Degradation of 2,4‐Dichlorophenol by Combining Photo‐Assisted Fenton Reaction and Biological Treatment
Degradation of 2,4‐Dichlorophenol by Combining Photo‐Assisted Fenton Reaction and Biological Treatment
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DOI：
10.2175/106143006x111664
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发表时间：
2006-06
影响因子：
3.1
通讯作者：
F. Momani;C. Sans;S. Contreras;S. Esplugas
中科院分区：
文献类型：
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作者：
F. Momani;C. Sans;S. Contreras;S. Esplugas
研究了光-芬顿反应对2，4-二氯苯酚(DCP)100 mg/L溶液生物降解性的改善作用。监测了5天和21天的生化需氧量(BOD)、BODn/化学需氧量(COD)和BODn/总有机碳(TOC)的比值、平均氧化状态和对活性污泥的抑制情况。在初始浓度为50 mg/L、初始浓度为10 mg/L、光-芬顿反应40min的条件下，可生化性由原来的0提高到0.18(BOD_5/COD=0.24)。在这一点上，从溶液中消除了所有的DCP。为了研究预处理步骤的影响，在两个半连续搅拌槽反应器中进行了预处理液的生物氧化试验，其中一个反应器采用活性污泥运行，另一个反应器采用生物驯化处理苯酚。结果表明，预处理液与城市污水共消化后，TOC的降解率可达80%以上。当好氧反应器的唯一碳源是经过处理的溶液时，有机碳的总去除量也达到了大约60%。生物反应器中使用的水力停留时间与国内污水处理厂中使用的水力停留时间相同(即12至24小时)。还进行了基于准一级动力学的动力学研究。总挥发物−1·h−1在0 6 7~1 7 L·g的范围内。
The photo‐Fenton reaction effect on the biodegradability improvement of 100 mg/L solution of 2,4‐dichlorophenol (DCP) has been investigated. Biochemical oxygen demand (BOD) at 5 and 21 days, BODn/chemical oxygen demand (COD) and BODn/total organic carbon (TOC) ratios, average oxidation state, and inhibition on activated sludge were monitored. For 50 mg/L hydrogen peroxide and 10 mg/L iron(II) initial concentrations and 40 minutes of reaction time in the photo‐Fenton process, the biodegradability of the pretreated solution, measured as BOD5/COD ratio, was improved from 0 for the original DCP solution up to 0.18 (BOD21/COD = 0.24). At that point, all DCP was eliminated from the solution. To study the effect of the pretreatment step, the biological oxidation of pretreated solutions was tested in two semicontinuous stirred tank reactors, one operated with activated sludge and one with biomass acclimated to phenol. Results showed that more than 80% TOC removal could be obtained by codigestion of the pretreated solution with municipal wastewater. Total organic carbon removals of approximately 60% were also obtained when the sole carbon source for the aerobic reactors was the pretreated solution. The hydraulic retention times used in the bioreactors were of the same order of magnitude as those used at domestic wastewater treatment plants (i.e., between 12 and 24 hours). Kinetic studies based on pseudo‐first‐order kinetics have also been carried out. Constants were found to be in range 0.67 to 1.7 L·g total volatiles suspended solids−1·h−1.