New sequential treatment for mature landfill leachate by cationic/anionic and anionic/cationic processes: Optimization and comparative study

Sustainable treatment of landfill leachate

“…In contrast, old leachate ([10 years) is characterized by a relatively low chemical oxygen demand (COD) (\4,000 mg/L), slightly basic (pH [ 7.5) and low biodegradability (BOD 5 /COD \0.1) (Li et al 2010). Apart from that, humic and fulvic acid and NH 3 -N as well are greatly produced at this stage due to anaerobic decomposition (Bashir et al 2011). After landfilling period, BOD 5 content will be degraded during the stabilization stage.…”

Pretreatment of stabilized leachate using ozone/persulfate oxidation process

“…The PBLS is classified as a semi-aerobic stabilized landfill and has an area of 62.4 ha, of which 33 ha are currently operational, receiving approximately 2200 t of municipal solid waste daily. The site is equipped with a natural marine clay liner and three leachate collection ponds [27]. In the first 10 years of operation, from the 1980s until 1990, waste disposal suffered from lack of proper management and from inappropriate leachate control.…”

“…Using pH variation, Goi et al [9] achieved a COD removal rate ranging from 24% to 41% at pH varying from 4.5 to 11. However, the use of ozone and ozone in AOPs has a low ammonia removal efficiency, which exists in high levels in stabilized leachate and is extremely toxic to the environment and aquatic organisms [27]. Persulfate ðS 2 O 2À 8 Þ is the newest oxidant used in the chemical oxidation of groundwater and soil cleanup [28].…”

Simultaneous removal of COD and color from municipal landfill leachate using Ozone/Zinc Sulphate oxidation process

“…In recent years, several technologies have utilized to minimize the hazards of mature landfill leachate like coagulation/flocculation, adsorption using activated carbon, ion exchange, and advance oxidation techniques (Abu Amr and Aziz, 2012; Abu Amr et al, 2013;Bashir et al, 2011). Biological treatment is low cost and environmental friendly method for landfill leachate, when compare with the others treatment options (Bila et al, 2005).…”