包埋氨氧化细菌处理合成氨工业废水

Ammonia industrial wastewater treatment using immobilized ammonium oxidizing bacteria

以聚乙烯醇与海藻酸钠为载体,包埋固定氨氧化细菌(AOB),研究温度、DO、初始游离氨(FA)、有机物等影响因素对其短程硝化稳定性的影响。结果表明,25~30℃时载体中氨氧化细菌占优势;DO宜控制在4.0~5.5 mg/L之间,既能满足细菌生长所需,又不至过度曝气,造成载体间的摩擦增大,减少其使用寿命;载体耐氨氮负荷能力强,同时可以抵御有机物对氨氧化细菌的伤害;当初始FA>6.5 mg/L时,氨氧化细菌的活性将受到抑制;富集氨氧化细菌的污泥包埋后氨氮去除率降低了7.5%;包埋载体在确保短程硝化作用的同时,在内部形成的缺氧区可实现反硝化脱氮,提高了系统氨氮的处理能力。

In this study,the ammonia oxidizing bacteria( AOB) were immobilized by polyvinyl alcohol and sodium alginate. The effects of temperature,DO,free ammonia( FA),organic matter on the stability of partial nitrification were investigated. The results showed that ammonia oxidizing bacteria predominated in the carriers at25 ~ 30℃; DO should be controlled at 4. 0 ~ 5. 5 mg /L,it not only met the needs of bacterial growth,but also avoided excessive aeration. Otherwise it would increase the friction between the carriers,resulting in the reduction of theirs useful life. The carriers were strongly resistant to nitrogen loading rate,and also withstood the damage of organic matter to ammonia oxidizing bacteria. The activity of AOB was inhibited when initial FA concentration was over 6. 5 mg /L. After enriched ammonia oxidizing bacteria sludge had been embedded,the ammonia removal efficiency decreased about 7. 5%. In addition,anoxic zone was formed inside the carriers while ensuring partial nitrification process. Denitrification could be achieved in the anoxic zone,improving ammonia removal efficiency of the system.