Organic removal by denitritation and methanogenesis and nitrogen removal by nitritation from landfill leachate
Organic removal by denitritation and methanogenesis and nitrogen removal by nitritation from landfill leachate
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垃圾渗滤液反亚硝化产甲烷去除有机物和亚硝化脱氮
DOI：
10.1016/j.watres.2007.08.041
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发表时间：
2008-02-01
期刊：
影响因子：
12.8
通讯作者：
Satoh, Hiroyasu
中科院分区：
文献类型：
--
作者：
Peng, Yongzhen;Zhang, Shujun;Satoh, Hiroyasu
采用两级UASB-缺氧-好氧反应器组合工艺强化垃圾渗滤液COD和氮的去除。为提高反硝化效率，将回用终出水的原渗滤液泵入一级UASB（UASB 1）进行同步反硝化产甲烷。180 d的试验结果表明，在A/O反应器的好氧区，UASB 1和UASB 2的最大有机物去除率分别为12.5和8.5 kgCOD m（-3）d（-1）。系统对COD和BODS的去除率分别为80-92%和99%左右。在不控制温度（17-30 ℃）和溶解氧（0.5-4.0mgL（-1））的条件下，NH_4 ~+-N的最大去除率为0.68kgNH_4 ~+-Nm（-3）d（-1），NH_4 ~+-N的去除率约为99%。在UASBI和A/O反应器的缺氧区通过完全反硝化获得81-93%的总氮去除率。荧光原位杂交（FISH）分析表明，NO反应器污泥中氨氧化菌（AOB）占真细菌总数的4%，而亚硝酸盐氧化菌（NOB）占真细菌总数的不到0.2%。研究表明，实现和维持亚硝化的主要因素是通过稀释回用终末出水获得合适的游离氨浓度范围，抑制NOB而不抑制AOB;通过pH曲线上的“氨谷”指示有效控制曝气时间;高效反硝化及其再生碱度使pH> 8.5。(c)2007爱思唯尔有限公司保留所有权利。
A system consisting of a two-stage UASB and anoxic-oxic reactor was used to enhance COD and nitrogen removal from landfill leachate. To improve denitrification efficiency, the raw leachate with recycled final effluent was pumped into the first-stage UASB (UASB1) to carry out simultaneous denitrification and methanogenesis. The results over 180 d show that the maximum organic removal rate in UASB1 and UASB2 was 12.5 and 8.5 kg COD m(-3) d(-1) in the oxic zone of the A/O reactor, respectively. The COD and biochemical oxygen demand (BODS) removal efficiency of the system was 80-92% and about 99%, respectively. Without controlling temperature (17-30 degrees C) and dissolved oxygen (0.5-4.0mgL(-1)), the maximum NH4+-N removal rate was 0.68kg NH4+-N m(-3) d(-1), and about 99% of NH4-N removal was obtained by nearly complete nitritation. The 81-93% total nitrogen removal was obtained by complete denitrification in the UASBI and in the anoxic zone of the A/O reactor. Fluorescence in situ hybridization (FISH) analysis of the sludge samples from NO reactor showed that ammonia oxidizing bacteria (AOB) consisted 4% of the eubacterium, while nitrite oxidizing bacteria (NOB) counted less than 0.2% of that. The study shows that the main factors achieving and maintaining nitritation are a proper range of free ammonia concentration obtained by dilution recycled final effluent that inhibits NOB but not AOB; effective control on aeration time by indication of "ammonia valley" on pH profile; and highly efficient denitrification and its reproducing alkalinity to result in pH above 8.5. (c) 2007 Elsevier Ltd. All rights reserved.