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2016年 第10卷 第2期

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《环境科学与工程前沿（英文）》 >> 2016年 第10卷 第2期 doi: 10.1007/s11783-014-0763-9

Application of ultra-sonication, acid precipitation and membrane filtration for co-recovery of protein and humic acid from sewage sludge

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

录用日期： 2014-12-11 发布日期： 2016-02-01
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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 VSS volatile suspended solids (VSS) and 123.9 mg proteins?g VSS at the optimal ultrasonic density of 1.5 W?mL . 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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