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Treatment of Septage Using an Upflow Anaerobic Sludge Blanket Reactor
Author(s) -
Lin ChiuYue,
Chang FengYun,
Chang ChunHao
Publication year - 2001
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 - 10.2175/106143001x139443
Subject(s) - chemical oxygen demand , hydraulic retention time , blanket , wastewater , chemistry , suspended solids , volatile suspended solids , total suspended solids , pulp and paper industry , methane , biochemical oxygen demand , granule (geology) , anaerobic digestion , sewage treatment , nuclear chemistry , environmental engineering , environmental science , materials science , organic chemistry , engineering , composite material
This study examined the feasibility of applying an upflow anaerobic sludge blanket (UASB) reactor to treat septage. The UASB reactor was operated at 35 ± 1 °C, and the substrate septage had a total solids (TS) concentration of 13 200 mg/L. Reactor operation was initiated at a hydraulic residence time (HRT) of 10 days; thereafter, the HRT was shortened stepwise to 1.5 days. The TS, volatile solids (VS), and organic loading rates were 1.4 to 9.4 kg TS/m 3 ·d, 5.6 to 8.5 kg VS/m 3 ·d, and 1.1 to 6.7 kg chemical oxygen demand (COD)/m 3 ·d, respectively. At the organic loading rate of 6.7 kg COD/m 3 ·d (the HRT of 1.5 days), the total COD, soluble COD, and TS and VS removal efficiencies were 68, 74, and 66 and 73%, respectively. The average granule diameter and volatile suspended solids concentration were approximately 0.89 mm and 32 000 mg/L, respectively. Based on results obtained from 7 months of constant methane production and removal efficiencies, which are comparable to values previously reported in the literature for wastewater, it was concluded that a UASB reactor can successfully treat septage.