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
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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PO43--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-，Ca2+与发酵系统中的NH4+-N和PO43--P形成鸟粪石沉淀，有利于氮和磷物质的有效回收.Abstract: The different dose CaO2 was added into the waste activated sludge anaerobic fermentation system which studied the effect of CaO2 on the WAS anaerobic fermentation performance.The results showed that CaO2 could enhance the WAS solubilization and sludge decomposition,and increase the WAS hydrolysis performance,the mass concentration of protein and polysaccharide increased with the CaO2 addition.At the same time,appropriate concentration of CaO2 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 NH4+-N increased first then declined with the increase of CaO2 addition,but the release amount of PO43--P declined with the increase of CaO2 addition.From the analysis of mechanism perspective,CaO2 dissolved in water to form strong oxidizing substances such as OH-, O2-, H2O2, 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 Ca2+ with NH4+-N and PO43--P in the fermentation system, which was beneficial to the effective recovery of nitrogen and phosphorus substances.
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