【摘要】 浓盐水处理是煤化工废水处理实现近零排放的最后关键环节。采用三隔室双极膜电渗析装置,使纳滤产水在电渗析反应中制备酸碱溶液,并将其应用于煤化工锅炉给水工艺的树脂再生过程,最终实现浓盐水的资源化和零排放的目标。以制得的NaOH碱液浓度、产能、转化率、电流效率及能耗等评价指标,对电压和浓盐水含盐量等操作条件进行优化。探究操作条件对各评价指标的影响规律,并对制得的酸碱品质进行理论分析,最后分析该装置主要运行经济指标。试验结果表明,确定浓盐水总含盐量为6.472%,在电压为17.5V操作条件下恒压运行120min,制得碱和酸的浓度分别为3.260%和3.132%,达到树脂再生剂的浓度和品质要求。该运行条件下,转化率可达61.711%,能耗为4.944kW·h/kg,单位运行费用为114.418元/t碱。更多还原

【Abstract】 The concentrated brine treatment is the last key to achieve near-zero liquid discharge in coal chemical wastewater treatment.The three-septum bipolar membrane electrodialysis unit was used to prepare acid and alkali solution from the nanofiltration permeate,which applied to the resin regeneration process of the coal chemical boiler feedwater process.This technology could realize the goals of recycling the coal chemical brine and zero liquid discharge.The evaluation indexes including the concentration of NaOH solution,production capacity,conversion rate,current efficiency and energy consumption,were used to optimize the operating conditions such as voltage and brine salinity.Further the relationship of each influencing factor on the evaluation index was discussed and the quality of the acid and base was theoretically analyzed.Finally,the main operating economic indexes of the device are analyzed.The experiment results showed that the brine salinity was determined to be 6.472%,the operating voltage was 17.5 Vfor 120 min at the constant pressure mode,the concentration of alkali solution and acid solution was 3.260%and 3.132%respectively,which met the requirements of the resin regenerator.In this operation condition,the conversion rate could reach 61.711%,the energy consumption was 4.944 kW·h/kg,and the unit operating cost was 114.418 yuan/t.更多还原