摘要
本研究建立了实验室规模的小型序批式反应器(SBR),并在25~30℃的室温条件下系统研究了不同质量浓度苯扎贝特(BZF)对系统脱氮效能的影响规律。结果表明,低浓度BZF(0.2 mg/L)提高了COD及含氮无机盐的去除,并降低了N_(2)O的释放,而超过BZF浓度超过1.0 mg/L时,BZF对反应器运行产生负面影响并大幅提高N_(2)O的释放。在BZF浓度为5.0 mg/L组内,COD、总氮(TN)和磷酸盐去除率下降至75.8%~81.3%、61.6%和70.9%。0.2 mg/L BZF提高了污泥浓度、沉降性能,但降低了胞外聚合物(EPS)含量,而超过1.0 mg/L BZF降低污泥浓度并提高了污泥体积指数与EPS含量。高浓度BZF降低了比耗氧速率,提高了活性氧与乳酸脱氢酶的释放,降低了微生物代谢活性,从而导致污水生物处理效能下降。研究结果丰富了BZF在废水生物处理内的影响行为,并为后续BZF的精准控制提供一定参考依据。
This study established lab-scale sequencing batch reactors(SBRs)to systematically evaluate the effects of different BZF concentrations on nitrogen removal efficiency at an ambient temperature of 25~30℃.Results showed that low-concentration BZF(0.2 mg/L)enhanced the removal of chemical oxygen demand(COD)and inorganic nitrogenous salts while reducing nitrous oxide(N_(2)O)emissions.Conversely,BZF concentrations exceeding 1.0 mg/L exerted negative effects on reactor performance and significantly increased N_(2)O emissions.At a BZF concentration of 5.0 mg/L,the removal efficiencies of COD,total nitrogen(TN),and phosphate dropped to 75.8%~81.3%,61.6%,and 70.9%,respectively.Low-concentration BZF(0.2 mg/L)improved sludge concentration and settleability but reduced extracellular polymeric substances(EPS)content.In contrast,BZF concentrations≥1.0 mg/L decreased sludge concentration and increased the sludge volume index(SVI)and EPS content.High BZF concentrations also suppressed microbial metabolic activity by reducing the specific oxygen uptake rate(SOUR),increasing reactive oxygen species(ROS)production,and promoting lactate dehydrogenase(LDH)release—thereby impairing wastewater treatment efficiency.These findings enhance the understanding of BZF's behavior in biological wastewater treatment systems and provide a theoretical basis for precise BZF control in practical engineering applications.
作者
闫生辉
左蕾
李景璐
孙素颜
YAN Shenghui;ZUO Lei;LI Jinglu;SUN Suyan(Zhengzhou Technical College,450121;School of Chemistry,Zhengzhou University,450000:Zhengzhou,China)
出处
《水处理技术》
北大核心
2026年第3期126-132,共7页
Technology of Water Treatment
基金
2024年度河南省高等教育教学改革研究与实践项目(2024SJGLX0634)。
关键词
生物脱氮
苯扎贝特
胞外聚合物
比耗氧速率
biological denitrification
bezafibrate
extracellular polymeric substances
specific oxygen uptake rate
