Removal of COD and Colour from Sanitary Landfill Leachate by using Coagulation – Fenton’s Process (original) (raw)
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Cod Removal from Landfill Leachate Using Fenton Oxidation and Coagulation
Architecture Civil Engineering Environment, 2010
A b s t r a c t The treatment of old municipal landfill leachate by Fenton oxidation, coagulation as well as coagulation combined with the Fenton oxidation was carried out on a laboratory scale. It has been found that organic pollutants in leachate could be suc cessfully removed by Fenton oxidation. The most advantageous dose of H 2O2 and Fe 2+ /H 2O2 ratio were 1350 mg/L and 0.2, respectively at pH 3 and reaction time of 45 minutes. In these operating conditions, the COD removal efficiency reached 61%. However, a 73.1% removal of COD was attained after 26 hours of Fenton oxidation. In coagulation process, the effi ciency was within the range of 39-45.8% using PIX as a coagulant at dose of 500 mg/L (pH 5 and 30 min of reaction time). The best result of COD removal (65.3%) was obtained in the combined treatment system including a coagulation process, followed by a Fenton oxidation. In this case, COD removal by coagulation was 45.8% while by Fenton oxidation only 19.5%. Therefore more...
Treatment of landfill leachate using Fenton process and coagulation/flocculation
Water and Environment Journal, 2013
Coagulation/flocculation process, Fenton oxidation and combinations between them were studied, aiming to provide an efficient method for the treatment of partially stabilized leachates. Leachates were collected from a municipal landfill site, samples containing around 3800 mg/L COD, BOD5/COD ratio about 0.11 and pH around 8. The sequence of stages implemented was: (a) coagulation/flocculation; (b) Fenton oxidation; (c) coagulation/flocculation followed by Fenton oxidation which resulted in a best COD removal (63.62%) and (d) Fenton oxidation followed by coagulation/flocculation.
Determination of Cod and Color Reduction of Stabilized Landfill Leachate by Fenton Process
Journal of Asian Scientific Research, 2017
The Fenton process on landfill leachate was done in a batch reactor. The application of Fenton treatment technology for landfill leachate treatment greatly depends on the optimum Fenton operating conditions. The present study investigated the chemical oxygen demand (COD) and color removal efficiency of a non-biodegradable leachate by Fenton process. Determining optimum Fenton conditions requires multiple experiments using variable reaction parameters (pH, temperature, and H2O2 and Fe 2+ doses).The treatment showed that the leachate organics can be broke down by the use of Fenton's reagent. The result showed that with increasing H2O2 dosage, H2O2/Fe 2+ ratio and decreasing the pH and contact time, the COD and color removal increased. The laboratory result determined that the best functional situation to catch the goals _ (i.e., BOD5/COD =0.1) resulted; pH=3, Contact time=30 minutes, H2O2 concentration= 40000 mgL-1 and the favorable H2O2/Fe 2+ ratio = 10. Contribution/ Originality: The main contribution of this research is a better understanding of the treatment of landfill leachate using Fenton process for COD and Color removal to meet effluent discharge standards. 1. INTRODUCTION The landfill leachate made from solid waste in cities and landfill sites are known as wastewaters which are dangerous and extremely polluted. There exist a large amount of organic materials as both kinds of biodegradable and bio refractory carbon, ammonia-nitrogen, heavy metals, and chlorinated organic and inorganic salts in leachates [1]. Environmental problems can be resulted from discharging the landfill leachate in the way of percolating through soils and sub-soils with an inappropriate and bad dispose of the landfill leachate such problems causes' serious ground and surface water pollution [2, 3]. AOP are generally explain as the processes of oxidation producing hydroxyl radicals in an acceptable amount to have an effect on water and wastewater treatment [4]. The hydroxyl radical is defined as one of the most reactive free radicals and one of the strongest oxidants (HO°+H + +e-→H2O; E 0 = 2.33 mV). Except the Fenton process, a large number of systems can be classified as AOP, and most of such systems use a combination [5]. Fenton process (FP) removes a wide range of OM and has been studied by several researchers for treatment of
Optimization for Fenton Process in Removal of COD for Landfill Leachate Treatment
International Journal of Environmental Science and Development, 2015
Present study has the aimed to assess the percentage of removal of chemical oxygen demand (COD) of non-biodegradable leachate from the landfill in the city of Loja (Ecuador) to be subjected to a Fenton process. Different concentrations of H 2 O 2 and FeSO 4 were combined in acidic pH values, obtaining removals close to 80% with a concentration of 500 ppm of H 2 O 2 and 1000 ppm of FeSO 4 at pH 4, thus establishing an optimum working radius H 2 O 2 /FeSO 4 equal to 0.5. Through Box-Behnken statistical analyses were determinates the significant factors, which correspond to the concentration of H 2 O 2 and FeSO 4 employed. With this information the process was optimized, reaching a theoretical removal of 81% at concentrations of 312 ppm of H 2 O 2 and 1087 ppm of FeSO 4 at pH 4. It was observed in this process removal of 79% of turbidity, 33% of Nitrates and 89% of Phosphates.
