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Multiple uses of magnesium chloride during waste activated sludge alkaline fermentation
Roby Ruhyadi1, Yun Chen2, Nan Shen2
1School of Environment, Nanjing Normal University, Nanjing, Jiangsu 210023, People's Republic of China; Solid Waste Reduction Section, Environmental Agency of Bogor Regency, Bogor Regency, West Java 16911, Indonesia.
Abstract:
Multiple uses of magnesium chloride during waste activated sludge (WAS) alkaline fermentation was investigated. The results revealed that a higher MgCl2 concentration inhibited acidogenesis, while the purity of volatile fatty acids (VFAs) improved and the maximum percentage of VFAs accounted for 52.92% (w/w) of soluble chemical oxygen demand (SCOD) at 120 mmol/L Mg2+. A phosphate removal efficiency of 81.22% was obtained at 15 mmol/L MgCl2 concentration, while only a 14.77% increase was observed when further MgCl2 was added (120 mmol/L MgCl2). Capillary suction time (CST) values decreased sharply from 4410.20 s to 207.30 s with the increase of MgCl2. A similar trend was observed in bound water and the minimum value was 85.56 ± 0.06%. The distribution of extracellular polymeric substances (EPS) and rheological profiles of the fermented sludge were also analyzed and the results confirmed that a high MgCl2 concentration had a positive effect on sludge dewatering.
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