两相厌氧工艺处理高浓度丙烯酸生产废水

Treatment of High-concentration Wastewater in Acrylic Acid Production by Two-Phase Anaerobic Process

利用两相厌氧工艺处理高浓度丙烯酸生产废水。实验结果表明：在较高进水COD和容积负荷的条件下,系统具有良好、稳定的处理效果;在负荷提高及稳定运行阶段,将生活污水与丙烯酸生产废水的体积比调整为5∶1,容积负荷最大提高至12.3 kg/（m3·d）,两相厌氧反应器可长期稳定运行,总COD去除率基本维持在90%以上,出水COD小于323 mg/L;当进水甲醛质量浓度为800~1 733 mg/L时,总甲醛去除率基本稳定在95.6%~99.3%;在负荷提高及稳定运行阶段,水解酸化相反应器和产甲烷相反应器的出水pH分别为6.2~7.6和7.6~8.1,出水总碱度分别为1 220~1 820 mg/L和1 800~2 620 mg/L。

High-concentration wastewater in acrylic acid production was treated by two-phase anaerobic process. The experimental results show that：The system can run steady with good effect under the conditions of high influent COD and volumetric loading;In the stages of loading increasing and stable running,when the volume ratio of domestic sewage to the wastewater is adjusted to 5∶1 and the volumetric loading is increased to 12.3 kg/（m3·d）,a long-term stable running of the system can be kept with above 90% of total COD removal rate and below 323 mg/L of effluent COD;When the influent formaldehyde mass concentration is 800-1 733 mg/L,the total formaldehyde removal rate is 95.6%-99.3%;In the stages of loading increasing and stable running,the pH of the effluents of hydrolytic acidification reactor and methanogenic reactor are 6.2-7.6 and 7.6-8.1 respectively,and the total alkalinities of them are 1 220-1 820 mg/L and 1 800-2 620 mg/L respectively.