超声吹脱-次氯酸钠氧化工艺处理酮连氮法制肼废水

采用超声吹脱-次氯酸钠氧化工艺处理酮连氮法制肼废水,优化了工艺条件,并进行了尾水处理与盐分回收。实验结果表明:在超声声能密度0.08 W/mL、吹脱气量2 000 L/h、次氯酸钠溶液(有效氯10%)投加量15mL/L、反应时间20 min的最优条件下,COD、氨氮和肼类物质去除率分别达到96.97%、99.02%和96.60%,处理成本约为30元/t(以废水计);尾水经蒸馏处理后可满足GB 8978—1996《污水综合排放标准》的一级B标准,回收NaCl纯度为98.92%,达到GB/T 5462—2015《工业盐》的精制工业盐一级标准。

Treatment of wastewater from hydrazine hydrate preparation by ketazine method using ultrasonic stripping-sodium hypochlorite oxidation process

The wastewater from hydrazine hydrate preparation by ketazine method was treated using ultrasonic stripping-sodium hypochlorite oxidation process. The process parameters were optimized,and the tail water treatment and NaCl recovery were carried out. The experimental results showed that：Under the optimum conditions of ultrasonic sound energy density 0.08 W/mL,stripping gas amount 2 000 L/h,NaClO solution（effective chlorine 10%）amount 15 mL/L and reaction time 20 min,the removal rate of COD,ammonia nitrogen and hydrazine group substances were 96.97%,99.02% and 96.60% respectively,the treatment costs were about 30 yuan/t（wastewater）;The tail water after distillation met the first level B standards of GB 8978-1996. The purity of the recovered NaCl was 98.92%,which met the first level standard of GB/T 5462-2015 for refined industrial salt.