膜电容去离子技术用于污水处理厂尾水的脱盐试验研究

Experimental Study on Desalination of Tail Water from Wastewater Treatment Plant by Membrane Capacitive Deionization Technology

为探究膜电容去离子(Membrane Capacitive Deionization, MCDI)技术处理工业园区尾水的脱盐性能及适宜的工艺参数,利用MCDI技术处理安徽某工业园区污水处理厂尾水,考察进水流量、充电电流、充电电压等工艺参数对以活性炭为电极材料的MCDI装置脱盐性能的影响。结果表明:在处理工业园区尾水时,该技术适宜的主要运行条件为进水流量5 L/min~7 L/min、充电电流110 A~130 A、充电电压1.10 V~1.20 V;在进水流量为5 L/min、充电电流为130 A、放电电流为160 A、充电电压为1.20 V、放电电压为0.15 V时,进水电导率为2 044.00μs/cm,产水电导率为952.00μs/cm,进水TDS为1 556.00 mg/L,产水TDS为628.00 mg/L,电导率去除率为53.42%,产水率为34.42%,此时测算出的电耗为0.74 kW·h/t,产水主要水质指标符合GB/T50050-2017《工业循环冷却水处理设计规范》间冷开式循环冷却水系统补充水的要求。

In order to investigate the desalination performance and suitable process parameters of membrane capacitive deionization(MCDI)technology for tail water treatment in industrial parks, the tail water of a wastewater treatment plant in an industrial park in Anhui Province was treated by MCDI technology. The effect of process parameters such as influent flow, charging current and charging voltage on the desalination performance of MCDI device with activated carbon as electrode material were investigated. The results showed that the suitable operating conditions for the treatment of industrial park tail water are inlet flow 5 L/min~7 L/min, charging current 110 A~130 A and charging voltage 1.10 V~1.20 V. When the inlet flow is 5 L/min, the charging current is 130 A, the discharge current is 160 A, the charging voltage is 1.20 V, and the discharge voltage is 0.15 V, the inlet conductivity is 2 044.00 μs/cm, the water production conductivity is 952.00 μs/cm, the inlet TDS is 1 556.00 mg/L, and the water production TDS is 628.00 mg/L. The removal rate of conductivity is 53.42%, and the water production rate is 34.42%. At this time, the estimated hydropower consumption perton is 0.74 kWh/t. The main water quality indexes of water production meet the requirements of GB/T 50050-2017 Code for design of industrial recirculating cooling water treatment replenishment water of intercooling open circulating cooling water system.