煤化工优质再生水处理工艺优化研究

Study on treatment process optimization of high-quality recycled water in coal chemical industry

针对RO+混床工艺处理煤化工优质再生水的周期制水量与处理水库水相比明显偏低,影响回用锅炉补水问题进行了原因分析,并进行了RO+EDI工艺替换RO+混床工艺处理优质再生水的中试研究。试验结果表明:采取RO+EDI工艺处理优质再生水时,再生水回用率可从采用RO+混床工艺的30%提高至100%,产水电导率和硅含量达到相关锅炉进水标准要求,同时吨水产水成本可由1.63元降低至1.02元,工艺优势明显。

The product water of treating high-quality recycled water by the RO+mixed bed process in one cycle was significantly lower than that of treating reservoir water,affecting the boiler water makeup.In response to the above problem,the reasons for the low periodic water production volume when treating high-quality recycled water by the RO+mixed bed process were analyzed,and a pilot study was conducted on replacing the RO+mixed bed process with the RO+EDI process for treating high-quality recycled water.The test results showed that when the RO+EDI process was adopted to treat high-quality recycled water,the reuse rate of recycled water could increase from 30%to 100%,the electrical conductivity and silicon content of the produced water met the requirements of the relevant boiler feed water standards,and at the same time,the cost of water production per ton could be reduced from 1.63 yuan to 1.02 yuan,showing obvious process advantages.