强效电化学-臭氧耦合工艺的渗滤液深度处理特性
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1.西安建筑科技大学安德学院;2.西安建筑科技大学资源工程学院;3.西安交通大学人居环境与建筑工程学院

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国家自然科学基金面上项目(52070151);国家自然科学基金面上项目(52170052);陕西省重点研发计划(2021ZDLSF05-06)


Leachate Advanced Treatment Characteristics of Powerful Electrochemical-Ozone Coupling Process
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Affiliation:

1.Xi'2.'3.an University of Architecture and Technology XAUAT UniSA An De College;4.an University of Architecture and Technology School of Resources Engineering;5.an Jiaotong University School of Human Settlement Environment and Civil Engineering

Fund Project:

National Natural Science Foundation of China (No. 52070151, 52170052); Key Research and Development Project of Shaanxi Province(2021ZDLSF05-06)

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    摘要:

    以垃圾渗滤液二级出水非膜法深度处理为目的,本文构建了以复合式阴极和形稳阳极为核心的强效电化学反应单元,其中复合式阴极由磁铁棒、碳毡和铁粉组成,起到Fe2+的析出和渗滤液中硝态氮的还原,形稳阳极为商用Ti/RuO2-IrO2电极,起到活化渗滤液中Cl-,产生活性氯,氧化去除渗滤液中氨氮和有机物的作用,并将二者的强效电化学反应与臭氧氧化作用于同一单元,构建了强效电化学-臭氧耦合工艺,以此强化渗滤液二级出水有机物和总氮的去除。结果表明耦合工艺在电流强度为1.5 A,初始pH为7,铁粉吸附密度为0.42 g/cm2,臭氧投加量为4.58 mg/min时,对COD及TN的去除率分别为46.5%和79.81%。通过红外光谱(FT-IR)、电子顺磁共振波谱(EPR)、循环伏安曲线(CV)探究了工艺对有机物反去除机理,结果表明,耦合工艺中产生了·OH与·Cl多种活性物质,强化了渗滤液中脂肪族、酯、醚、酚等有机物的去除,提高了渗滤液的可生化性。耦合工艺与SBR小型生化系统联用后出水达到《生活垃圾填埋场污染控制标准》(GB 16889—2008)要求。

    Abstract:

    In order to achieve the purpose of non-membrane advanced treatment of landfill leachate secondary effluent, a powerful electrochemical reaction unit is constructed with a composite cathode and a dimensionally stable anode (DSA) as the core. The composite cathode is synthesized from carbon felt and iron powder by magnetic adsorption. The composite cathode would precipitate iron-based coagulants and reduce nitrate nitrogen in the leachate. The anode is a Ti/RuO2-IrO2 electrode, which can activate Cl- in the leachate to generate active chlorine and oxidize and remove ammonia nitrogen in the leachate. The powerful electrochemical reaction and ozone oxidation is applied in the same unit, and a powerful electrochemical-ozone coupling process is constructed to strengthen the removal of organic matter and total nitrogen in the secondary effluent of the leachate. The results show that when the current intensity is 1.5 A, the initial pH is 7, the adsorption density of iron powder is 0.42 g/cm2, and the ozone dosage is 4.58 mg/min, the removal rate of COD is 46.5%, and the removal rate of TN is 79.81%. Through infrared spectroscopy (FT-IR), electron paramagnetic resonance spectroscopy (EPR), and cyclic voltammetry (CV), the reaction mechanism of the process for the removal of organics was explored. The results showed that ·OH and ·Cl were generated in the coupled process system. A variety of active substances enhance the removal of aliphatic, ester, ether, phenol and other organic substances in the leachate. After the coupling process is combined with the small SBR biochemical system, the effluent meets the requirements of the "Standards for Pollution Control of Domestic Waste Landfills" (GB 16889-2008).

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  • 收稿日期:2023-01-08
  • 最后修改日期:2023-02-13
  • 录用日期:2023-02-15
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