采用芬顿高级氧化法对电石法PVC聚合釜洗釜废水进行了小试试验。结果表明:在pH值为3.5,反应时间为60 min,H 2 O 2∶COD(质量比)=1∶1,H 2 O 2∶Fe 2+(摩尔比)=3∶1的试验条件下,并兼顾COD去除率及运行成本的情况下,处理后的废水生物毒...采用芬顿高级氧化法对电石法PVC聚合釜洗釜废水进行了小试试验。结果表明:在pH值为3.5,反应时间为60 min,H 2 O 2∶COD(质量比)=1∶1,H 2 O 2∶Fe 2+(摩尔比)=3∶1的试验条件下,并兼顾COD去除率及运行成本的情况下,处理后的废水生物毒性得到大幅度降低,可生化性得到显著提升。后续采用以生化为主并引入其他保障处理工艺,最终出水COD可稳定在30 mg/L以下,各项指标满足厂内循环水冷却水回用要求。展开更多
The pyrolysis dechlorination of PVC (polyvinyl chloride) has been carried out by batch operation under atmospheric pressure. The kinetics involved in the PVC thermal decomposition was studied by using thermogravimetri...The pyrolysis dechlorination of PVC (polyvinyl chloride) has been carried out by batch operation under atmospheric pressure. The kinetics involved in the PVC thermal decomposition was studied by using thermogravimetric technique. Several tests were carried out at the heating rate of 5-10℃/min, the yields of products and the distribution of chlorine were also studied. The kinetic parameters such as activation energies, reaction orders and preexponential factors under nitrogen atmosphere were calculated by applying Friedman’s method. The results showed that the PVC thermal degradation is substantially a two-step process. The first step mainly involves dechlorination of the polymers. HCI is the main volatile product and this reaction can be seen as a first-order reaction. A kinetic model for the thermal dechlorination of PVC has been developed.展开更多
综述了含汞废水的常见处理方法。介绍了壳聚糖絮凝剂处理PVC生产中产生的含汞废水的效果,并与原有的沉淀法与过滤法相结合的方法进行比较。通过试验验证纳米Ti O2-ED T A(乙二胺四乙酸)接枝共聚改性后的壳聚糖絮凝剂处理含汞废水效果的...综述了含汞废水的常见处理方法。介绍了壳聚糖絮凝剂处理PVC生产中产生的含汞废水的效果,并与原有的沉淀法与过滤法相结合的方法进行比较。通过试验验证纳米Ti O2-ED T A(乙二胺四乙酸)接枝共聚改性后的壳聚糖絮凝剂处理含汞废水效果的优越性。展开更多
文摘采用芬顿高级氧化法对电石法PVC聚合釜洗釜废水进行了小试试验。结果表明:在pH值为3.5,反应时间为60 min,H 2 O 2∶COD(质量比)=1∶1,H 2 O 2∶Fe 2+(摩尔比)=3∶1的试验条件下,并兼顾COD去除率及运行成本的情况下,处理后的废水生物毒性得到大幅度降低,可生化性得到显著提升。后续采用以生化为主并引入其他保障处理工艺,最终出水COD可稳定在30 mg/L以下,各项指标满足厂内循环水冷却水回用要求。
文摘The pyrolysis dechlorination of PVC (polyvinyl chloride) has been carried out by batch operation under atmospheric pressure. The kinetics involved in the PVC thermal decomposition was studied by using thermogravimetric technique. Several tests were carried out at the heating rate of 5-10℃/min, the yields of products and the distribution of chlorine were also studied. The kinetic parameters such as activation energies, reaction orders and preexponential factors under nitrogen atmosphere were calculated by applying Friedman’s method. The results showed that the PVC thermal degradation is substantially a two-step process. The first step mainly involves dechlorination of the polymers. HCI is the main volatile product and this reaction can be seen as a first-order reaction. A kinetic model for the thermal dechlorination of PVC has been developed.
