微电解—芬顿氧化工艺预处理高浓度松香改性酚醛树脂生产废水

Pretreatment of high concentration wastewater in rosin modified phenolic resin production by micro-electrolysis-Fenton oxidation process

为了降低松香改性酚醛树脂生产废水的COD并改善其可生化性,采用微电解—芬顿氧化工艺对该废水进行预处理。研究了pH、微电解反应时间、曝气、双氧水投加量等对微电解和芬顿氧化处理效果的影响,考察了COD去除率和BOD5/COD值的变化趋势。实验结果表明:曝气条件下,调节废水pH为4、进行2次微电解、微电解反应时间各2.0 h时,废水的COD去除率为38%,BOD5/COD值提高为0.18;再投加7.5%(w)的双氧水,废水的COD去除率为65.3%,BOD5/COD值为0.37。采用微电解—芬顿氧化的预处理工艺,不仅有效去除了废水的COD,而且显著改善了废水的可生化性。

In order to reduce the COD and improve the biodegradability of the rosin modified phenolic resin production wastewater,the micro-electrolysis-Fenton oxidation process was used for pretreatment.The effects of pH,microelectrolysis reaction time,aeration and hydrogen peroxide dosage on micro-electrolysis and Fenton oxidation were studied,and the trends of COD removal rate and BOD5/COD were investigated.The experimental results show that:The COD removal rate is 38%,and the BOD5/COD is increased to 0.18 when the wastewater pH is adjusted to 4,the micro-electrolysis is carried out twice for 2.0 h respectively;With the addition of 7.5%(w)hydrogen peroxide,the COD removal rate is increased to 65.3%and the BOD5/COD to 0.37.By the pretreatment process of micro-electrolysis-Fenton oxidation,not only the COD of the wastewater can be effectively removed,but also the biodegradability of the wastewater can be significantly improved.