XUYu-meng,LUJin-suo.Effect of Cation Exchange Resin Coupled with Lysozyme on SCFAs Production by Residual Sludge Anaerobic Fermentation[J].China Water & Wastewater,2024,40(5):23-28.
树脂耦合溶菌酶预处理对污泥厌氧发酵产酸的影响
- Title:
- Effect of Cation Exchange Resin Coupled with Lysozyme on SCFAs Production by Residual Sludge Anaerobic Fermentation
- Keywords:
- residual sludge; anaerobic fermentation; cation exchange resin; lysozyme; short-chain fatty acids
- 摘要:
- 缓慢的水解效率限制了剩余污泥厌氧发酵回收短链脂肪酸（SCFAs）。单独的预处理方法通常呈现出单一的有机物释放模式，导致污泥水解效率有限。通过单独树脂、溶菌酶和树脂+溶菌酶耦合实验，探究阳离子交换树脂耦合溶菌酶协同促进剩余污泥水解从而回收SCFAs的效果。结果表明，树脂+溶菌酶处理1 d后SCOD产量增加到5 824.16 mg/L，而对照、单独树脂和单独溶菌酶处理仅达到882.13~3 493.52 mg/L。树脂耦合溶菌酶处理显著促进了内源性有机物的增溶，提高了其可生物降解性。这为随后的生物转化提供了丰富的底物，实现了3 715.23 mg/L的SCFAs累积 （以COD计），分别是对照、树脂和溶菌酶组的7.26、2.41和1.75倍。同时，发酵污泥的脱水能力经化学调理后与对照组差别不大，回收的SCFAs可以作为工程中的替代碳源使用。
- Abstract:
- Slow hydrolysis efficiency limits the recovery of short-chain fatty acids (SCFAs) by residual sludge anaerobic fermentation. Individual pretreatment method usually presents single pattern of organic matter release, resulting in limited sludge hydrolysis efficiency. In this study, cation exchange resin-coupled lysozyme was used to synergistically promote the residual sludge hydrolysis and thus the SCFAs recovery through single resin, lysozyme and resin+lysozyme coupled experiments. The results showed that the SCOD production increased to 5 824.16 mg/L after 1-day resin+lysozyme treatment, whereas the control, individual resin and individual lysozyme treatments only reached 882.13-3 493.52 mg/L. The resin-coupled lysozyme treatment significantly promoted the solubilization of soluble organic matter and improved its biodegradability. This excellent solubilization of organic matter provided abundant substrate for subsequent biotransformation, achieving SCFAs accumulation of 3 715.23 mg/L, which was 7.26 times, 2.41 times and 1.75 times higher than that of the control, resin and lysozyme tests, respectively. Meanwhile, the dewatering capacity of the fermented sludge was not much different from the control test after chemical conditioning, and the recovered SCFAs could be used as an alternative carbon source in the project.
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