Cheng, Sze Yin and Show, Pau-Loke and Juan, Joon Ching and Chang, Jo-Shu and Lau, Beng Fye and Lai, Sai Hin and Ng, Eng Poh and Yian, Haw Choon and Ling, Tau Chuan (2021) Landfill leachate wastewater treatment to facilitate resource recovery by a coagulation-flocculation process via hydrogen bond. Chemosphere, 262. ISSN 0045-6535, DOI https://doi.org/10.1016/j.chemosphere.2020.127829.
Full text not available from this repository.Abstract
Recent trend to recover value-added products from wastewater calls for more effective pre-treatment technology. Conventional landfill leachate treatment is often complex and thus causes negative environmental impacts and financial burden. In order to facilitate downstream processing of leachate wastewater for production of energy or value-added products, it is pertinent to maximize leachate treatment performance by using simple yet effective technology that removes pollutants with minimum chemical added into the wastewater that could potentially affect downstream processing. Hence, the optimization of coagulation-flocculation leachate treatment using multivariate approach is crucial. Central composite design was applied to optimize operating parameters viz. Alum dosage, pH and mixing speed. Quadratic model indicated that the optimum COD removal of 54% is achieved with low alum dosage, pH and mixing speed of 750 mgL(-1), 8.5 and 100 rpm, respectively. Optimization result showed that natural pH of the mature landfill leachate sample is optimum for alum coagulation process. Hence, the cost of pH adjustment could be reduced for industrial application by adopting optimized parameters. The inherent mechanism of pollutant removal was elucidated by FTIR peaks at 3853 cm(-1) which indicated that hydrogen bonds play a major role in leachate removal by forming well aggregated flocs. This is concordance with SEM image that the floc was well aggregated with the porous linkages and amorphous surface structure. The optimization of leachate treatment has been achieved by minimizing the usage of alum under optimized condition. (C) 2020 Elsevier Ltd. All rights reserved.
| Item Type: | Article |
|---|---|
| Funders: | University of Malaya under SATU Joint Research Scheme (ST022-2019), University of Malaya under SATU Joint Research Scheme (ST014-2018), Impact Oriented Interdisciplinary Research Grant (IIRG004A-19IISS), Impact Oriented Interdisciplinary Research Grant (RP025B-SUS18), Ministry of Education, Malaysia (FRGS/1/2019/STG05/UNIM/02/2), Ministry of Education, Malaysia (MyPAIR/1/2020/STG05/UNIM/1) |
| Uncontrolled Keywords: | Alum; Central composite design (CCD); Coagulation-flocculation; Leachate; Mature landfill; Multivariate; Pretreatment |
| Subjects: | G Geography. Anthropology. Recreation > GE Environmental Sciences |
| Divisions: | Faculty of Engineering > Department of Civil Engineering Faculty of Science > Institute of Biological Sciences Deputy Vice Chancellor (Research & Innovation) Office > Nanotechnology & Catalysis Research Centre |
| Depositing User: | Ms Zaharah Ramly |
| Date Deposited: | 02 Sep 2022 01:24 |
| Last Modified: | 02 Sep 2022 01:24 |
| URI: | http://eprints.um.edu.my/id/eprint/34168 |
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