移动床生物膜反应器SHARON工艺半亚硝化特性

采用移动床生物膜反应器（MBBR）对城市垃圾渗滤液进行SHARON工艺研究。主要研究了该反应器的启动情况和氨氮浓度、溶解氧（DO）以及pH等因素对反应器半亚硝化效果的影响。结果表明，在控制HRT=1 d、温度30℃、DO=0.5～1.0 mg·L^-1、pH=7.5左右、无污泥回流等条件下，经过4周的运行，成功地选择培养出亚硝化型生物膜，实现了短程硝化。研究表明通过控制进水氨氮浓度、DO和pH，可以达到出水半亚硝化的处理效果。当进水氨氮浓度为500 mg·L^-1时，出水半亚硝化的控制条件是pH=7.0，DO=1.5 mg·L^-1;而在进水氨氮浓度为300 mg·L^-1时，控制pH=7.0，DO=1.0 mg·L^-1，出水也可实现半亚硝化。最大可能计数法（MPN）测定发现，亚硝化菌在数量上的绝对优势是反应器能始终保持高效稳定的亚硝氮积累的主要原因。

Half-nitrosofication in SHARON process using moving bed biofilm reactor

The SHARON process was used to remove ammonium nitrogen from landfill leachate with moving bed biofilm reactor (MBBR).The start-up of biofilm reactor and the affecting factors on half-nitrosofication were investigated.Nitrosobacteria was selectively cultivated on the biofilm and short-cut nitrification was achieved in 4 weeks by controlling the following conditions as HRT=1 d, DO=0.5—1.0 mg·L^-1, pH of about 7.5, T=30℃ and no sludge recycle.The experimental results showed that when the influent ammonium concentration was 500 mg·L^-1, half-nitrosofication could be achieved at pH of 7.0 and DO of 1.5 mg·L^-1 and when the influent ammonium concentration was 300 mg·L^-1, half-nitrosofication could be achieved at pH of 7.0 and DO of 1.0 mg·L^-1.The most probable number (MPN) measurement showed that the overwhelming quantity of nitrosobacteria immobilized on biofilm was the main reason for stable and high nitrite accumulation in the reactor.