净水技术2025，Vol.44Issue(5)：149-158,10.DOI:10.15890/j.cnki.jsjs.2025.05.016
纳滤阻垢剂优化与废膜直接再回用试验
Experiment of Optimization of NF Scale Inhibitors and Direct Reutilization of Waste Membrane
摘要
Abstract
[Objective]This study aims to develop a comprehensive multi-method membrane lifespan extension technology system tailored to the operational conditions of a nanofiltration(NF)membrane production line at a leachate treatment plant.By optimizing scale inhibitor formulations and exploring direct reuse technologies for waste membranes,the research seeks to reduce membrane fouling and cleaning frequency,increase NF system water production,and ultimately lower operational costs thus enhancing economic benefits.[Methods]A combined approach of laboratory analysis and field test was employed.First,compositional analysis of crystalline foulants on waste membrane samples was conducted using X-ray diffraction(XRD)and inductively coupled plasma(ICP)spectroscopy to identify major metal ion components.Subsequently,scale inhibitor formulation experiments were performed to determine the optimal blending ratio for the best scaling inhibition performance.Meanwhile,single-module cleaning tests were conducted on waste membrane elements from the production line,evaluating key performance indicators including flux recovery rate and pollutant rejection rate to identify reusable waste membranes and develop appropriate direct reuse strategies.[Results]The study revealed that Ca,Fe,and Mg were the predominant metal ions in membrane scaling.Scale inhibitor formulation tests found that a 1∶1 blend of polyaspartic acid(PASP)and the plant's original organic phosphates achieved optimal scaling inhibition performance,improving salt rejection by 3.3％.Waste membrane Cleaning tests showed that 17.6％of waste membranes(weight less than 20 kg)retained partial pollutant rejection capacity and could replace fractured membranes in production line when deployed as remedial units at the end of membrane tubes,enabling resource utilization.[Conclusion]The proposed scale inhibitor optimization scheme and waste membrane reuse technology demonstrate strong practicality and economic viability.These solutions can increase NF system water production without additional operational costs,while simultaneously reducing expenses for new membrane procurement and waste membrane disposal,thereby enhancing the economic benefits of enterprises.关键词
渗滤液/纳滤(NF)膜/阻垢剂优化/直接再回用/膜使用寿命Key words
leachate/nanofiltration(NF) membrane/scale inhibitor optimization/direct reutilization/service life of membrane分类
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秦胜男,缪春霞,张美兰..纳滤阻垢剂优化与废膜直接再回用试验[J].净水技术,2025,44(5):149-158,10.基金项目
上海城投环境(集团)有限公司科研项目:老港渗沥液处理设施运行分析及运行能效提升技术研究(2021/CH/LG-06) （集团）
