收稿日期: 2024-01-29
网络出版日期: 2024-03-23
基金资助
天津市科技特派员项目(22YDTPJC00700)
Study on ultrafiltration+nanofiltration double membrane treatment of iron process iron phosphate production wastewater
Received date: 2024-01-29
Online published: 2024-03-23
以铁粉和磷酸为原料的磷酸铁生产工艺因其废水排放量小、环保压力小逐渐成为主流的磷酸铁生产工艺。为进一步实现清洁生产、回收利用磷酸的目的，研究了“超滤+纳滤”双膜处理系统对磷酸铁生产工艺废水进行深度处理的可行性，并考察了进水压力、温度对纳滤膜分离性能的影响。结果表明：采用“超滤＋纳滤”的集成工艺处理以铁粉和磷酸为原料的磷酸铁生产废水，超滤产水化学需氧量（COD）的去除率为72%，固体悬浮物（SS）的去除率为79%，纳滤对各金属阳离子的截留率均在96%以上，且磷酸渗透双膜效果较好，磷酸的截留率在5%以内，最终通过纳滤滤过液能得到净化后的磷酸，实现磷酸的回用；运行中的超滤预处理能够显著减轻纳滤膜污染，并提升纳滤膜的清洗效果，延长了纳滤膜使用寿命。此外，通过单因素实验得出纳滤的最佳操作条件为：进水压力为0.4 MPa、温度为30 ℃。该研究结果为实现磷酸铁生产废水的磷酸资源化回用奠定了技术基础，具有较好的推广前景。
黄昭杰 , 赵晓旭 , 王海涛 , 常娜 , 张国欣 , 解永磊 , 尹延梅 , 路娜 , 王威 . 超滤+纳滤双膜法处理铁法磷酸铁生产废水的研究[J]. 无机盐工业, 2024 , 56(11) : 145 -150 . DOI: 10.19964/j.issn.1006-4990.2024-0058
The production process of iron phosphate with iron powder and phosphoric acid as raw materials has gradually become the mainstream production process of iron phosphate because of its small wastewater discharge and low environmental protection pressure.In order to further realize the purpose of clean production and recycling of phosphoric acid，the feasibility of ‘ultrafiltration+nanofiltration’ double membrane treatment system to deeply treat the wastewater produced by this process was studied，and the influence of inlet pressure and temperature on the separation performance of nanofiltration membrane was examined.The results showed that the integrated process of ‘ultrafiltration+nanofiltration’ was used to treat the wastewater from iron phosphate production with iron powder and phosphoric acid as raw materials.The removal rates of COD and SS in ultrafiltration effluent were 72% and 79%，respectively.The rejection rates of various metal cations by nanofiltration were all above 96%.The effect of phosphoric acid permeation double membrane was better，and the rejection rates of phosphoric acid were all within 5%.Finally，the purified phosphoric acid could be obtained from the nanofiltration filtrate and the phosphoric acid could be reused.The ultrafiltration pretreatment in operation could significantly reduce the pollution of nanofiltration membrane，improve the cleaning effect of nanofiltration membrane，and prolong the service life of nanofiltration membrane.In addition，the optimal operation condition of nanofiltration in single factor experiment was：water inlet pressure was 0.4 MPa and temperature was 30 ℃.The results of this study had laid a technical foundation for the realization of phosphoric acid resource recycling of iron phosphate production wastewater，and had a good promotion prospect.
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