固定化生物流化床处理尿素厂废水的中试研究

Pilot-plant research on urea plant wastewater treatment by biological fluidized bed with immobilized microorganisms

采用O／A／O／A（好氧／缺氧／好氧／缺氧）工艺的固定化生物流化床处理技术，对尿素厂的氨氮废水（NH3-N50～500mg／L）进行了现场中试试验研究。试验结果表明：该技术处理尿素厂废水效率高，效果好，费用低；当水力停留时间平均为21h时，出水TN平均浓度为26．63mg／L，去除率为90%，出水NH3-N平均浓度为6．51mg／L，去除率可达96%。

Pilot-plant of O/A/O/A process in biological fluidized bed reactor with immobilized microorganisms was conducted to investigate the treatment of urea plant wastewater （with ammonia-nitrogen concentration of 50 to 500 mg/L）. The results show that the O/A/O/A process is effective and the cost is low. Removals of 90% and 96% were obtained for TN and ammonia-nitrogen respectively at condition when the hydraulic residence time in the immobilized fluidized bed is 21 hours. The final mean residual TN and ammonia-nitrogen in the effluent were 26. 63 and 6. 51 mg/L respectively.