One of the major environmental concerns associated with waste disposal is the large amount of generated landfill leachates (LL), which are considered a type of wastewater with a complex composition. There is an urgent need to find an effective LL treatment method. LL were subjected to pretreatment followed by the Fe
0/H
2O
2 process. Pretreatment efficiency was coagulation at pH 6.0 >> coagulation at pH 9.0 > acidification at pH 3.0. Coagulation at pH 6.0 in an optimal Fe
3+ dose of 1000 mg/L decreased total organic carbon (TOC) from the initial concentration of 1061 mg/L to 491 mg/L while acidification to pH 3.0 decreased TOC to 824 mg/L. After acidification, the Fe
0/H
2O
2 process with 8000/9200 mg/L Fe
0/H
2O
2 reagent doses decreased TOC to 499 mg/L after a processing time of 60 min. Performance of the Fe
0/H
2O
2 process after coagulation at pH 6.0 for optimal Fe
0/H
2O
2 8000/5540 mg/L reagent doses decreased TOC to 268 mg/L (75% TOC removal). Treatment of landfill leachates with combined process coagulation and Fe
0/H
2O
2 also increased their susceptibility to biodegradation, expressed as the biochemical oxygen demand/chemical oxygen demand (BOD
5/COD) ratio from 0.13 to 0.43, allowing LL to be considered as susceptible to biodegradation. Fe
0/H
2O
2 process kinetics was described. A statistical analysis confirmed the obtained results. The proposed method can be successfully applied for LL treatment.
View Full-Text
►▼
Show Figures
This is an open access article distributed under the
Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited