摘要
针对膜生物反应器膜污染的问题,为探究模拟物质替代实际物质的可行性,以胞外聚合物(EPS)及其模拟溶液(BSA+SA)为研究对象,对比了钙离子(Ca2+)存在下胞外聚合物及其模拟溶液在膜污染中的差异,考察了EPS-Ca2+和BSA+SA-Ca2+在粒径分布、官能团、流变特性和膜污染行为等方面的差异。结果表明:Ca2+使得溶液粒径变大,且EPS-Ca2+的平均粒径大于BSA+SA-Ca2+的平均粒径;不同官能团与Ca2+发生作用导致红外光谱中特征峰发生偏移;BSA+SA-Ca2+水胶体系结构更稳定,随着应变的增大,胶体结构被破坏的程度较轻;在微滤过程中,相同操作条件下,BSA+SA-Ca2+的膜污染现象更为严重。进一步采用Hermia过滤模型拟合发现,EPSCa2+和BSA+SA-Ca2+分别对中间堵塞模型和滤饼层过滤模型的拟合程度最高。上述结果可为膜污染过程中胞外聚合物及其膜污染机理研究提供参考。
The scientific interests in membrane fouling of membrane bioreactors have increased drastically in recent years.In order to investigate the feasibility of simulating substances to replace actual substances,the present study compared the different performance of extracellular polymeric substances(EPS) and model EPS solution(BSA+SA) in the presence of Ca2+on the membrane fouling.The differences in particle size distribution,functional groups,rheological properties and membrane fouling behaviors of EPS-Ca2+and BSA+SA-Ca2+were investigated systematically.The results showed that Ca2+enlarged the particle size,and the average particle size of EPS-Ca2+was larger than the that of BSA+SA-Ca2+.Owing to the interactions between different functional groups and Ca2+,the shift of the characteristic peaks in FT-IR spectrum occurred.By comparison of the rheological properties with EPS-Ca2+hydrocolloid,the BSA+SA-Ca2+hydrocolloid exhibited a more stable structure which presented a less destruction as the strain increased.In the microfiltration process,the membrane fouling of BSA+SA-Ca2+was more serious under the same operating conditions.Through the data fitting with Hermia’s filtration model,it was found that EPS-Ca2+and BSA+SA-Ca2+obeyed the intermediate blocking model and the cake formation model,respectively.The results would provide basic data for the research of EPS and its membrane fouling mechanism.
作者
陆薇儿
修光利
LU Weier;XIU Guangli(Shanghai Key Laboratory of Environmental Standards and Risk Management of Chemical Pollutants,East China University of Science and Technology,Shanghai 200237,China;National Environmental Protection Chemical Process Environmental Risk Assessment and Control Key Laboratory,East China University of Science and Technology,Shanghai 200237,China;Shanghai Institute of Pollution Control and Ecological Safety,Shanghai 200092,China)
出处
《环境工程学报》
CAS
CSCD
北大核心
2020年第4期1003-1012,共10页
Chinese Journal of Environmental Engineering
关键词
胞外聚合物
膜污染
钙离子
牛血清白蛋白
海藻酸钠
恒压过滤
extracellular polymeric substances
membrane fouling
calcium ion
bovine serum albumin
sodium alginate
constant-pressure filtration
