesters. The increased K hyd_r and reduced K hyd_s values due to staging effect were explained with surface reaction models and endogenous decay. The temperature dependency of K hyd_s and K hyd_r was also explored in the staged digesters.