Characterizing landfill leachate migration potential of a semi-arid duplex soil

Abstract

Leachate migration from open landfills is an environmental concern of developing cities. This study investigated the base soil-profile pedo-physical and chemical properties of the South African Sepane soil form or referred to as Cutanic Luvisol at the Bloemfontein southern landfill under the Mangaung municipality in the Free State Province. Six soil-profiles pedo-physical, exchangeable-cations and heavy metals concentrations were characterized from in-situ, core and loose soil-samples. The DTPA Test from a 5g air-dried soil extracted heavy metals. The soil profile was characterized by a layered Orthic-A, pedocutanic B- and C-horizons with lower horizons containing mean-total clay of 72%, bulk-density (≥1.5 gcm−3) and saturated hydraulic-conductivity (Ks < 6mmhr-1). Mean soil pH increased with depth from 6.4 to 6.8 along-side exchangeable-cations ranging from 19 to 2573 mgkg-1 in the order Ca > Mg > K > Na > S > P and Ca > Mg > Na > K > S > P for the respective A- and B-horizons. The Mg/K and (Ca + Mg)/K exceeded norm ratios. Soil-profile horizons had respective 44%, 34% and 22% heavy-metal distribution with mean content range of 0.001–37.3 mgkg-1 in the order Mn > Fe > Cr > Zn > Cu > As > Pb > Ni > Cd and Fe > Mn > Cr > Cu > As > Pb > Zn > Ni > Cd for the surface and subsurface horizons, respectively. Heavy-metal mean concentrations were below the norm except for Cr that was higher than 150% from upper horizons and posed serious risk to the near-surface environment. Soil profiles heavy-metal content and pollution-index was unpolluted (0.3–0.4), decreased with depth and reflected no subsurface pollution concerns. This study findings highlighted low internal-migration potential of clay soils and the need for understanding the sources and mode of migration of Cr at the landfill alongside continued monitoring.

Assessment of heavy metals in RDF for thermochemical conversion

“…The order of 10 % of all solid wastes generated in South Africa was recycled in 2011. Landfilling of MSW releases GHGs and volatile organic compounds along with leachable toxic heavy metals to the surrounding environment [15][16][17]. The enormous emission of GHGs from some existing and closed landfilling site in South Africa is calling for thorough and serious solution [18,19].…”

Levantamento De Emissões Atmosféricas Veiculares Na Utfpr Londrina

“…KEYWORDS: Movement, Soil Columns, Miscible Displacement, Transport Parameters, Landfill Leachate, Cadmium. (Aish et al, 2014;Pazoki et al, 2017;Mavimbela et al, 2019;Söderberg et al, 2019;Fandiño et al (2020). Esses autores detectaram que, dependendo do metal e da região estudada, esses metais podem atingir o aquífero entre 5 a 50 anos.…”

Fiscalização Ambiental Em Empresas Que Comercializam Agrotóxicos No Estado Do Ceará

“…Penso que essa experiência ilustra o que Gadotti reivindica, quando propõe que a educação precisa deixar de ser parte do problema do desenvolvimento para que se transforme numa aliada em busca da solução do desenvolvimento de sociedades sustentáveis. , 144, 147, 148, 150, 155, 156, 191, 193, 194, 195, 200, 202 Deslocamento miscível 49, 50, 54 Desmatamento 19,20,21,23,28,30,31,32,120,126,129,143,151,152,153 Doença ocupacional 134,135,136,137,138,139,140 E Ecossistemas 21,30,40,42,51,65,66,68,80,82,83,87,88,91,104,115,145,174,176,178,179,180,181,182,184,186,195,196,197,202 Educação ambiental 71,124,…”