CaO<sub>2</sub>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

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

doi:10.3969/j.issn.2096-1553.2019.04.010

July 2019

Article Contents

NIU Jintao, JIN Baodan, ZHOU Ping, et al. Effects of CaO2 on the anaerobic fermentation acidification performance and biological enzyme activity of waste activated sludge in municipal wastewater treatment[J]. Journal of Light Industry, 2019, 34(4): 64-73,108. doi: 10.3969/j.issn.2096-1553.2019.04.010

Citation: NIU Jintao, JIN Baodan, ZHOU Ping, et al. Effects of CaO2 on the anaerobic fermentation acidification performance and biological enzyme activity of waste activated sludge in municipal wastewater treatment[J]. Journal of Light Industry, 2019, 34(4): 64-73,108. doi: 10.3969/j.issn.2096-1553.2019.04.010 shu

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

1. He'nan Collaborative Innovation Center of Environmental Pollution Control and Ecological Restoration, Zhengzhou University of Light Industry, Zhengzhou 450001, China;
2. He'nan Heng'an Environmental Protection Technology Co., Ltd., Zhengzhou 450001, China

Received Date: 2019-04-29

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 PO₄^3--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 PO₄^3--P in the fermentation system, which was beneficial to the effective recovery of nitrogen and phosphorus substances.
- waste activated sludge,
- anaerobic fermentation,
- Calcium peroxide,
- hydrolytic acidification,
- short volatile fatty acids,
- biological enzyme activity
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