Stabilized landfill leachate treatment by coagulation-flocculation coupled with UV-based sulfate radical oxidation process

Ishak, Ahmad Razali and Hamid, Fauziah Shahul and Mohamad, Sharifah and Tay, Kheng Soo (2018) Stabilized landfill leachate treatment by coagulation-flocculation coupled with UV-based sulfate radical oxidation process. Waste Management, 76. pp. 575-581. ISSN 0956-053X

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Official URL: https://doi.org/10.1016/j.wasman.2018.02.047

Abstract

In this work, the feasibility of coagulation-flocculation coupled with UV-based sulfate radical oxidation process (UV/SRAOP) in the removal of chemical oxygen demand (COD) of stabilized landfill leachate (SLL) was evaluated. For coagulation-flocculation, ferric chloride (FeCl3) was used as the coagulant. The effect of initial pH of SLL and COD:FeCl3 ratio on the COD removal was evaluated. The result revealed that COD:FeCl3 ratio of 1:1.3 effectively removed 76.9% of COD at pH 6. The pre-treated SLL was then subjected to UV/SRAOP treatment. For UV/SRAOP, the sulfate radical (SR) was generated using UV-activated persulfate (UV/PS) and peroxymonosulfate (UV/PMS). The dosage of oxidant and reaction time were found to be the main parameters that influence the efficiency of COD removal. On the other hand, the effect of initial pH (3–7) and the type of oxidant (PS and PMS) was found to have no significant influence on COD removal efficiency. At optimum conditions, approximately 90.9 and 91.5% of COD was successfully removed by coagulation-flocculation coupled with UV/PS and UV/PMS system, respectively. Ecotoxicity study using zebrafish showed a reduction in toxicity of SLL from 10.1 to 1.74 toxicity unit (TU) after coagulation-flocculation. The TU remained unchanged after UV/PS treatment but slightly increased to 1.80 after UV/PMS treatment due to the presence of residual sulfate ion in the treated effluent. In general, it can be concluded that coagulation-flocculation coupled with UV/SRAOP could be a potential water treatment method for SLL treatment.

Item Type: Article
Uncontrolled Keywords: Chemical oxygen demand; Persulfate; Peroxymonosulfate; Ultraviolet radiation; Waste treatment
Subjects: Q Science > Q Science (General)
Q Science > QD Chemistry
Q Science > QH Natural history
Divisions: Faculty of Science > Dept of Chemistry
Faculty of Science > Institute of Biological Sciences
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 06 Aug 2019 01:44
Last Modified: 06 Aug 2019 01:44
URI: http://eprints.um.edu.my/id/eprint/21803

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