CaO2对城市污水处理中剩余污泥厌氧发酵产酸性能与生物酶活性的影响  

Effects of CaO2 on the anaerobic fermentation acidification performance and biological enzyme activity of waste activated sludge in municipal wastewater treatment

作　　者：钮劲涛 金宝丹 周萍 牛佳慧 张局 张钟方 陶泓帆 马志刚 代菁雯 李诺楠 NIU Jintao;JIN Baodan;ZHOU Ping;NIU Jiahui;ZHANG Ju;ZHANG Zhongfang;TAO Hongfan;MA Zhigang;DAI Jingwen;LI Nuonan(He′nan Collaborative Innovation Center of Environmental Pollution Control and Ecological Restoration,Zhengzhou University of Light Industry,Zhengzhou 450001,China;He′nan Heng′an Environmental Protection Technology Co.,Ltd.,Zhengzhou 450001,China)

机构地区：[1]河南省环境污染治理与生态修复协同创新中心,郑州轻工业大学,河南郑州450001 [2]河南恒安环保科技有限公司,河南郑州450001

出　　处：《轻工学报》2019年第4期64-73,108,共11页Journal of Light Industry

基　　金：河南省自然科学基金项目(182300410140);郑州轻工业大学众创空间孵化项目(2018ZCKJ201)

摘　　要：将CaO2添加至城市污水处理剩余污泥厌氧发酵系统中,研究CaO2添加量对剩余污泥水解酸化和厌氧发酵性能的影响,结果表明:CaO2的添加能够促进污泥溶液化和分解,提高污泥水解性能,发酵系统中的蛋白质和多糖质量浓度随着CaO2添加量的增加而增大;适当添加CaO2能够促进污泥厌氧发酵产酸,且产酸过程具有延迟性,也能促进蛋白酶、α-葡萄糖苷酶和脱氢酶的活性,但会严重抑制碱性磷酸酶和酸性磷酸酶的活性;随着CaO2添加量的增加,NH4^+-N释放量先增大后降低,而PO4^3--P释放量则呈降低趋势.从机理角度分析,CaO2溶于水后生成OH^-,O2^-,H2O2等强氧化物质,能够有效破坏微生物细胞壁,强化污泥水解,OH-形成的碱性环境可抑制产甲烷菌的活性,降低SCFAs的消耗,OH^-,Ca^2+与发酵系统中的NH4^+-N和PO4^3--P形成鸟粪石沉淀,有利于氮和磷物质的有效回收.The different dose CaO 2 was added into the waste activated sludge anaerobic fermentation system which studied the effect of CaO 2 on the WAS anaerobic fermentation performance.The results showed that CaO 2 could enhance the WAS solubilization and sludge decomposition,and increase the WAS hydrolysis performance,the mass concentration of protein and polysaccharide increased with the CaO 2 addition.At the same time,appropriate concentration of CaO 2 could promote sludge anaerobic fermentation to produce acid and it was delayed,and also could promote the activity of protease,α-glucosidase and dehydrogenase,but suppressed alkaline phosphatase and acid phosphatase.The release amount of NH 4^+-N increased first then declined with the increase of CaO 2 addition,but the release amount of PO 4 ^3--P declined with the increase of CaO 2 addition.From the analysis of mechanism perspective,CaO 2 dissolved in water to form strong oxidizing substances such as OH^-,O 2-,H 2O 2,which could effectively destroy the microbial cell wall and strengthen the hydrolysis of sludge.The alkaline environment formed by OH^-inhibited the activity of methanogens and reduced the consumption of SCFAs,a struvite precipitate was formed by the action of OH^-and Ca ^2+with NH 4^+-N and PO 4 ^3--P in the fermentation system,which was beneficial to the effective recovery of nitrogen and phosphorus substances.

关 键 词：剩余污泥 厌氧发酵 CAO2 水解酸化 短链脂肪酸 生物酶活性 

分 类 号：X703[环境科学与工程—环境工程]