提高猪场沼液净化处理效果的氨吹脱控制参数

针对畜禽养殖场沼气工程沼液氨氮浓度高,碳氮比不足,直接采用传统生化污水处理法效果不佳的问题,该文对氨吹脱工艺降低猪场沼液氨氮浓度参数进行了试验研究,探索了不同初始氨氮浓度、pH值、气液比、温度等参数对氨氮去除的效果,并进一步研究了Ca(OH)2的混凝作用。结果表明:初始氨氮质量浓度分别为500和900mg/L时,氨氮去除率无显著差异。在初始氨氮质量浓度为900mg/L,pH值为10.5,气液比(流量比)2000,沼液温度30℃的运行条件下,氨氮去除率较高为81.84%。在Ca(OH)2投加量为5.0g/L条件下,混凝沉淀效果较好,化学需氧量(COD)、总磷(TP)和PO43-去除率分别为30.13%、97.44%和98.76%,但总硬度提高了106%。该文研究结果为开发沼液深度处理工艺提供了数据。

Ammonia stripping control parameters for improving effluent treatment effect in anaerobic digesters of piggery wastewater

Effluent from anaerobic digesters,which contains high ammonium concentration and with low C/N ratio,can not be treated effectively by using traditional biochemistry methods.In this study,ammonia stripping was used to decrease ammonium concentration in effluent from anaerobic digesters of piggery wastewater.Influences of initial ammonium concentration,pH value,air flow to liquid flow ratio,temperature on ammonia removal rate were studied.The coagulation effect of Ca(OH)2 was further explored.The results showed that the initial ammonium concentration of 500 or 900 mg/L had no significant difference on the ammonia removal rate;Ammonia removal rate could achieve 81.84% at the experiment condition with initial ammonium concentration of 900 mg/L,pH value of 10.5,air to liquid ratio of 2000,and temperature of 30℃.A dose of Ca(OH)2 5 g/L performed a good coagulation effect,the removal rates of COD TP and PO43-were 30.13%,97.44% and 98.76%,respectively,but the hardness increased by 106%.The results can provide a reference for the development of advanced treatment of biogas plant effluent.