硫酸盐胁迫下AnMBR系统中亚可见颗粒物的生成及其膜污染行为  

Formation of sub-visible micro-particles in the supernatant of AnMBRs under sulfate stress and their fouling behavior on membrane

作　　者：李自聪 陈子健 周忠波 陈玉成[1] 孟凡刚 LI Zicong;CHEN Zijian;ZHOU Zhongbo;CHEN Yucheng;MENG Fangang(Department of Environmental Science and Engineering,College of Resources and Environment,Southwest University,Chongqing 400715,China;Beijing Enterprises Water Group Limited(BEWG),Beijing 100015,China;Guangzhou Administration Institute,Guangzhou 510070,China;School of Environmental Science and Engineering,Sun Yat-sen University,Guangzhou 510006,China)

机构地区：[1]西南大学资源环境学院环境科学与工程系,重庆400716 [2]北控水务(中国)投资有限公司,北京100015 [3]广州行政学院,广州510070 [4]中山大学环境科学与工程学院,广州510006

出　　处：《环境工程学报》2024年第5期1265-1272,共8页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金项目(32161143031);重庆市自然科学基金项目(cstc2021jcyjmsxmX0399);重庆市万州科技计划(wzstc20210309)。

摘　　要：硫酸盐废水的厌氧生物处理一直是研究热点,关于硫酸盐对厌氧膜生物反应器(AnMBR)污泥混合液性质和上清液颗粒物组成及其膜污染行为的影响仍不明确。设置了3组AnMBRs,分别在不同COD/SO_(4)^(2-)比值(>10、2.5和0.5)下运行约200 d,探究了硫酸盐胁迫下AnMBR系统性能和上清液亚可见颗粒物(0.45~10µm)的产生及其膜污染行为。结果表明,随着COD/SO_(4)^(2-)比值的降低,上清液中COD值明显上升;当COD/SO_(4)^(2-)比值为0.5时,上清液COD增至近4000 mg·L^(−1),H_(2)S比例则高达约1.6%,产甲烷被严重抑制。相应地,高硫酸盐胁迫下跨膜压差TMP的增长速率显著增加。通过死端过滤实验发现,在相同TSS浓度下,高硫酸盐AnMBR系统中污泥混合溶液呈现出最差的过滤性能,其中上清液过滤性能与污泥混合液几乎相同;在相同COD值下高硫酸盐系统上清液过滤速度最慢,且膜阻力最高,滤饼层阻力占比高于95%。颗粒物尺寸分布分析结果表明,高硫酸盐胁迫下AnMBR上清液中亚可见颗粒物的占比大大增加(小于10µm的颗粒物占比高达75%~80%);相比于污泥上清液,在高硫酸盐胁迫下AnMBR膜表面滤饼层中0.45~1µm和1~5µm的亚可见颗粒物具有较高的累积潜能。以上研究结果可为进一步优化膜污染控制提供参考。Anaerobic biological treatment of sulfate wastewater has been a research hotspot,but less attention has been paid to the effect of sulfate on the properties of sludge mixture,the micro-particles composition of supernatant and their correlations with membrane fouling behavior.In this study,three identical AnMBRs were set up and operated at different COD/SO_(4)^(2-)ratios of>10,2.5 and 0.5 for over 200 days,respectively,to reveal the effects of different COD/SO_(4)^(2-)ratios on the performance of AnMBR system,the formation of sub-visible micro-particles(0.45~10µm)in the supernatant and their fouling behavior.The results showed that the COD concentration in the supernatant increased significantly with the decrease of COD/SO_(4)^(2-)ratios;at COD/SO_(4)^(2-)ratio of 0.5,the COD value of supernatant increased to 4000 mg·L^(−1),and the ratio of H_(2)S was up to 1.6%,and the methanogens were severely inhibited.Accordingly,the growth rate of the transmembrane pressure(TMP)increased significantly under high sulfate stress.The dead-end filtration test indicated that at the identical TSS concentration,the sludge mixed solution of AnMBRs showed the worst filterability and the membrane filtration behavior of the supernatant was almost identical with the sludge mixed solution.In addition,at the same COD concentration,the filtration rate of the supernatant was the slowest for the high sulfate stress group,and the membrane resistance was the highest,where the percentage of cake layer fouling resistance was over 95%.Furthermore,the concentration of micro-particles(0.45~10µm)in the supernatant under high sulfate stress increased distinctly(the percentage of<10µm particles being 75%~80%).More importantly,the proportion of particles in the range of 0.45~5µm in the cake layer of membrane surface was higher than that in the supernatant,indicating that these micro-particles in the supernatant had a higher accumulation potential on the membrane.Overall,our work could provide some theoretical basis for understandings and further

关 键 词：厌氧膜生物反应器 膜污染 硫酸盐 微细颗粒物 

分 类 号：X703[环境科学与工程—环境工程]