Colour removal from landfill leachate by coagulation and flocculation processes
Bioresource Technology, 2007
A study was conducted to investigate the efficiency of coagulation and flocculation processes for removing colour from a semi-aerobic landfill leachate from one of the landfill sites in Malaysia. Four types of coagulant namely aluminium (III) sulphate (alum), ferric (III) chloride, ferrous (II) sulphate and ferric (III) sulphate were studied using standard jar test apparatus. Results indicated that ferric chloride was superior to the other coagulants and removed 94% of colour at an optimum dose of 800 mg/l at pH 4. The effect of coagulant dosages on colour removal showed similar trend as for COD, turbidity and suspended solids. This suggested that colour in landfill leachate was mainly contributed by organic matters with some insoluble forms that exhibited turbidity and suspended solids readings. The results from this study suggested that ferric chloride could be a viable coagulant in managing colour problems associated with landfill leachate.
Environment Protection Engineering
Landfill leachates (LFL) collected from Sfax (Tunisia) discharge area are characterized by high chemical oxygen demand (COD), ammonium and salts contents. They constitute a source of phytotoxicity and pollution for ground water and surface water resources which requires an adequate treatment process. To evaluate the efficiency of the coagulation/flocculation treatment, special attention was paid to the effect of pH, coagulant and flocculant doses. Then, effect of zero valent iron was also studied alone and in combination with coagulation/flocculation pretreatment. Our results indicate high removal efficiencies by coagulation/flocculation (46% COD and 63% turbidity) and Fenton process (48% COD and 76% turbidity). The combined application of coagulation/flocculation and Fenton revealed higher COD removal (62%) and turbidity reduction (90%). These results showed the applicability of this combined treatment method for the degradation of organic compounds and reduction of the treated leachate toxicity.
Optimization of COD and Colour Removal From Landfill Leachate by Electro-Fenton Method
2013
The contamination of untreated leachate effluent is a potential source to effect of soil, surface and groundwater.In this study, the treatment of landfill leachate by electro-Fenton (EF) method was studied. The objectives of the study are to determine the optimum current density, the optimum treatment time, the optimum pH, the optimum hydrogen peroxide (H2O2) dosage and the optimum ferrous sulphate heptahydrate (FeSO4 •7H2O) dosage of landfill leachate samples using aluminium electrode. From the results, it is verified that electro-Fenton method (EF) can used efficiently to degrade leachate organics. The best removal efficiencies were obtained when current density value is 200 A/m 2 , treatment time is 25 min and pH value is 4. The optimum dose of hydrogen peroxide (H2O2) is 800 mg/L which was obtained 78% and 96% of COD and colour removal efficiency respectively. The optimum ferrous ion (Fe 2+ ) is 1000 mg/L which was obtained 75% and 94% of COD and colour
Optimization of COD, apparent color, and turbidity reductions of landfill leachate by Fenton reagent
2013
The efficiency of Fenton reagent (Fe 2+ + H 2 O 2 +H + ) for the leachate generated from Pulau Burung sanitary landfill site, located in Malaysia, was evaluated with the objectives of chemical oxygen demand (COD), apparent color, and turbidity reductions. Response surface methodology was used to study the effect of hydrogen peroxide (as oxidant) and ferrous sulfate (as catalyst) on COD, apparent colour, and turbidity reductions of sanitary landfill leachate. A central composite design in two factors [hydrogen peroxide dosage (mg/L) and ferrous sulfate dosage (g/L)] was employed to build a model as well as to perform optimization of the Fenton process. The optimum results for COD, apparent color, and turbidity reductions were 68, 81, and 86%, respectively, setting [H 2 O 2 ] at 747.8 mg/L and [FeSO 4 ] at 12.8 g/L.
Preliminary Tests of Cod Removal from Landfill Leachate Using Coagulation-Flocculation Processes
Architecture Civil Engineering Environment, 2009
A b s t r a c t The preliminary tests of effective COD removal by coagulation-flocculation processes from landfill leachate were carried out. The municipal landfill, from which leachate was collected has been exploited since 2004. The leachate characterized with comparatively low contents of organic matters expressed as COD (2000-2600 mg O 2/L), and pH value within the range of 7.4-7.6. The coagulation process was conducted using 3 coagulants: PIX 110-10, Al 2(SO 4)3 and FeCl 3. The applied coag ulant doses were within the range of 100-2500 mg/L. In the first part of research the most profitable parameters of coagu lation were chosen. It was noted that the ferric coagulants were determined to have bigger treatment efficiency than alu minium sulphate. The highest effectiveness of COD removal (56%) was obtained when FeCl 3 was used in dose of 2100 mg/L. The worse efficiency (only about 44%) was observed when Al 2(SO 4)3 was used in coagulation process in dose of 1550 mg/L. In the seco...