Silver@silica nanopollen modified membranes for wastewater treatment in membrane bioreactors: limited adverse effects on microorganisms and compelling antifouling properties
Silver@silica nanopollen modified membranes for wastewater treatment in membrane bioreactors: limited adverse effects on microorganisms and compelling antifouling properties
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用于膜生物反应器废水处理的银@二氧化硅纳米花粉改性膜：对微生物的不利影响有限且具有引人注目的防污性能
DOI：
10.1039/d1ew00881a
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发表时间：
2022-01-19
影响因子：
5
通讯作者：
Zhang，Xingran
中科院分区：
文献类型：
--
作者：
Wang，Xueye;Guo，Yu;Zhang，Xingran
为了提高水和废水处理中的抗生物污染性能，人们探索了基于银纳米颗粒的膜。然而，它们的总体性能，如对微生物的毒性以及抗生物污损行为，都没有得到充分的解决。本研究将新型银固定二氧化硅纳米颗粒(Ag@SNP)与聚偏氟乙烯(PVDF)膜结合，以减轻膜生物反应器(MBR)运行中的污染。系统地研究了膜的抗生物污染行为，评价了膜对污泥活性和细菌群落的影响。长期运行(75d)表明，在膜表面修饰Ag@SNP在不影响出水水质、活性污泥活性和微生物群落多样性的情况下，具有显著的抗生物污染性能。试验MBR的运行周期(R2，32±17d)明显长于对照MBR的原膜运行周期(R1，16±7d)。同时，与R1相比，R2的脱氢酶活性和比吸氧率几乎没有变化，表明膜中银离子的释放对污泥絮体的毒性影响可能是有限的。长期接触纳米银对MBR系统中微生物的结构和多样性没有显著影响。本研究的结果将为银基抗生物污染膜在膜生物反应器处理废水中的潜在应用奠定基础。
Silver nanoparticle-based membranes have been explored to enhance antibiofouling performance in water and wastewater treatment. However, their overall performance such as the toxicity to microorganisms in addition to antibiofouling behaviours is not adequately addressed. In this study, novel Ag-immobilized silica nanopollens (Ag@Snp) were combined with polyvinylidene fluoride (PVDF) membranes, which can mitigate fouling in membrane bioreactor (MBR) operations. The antibiofouling behaviours were systemically investigated and the effects of membranes on both sludge activity and bacterial community were evaluated. Long-term operation (75 d) revealed that decoration of Ag@Snp on the membrane surface had compelling antibiofouling behaviours without compromising the effluent quality, activated sludge activity and microbial community diversity. The operation cycle of the test MBR (R2, 32 ± 17 d) was much longer than that of a pristine membrane in the control MBR (R1, 16 ± 7 d). Meanwhile, compared to those in R1, the dehydrogenase activity and specific oxygen uptake rate hardly varied in R2, suggesting that release of silver ions from membranes might have a limited toxic impact on the sludge flocs. The long-term nanosilver exposure did not significantly affect the structure and diversity of microorganisms in the MBR system. The findings of this study would underpin the potential application of the silver-based antibiofouling membrane in MBRs for wastewater treatment.