Leachate characterizations and pollution indices of active and closed unlined landfills in Malaysia

Hussein, Munirah; Yoneda, Kenichi; Zaki, Zuhaida Mohd.; Othman, Norhayani; Amir, Amnorzahira

doi:10.1016/j.enmm.2019.100232

Cited by 53 publications

(35 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Statistically significant differences were characterized for EC, COD, TKN, ON, AN, TS, TDS, TSS, sulfates, chlorides, sodium, potassium, calcium, magnesium and nickel. No significant differences were found between the concentrations of other heavy metals (copper, zinc, chromium, lead, cadmium), in spite of the changes observed in the literature following the age of the landfill [1]. Table 4 presents the results of the PCA for the chemical composition of leachate from active municipal waste landfills.…”

Section: Resultsmentioning

confidence: 96%

See 1 more Smart Citation

Differences in the Composition of Leachate from Active and Non-Operational Municipal Waste Landfills in Poland

Wdowczyk

Szymańska‐Pulikowska

2020

Water

View full text Add to dashboard Cite

Leachate formation is one of the many environmental hazards associated with landfilling. The leachate may migrate from the landfill to surface water and groundwater, posing a potential threat to aquatic ecosystems. Moreover, its harmful effect on human health and life has been proven. Due to the risks that landfill leachates may pose, it is necessary to control the state of the environment in their surroundings. The paper presents an example of the application of selected statistical methods (basic statistics, statistical tests, principal component analysis) to assess the impact of individual pollution indicators on the quality of landfill leachates. The conducted analysis showed the existence of significant differences between the surveyed active (Legnica, Jawor) and non-operational (Wrocław, Bielawa) landfills in Poland. These differences were especially visible in the cases of the following: electric conductivity (EC) (non-operational landfills 1915–5075 μS/cm, active 5093–11,370 μS/cm), concentrations of total Kjeldahl nitrogen (TKN) (non-operational landfills 0.18–294.5 mg N/dm3, active 167.56–907.4 mg N/dm3), chemical oxygen demand (COD), organic nitrogen (ON), ammonium nitrogen (AN), total solids (TS), total dissolved solids (TDS), total suspended solids (TSS), sulfates, chlorides, sodium, potassium, calcium, magnesium and nickel. Selected indicators should help to determine the progress of decomposition processes inside the landfill and the potential impact of leachate on the environment, and should be used in the mandatory monitoring of landfills.

show abstract

Section: Resultsmentioning

confidence: 96%

“…Leachate formation is one of the many environmental hazards associated with landfilling [1]. A leachate can be defined as a fluid that seeps through a landfill and is discharged from or contained in a landfill [2].…”

Section: Introductionmentioning

confidence: 99%

Differences in the Composition of Leachate from Active and Non-Operational Municipal Waste Landfills in Poland

Wdowczyk

Szymańska‐Pulikowska

2020

Water

View full text Add to dashboard Cite

show abstract

“…Due to lack of leachate collection and treatment facilities with no landfill gas capture infrastructure, most of the landfill sites are not categorised as sanitary landfills. Only few landfills in Malaysia have such facilities (Hussein et. al, 2019).…”

Section: Landfillmentioning

confidence: 99%

“…Treatment for leachate can be done using conventional method such as physicochemical treatment and biological treatment. Physicochemical treatment is advisable to treat the leachate with low BOD/COD ratios (<0.1) compared to biological treatment process which is only suitable for biodegradable organic materials that found in leachate (Hussein et al, 2019).…”

Section: Treatment Of Landfill Leachatementioning

confidence: 99%

“…It consists of a set of processes such as coagulation, flocculation and sedimentation which can be performed in single unit or separate unit. Example of this treatment is adsorption, reverse osmosis and chemically-aided post-treatment system (Hussein et al, 2019). On other hand, biological treatment is a system that usually uses bacteria, protozoa and another special microbe to treat the leachate.…”

Section: Treatment Of Landfill Leachatementioning

confidence: 99%

See 1 more Smart Citation

Review on landfill gas formation from leachate biodegradation

Japperi

Asri

Bakar

et al. 2021

MJCET

View full text Add to dashboard Cite

Landfill waste management is a very crucial procedure in handling Municipal Solid Waste (MSW) because it may create significant environmental issues if it is not managed properly. Landfill leachate and landfill gas (LFG) is part of the landfill waste management which triggered lot of researchers especially in terms of the environmental implications associated with the movement of the gasses during the waste constituents’ processes. Hence, this paper review is aiming to understand the behaviour of leachate itself as a decomposition agent in producing landfill gas (biogas). Biogas is naturally produced by anaerobic bacteria through anaerobic digestion which is affected by operating parameters and substrate characteristic. The results indicate that temperature, pH, and C/N ratio of leachate are the important factors that could increase the production of biogas with high content of methane. Furthermore, in terms of microbial activity during anaerobic digestion process, hydrogenotrophic and acetoclastic methanogen are the dominant substrate that contribute in producing methane gas as the final product. Firmicutes and Bacteroidetes are the common fermentative bacteria that had been found during fermentation process in hydrolysis and acidogenic phases. While, methanobacterial, methanococcal, methanomicrobial, methanosarcinal, and methanopyral are being classified as orders among 65 types of methanogenic archaea during methanogenesis stage. Overall, the relationships between operating parameters and microbial structure are important aspects that need to be considered in order to optimize the production of methane gas.

show abstract