溶解氧对垃圾压缩站废水同时硝化反硝化脱氮的影响

Effect of DO on Nitrogen Removal Efficiency by Simultaneous Nitrification/Denitrification of Wastewater from Waste-Compacting Station

溶解氧(DO)含量是实现同时硝化反硝化生物脱氮的关键因素之一.文中采用同时好氧厌氧生物反应器(SOA),对反应器内不同DO含量下垃圾压缩站废水中氨氮(NH4+-N),CODcr和总氮(TN)含量随时间的变化情况进行了考察.发现DO含量对反应器内CODcr,NH4+-N和TN的去除效率和效果均有较大的影响.在DO含量(质量浓度,下同)为1.0mg/L时,反应器内的氨氮去除可分为快速和慢速两个阶段.在DO含量为0.5mg/L时反应器内出现好氧区和厌氧区平衡状态,同时硝化反硝化脱氮效果最佳.反应器内可能存在一定的厌氧氨氧化脱氮过程.

Dissolved oxygen （DO） content is a key affective factor for the biological nitrogen removal by simultaneous nitrification and denitrification. In this paper, a simultaneous oxic/anaerobic bioreactor （SOA） was used to treat the wastewater from a waste-compacting station. The variations of ammonia nitrogen（ NH4^＋ -N）, CODCr and total nitrogen （TN） contents in the bioreactor with DO content were investigated. The results demonstrated that the removal efficiencies of NH4^＋-N, CODor and TN in the bioreactor were significantly affected by DO content. Two phases, namely, the fast phase and the slow phase of ammonia denitrification, can be observed at a DO content of 1.0mg/L. Moreover, when the DO content dropped to about 0. 5 mg/L, a balanced state of the aerobic area and the anoxic area in the SOA was achieved and an optimal simultaneous nitrification and denitrification efficiency was achieved as well. It was estimated that anaerobic ammonium oxidation （ANAMMOX） took place in the bioreactor to contribute to the nitrogen removal.