pH对生物脱硫系统的性能及菌群结构的影响  

Influence of pH on the Performance and Microbial Community Structure of Bio-desulfurization System

作　　者：贾体沛 彭轶 孙事昊 彭永臻[1] JIA Tipei;PENG Yi;SUN Shihao;PENG Yongzhen(National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology,Faculty of Environment and Life,Beijing University of Technology,Beijing 100124,China;Xinkai Environmental Investment Co.Ltd.,Beijing 101101,China;Beijing Xintong Bishui Reclaimed Water Co.Ltd.,Beijing 101149,China)

机构地区：[1]北京工业大学环境与生命学部城镇污水深度处理与资源化利用技术国家工程实验室,北京100124 [2]信开环境投资有限公司,北京101101 [3]北京信通碧水再生水有限公司,北京101149

出　　处：《北京工业大学学报》2023年第12期1358-1367,共10页Journal of Beijing University of Technology

基　　金：国家自然科学基金资助项目(52131004);通州区科技计划项目(KJ2023CX097)。

摘　　要：为探究pH对生物脱硫反应器性能、生物量及微生物种群结构的影响,一座生物滴滤池(bio-trickling filter,BTF)分别运行在中性偏碱(6.0<pH<9.5)、弱酸(2.6<pH<5.5)和极酸(pH<1.0)环境下。结果表明,BTF获得对H_(2)S的最大脱硫性能分别为246.5、142.8和164.6 g/(m^(3)·h)。中性偏碱下BTF的脱硫性能最佳,这是由于较低的H2 S气液传质阻力及较高的硫氧化菌活性。保持此pH范围需消耗大量碱性试剂,这导致反应器的运行成本升高和操作过程变得复杂。在极酸环境中,耐酸的硫氧化菌——Mycobacterium逐渐占据主导(79.2%),且生物膜拥有高硫氧化活性(比耗氧速率1.35 mg/(g·min)),非耐酸的微生物被淘汰,这维持了系统内生物量的稳定(生物量质量浓度10~11 g/L),避免了反应器的堵塞,降低了生物量控制和pH调整的成本。综上,通过富集高丰度且高活性嗜酸的Mycobacterium,BTF在极酸环境(pH<1.0)下仍可获得较高的脱硫性能,扩大了生物反应器运行的pH范围。The study investigated the effects of pH on a biological desulfurization reactor's performance,biomass,and microbial structure.Using a bio-trickling filter(BTF),it operated under neutral-alkaline(6.0<pH<9.5),mildly acidic(2.6<pH<5.5),and extremely acidic(pH<1.0)conditions,respectively.Maximum H2S elimination capacities achieved were 246.5,142.8 and 164.6 g/(m^(3)·h),respectively.The BTF performed best under neutral-alkaline condition due to reduced H_(2)S gas-liquid mass transfer resistance and increased activity of sulfur-oxidizing bacteria,however,this required significant alkaline reagents,raising costs and complicating the process.In extremely acidic condition,acidophilic sulfur-oxidizing bacteria,Mycobacterium,became dominant(79.2%),and the biofilm possessed high sulfur-oxidizing activity(with specific oxygen uptake rate of 1.35 mg/(g·min)).Non-acid-tolerant microbes were eliminated,preventing reactor clogging and reducing biomass control and pH adjustment costs.Thus,by enriching acidophilic Mycobacterium,BTF can maintain high desulfurization performance under highly acidic conditions, broadening the operational pH range of biological reactors.

关 键 词：生物脱硫系统 不同pH范围 微生物群落结构 嗜酸硫氧化菌 脱硫性能 生物量控制 

分 类 号：X703[环境科学与工程—环境工程]