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Pretreatment of nonbiodegradable landfill leachate by air stripping coupled with agitation as ammonia stripping and coagulation–flocculation processes

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Abstract

A combination process has developed as a pretreatment of non biodegradable leachate. The processes consist of air stripping coupled with agitation as a modified of ammonia stripping followed by coagulation–flocculation processes. The main aims of these processes are reducing a concentration of NH3-N and organic matter as well as enhancing the biodegradability of landfill leachate. Ammonia stripped by the airflow rate of 10 L min−1 at pH 11 for 3 h, while the agitation process applied to air stripping effluent for 2 h at the pH of 11.5 in 150 s−1 gradient velocity. NH3-N was removed at 96 % as removal ratio by the modified ammonia stripping in 5 h stripping time. Ferric sulfate, poly ferric sulfate and aluminum poly chloride was tested as a coagulant material in the coagulation process. Chemical oxygen demand (COD), suspended solids (SS), turbidity as well as the sludge ratios were discovered for each material operated under optimum condition of pH and dosage. The overall removal of NH3-N, COD, biochemical oxygen demand, total organic carbon, and SS obtained by these processes were 96.5, 71.5, 56.5, 48.5, and 96.5 %, respectively, at the corresponding biodegradable ratio was modified from 0.20 to 0.31.

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Acknowledgments

This study was financially supported by the Hubei Provincial Science and Technology Department with grant No. 2006AA305A05. Mr Alkhafaji R. Abood thanks the Ministry of Higher Education and Thi-Qar University in Iraq for enabling him to purse a higher degree. He is also grateful to the China Scholarship Council (CSC) and China University of Geosciences (CUG) for the financial support of this research.

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Authors and Affiliations

  1. State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan, 430074, People’s Republic of China

    Alkhafaji R. Abood, Jianguo Bao, Dan Zheng & Chunlei Gao

  2. Thi Qar University, Nasiriyah, Iraq

    Alkhafaji R. Abood

  3. Al-Mustansiryiah University, College of Engineering, Baghdad, Iraq

    Zaidun Naji Abudi

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  1. Alkhafaji R. Abood
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  2. Jianguo Bao
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  3. Zaidun Naji Abudi
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  4. Dan Zheng
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  5. Chunlei Gao
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Correspondence to Jianguo Bao.

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Abood, A.R., Bao, J., Abudi, Z.N. et al. Pretreatment of nonbiodegradable landfill leachate by air stripping coupled with agitation as ammonia stripping and coagulation–flocculation processes. Clean Techn Environ Policy 15, 1069–1076 (2013). https://doi.org/10.1007/s10098-012-0575-1

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  • DOI: https://doi.org/10.1007/s10098-012-0575-1

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