Study on optimization of device operating parameters of hydrolysis acidification reactors treating Industrial salt-containing wastewater

The research was on the effect of the removal of COD, growth rate of VFA, and biodegradability of hard-biodegradable chemical industrial wastewater with high salinity caused by the device operating parameters of the three different hydrolysis acidification reactors. The results showed that the differences of biodegradability increase rate and COD removal was slight among the three different reactors. However, the difference of rising rate of VFA was great. The optimal inner loop proportion of the Up-Flow Reactor was 200%. In this case COD removal rate reached 20.0%, VFA growth rate reached 267%, and Biodegradability of sewage increased from 0.30 to 0.44. The best deflector angle of the baffled reactor was 60°. Under this condition, COD removal rate reached 16%, VFA growth rate reached 83%, and Biodegradability of Sewage increased from 0.30 to 0.40. The best Stirring speed of stratospheric style was 150r/min. In this way, COD removal rate reached 17%, VFA growth rate reached 167%, and Biodegradability of Sewage increased from 0.30 to 0.42. Comparing with the efficiency of mass transfer and the sludge properties, the Up-Flow Reactor was the best one of the three reactors because of its highest increase rate of VFA and the best ability of hydrolysis acidification to treat hard- biodegradable Sewage.