5 years ago

A novel free ammonia based pretreatment technology to enhance anaerobic methane production from primary sludge

A novel free ammonia based pretreatment technology to enhance anaerobic methane production from primary sludge
Guo-Jun Xie, Xu Zhou, Wei Wei, Haoran Duan, Qilin Wang
This study proposed a novel free ammonia (FA, i.e., NH3) pretreatment technology to enhance anaerobic methane production from primary sludge for the first time. The solubilization of primary sludge was substantially enhanced following 24 h FA pretreatment (250–680 mg NH3-N/L), by which the release of soluble chemical oxygen demand (SCOD) (i.e., 0.4 mg SCOD/mg VS added; VS: volatile solids) was approximately 10 times as much as that without pretreatment (i.e., 0.03 mg SCOD/mg VS added). Then, biochemical methane potential (BMP) tests demonstrated that FA pretreatment of 250–680 mg NH3-N/L was capable of enhancing anaerobic methane production while the digestion time was more than 7 days. Model based analysis indicated that the improved anaerobic methane production was due to an increased biochemical methane potential (B0) of 8–17% (i.e., from 331 to 357–387 L CH4/kg VS added), with the highest B0 achieved at 420 mg NH3-N/L pretreatment. However, FA pretreatment of 250–680 mg NH3-N/L decreased hydrolysis rate (k) by 24–38% compared with control (i.e., from 0.29 d−1 to 0.18–0.22 d−1), which explained the lower methane production over the first 7 days’ digestion period. Economic analysis and environmental evaluation demonstrated that FA pretreatment technology was environmentally friendly and economically favorable. Biotechnol. Bioeng. 2017;9999: 1–8. © 2017 Wiley Periodicals, Inc. A novel free ammonia (FA) pretreatment technology was proposed to enhance anaerobic methane production from primary sludge. This technology is a closed-loop technology because the key chemical (i.e., FA) required is from anaerobic digestion liquor, which is a by-product of wastewater treatment. This FA technology involves the installation of a small, simple mixing tank operated at atmosphere temperature and pressure, which is applicable to any existing wastewater treatment plants with an expected payback time of approximately one year.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/bit.26348

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