Premium
Effect of Operational Parameters on the Removal of Particulate Chemical Oxygen Demand in the Activated Sludge Process
Author(s) -
Jimenez Jose A.,
La Motta Enrique J.,
Parker Denny S.
Publication year - 2007
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 - 10.2175/106143007x175717
Subject(s) - mixed liquor suspended solids , activated sludge , particulates , volatile suspended solids , aeration , chemical oxygen demand , chemistry , flocculation , suspended solids , substrate (aquarium) , aerated lagoon , pulp and paper industry , extracellular polymeric substance , waste management , biochemical oxygen demand , environmental engineering , chemical engineering , wastewater , environmental science , oceanography , organic chemistry , biofilm , biology , bacteria , engineering , genetics , geology
The removal of particulate material in the aeration basin of the activated sludge process is mainly attributed to bioflocculation and hydrolysis of particulate substrate. The bioflocculation process in the aeration tank of the activated sludge process occurs only under favorable conditions in the system, and several common operational parameters affect its performance. The principal objective of this research was to observe the effect of mixed liquor suspended solids, solids retention time (SRT), and extracellular polymer substances on the removal of particulate substrate by bioflocculation. A first‐order particulate removal expression, based on flocculation, accurately described the removal rates for supernatant suspended solids and colloidal chemical oxygen demand. Based on the results presented in this investigation, a mixed liquor concentration of approximately 2200 mg/L, an SRT of at least 3 days, and a contact time of 30 minutes are needed for relatively complete removal of the particulate substrate in a plug‐flow reactor.