Leachate characterization in semi-aerobic and anaerobic sanitary landfills: a comparative study.

Landfill leachate treatment in Brazil - An overview.

Fluorescence excitation-emission matrix spectroscopy with regional integration analysis for characterizing composition and transformation of dissolved organic matter in landfill leachates.

Landfills are the primary option for waste disposal all over the world. Most of the landfill sites across the world are old and are not engineered to prevent contamination of the underlying soil and groundwater by the toxic leachate. The pollutants from landfill leachate have accumulative and detrimental effect on the ecology and food chains leading to carcinogenic effects, acute toxicity, and genotoxicity among human beings. Management of this highly toxic leachate presents a challenging problem to the regulatory authorities who have set specific regulations regarding maximum limits of contaminants in treated leachate prior to disposal into the environment to ensure minimal environmental impact. There are different stages of leachate management such as monitoring of its formation and flow into the environment, identification of hazards associated with it, and its treatment prior to disposal into the environment. This article focuses on: (i) leachate composition, (ii) plume migration, (iii) contaminant fa...

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Contemporary Environmental Issues of Landfill Leachate: Assessment and Remedies

Estimation of the environmental risk posed by landfills using chemical, microbiological and ecotoxicological testing of leachates.

Natural attenuation and characterization of contaminants composition in landfill leachate under different disposing ages

Martial recycling from renewable landfill and associated risks: A review

Application of hydration reaction on the removal of recalcitrant contaminants in leachate after biological treatment.

Source reduction of the landfill leachate strength in a functional layer embedded landfill (FLEL)

Biohydrometallurgy is a novel method to recycle discarded batteries, in which sewage sludge is used as microorganisms and culture due to the presence of indigenous Thiobacilli. A two-step continuous flow leaching system consisting of an acidifying reactor and a leaching reactor was introduced to achieve the bioleaching of spent nickel-cadmium (Ni-Cd) batteries. The acid supernatant produced in the acidifying reactor by the microorganisms with ferrous ions as the substrate was conducted into the leaching reactor to dissolve electrode materials. The efficiency of a batch treatment of batteries was examined. The results showed that the complete dissolution of two AA-sized Ni-Cd batteries with 0.6 L/d acid supernatant took about 30, 20, and 35 days for Ni, Cd, and Co, respectively. But the dissolution ability of the three metals was different. Cd and Co can be leached mostly for pH below 4.0 while the complete dissolution of Ni can be achieved for pH below 2.5. Meanwhile, a strain (named Thiooxidans. WL) accounting for the reduction of pH in the acidified sludge was isolated and sequenced. It was identified to be 100% similar to Acidithiobacillus ferrooxidans strain Tf-49 based on 16S rDNA sequence analysis. The relevant phylogenetic tree constructed indicates that the strain should be classified into genus Acidithiobacillus ferrooxidans.

Zhu Nanwen

Papers

Natural attenuation and characterization of contaminants composition in landfill leachate under different disposing ages

Martial recycling from renewable landfill and associated risks: A review

Application of hydration reaction on the removal of recalcitrant contaminants in leachate after biological treatment.

Source reduction of the landfill leachate strength in a functional layer embedded landfill (FLEL)

Bioleaching of spent Ni-Cd batteries and phylogenetic analysis of an acidophilic strain in acidified sludge