Yuan Jiang, Duan Jinming, Saint Christopher P, Mulcahy Dennis
a Key Laboratory of Northwest Water Resources, Environment and Ecology, MOE, School of Environmental and Municipal Engineering , Xi'an University of Architecture and Technology , Xi'an , People's Republic of China.
c Present address: Architectural Engineering Institute , Xinjiang University , Xinjiang , People's Republic of China.
Environ Technol. 2018 Jun;39(11):1384-1392. doi: 10.1080/09593330.2017.1329356. Epub 2017 Jun 19.
The removal of glyphosate and aminomethylphosphonic acid (AMPA) with synthetic water was carried out on a lab-scale nanofiltration unit using two membranes, NFX and NFW. The presence of humic acid and some inorganic matters (CaCl and NaCl) was tested in the experiment. The results demonstrate that NFX exhibits better separation performance than NFW. The herbicide filtration is found to have little effect on the permeate flux as compared to transmembrane pressure. Intermediate concentrations of NaCl act positively on foulant separation, and an increment of 3.3-5.4 percentage points in foulant rejection is obtained with the addition of 100 mg/L of NaCl. In Contrast, CaCl has negative effect on foulant separation during nanofiltration. Humic acid alone shows little influence on the rejection performance, whereas it is slightly improved in the coexistence of humic acid and CaCl. The nanofiltration technology proves to be a good approach to treat the problem of pesticide micropollution in a one-step process. This work clearly shows that the composition of the water matrices may influence the efficiency of the nanofiltration process in terms of the separation of the micropollutants.
在实验室规模的纳滤装置上，使用NFX和NFW两种膜对合成水中的草甘膦和氨甲基膦酸（AMPA）进行去除。实验中测试了腐殖酸和一些无机物（氯化钙和氯化钠）的存在情况。结果表明，NFX的分离性能优于NFW。与跨膜压力相比，除草剂过滤对渗透通量的影响较小。中等浓度的氯化钠对污染物分离有积极作用，添加100 mg/L的氯化钠可使污染物截留率提高3.3 - 5.4个百分点。相比之下，氯化钙在纳滤过程中对污染物分离有负面影响。单独的腐殖酸对截留性能影响不大，而在腐殖酸和氯化钙共存时截留性能略有改善。纳滤技术被证明是一步处理农药微污染问题的良好方法。这项工作清楚地表明，水基质的组成在微污染物分离方面可能会影响纳滤过程的效率。
