Acta Scientiarum Naturalium Universitatis Pekinensis ›› 2017, Vol. 53 ›› Issue (3): 497-506.DOI: 10.13209/j.0479-8023.20175.044

• Orginal Article • Previous Articles     Next Articles

Treatment of Landfill Leachate Using A/O-Coagulation-BDD:Ⅰ. Parameter Optimization

Yingchun SHAN1, Qingwei WANG2, Weiyi PAN3, Wanzi SHI3, Haimei SUN3, Weiling SUN1()   

  1. 1. The Key Laboratory of Water and Sediment Sciences (MOE), College of Environmental Sciences and Engineering, Peking
    University, Beijing 100871
    2. Beijing Municipal Research Institute of Environmental Protection, Beijing 100037
    3. School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen Key Laboratory for Heavy Metal Pollution Control and Reutilization, Shenzhen 518055
  • Received:2016-02-02 Revised:2016-03-22 Online:2017-05-20 Published:2017-05-20

A/O-混凝-BDD组合工艺处理垃圾渗滤液的研究: 参数优化

单迎春1, 王庆玮2, 潘伟一3, 石宛梓3, 孙海美3, 孙卫玲1()   

  1. 1. 北京大学环境科学与工程学院, 水沙科学教育部重点实验室, 北京 100871
    2. 北京市环境保护科学研究院, 北京 100037
    3. 北京大学深圳研究生院环境与能源学院, 深圳市重金属污染控制与资源化重点实验室, 深圳 518055

Abstract:

Landfill leachate was treated by A/O-coagulation-BDD combined processes, and the operation parameters were optimized. The optimal HRT and sludge recirculation ratio was 10.7 days and 3.5 for A/O treatment process. Reaction pH and optimal dose of ferric chloride coagulation treatment was 5.5 and 0.4 g/L. The current density and A/V ratio (anode area/reaction volum) for best performance of BDD was 60 mA/cm2 and 4 m-1. CODCr concentration in raw leachte and final effluent were 13375 mg/L and 60 mg/L, with the removal efficiency of 99.5%. TOC concentration before and after treatment by combined treatment process were 6893 mg/L and 12 mg/L, with the removal efficiency of 99.8%. Ammonia nitrogen was completely removed by the combined treatment processes from 1889 mg/L to 0 mg/L. The contribution of A/O, coagulation, and BDD was 59.0%, 32.9%, and 7.6% for CODCr removal of total CODCr, was 50.5%, 46.1%, and 13.2% for TOC removal, was 84.3%, 2.5%, and 3.2% for ammonia nitrogen removal, respectively.

Key words: landfill leachate, A/O, coagulation, BDD, organic matter, ammonia nitrogen

摘要:

研究组合工艺“A/O-混凝-BDD”对垃圾渗滤液中有机物和氨氮的处理效果, 优化各段工艺的运行参数。结果表明, 各工艺最佳运行条件: A/O 工艺水力停留时间(HRT)为 10.7 d, 回流比为3.5; 混凝剂工艺氯 化铁为混凝剂, pH=5.5, 添加量为0.4 g/L; BDD工艺电流密度为60 mA/cm2, 电极面积/反应体积为4 m-1。最佳工艺条件下进、出水 CODCr 平均浓度分别为 13375 和60 mg/L, 去除率为99.5%; 进、出水 TOC 平均浓度分别为 6893 和 12 mg/L, 去除率为 99.8%。进、出水氨氮平均浓度分别为 1889 和 0 mg/L, 去除率为100.0%。A/O、混凝和 BDD 对 CODCr 去除贡献分别为 59.0%, 32.9%和 7.6%, 对 TOC 去除贡献分别为50.5%, 46.1%和13.2%, 对氨氮去除贡献分别为84.3%, 2.5%和3.2%。

关键词: 垃圾渗滤液, A/O, 混凝, BDD, 有机质, 氨氮