A+A^(2)O工艺改为厌氧+两级AO工艺的总结

Summary of A+A^(2)O process changed to anaerobic+two-stage AO process

为使A+A^(2)O工艺出水水质达到国家排放标准,将它改造为厌氧+两级AO工艺。将A段曝气吸附池及厌氧池合并为厌氧池;中间沉淀池改为一级缺氧区;B段原厌氧区及缺氧区1/2改为一级好氧区;剩余1/2缺氧区及好氧区功能不变。改造后运行结果表明:处理水质虽达标,但需投大量碳源。为减少碳源投加,再次对工艺构筑物水力停留时间进行调整,减少曝气区HRT,增加缺氧区HRT,同时提高有效水深,运行结果表明,处理水质既达标又节省碳源。

In order to make the effluent quality of A+A^(2)O process meet the national discharge standard,it was transformed into anaerobic+two-stage AO process.The A section aeration adsorption tank and anaerobic tank were combined into an anaerobic tank.The intermediate sedimentation tank was changed into a first-stage hypoxia zone.In section B,the original anaerobic zone and half of the hypoxia zone were changed to the first-stage aerobic zone.The function of the remaining half of the hypoxic zones and aerobic zones remained unchanged.The results show that the water quality is up to standard,but a large amount of carbon sources are needed.In order to reduce the addition of carbon source,the hydraulic retention time of the process structures was adjusted again to reduce the HRT in the aeration zone,increase the HRT in the hypoxia zone,and increase the effective water depth.The results show that the water quality can meet the standard and add fewer carbon source.