Concentrated landfill leachate treatment with a combined system including electro-ozonation and composite adsorbent augmented sequencing batch reactor process

• Published in: Process safety and environmental protection Vol. 111; pp. 253 - 262
• Main Authors: Mojiri, Amin, Ziyang, Lou, Hui, Wang, Ahmad, Zakiah, Tajuddin, Ramlah Mohd, Abu Amr, Salem S., Kindaichi, Tomonori, Aziz, Hamidi Abdul, Farraji, Hossein
• Format: Journal Article
• Language: English
• Published: Rugby Elsevier B.V 01.10.2017; Elsevier Science Ltd
• Subjects: Adsorbents; Batch reactors; Chemical oxygen demand; Color; Combined treatment; Composite adsorbent; Concentrated leachate; Electro-ozonation; Environmental impact; Independent variables; Landfill; Landfills; Leachates; Nickel; Organic chemistry; Ozonation; Ozone; Pollutants; Reaction time; Reactors; Response surface methodology; Reverse osmosis; RSM; SBR; Sequencing batch reactor; Studies; Waste disposal sites; Waste treatment; Wastewater treatment; Water pollution treatment; SBR; Concentrated leachate; Electro-ozonation; RSM; Composite adsorbent
• ISSN: 0957-5820; 1744-3598
• DOI: 10.1016/j.psep.2017.07.013

[Display omitted] •The electro-ozonation and adsorbent augmented SBR were used to treat concentrated landfill leachate.•RSM and CCD were utilized for optimization.•At the optimum condition for electro-ozonation reactor, removal efficacies of COD, color, and nickel were 64.8%, 90.4%, and 52.9%.•After treating at optimum performance, leachate was moved to PB-SBR which could improve removal efficiencies. A large volume of concentrated leachate is generated from leachate treatment via reverse osmosis. Concentrated leachate is a dark brown solution with high levels of pollutants. Treating concentrated leachate is extremely difficult, and thus, a combined treatment system is suggested. In the present study, concentrated landfill leachate was treated using a combined treatment technique that included electro-ozonation and a composite adsorbent augmented sequencing batch reactor (SBR) process. Central composite design and response surface methodology were utilized to investigate experimental data. Reaction time (30–120min) and ozone concentration (40–120mg/L) were selected as the independent variables. At an optimum reaction time (96.9min) and ozone dosage (120.0mg/L), the removal efficacies of chemical oxygen demand (COD), color, and nickel were 64.8%, 90.4%, and 52.9%, respectively, at original pH (7.3), as well as current and voltage of 4A and 9V, respectively. Ozone utilization ranged from 0.3kg to 1.4kg COD removed per kg ozone consumed. After treatment at optimum electro-ozonation performance, concentrated leachate was transferred to the powdered composite adsorbent (P-BAZLSC) augmented SBR reactor (PB-SBR). PB-SBR improved the removal efficiency for COD, color, and nickel from 64.8% to 88.2%, from 90.4% to 96.1%, and from 52.9% to 73.4%, respectively.