不同进水方式下水温对AAOA—膜生物反应器工艺运行效果的影响

Effect of water temperature on performance of AAOA-MBR process operated under different feed modes

对昆明市某污水处理厂的AAOA—膜生物反应器(MBR)工艺在单、多点进水方式下的实际运行数据进行对比分析,探索了进水水温对不同进水方式下处理效果的影响。结果表明:单、多点进水方式下COD去除率均随着水温的升高而降低,但多点进水方式下COD去除率下降趋势更大,落差达到4百分点。水温低于18℃的情况下,多点进水方式对氨氮的去除效果劣于单点进水方式;当水温为12℃时,多点进水方式的出水氨氮存在超标风险。从整套工艺的处理效果来看,由于多点进水方式对碳源进行了合理分配,其TN去除率随水温升高而逐渐升高,呈现出与单点进水方式相反的趋势。

The actual operation data of single-influent and multiple-influent system in AAOA-membrane bioreactor（MBR）process were comparative analyzed based on a Kunming wastewater treatment plant.The treatment effect of water temperature on these two feed modes was explored.The results showed that the COD removal rates in single-influent and multiple-influent system both decreased with the increase of water temperature,while a bigger decrease of COD removal rate（up to 4 percent points）was found in multiple-influent system.When water temperature was below 18℃,the ammonia nitrogen removal rate of multiple-influent system was inferior to single-influent system and the exceeding risk of ammonia nitrogen amount existed in the effluent of multiple-influent system when water temperature was 12℃ during the test process.From the treatment effect of the system,the TN removal rate of multiple-influent system gradually increased with the water temperature rose due to reasonable distribution of carbon source in water.However,the single-influent system presented an opposite trend.