Enhanced short-chain fatty acids production from waste activated sludge by combining calcium peroxide with free ammonia pretreatment
Author(s)
Wang, Dongbo
Shuai, Kun
Xu, Qiuxiang
Liu, Xuran
Li, Yifu
Liu, Yiwen
Wang, Qilin
Li, Xiaoming
Zeng, Guangming
Yang, Qi
Griffith University Author(s)
Year published
2018
Metadata
Show full item recordAbstract
This study reported a new low-cost and high-efficient combined method of CaO2 + free ammonia (FA) pretreatment for sludge anaerobic fermentation. Experimental results showed that the optimal short-chain fatty acids (SCFA) yield of 338.6 mg COD/g VSS was achieved when waste activated sludge (WAS) was pretreated with 0.05 g/g VSS of CaO2 + 180 mg/L of FA for 3 d, which was 2.5-fold of that from CaO2 pretreatment and 1.5-fold of that from FA pretreatment. The mechanism investigations exhibited that the CaO2 + FA could provided more biodegradable substrates, this combination accelerated the disintegration of sludge cells, which ...
View more >This study reported a new low-cost and high-efficient combined method of CaO2 + free ammonia (FA) pretreatment for sludge anaerobic fermentation. Experimental results showed that the optimal short-chain fatty acids (SCFA) yield of 338.6 mg COD/g VSS was achieved when waste activated sludge (WAS) was pretreated with 0.05 g/g VSS of CaO2 + 180 mg/L of FA for 3 d, which was 2.5-fold of that from CaO2 pretreatment and 1.5-fold of that from FA pretreatment. The mechanism investigations exhibited that the CaO2 + FA could provided more biodegradable substrates, this combination accelerated the disintegration of sludge cells, which thereby providing more organics for subsequent SCFA production. It was also found that the combination of CaO2 and FA inhibited the specific activities of hydrolytic microbes, SCFA producers, and methanogens to some extents, but its inhibition to methanogens was much severer than that to the other two types of microbes.
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View more >This study reported a new low-cost and high-efficient combined method of CaO2 + free ammonia (FA) pretreatment for sludge anaerobic fermentation. Experimental results showed that the optimal short-chain fatty acids (SCFA) yield of 338.6 mg COD/g VSS was achieved when waste activated sludge (WAS) was pretreated with 0.05 g/g VSS of CaO2 + 180 mg/L of FA for 3 d, which was 2.5-fold of that from CaO2 pretreatment and 1.5-fold of that from FA pretreatment. The mechanism investigations exhibited that the CaO2 + FA could provided more biodegradable substrates, this combination accelerated the disintegration of sludge cells, which thereby providing more organics for subsequent SCFA production. It was also found that the combination of CaO2 and FA inhibited the specific activities of hydrolytic microbes, SCFA producers, and methanogens to some extents, but its inhibition to methanogens was much severer than that to the other two types of microbes.
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Journal Title
Bioresource Technology
Volume
262
Subject
Environmental Technologies