70℃高温水解/厌氧/好氧/BAC工艺处理高浓度有机废水

采用70℃高温水解酸化、高温厌氧、高温好氧、高温生物活性碳(BAC)组合工艺,对玉米深加工行业的高温工艺废水进行分相与分段处理研究,分别对COD、VFA、氨基酸等的去除处理效果进行研究和评价,在高温条件下完成高温高浓度有机废水的处理并达到回用热水、节能目的.结果表明:组合工艺系统对高浓度有机废水COD总去除率达到99.62%,VFA和氨基酸均为100%,出水COD<50mg/L,达到中水回用COD标准值,其中水解酸化相COD去除率占总去除率的49.7%,产甲烷相占33.7%,好氧段占14.5%,BAC段占1.1%;厌氧段占VFA总去除的56%,好氧段为21.2%,BAC段为21.8%;厌氧段占氨基酸总去除的34.8%,好氧段占62%,BAC段占3%.其中水解酸化有机负荷达到36.2kg/(m³·d).高温好氧和BAC组合工艺进水COD 3 500mg/L条件下,COD去除率仍能达到95.8%.整个系统运行平稳,抗冲负荷强,各段出水pH均在6.6～7.5之间波动.

Extreme thermophilic (70 degrees C), combining two-phase anaerobic/activated sludge/bio-activated charcoal for treating food wastewater

This study was conducted to investigate the performance of combining two-phase anaerobic(TPA)/activated sludge(AS)/bio-activated charcoal(BAC), seeded with mesophilic sludge, for treating food wastewater at extreme temperature (70 degrees C) to allow treated water to be reused for closed heat water circuits. The system had a total hydraulic retention time of 42h. Reactor performance was characterized by COD, VFA, pH, amino-acid. An overall COD treatment efficiency of 99.62%, VFA and amino-acide of 100% and pH between 6.6 - 7.5 were observed for the system. COD removal of acidification phase, methane phase, activated sludge and BAC was 49.7%, 33.7%, 14.5%, and 1.1%, respectively. VFA removal of methane phase, activated sludge and BAC was 56%, 21.2% and 21.8%, respectively. Amino-acid removal of methane phase, activated sludge and BAC was 34.8%, 62% and 3%, respectively. COD concentration of effluent in the system was lower than 50 mg/L. An additional experiments show that activated sludge and bio-activated charcoal at 70 degrees C may allow COD concentration of influent up to 3500 mg/L and COD removal was up to 95.8% at high organic loading 4.5 kg/(m3 x d) with aerobic condition.