Sulfate radical-advanced oxidation process (SR-AOP) for simultaneous removal of refractory organic contaminants and ammonia in landfill leachate
Sulfate radical-advanced oxidation process (SR-AOP) for simultaneous removal of refractory organic contaminants and ammonia in landfill leachate
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DOI：
10.1016/j.watres.2011.09.015
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发表时间：
2011-11-15
期刊：
影响因子：
12.8
通讯作者：
Ezyske, Casey M.
中科院分区：
文献类型：
--
作者：
Deng, Yang;Ezyske, Casey M.
通常，成熟的垃圾渗滤液含有高水平的不可生物降解的有机物和氨氮。同时去除这两种持久性浸漏液污染物是一项重大挑战。首次采用硫酸根（SO 4-）为基础的高级氧化工艺（SR-AOP）处理一个成熟的垃圾渗滤液，重点是同时去除难降解有机物和氨氮。在这项研究中，所有的实验都是在间歇式反应器中进行的，温度控制。在热过硫酸盐氧化（TPO）过程中，过硫酸盐（S2 O 82-）被热活化，产生强氧化剂SO 4-（E度= 2.6 V）。考察了初始pH值（3 ~ 8.3）、温度（27-50 ℃）和投加量（S2 O 82-：12 COD（0）= 0.25-2.0）对COD和氨氮去除率的影响。典型地，酸性pH（3-4）、较高温度和较高剂量有利于COD和氨的去除。在S2 O 82-：12 COD（0）= 2和50 ℃时，pH值为8.3（无pH调节）和4时COD去除率分别为79%和91%，氨氮去除率在pH值为8.3或4时均达到100%。SR-AOP似乎比基于羟基自由基（OH中心点）的高级氧化工艺（HR-AOP）更有利，因为OH。几乎不氧化氨。与芬顿法相比，在相同投加量下，TPO法处理同一批次渗滤液的COD去除率更高。当H_2O_2：2.125COD（0）= 2时，芬顿处理的COD去除率为40%，而当S_2O_8 ~（2-）：12 COD（0）= 2时，TPO处理的COD去除率为91%。这些结果表明，SR-AOP是一种很有前途的垃圾渗滤液处理方法。爱思唯尔有限公司出版
Typically, a mature landfill leachate contains high levels of non-biodegradable organics and ammonia nitrogen. Simultaneous removal of the both persistent leachate pollutants is a significant challenge. This paper reports the first scientific study to apply a sulfate radical (SO4-) - based advanced oxidation process (SR-AOP) to treat a mature leachate, with an emphasis of concurrent removal of refractory organics and ammonia. In this study, all the experiments were run in a batch reactor with temperature control. In the thermal persulfate oxidation (TPO) process, persulfate (S2O82-) was activated by heat to produce powerful oxidants, SO4- (E degrees = 2.6 V). Three factors affecting the removal efficiencies of chemical oxygen demand (COD) and ammonia nitrogen were investigated, including initial solution pH (3-8.3), temperature (27-50 degrees C), and chemical dose (S2O82-:12COD(0) = 0.25-2.0). Typically, acidic pH (3-4), higher temperature, and higher dose favored the removal of COD and ammonia. At S2O82-:12COD(0) = 2 and 50 degrees C, the COD removal rates were 79% and 91% at pH 8.3 (no pH adjustment) and 4, respectively; and the ammonia nitrogen removal reached 100% at pH 8.3 or 4. SR-AOP appears to be more advantageous over hydroxyl radical (OH center dot)-based advanced oxidation processes (HR-AOPs) because OH. almost does not oxidize ammonia. Furthermore, compared with Fenton treatment of the same batch leachate sample, the TPO could achieve a higher COD removal at an identical chemical dose. For example, COD removal was 40% at H2O2:2.125COD(0) = 2 during Fenton treatment (pH 3), but 91% at S2O82-:12COD(0) = 2 during TPO (pH 4). These findings demonstrate that SR-AOP is a promising landfill leachate treatment method. Published by Elsevier Ltd.