OCO工艺处理屠宰废水

Slaughtering wastewater treatment by OCO process

屠宰废水不仅含有较高浓度的有机物,相比排放标准,氮的含量也较高。采用OCO工艺对屠宰废水进行生物除碳脱氮试验,在总水力停留时间约20h,厌氧区、缺氧区和好氧区水力停留时间分别为10、4、6h及控制OCO硝化区DO为3.0～4.0mg/L,处理出水的COD、氨氮及总氮等主要污染指标分别小于100、15、30mg/L,去除率分别达到90%、70%和50%,出水可以达到国家排放标准。研究表明,OCO工艺用于屠宰废水的生物除碳脱氮效果良好,可以作为屠宰废水处理的一个新工艺。

Usually,slaughtering wastewater is rich in organics and nitrogen,and sometimes nitrogen content is higher than discharge standard.OCO process was adopted to treat slaughtering wastewater in order to reduce nitrogen content.In the biological experiment of carbon removal and denitrification,when total hydraulic resident time（HRT） was 20h,the HRT of anaerobic zone,anoxic zone and aerobic zone in OCO reactor were 10h,4h and 6h respectively,and when dissolved oxygen（DO） concentration in aerobic zone was 3mg/L～4mg/L,the removal rates of COD,ammonia nitrogen and total nitrogen were respectively over 90%,70% and 50%,and each concentration in treated water were 100mg/L,15mg/L and 30mg/L,which had reached the national discharge standard.It was proved in experimental study that OCO process was efficient in biological removal of carbon and nitrogen,which could be a new technology for slaughtering wastewater treatment.