Effect of anions interaction on the removal efficiency of nanofilters for the potable water treatment

Advances in environmental science and technology Pub Date : 2017-06-07 DOI:10.22104/AET.2017.470

Peyman Mahmoodi, M. Farhadian, A. Р. Nazar, R. Bashiri

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Abstract

The interaction between the ions and the charge of membranes can affect the efficiency of pollutant removal. The present study investigated the removal efficiency of hexavalent chromium and nitrate ions from both actual and synthetic contaminated water via two different commercial spiral wound polyamide nanofilters. In addition, the interaction of ions under different experimental conditions was investigated by using a Box-Behnken design (BBD). The Box–Behnken design optimized the contributing factors which included pH (5-9), the initial concentration of Cr (VI) (0.05-5 mg/L) and the initial concentration of nitrate (40-160 mg/L). The maximum removal efficiency of both Cr (VI) and nitrate was achieved at a pH of 9.0, as 99 % and 90 % for the Iranian nanofilter (NF-I) and 98 % and 82 % for the Korean nanofilter (NF-K), respectively. The results also indicated that as the initial concentration of Cr (VI) increased, the removal efficiency was enhanced while the removal efficiency of nitrate decreased according to the pH. However, by increasing the initial concentration of nitrate, the removal efficiency of both the Cr (VI) and nitrate increased. For actual water samples at an optimum pressure of 0.6 Mpa (NF-K) and 0.8 Mpa (NF-I), the removal efficiency of Cr(VI) and nitrate obtained was 95% and 76 % for the NF-K and 97 % and 86 % for the NF-I, respectively.

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阴离子相互作用对饮用水纳滤去除效率的影响

离子与膜电荷之间的相互作用会影响污染物的去除效率。本研究考察了两种不同的商用螺旋缠绕聚酰胺纳米过滤器对实际和合成污染水中六价铬和硝酸盐离子的去除效果。此外，采用Box-Behnken设计(BBD)研究了不同实验条件下离子的相互作用。Box-Behnken设计优化了pH(5 ~ 9)、Cr (VI)初始浓度(0.05 ~ 5 mg/L)和硝酸盐初始浓度(40 ~ 160 mg/L)的影响因素。在pH = 9.0时，Cr (VI)和硝酸盐的最大去除率分别为99%和90%，伊朗纳滤(NF-I)和韩国纳滤(NF-K)的去除率分别为98%和82%。随着初始浓度的增加，Cr (VI)的去除率提高，而硝酸盐的去除率随ph的增加而降低，但随着初始浓度的增加，Cr (VI)和硝酸盐的去除率均提高。在最佳压力为0.6 Mpa (NF-K)和0.8 Mpa (NF-I)的实际水样中，NF-K对Cr(VI)和硝酸盐的去除率分别为95%和76%，NF-I对Cr(VI)和硝酸盐的去除率分别为97%和86%。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Advances in environmental science and technology

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