河北科技大学环境科学与工程学院,河北省污染防治生物技术实验室,石家庄 050018
Pollution Prevention Biotechnology Laboratory of Hebei Province, School of Environmental Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, China
为考察苯扎氯铵(benzalkonium chlorides,BACs)对活性污泥微生物活性的影响,以BACs的主要成分十二烷基二甲基苄基氯化铵(dodecylbenzyldimethylammonium chloride, DDBAC)为研究对象,分析了DDBACs对活性污泥耗氧速率(OUR)、比氨氧化率(SAOR)、亚硝酸盐氧化率(SNOR)、硝酸盐还原率(SNRR)、TCC-脱氢酶活性、过氧化氢酶(CAT)活性的影响及活性污泥对DDBAC的降解能力,探讨了城市污水中BACs对污泥微生物活性及水生态系统的潜在影响。结果表明:DDBAC能够影响污泥的耗氧速率,抑制污泥的呼吸作用,降低TCC-脱氢酶和过氧化氢酶活性;DDBAC对硝化过程,尤其是氨氧化菌主导的氨氧化过程的抑制作用更加显著;当DDBAC浓度≥2.0 mg·L
-N的转化,且浓度越高,抑制效果越明显。同时,活性污泥微生物对DDBAC具有一定的去除潜力,但处理能力有限,出水中残留的DDBAC将增加水环境健康管理负担,提高安全用水的风险。
In view of the potential impact of BACs on the microbial activity of sludge, the dodecylbenzyldimethylammonium chloride (DDBAC) was taken as the research object in this study. The influences of BBDAC with different concentrations on oxygen uptake rate (OUR), specific ammonia oxidation rate (SAOR), specific nitrite oxidation rate (SNOR), and specific nitrate reduction rate (SNRR) of activated sludge, TCC-dehydrogenase activity and catalase (CAT) activity were analyzed, as well as the degradation of BBDAC by activated sludge. Besides, the potential effect of BACs in municipal sewage on the microbial activity of sludge and the water ecosystem were investigated. The results showed that DDBAC could affect the oxygen consumption rate of sludge, inhibit the respiration of sludge, and reduce the activities of TCC-dehydrogenase and catalase. In addition, DDBAC showed more significant inhibition effect on the nitrification process, especially the ammonia-oxidizing process dominated by ammonia-oxidizing bacteria. At DDBAC concentration ≥2.0 mg·L
-N was inhibited, and the higher the concentration, the more obvious the inhibition effect. At the same time, activated sludge microorganisms had a certain potential to remove DDBAC, but the treatment capacity was limited. The residual DDBAC in effluent will increase the burden of water environmental health management and increase the risk of safe water use.
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投加不同浓度DDBAC后污泥耗氧速率的变化
Change of sludge oxygen uptake rate with different DDBAC concentrations
不同浓度DDBAC暴露下氨氮、亚硝氮的变化
Changes of ammonia nitrogen and nitrous oxide with different concentrations of DDBAC
投加不同浓度DDBAC后SAOR、SNOR和SNNR的变化
Changes in SAOR, SNOR and SNNR with different DDBAC concentrations
DDBAC对TCC-脱氢酶活性、过氧化氢酶活性的影响
Effect of DDBAC on TCC-dehydrogenase activity and catalase activity
Removal effect of DDBAC by microorganisms
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