Investigation of Liner Systems in Transport of Organic and Inorganic Contaminants in Sanitary Landfill: A Case Study

Abstract

In the present work, a pilot‐scale study was carried out to investigate the diffusive transport of phenolic compounds and advective transport of heavy metals through liner systems composed of alternative materials and to evaluate the leachate effect on liner materials’ properties. For this purpose, ten pilot‐scale landfill reactors were operated for a period of about 290 days. Physico‐chemical, mineralogical composition, and geotechnical properties of liner materials were also reported. The results of the study suggest that performance of alternative liner systems have no significant difference in toxic organic contaminant attenuation and clay‐lime mixture were found to be the less effected liner system by leachate. Thereby clay‐lime mixtures can be effectively utilized as a component of landfill liners due to not only chemical, physical, and mineralogical properties but also their high abundance and low cost supply. A two‐layer liner system composed of clay‐lime mixture at the upper part and bentonite‐zeolite mixture at the lower part is recommended. Existence of lime at the upper part will provide improvement in soil properties and reduce leachate effects but will increase hydraulic conductivity by decreasing the thickness of diffuse double layer. A bentonite‐zeolite mixture existing at the lower part will provide adsorption of heavy metals and avoid heavy metal migration.

Evaluation of clay soils’ permeability: A comparative study between the natural, compacted, and consolidated clay soils

“…Process formation continues with the presence of contaminants such as hazardous chemicals, pesticides, and heavy metals in the leachate. [3,4,5,6]. However, many organic substances are biodegradable and are further reduced by aerobic and anaerobic microorganisms [7].…”

“…Leachate includes various organic and inorganic compounds. Therefore, storage areas possess a threat to groundwater [6,15,16].…”

Kum Bentonit Karışımında Sızıntı Suyunun Hidrolik İletkenliğe Etkisi

“…Many studies have been conducted on impervious layer or barrier applications and filtration studies in landfills [1][2][3][4][5][6][7][8][9]. According to the data obtained from the studies to date, the desired properties of liners are low hydraulic conductivity, high adsorption capacity, resistance to changes in temperature and water content, suitable mechanical properties to ensure continuity during and after the construction phase, low cost and abundant availability.…”

“…Düzenli atık depolama sahalarında geçirimsiz tabaka ya da bariyer uygulamaları ve filtreleme çalışmaları ile ilgili birçok araştırma yapılmıştır [1][2][3][4][5][6][7][8][9]. Günümüze kadar yapılan çalışmalardan elde edilen verilere göre geçirimsiz tabakalarda olması istenen özellikler; düşük hidrolik iletkenlik, yüksek adsorpsiyon kapasitesi, sıcaklık ve su içeriğindeki değişimlere karşı dayanıklılık, inşaat aşamasında ve sonrasında süreklilik sağlayacak uygun mekanik özelikler, ucuz maliyet ve bol miktarlarda bulunabilirliktir.…”

Adsorption of Heavy Metals on Bentonitic Soil for Use in Landfill Liners

“…Inadequate disposal of residues from industrial sectors has caused considerable environmental impacts. These residues contain pollutants that can be organic and inorganic [1,2], heavy metals being the major components of inorganic pollutants. Heavy metal sources can have natural origin, such as rock weathering and volcanic eruptions, and anthropogenic origin, including mining, agriculture, and industry [3][4][5].…”