Xiao Haoliang, Chen Zhuqi, Ding Jiaqi, Zhang Ning, Ye Zhimin, Xiao Zhonghua, Wang Songlin, Xie Pengchao, Chen Yongsheng
School of Environmental Science and Engineering, Key Laboratory of Water & Wastewater Treatment (MOHURD), Hubei Provincial Engineering Research Center for Water Quality Safety and Pollution Control, Huazhong University of Science and Technology, Wuhan 430074, China.
Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education, Hubei Key Laboratory of Material Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
J Hazard Mater. 2024 Jan 15;462:132827. doi: 10.1016/j.jhazmat.2023.132827. Epub 2023 Oct 21.
In chemical membrane cleaning, the challenge is to efficiently remove irreversible fouling while minimizing the impact on membrane materials. Particularly, traditional hypochlorite cleaning will further lead to the generation of toxic halogenated by-products. To address these issues, a combined system composed of peroxymonosulfate and chloride (PMS/Cl) was applied to clean irreversible-humic-acid-fouled polyethersulfone (PES) membranes. After fouled membranes were soaked for 1 h in a PMS/Cl solution (10 mM/15 mM) at 25 °C under neutral conditions, 94% flux recovery and 96% resistance removal were realized. Surface properties of virgin and cleaned membranes were very similar, confirming the effectiveness of the PMS/Cl solution in removing irreversible foulants. The stability of membrane separation performance during multiple fouling and cleaning cycles further confirmed the minimal impact on membrane materials. Rapid diminution of the peaks centered in the region of fulvic-like and humic-like components, monitored under 3D-fluorescence for the cleaning solution, was attributed to PMS-catalyzed chlorination, thereby revealing the primary foulant detachment mechanism. Crucially, the approach exhibited lower toxicity than hypochlorite, as evidenced by reduced halogenated by-products and lower acute toxicity to Photobacterium phosphoreum T3. Overall, this novel cleaning system is promising for the efficient and environmentally friendly removal of irreversible organic foulants in practical water-treatment.
在化学膜清洗中，挑战在于有效去除不可逆污染，同时将对膜材料的影响降至最低。特别是，传统的次氯酸盐清洗会进一步导致有毒卤代副产物的生成。为了解决这些问题，采用了由过一硫酸氢钾和氯化物组成的联合系统（PMS/Cl）来清洗被不可逆腐殖酸污染的聚醚砜（PES）膜。在25℃中性条件下，将污染后的膜在PMS/Cl溶液（10 mM/15 mM）中浸泡1小时后，通量恢复率达到94%，阻力去除率达到96%。未使用过的膜和清洗后的膜的表面性质非常相似，证实了PMS/Cl溶液在去除不可逆污染物方面的有效性。在多次污染和清洗循环过程中膜分离性能的稳定性进一步证实了对膜材料的影响最小。清洗液在三维荧光监测下，以类富里酸和类腐殖酸成分为中心的峰快速减小，这归因于PMS催化的氯化作用，从而揭示了主要的污染物去除机制。至关重要的是，该方法的毒性低于次氯酸盐，这体现在卤代副产物减少以及对费氏弧菌T3的急性毒性降低。总体而言，这种新型清洗系统有望在实际水处理中高效、环保地去除不可逆有机污染物。
