ABS树脂废水生物处理工艺脱氮效果的强化

Enhancing the nitrogen removal efficiency of biological treatment process for ABS resin wastewater

为进一步提高ABS树脂废水生物处理工艺的脱氮效果,对原缺氧区的设备进行改进和优化。针对原有工艺缺氧区溶解氧含量较高,系统脱氮效果不佳等问题,设计了在缺氧区放置两台水力循环搅拌器以及投加碳源的实验方案。对比分析了微孔曝气头微曝气、水力循环搅拌器循环以及投加碳源等3种情况的脱氮效果。实验结果表明,缺氧区采用微孔曝气头微曝气,系统脱氮效果差,总氮(TN)去除率平均值为19.80%;缺氧区放置水力循环搅拌器,系统脱氮效果提高,TN去除率平均值达到41.73%;进水投加乙酸钠后,系统的脱氮效果无显著提高,而COD去除率有所下降。

In order to further enhance the total nitrogen（ TN） removal efficiency of biological treatment process for ABS resin wastewater,the equipment of the original anoxic zone was improved and optimized. Aiming at the problems of the original process that the high DO value of the anoxic zone and the poor TN removal rate,an experimental scheme placing two hydraulic circulation agitators and adding external carbon substance was designed. The paper analyzed comparatively on the TN removal efficiency under the three conditions of aerating by microporous diffusers,cycling vertically by hydraulic circulation agitators and adding external carbon substance. The results indicated that when using microporous diffusers in the anoxic zone,the removal efficiency of TN was poor in the system with an average of 19. 80% TN removal rate; when placing hydraulic circulation agitators in the anoxic zone,the removal efficiency of TN had been improved with an average of41. 73%; when adding external carbon substance into the raw water,the removal efficiency of TN had not been improved significantly,while the chemical oxygen demand（ COD） removal efficiency decreased.