摘要
采用某煤化工污水处理厂深度脱氮反应器的脱膜产物对活性污泥进行强化脱氮,并揭示强化机理。结果表明,脱膜产物的最佳反硝化条件为:碳源为甲醇,碳氮比(C/N)为5,温度为30℃。当脱膜产物与活性污泥的混合液挥发性悬浮固体浓度(MLVSS)比为45%时,污泥的反硝化负荷从0.02 kgNO_(3)^(-)-N/(kgVSS·d)提高到0.23 kgNO_(3)^(-)-N/(kgVSS·d),略高于美国环保局推荐值。序批式反应器(SBR)的长期运行效果表明,强化反应器的容积负荷在35 d内均高于对照反应器。与对照组相比,脱膜产物的投加缩短了反应器的启动时间,提高了污泥内反硝化菌的丰度,增加了反硝化相关酶的功能基因的丰度,提高了污泥的硝酸盐还原酶(NR)活性和亚硝酸盐还原酶(NIR)活性。将深度脱氮反应器脱膜产物废物利用,为其强化污水脱氮的实际应用提供参考。
The sloughed biomass from a deep denitrification reactor of a coal-chemical wastewater treatment plant was used to enhance denitrification in activated sludge,and the enhancement mechanism was revealed.The results showed that the optimal denitrification conditions for the sloughed biomass were as follows:the carbon source was methanol,the carbon-to-nitrogen ratio(C/N)was 5,and the temperature was 30℃.When the ratio of the mixed-liquor volatile suspended solids concentration(MLVSS)of the sloughed biomass to that of the activated sludge was 45%,the denitrification load of the sludge increased from 0.02 kgNO_(3)^(-)-N/(kgVSS·d)to 0.23 kgNO_(3)^(-)-N/(kgVSS·d),which was slightly higher than the value recommended by the US Environmental Protection Agency.The long-term operation results of the sequencing batch reactor(SBR)indicated that the volume load of the enhanced reactor was higher than that of the control reactor within 35 days.Compared with the control group,the addition of the sloughed biomass shortened the start-up time of the reactor,increased the abundance of denitrifying bacteria in the sludge,increased the abundance of functional genes related to denitrification,and enhanced the activities of nitrate reductase(NR)and nitrite reductase(NIR)in the sludge.Reusing the sloughed biomass from the deep denitrification reactor provides a reference for its practical application in enhancing nitrogen removal from wastewater.
作者
耿广磊
陈晓蕾
阎登科
田敏慧
李海松
GENG Guanglei;CHEN Xiaolei;YAN Dengke;TIAN Minhui;LI Haisong(School of Ecology and Environment,Zhengzhou University,450001;School of Chemistry,Zhengzhou University,450001;Zhihe Environmental Science and Technology Co.,Ltd.,450000:Zhengzhou,China)
出处
《水处理技术》
北大核心
2026年第3期120-125,132,共7页
Technology of Water Treatment
基金
河南省重点研发专项(231111320100)。
关键词
废物利用
脱膜产物
强化脱氮
强化机理
waste utilization
sloughed biomass
enhance denitrification
enhancement mechanism
