An overview of electro-oxidation processes performance in stabilized landfill leachate treatment

The technology used the coagulation-sedimentation + electro-oxidation joint reactor has been studied to treat landfill leachate. First adding FeCl30.4g/L into all leachate for coagulation and sedimentation, its CODcr elimination rate can achieve 35%, but does have no effect on ammonia nitrogen. Then using electro-oxidation reactor to deal with effluent water, the reaction order of electro-oxidation reactor is first-level, as the reaction conditions are 20mA/cm2 of electric current density, 140min of reaction time, the leachate CODcr elimination rate can reach to above 90%, the ammonia nitrogen elimination rate meets to 98% around. Using coagulation-sedimentation + electro coagulation joint reactor to treat landfill leachate can get stable effluent water quality with good treatment effect, has very high elimination efficiency of CODcr and ammonia nitrogen. It is a suitable treatment technology for landfill leachate.

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The removal of organic compounds from landfill leachate using ozone-based advanced oxidation processes

E3S Web of Conferences ◽

10.1051/e3sconf/20184500046 ◽

2018 ◽

Vol 45 ◽

pp. 00046

Author(s):

Jacek Leszczyński ◽

Jolanta Walery Maria

Keyword(s):

Hydrogen Peroxide ◽

Organic Compounds ◽

Removal Efficiency ◽

Landfill Leachate ◽

Advanced Oxidation Processes ◽

Advanced Oxidation ◽

Uv Absorbance ◽

Leachate Treatment ◽

Oxidation Processes ◽

Ozone Dose

In this study, the application of ozonation and ozonation with hydrogen peroxide processes for landfill leachate treatment was investigated. The effluents were characterized by COD 710 mgO2/dm3 and BOD5 72 mg O2/dm3. According to the adopted indicators, the determined BOD/COD ratio of 0.1 in raw leachates indicates a stabilized landfill. Ozone was applied at doses of 0.15 - 0.6 gO3/dm3, and hydrogen peroxide at such doses to keep the weight ratios of H2O2/O3 0.4 - 1.6. The maximum COD and UV absorbance removal was respectively 29% and 51% by applying a high ozone dose of 0.6 gO3/dm3. After oxidation, the ratio of BOD/COD was increased from 0.1 up to 0.3. It has been shown that by using hydrogen peroxide in ozonation, organic compounds expressed as COD can be efficiently removed from the effluents. The best conditions for the H2O2/O3 process were obtained with a H2O2/O3 ratio of 0.8 and ozone dose of 0.6 gO3/dm3. Under these conditions, the removal efficiency of COD was 46%.

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Advanced Oxidation Processes (AOPs) in Landfill Leachate Treatment

Advances in Environmental Engineering and Green Technologies - Advanced Oxidation Processes (AOPs) in Water and Wastewater Treatment ◽

10.4018/978-1-5225-5766-1.ch013 ◽

2019 ◽

pp. 355-383

Author(s):

Mohamad Anuar Kamaruddin

Keyword(s):

Landfill Leachate ◽

Advanced Oxidation Processes ◽

Advanced Oxidation ◽

Sanitary Landfill ◽

Biological Degradation ◽

High Concentration ◽

Leachate Treatment ◽

Oxidation Processes ◽

Acceptable Method ◽

High Concentrations

Sanitary landfilling is the most acceptable method to eliminate solid urban wastes. However, it is known that sanitary landfill generates large amount of heavily polluted leachate. High concentrations of recalcitrant organics make its degradation more complicated and high concentration of organic material can be toxic and reduce bioremediation process. Landfill leachate treatment by advanced oxidation processes (AOPs) have been intensively studied with high successful rate for removing refractory pollutants (biological degradation) from leachate. Fenton reaction which is one basic AOPs is based on the addition of hydrogen peroxide to the leachate in the presence of ferrous salt as a catalyst. Because of that, many improvement and development of new Fenton-based methods have been reported in the literature. This review discussed the application of Fenton and related processes in terms of wide application in landfill leachate treatment. The effects of various operating parameters and their optimum ranges for organics contaminant removed were also discussed.

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