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Supervised by Ministry of Industry and Information Technology of The People's Republic of China Sponsored by Harbin Institute of Technology Editor-in-chief Yu Zhou ISSNISSN 1005-9113 CNCN 23-1378/T

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Related citation:Xiaodong Xin,Junming Hong,Junguo He,Wei Qiu,Bor-Yann Chen.Microbial Community Profiles Related to Volatile Fatty Acids Production in Mesophilic and Thermophilic Fermentation of Waste Activated Sludge Pretreated by Enzymolysis[J].Journal of Harbin Institute Of Technology(New Series),2020,27(4):60-73.DOI:10.11916/j.issn.1005-9113.18132.
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Microbial Community Profiles Related to Volatile Fatty Acids Production in Mesophilic and Thermophilic Fermentation of Waste Activated Sludge Pretreated by Enzymolysis
Author NameAffiliation
Xiaodong Xin Department of Environmental Science and Engineering, Huaqiao University, Xiamen 361021, China
Department of Environmental Science and Engineering, Huaqiao University, Xiamen 361021, China 
Junming Hong Department of Environmental Science and Engineering, Huaqiao University, Xiamen 361021, China 
Junguo He State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China 
Wei Qiu State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China 
Bor-Yann Chen Department of Chemical and Materials Engineering, I-Lan University, I-Lan 26047, Taiwan, China 
Abstract:
Mesophilic and thermophilic anaerobic fermentation performance of waste activated sludge (WAS) pretreated by enzymes catalysis associated with microbial community shifts were investigated. WAS disintegration was boosted considerably by enzymolysis with 8750 mg/L of soluble COD release within 180 min. Mesophilic anaerobic fermentation (MAF) produced nearly equal VFA accumulation with over 3200 mg COD/L compared with that of thermophilic fermentation (TAF). Bacterial community consortia showed great shifting differences in dynamics of main T-RFs between MAF and TAF. Moreover, MAF was conducive to form intermediate bacterial community evenness compared to TAF, which preserved a robust function of VFA production. The enzymes catalysis prompted bio-energy (electricity) recovery potential of WAS organics via anaerobic fermentation (MAF/TAF) with evaluating electricity conversion efficiency of 0.75-0.82 kW·h/kg VSS (3.9 times higher than control test). Finally, this study proposed some novel thinking on future WAS treatment/management towards energy recovery coupled with energy-sufficient wastewater treatment by co-locating WAS anaerobic fermentation, MFC plant with wastewater treatment plant(s).
Key words:  waste activated sludge (WAS)  enzymes catalysis  volatile fatty acid (VFA)  bacterial community  electric energy conversion
DOI:10.11916/j.issn.1005-9113.18132
Clc Number:X703
Fund:
Descriptions in Chinese:
  

酶溶剩余污泥中高温发酵过程中微生物群落动态与短链脂肪酸积累的关系研究

辛晓东1,王冰鑫1,洪俊明1,赫俊国2,邱微2,陈博彦3

(1.华侨大学 环境科学与工程系, 福建 厦门 361021;

2.哈尔滨工业大学 城市水资源与水环境国家重点实验室, 哈尔滨 150090;

3. 宜兰大学 化学工程与材料工程学系(所),台湾 宜兰 26047,中国)

创新点说明:

1) 分析了酶溶预处理对剩余污泥水解溶胞效果,并发现酶溶剩余污泥在中温发酵和高温发酵中VFA积累含量基本处于同等水平;

2) 酶溶污泥中温发酵与高温发酵体系中微生物群落结构动态差异明显;与高温发酵相比,中温发酵体系中微生物群落均匀度较为适中,有助于强化体系中产酸群落的功能性;

3) 从产能角度分析,酶溶预处理大幅提高了剩余污泥的能源回收效率,为未来污水处理厂的剩余污泥处理及能源化提供一种新思路。

研究目的:

研究酶溶法对剩余污泥的溶胞水解效能,分析酶溶污泥的中温及高温厌氧发酵产VFA的效能,并揭示发酵体系中VFA积累与产酸微生物群落动态的关系,分析酶溶预处理对剩余污泥有机质向电能转化的强化作用,为未来剩余污泥的高效处理及能源化提供一种新思路。

研究方法:

1) 通过运行厌氧生物反应装置考察酶溶污泥的厌氧产酸发酵效能;

2) 利用T-RFLP分析发酵体系中产酸菌群的群落结构动态;

3) 绘制洛伦兹曲线描述发酵体系中产酸菌群的均匀度变化;

4) 利用数据排序分析(RDA)揭示VFA积累与环境变量的相关联系。

研究结果:

1) 研究了酶溶预处理对剩余污泥水解溶胞效果,发现在180min内污泥液相中SCOD升高至8750 mg/L;中温发酵第10天,VFA含量积累超过3200 mg COD/L,与高温发酵过程中VFA累积含量基本持平;

2)中温发酵体系中微生物群落均匀度低于高温发酵过程,推测其有助于强化发酵体系中菌群的产酸功能性;

3) 酶溶预处理大幅提高了剩余污泥的能源回收效率,经估算剩余污泥的电能转化效率可达到0.75-0.82 kW h/kg VSS。

结论:

1) 复合生物酶(蛋白酶、α-淀粉酶、溶菌酶及纤维素酶)可高效提高剩余污泥的水解溶胞效果,且酶溶剩余污泥在中温发酵和高温发酵中VFA积累基本持平;

2) 发酵温度对产酸菌群结构有明显影响,中温发酵体系中微生物群落均匀度低于高温发酵过程,有助于中温发酵中VFA的快速积累;

3) 酶溶法可大幅提高剩余污泥的能源回收效率,为实现未来污水处理厂的能耗自足提供一种新思路。

关键词:剩余污泥;生物酶催化;挥发性脂肪酸;微生物群落;电能转化

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