ZHOU Ming-fei,LIAN Kun-zhou,WANG Jing,et al.Efficiency Analysis of Desulfurization Wastewater Treated by Electrodialysis Technology[J].China Water & Wastewater,2020,36(21):80-86.
电渗析技术处理脱硫废水的效果分析
- Title:
- Efficiency Analysis of Desulfurization Wastewater Treated by Electrodialysis Technology
- 摘要:
- 脱硫废水水质复杂、含盐量高，是目前火电企业节水减排工作的难点。针对脱硫废水的特点，研究电渗析（ED）工艺处理脱硫废水的效果。结果表明，当循环流量为10 m3/h、电流密度为160 A/m2时，电渗析工艺可将溶解固形物（TDS）浓度约为50 g/L的脱硫废水浓缩至200 g/L左右，脱盐能耗最低为8.78 kW·h/m3；倒极可有效去除膜表面的沉积垢层，降低ED脱盐能耗；通过联合RO工艺可实现脱硫废水的两步脱盐，RO系统在50%回收率下脱盐率高于98%，产水中TDS为0.4 g/L，可用作循环水补充水、脱硫工艺用水等电厂其他系统的补水。
- Abstract:
- Desulfurization wastewater has the characteristics of complex water quality and high salinity, which is the difficulty of water saving and emission reduction in thermal power enterprises. According to the characteristics of desulfurization wastewater, the treatment effect of electrodialysis (ED) process on desulfurization wastewater was explored. When circulating flow and current density were 10 m3/h and 160 A/m2, ED could concentrate desulfurization wastewater with total dissolved solids (TDS) content of about 50 g/L to about 200 g/L, and the minimum desalting energy consumption was 8.78 kW·h/m3. The inverted pole could effectively remove the deposited scale layer on the membrane surface and reduce ED desalting energy consumption. Its combination with RO could achieve two-step desalting of desulfurization wastewater. The desalting rate of RO system was higher than 98% and TDS in effluent was 0.4 g/L under the condition of 50% recovery rate, which could be used as supplement water of the circulating water, desulfurization process water and other supplement water of the power plant.
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