Nitrification reactions in treatment of supernatant from dewatering of digested sludge
Nitrification reactions in treatment of supernatant from dewatering of digested sludge
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DOI：
10.2175/106143097x125867
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发表时间：
1997-09-01
影响因子：
3.1
通讯作者：
Hultman, B
中科院分区：
文献类型：
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作者：
Mossakowska, A;Reinius, LG;Hultman, B
在斯德哥尔摩的Bromma污水处理厂研究了废水的硝化和消化污泥的脱水。在序批式反应器中试装置上进行了实验研究。结果表明，该反应器可获得较高的硝化速率，约为30 ~ 40 g NH 4-N/kg混合液挥发性悬浮物h.在硝化过程中，亚硝酸盐不断积累，直至反应器中铵态氮耗尽。当所有的铵都被氧化后，所有的亚硝酸盐都可以被完全氧化成硝酸盐。通过多变量分析，表明亚硝酸盐的积累主要是由初始氨氮浓度引起的，其次是氧浓度。硝化速率强烈依赖于氧浓度。硝化速率对氧浓度的强烈依赖性使得该过程易于通过使用氧浓度、空气流量和pH的测量来控制。
Separate nitrification of the discarded water from dewatering of digested sludge has been studied at the Bromma wastewater treatment plant in Stockholm. Experimental studies were carried out in a sequencing batch reactor pilot plant. It was shown that a high nitrification rare could be obtained in the reactor, approximately 30 to 40 g NH4-N/kg mixed liquor volatile suspended solids h. During the nitrification process, nitrite was accumulated until ammonium nitrogen was depleted in the reactor. When all ammonium had been oxidized, all nitrite could thereafter be completely oxidized to nitrate. By use of multivariate methodology, it was shown that nitrite accumulation was primarily caused by the initial concentration of ammonium and secondly by the oxygen concentration. The nitrification rate strongly depended on the oxygen concentration. The strong dependence of nitrification rates on oxygen concentration makes the process easy to control by using measurements of oxygen concentration, air flow, and pH.