论文部分内容阅读
采用臭氧氧化技术对低浓度的聚氯乙烯(PVC)离心母液废水进行了预处理,分别考察了臭氧投加量、pH、初始温度及臭氧停留时间对废水中的水溶性高分子物质聚乙烯醇(PVA)及COD去除效率的影响,并在此基础上通过正交实验确定了废水中PVA和COD处理的最佳实验条件。研究结果表明,当反应时间为20 min,初始温度为30℃,臭氧发生器的脉冲密度为25%,pH值为7,通气流量为100 L/h时,COD和PVA的去除效率最高,分别为(72.6±2)%和(85.8±0.2)%,处理后的COD与PVA浓度分别为48.7和0.36 mg/L。此时的臭氧投加量为(4.2±0.2)g/L。废水的BOD5/COD值也从0.26提高到0.46,显著提高了废水的可生化性。此外,废水中的氨氮和浊度也得到了一定程度的去除,解决了离心母液废水后续深度处理——膜处理时存在的膜堵塞问题。
Ozone oxidation technology was used to pretreat low concentrations of polyvinyl chloride (PVC) mother liquor wastewater. The effects of ozone dosage, pH, initial temperature and ozone residence time on the water-soluble polymers of polyvinyl alcohol (PVA) and COD removal efficiency. On this basis, the optimum experimental conditions for the treatment of PVA and COD in waste water were determined by orthogonal experiments. The results showed that the COD and PVA removal efficiencies were the highest when the reaction time was 20 min, initial temperature was 30 ℃, ozone generator pulse density was 25%, pH value was 7 and aeration flow rate was 100 L / h (72.6 ± 2)% and (85.8 ± 0.2)%, respectively. The COD and PVA concentrations after treatment were 48.7 and 0.36 mg / L, respectively. The dosage of ozone at this time is (4.2 ± 0.2) g / L. The BOD5 / COD of wastewater also increased from 0.26 to 0.46, significantly improving the biodegradability of wastewater. In addition, the ammonia nitrogen and turbidity in wastewater were also removed to a certain extent, which solved the membrane plugging problems during the subsequent deep treatment of wastewater from mother liquor of the centrifugal mother liquor-membrane treatment.