Research On The Hydrolysis Acidification Pretreatment Of The Organic Wastewater

Based on general survey of the home and foreign study, a further research on anaerobic hydrolysis acidification process for organic wastewater was carried out in order to provide more effective theoretic basis and design advice to its industrial practice.Firstly, with the glucose used as the single energy source, the effects of HRT, pH and OL on anaerobic hydrolysis acidification process were studied. The experimental result showed that the optimum condition are pH=7.0 and the influent concentration of CODcr below 5000 mg/L, and the maximum acidification efficient (AE) and acidification degree (AD) were 44.6% and 64.6% respectively under the optimum condition. The kinetics parameters were Vmax=8.42/d and Ks=1256.83 mg/L.Then, the process was carried out to pretreat the soy sauce wastewater, and the result indicated that it can obviously improve the biodegradability of the wastewater and shorten the residence time of the aerobic process. Under the condition of pH=7.0 and HRT=4h, the BOD5/CODcr ratio of the soy sauce wastewater was improved from 0.34 to 0.52 and it can shorten the HRT 6 hours in the latter aerobic process.Moreover, for the pyridine wastewater, which was hardly degraded by the aerobic and the anaerobic treatment, the process was proved to be a good pretreatment method in this experiment. Under the condition of pH=6.0 and HRT=60h, the pyridine can be degraded completely at influent concentration below 50 mg/L and the percent conversion can reach 75.27% and 55.86% at the influent concentration of 102.7 mg/L and 198.4 mg/L , respectively.