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Application of ultra-sonication, acid precipitation and membrane filtration for co-recovery of protein and humic acid from sewage sludge |
Liangliang WEI1,2,Kun WANG2,*(),Xiangjuan KONG3,Guangyi LIU2,Shuang CUI4,Qingliang ZHAO1,2,Fuyi CUI2 |
1. Key Laboratory of Songliao Aquatic Environment (Ministry of Education), Jilin Jianzhu University, Changchun 130118, China 2. School of Municipal & Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China 3. Center of Science & Technology of Construction of the Ministry of Housing and Urban Rural Development of P. R. China, Beijing 100835, China 4. Procter & Gamble Company, Guangzhou 510620, China |
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Abstract A novel method was applied to co-recover proteins and humic acid from the dewatered sewage sludge for liquid fertilizer and animal feed. The proteins in sewage sludge were first extracted using the processes of ultra-sonication and acid precipitation, and then the humic acid was recovered via membrane filtration. The extraction efficiency was 125.9 mg humic acid?g−1VSS volatile suspended solids (VSS) and 123.9 mg proteins?g−1 VSS at the optimal ultrasonic density of 1.5 W?mL−1. FT-IR spectrum results indicated that the recovered proteins and humic acid showed similar chemical characteristic to the natural proteins and humic acid. The acidic solution (pH 2) could be recycled and used more than 10 times during the co-recovery processes. In addition, the dewatered sludge could be easily biodegraded when the humic acid and proteins are extracted, which was essential for further utilization. These findings are of great significance for recovering valuable nutrient from sewage sludge.
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Keywords
sewage sludge
co-recovery
proteins
humic acid
recycling
biodegradation rate
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Corresponding Author(s):
Kun WANG
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Online First Date: 11 December 2014
Issue Date: 01 February 2016
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