生物接触氧化工艺处理奶牛养殖废水参数优化研究

STUDY ON PARAMETERS OPTIMIZATION OF COWS BREEDING WASTEWATER BY BIOLOGICAL CONTACT OXIDATION PROCESS

针对奶牛养殖厂废水含有高浓度有机污染物的特点,采用快速挂膜法对生物接触氧化反应器进行启动,然后考察HRT、温度及气水体积比在生物接触氧化工艺处理奶牛养殖废水中对反应器运行效果的影响,以确定最佳运行参数。研究结果表明,生物接触氧化启动阶段,反应器对COD、氨氮、TP的去除率均有较大提升,且生物接触氧化对进水负荷有一定的抗冲击能力。实验阶段,系统DO含量为3～5 mg/L,水温为15～18℃,p H为6.5～7.5,HRT为48 h时,生物接触氧化对COD、氨氮和磷的平均去除率分别为91.5%、77.1%和53.4%。系统HRT为48 h,DO含量为3～5 mg/L,p H为6～8,运行温度为22℃时,系统COD、氨氮和磷的去除率分别为93.1%、87.5%和55.4%。系统HRT为48 h,水温为16～18℃,p H为6.5～7.5,气水体积比为45：1～55：1时,系统可保持较优的处理效率,COD、氨氮和磷的去除率分别为82%～88.4%、79.6%～86.6%、51.1%～52.4%。实验确定生物接触氧化最佳水力停留时间为48 h,运行温度为22℃,最佳气水体积比为45：1～55：1,以期为奶牛养殖废水处理提供设计依据和技术支持。

In order to improve the cows farm wastewater treatment effect and treatment efficiency, reduce the cows breeding wastewater pollution to the environment, for cows breeding wastewater containing high concentration of organic pollutants, the fast biofilm method was used to start the biological contact oxidation reactor, then the effects of HRT, temperature and gas water ratio on the reactor operation effect in biological contact oxidation process for the treatment of the reactor were studied, to determine the best operating parameters. The results showed that the biological contact oxidation stage, the reactor removal rates of COD, NH3-N and TP had greatly improved and biological contact oxidation had a certain impact resistance to the influent load. The experimental stage, when the system DO was 3～5 mg/L, water temperature was 15～18 ℃, pH was 6.5～7.5, HRT was 48h, the reactor average removal rates of COD, NH3-N and TP were 53.4%, 77.1% and 91.5% respectively. When the system HRT was 48h, DO was 3～5mg/L, pH was 6-8, operating temperature was 22 ℃, the reactor average removal rates of COD, NH3-N and TP were 93.1%, 87.5% and 55.4% respectively. When the system HRT was 48 h, temperature was 16-18, pH was 6.5～7.5 and the gas water ratio was 45：1～55：1, system could maintain the better processing efficiency, the removal rates of COD, NH3--N and TP were 82%～88.4%, 79.6%～86.6% and 51.1%～52.4% respectively. Test determined the biological contact oxidation optimal HRT was 48 h, operating temperature was 22 ℃, optimum gas water ratio is 45：1～55：1. To provide the design basis and technical support for the treatment of cow wastewater.