多级A/O工艺短程SND处理养猪沼液的工程调试

Commissioning of Shortcut Simultaneous Nitrification and Denitrification in Multilevel A/O for Swine Biogas Liquid Treatment

针对养殖污染负荷大,土地消纳面积不足,导致规模化养殖废水面源污染问题,依托常规多级A/O工艺,通过调控实现对规模化养猪沼液的短程同步硝化反硝化深度处理。重点考察不同溶解氧浓度搭配对多级A/O池去除COD和深度脱氮的影响。调试结果表明:在低溶解氧环境下可实现短程SND,其中正梯度溶解氧浓度工况对COD、TN的去除效果显著。顺反应流程多级A/O池各单元DO按梯度依次由缺氧升至1.1 mg/L(冬季为1.5 mg/L),系统出水COD、NH_3-N、TN分别为97.33、7.78、39.56 mg/L。整套设施对COD、TN的去除率分别为98.66%、93.43%,出水水质稳定实现COD<100 mg/L、NH_3-N<15 mg/L、TN<60 mg/L的工程目标。

To solve the non-point source pollution where the land isn＇ t enough for irrigating biogas liquid and in key river valleys, the effect of shortcut simultaneous nitrification and denitriiication （SND） in multilevel A/O for swine biogas liquid treatment was investigated. The results showed that SND could be achieved in low dissolved oxygen environment. Under the positive gradient condition, DO increased from anoxia to 1.1 mg/L（ 1.5 mg/L in winter）, the concentration of COD, NH3 - N and TN in effluent reached 97.33 mg/L, 7.78 mg/L and 39.56 mg/L respectively, and the total removal efficiency of COD and TN was 98.66% and 93.43%. And the effluent quality reached the expectations of COD 〈 100 rag/ L, NH3 -N〈15 mg/L, and TN〈60 mg/L.