膜生物反应器(MBR)处理不同浓度高硫酸盐有机废水污泥性质和膜污染研究  

Sludge properties and membrane fouling of aerobic membrane bioreactor(MBRs)in treating organic wastewater with different concentrations of sulfate

作　　者：肖小兰[1] 干永鹏 冯永锐 王潇 阮文权[1,2] XIAO Xiaolan;GAN Yongpeng;FENG Yongrui;WANG Xiao;RUAN Wenquan(School of Environmental and Civil Engineering,Jiangnan University,Wuxi,214122,China;Wuxi Masun Environmental Energy Technology Co.,Ltd,Wuxi,214122,China)

机构地区：[1]江南大学环境与土木工程学院,无锡214122 [2]无锡马盛环境能源科技有限公司,无锡214122

出　　处：《环境化学》2023年第8期2754-2766,共13页Environmental Chemistry

基　　金：国家重点研发计划绿色生物制造专项(2021YFC2102200);江苏省社会发展-面上项目(BE2020755);无锡市科技成果产业化资金-“太湖之光”科技攻关(产业化关键技术攻关)(C20212004);中央高校基本科研业务费专项资金(JUSRP122027)资助。

摘　　要：针对食品加工过程中产生的高SO_(4)^(2-)的高浓度有机物废水,采用膜生物反应器(MBR)工艺对其进行处理研究,分别考察了1.6%和2.6%SO_(4)^(2-)浓度下反应器运行性能、污泥性质和膜污染变化情况.经过110d的运行时间对比发现,1.6%SO_(4)^(2-)浓度下MBR获得的最大有机负荷为1.0kg(md)COD,其化学需氧量(COD)、氨氮和总氮的去除率分别为97.2%、92.5%和89.5%.2.6%SO_(4)^(2-)浓度下微生物受到的抑制更强,其获得的最大有机负荷仅为0.5kg(m^(3)·d)^(-1)COD,其COD、氨氮和总氮的去除率分别为96.3%、82.6%和80.7%.此外,SO_(4)^(2-)浓度为1.6%的反应器在更高的膜运行通量下,膜污染速率反而比2.6%系统更慢.进一步分析其污泥性质发现SO_(4)^(2-)浓度为1.6%系统内的混合液悬浮固体浓度(MLSS)和挥发性悬浮固体浓度(MLVSS)稳定在7.1g·L^(-)和5.9gL左右,MLVSS/MLSS值较初始污泥有所提高,从80.2%升高到83%.SOO_(4)^(2-)浓度为2.6%体系内MLSS和MLVSS稳定在6g·L^(-)和4.5g·L^(-)左右,MLVSS/MLSS较初始污泥有所降低,最终稳定在75%左右.较低的MLSS和MLVSS/MLSS加速了膜表面滤饼层的形成,导致2.6%SO_(4)^(2-)系统膜污染更快.经过长期的高盐环境驯化后,1.6%SO_(4)^(2-)和2.6%SO_(4)^(2-)系统成熟污泥的溶解性微生物产物(SMP)和结合性的胞外聚合物(BEPS)均有所上升,SMP从13.5mg:g VSS上升到20.4mgglVSS和65.3mgglVSS,BEPS从36.9mgglVSS上升到181.8mggVSS和227.3mg·g^(-1)VSS.2.6%SO_(4)^(2-)系统的SMP和BEPS的值均大于1.6%SO_(4)^(2-)系统,从而使得2.6%SO_(4)^(2-)系统的TMP上升加快,膜污染加剧.1.6%系统MBR中污泥粒径从接种时的82.3μm增加至125.84μm,而2.6%SO_(4)^(2-)系统中污泥粒径降至78.23μm.相较于1.6%SO_(4)^(2-)系统,2.6%SO_(4)^(2-)系统的污泥粒径更小,更容易堆积于膜表面,使得滤饼层更加紧致,加速了膜污染的形成.两套装置的膜阻力都主要来源于外部阻力,但2.6%SO_(4)^(2-)系统的内部阻力占比较1.6%SO_(4)^(2tThe organic wastewater with high SO_(4)^(2-)concentration produced in the food processing plant was treated by aerobic membrane bioreactor(MBR)process,and the performance,sludge properties and membrane fouling of the MBR were investigated at different SO concentrations of 1.6%and 2.6%respectively.For the operation period of 110 days,it was found that the maximum organic loading rate(OLR)of the MBR at the concentration of 1.6%SO_(4)^(2-)was 1.0 kg·(m^(3)·d)^(-1)COD,and the removal efficiencies of chemical oxygen demand(COD),ammonia nitrogen and total nitrogen were 97.2%,92.5%and 89.5%respectively.However,at the concentration of 2.6%SO_(4)^(2-),the maximum OLR was only 0.5 kg·(m^(3)·d)^(-1) COD,and removal efficiencies of COD,ammonia nitrogen and total nitrogen were 96.3%,82.6%and 80.7%respectively.In addition,the membrane fouling rate of the reactor with 1.6%SO_(4)^(2-)concentration was slower than that of the 2.6%system,although the reactor with 1.6%SO_(4)^(2-)concentration operated at higher membrane flux than the 2.6%system.Further analysis of the sludge properties showed that the MLSS and MLVSS in the system with 1.6%SO_(4)^(2-)concentration were stable at about 7.1 g:L-'and 5.9 g L-1,and the MLVS/MLSS was 83%with higher than that of the initial sludge.The MLSS and MLVSS in the system with 2.6%SO_(4)^(2-)concentration were stable at 6 g:L-'and 4.5 g·L-,and the MLSS/MLVSS was only 75% with lower than that of the initial sludge.Lower MLSS and MLVSS/MLSS accelerated the formation of cake layer on the membrane surface,resulting in a serious membrane fouling of 2.6%SO_(4)^(2-)system.After long-term acclimation in high-salt environment,SMP and BEPS of mature sludge for 1.6%SO_(4)^(2-)and 2.6%SO_(4)^(2-)systems increased.SMP increased from 13.5 mg·g^(-1)VSS to 20.4 mg:g'VSSand 65.3 mg·g^(-1) VSS,and BEPS increased from 36.9 mg·g^(-1) VSS to 181.8 mg·g^(-1)VSS and 227.3 mg·g^(-1)VSS respectively for 1.6% SO_(4)^(2-)and 2.6% SO_(2) systems.The SMP and BEPS in 2.6%SO2 system were both higher than that of 1.6%

关 键 词：高有机物 高硫酸盐废水 好氧膜生物反应器 水处理 膜污染 

分 类 号：X703[环境科学与工程—环境工程]