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

作者：Wei, Liangliang; Wang, Kun^*; Kong, Xiangjuan; Liu, Guangyi; Cui, Shuang; Zhao, Qingliang; Cui, Fuyi

来源：Frontiers of Environmental Science and Engineering, 2016, 10(2): 327-335.

DOI：10.1007/s11783-014-0763-9

• sewage sludge
• co-recovery
• proteins
• humic acid
• recycling
• biodegradation rate

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 ultrasonication and acid precipitation, and then the humic acid was recovered via membrane filtration. The extraction efficiency was 125.9 mg humic acid center dot g(-1)VSS volatile suspended solids (VSS) and 123.9 mg proteins center dot g(-1) VSS at the optimal ultrasonic density of 1.5W center dot 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.

• 出版日期2016-4
• 单位住房和城乡建设部城乡规划管理中心; 哈尔滨工业大学