Treatment of Leachate from Open Dumpsite of Municipal Solid Waste by Ozone Based Advanced Oxidation Process. (4th May 2022)

• Record Type: Journal Article
• Authors: Mohan, S.; Gokul, D.
• Is Part Of: Ozone: science and engineering. Volume 44:Number 3(2022)
• Page Start: 250
• Page End: 264
• Publication Date: 2022-05-04
• Subjects: Ozone -- leachate treatment -- advanced oxidation -- biodegradability -- municipal solid waste; Ozone -- Periodicals; 665.89
• DOI: 10.1080/01919512.2021.1919053
• Languages: English
• ISSNs: 0191-9512

Abstract

ABSTRACT: Open dumping of Municipal Solid Waste (MSW) results in generation of leachate that contains large amounts of organic matter, ammonia, heavy metals, chlorinated organics, phenolic compounds, phthalates, and pesticide residues which irreparably contaminate both surface and groundwater. Advanced Oxidation Processes (AOP) have been reported as one of the effective treatment methods, especially in improving the biodegradability of the leachate as well as effective in removing recalcitrant organics. With AOP pre-treatment rendered the leachate becomes more amenable to further treatment using biological treatment, adsorption, or ion-exchange processes. The study reported in this paper mainly aims at assessing the suitability of ozone and peroxone (O3 +H2 O2 ) based advanced oxidation processes (AOP) for the treatment of MSW leachate from the open dumpsite. The effect of reaction time, impact of O3 dose, and H2 O2 concentration on the efficiency of COD removal, improvement in the biodegradability of the leachate, and pH change were determined as the performance parameters for the treatment process. The maximum COD removal efficiency was found to be 46% and 82% with ozone alone (3975 mg/L) and with ozone (9275 mg/L) + 50 mg/L H2 O2 each with 120 min. reaction time. It is also found that the BOD5 /COD ratio has been increased from 0.09 to 0.58 at optimum O3 + 50 mg/L H2 O2 treatment would offer as an effective method for increasing the biodegradability.