Treatment of Landfill Leachate using Coagulation (original) (raw)
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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...
Treatment of Landfill Leachate through Coagulation Process
Landfill leachate can be defined as a liquid that passes through the municipal solid waste (MSW) landfill and has extracted dissolved and suspended matter from it. The generation of leachate is a major problem for MSW landfills and causes significant threat to surface water and groundwater. Special care is required for efficient treatment and disposal. In addition, landfill leachate is complex waste water with considerable variation in both quality and quantity. The composition and concentration of pollutants are influenced by the types of waste deposited, hydro geological factors and more significant by the age of the landfill site. In general, leachate is highly contaminated with organic contaminants measured as chemical oxygen demand (COD), biochemical oxygen demand (BOD) and also with high ammonium nitrogen concentration. The main focused of this research is to investigate the performance of chemical treatment by coagulation process and to compare the efficiency of coagulants on removal of COD and TSS with standard tools in leachate samples which was collected from Rajbondh landfill in Khulna. The collected leachate samples were tested in the laboratory through the standard methods to measure the relevant parameters. The characteristics of leachate were: pH=8.6; BOD5=142.1 mg/L; COD=5760 mg/L; Temperature=28.7ºC; Electric Conductivity=5.67µs/cm; TS=17000 mg/L; TDS=16600 mg/L; TSS=400 mg/L; Turbidity=336 NTU; Color=17800 pt-co; Alkalinity=1700 mg/L; Salinity=2800 mg/L; T.C.=740; F.C.=300. The coagulation of leachate was accomplished by a technique consisted of Poly-Aluminum Chloride (PAC), Aluminum Sulphate (Al 2 (SO 4) 3 .18H 2 O) as Alum and Ferrous Sulphate (FeSO 4) in various dosages and different pH values (2, 5, 7 and 9). Results showed that the efficiency for COD removal by PAC at pH=9 and 2500 mg/L of coagulant dose, by Alum at pH=9 and 2500 mg/L of coagulant dose, by Ferrous Sulphate at pH=7 and 2000 mg/L of coagulant dose. The COD removal efficiency for PAC, Alum and Ferrous Sulphate were 81.82, 75 and 85.71% respectively. Results also showed that efficiency for TSS removal by PAC that was obtained at pH=5 and 2500 mg/L concentration of coagulant dose, by alum at pH=7 and 2500 mg/L concentration of coagulant dose and by ferrous sulphate at pH=9 and 2000 mg/L of coagulant dose. The TSS removal efficiency for PAC, Alum and ferrous sulphate are 46.15, 60 and 72.73% respectively. In this study carried out the COD and TSS removal efficiency both were better for ferrous sulphate. To depict the performance of used chemical coagulations then compared to the standards leachate discharge which are available in the literature.
Landfill Leachate Treatment by Coagulation and Flocculation Process
The leachate is a highly contaminant water hence it needs to be treated. The main aims of this research were to determine the Chemical oxygen demand (COD) concentration and heavy metals (zinc, chromium, lead, cadmium and nickel) in leachate in landfill area. The pollutants were analyzed using coagulation and flocculation process. The coagulants used were the aluminum sulphate (alum) and ferric chloride. The jar test apparatus were employed for the removal of pollutants. The experiments were carried out by varying the dosage of coagulants. The optimum pH level and the dosage level are also found as 8.5 and 3 g/l for ferric chloride and for alum 10.5 and 1.5 g/l. The alum is found to be efficient in the removal of heavy metals and ferric chloride for COD.
Removal of COD and Colour from Sanitary Landfill Leachate by using Coagulation – Fenton’s Process
Journal of Applied Sciences and Environmental Management, 2009
This study investigated two methods for the removal of COD and colour from sanitary landfill leachates. The first method involved the use of coagulation/flocculation process using FeCl 3 as a conventional coagulant and Ca(OH) 2 as base-precipitant. The second method involved integration of Fenton's reagent into the coagulation/flocculation process. Concentration of FeCl 3 that reduced chemical oxygen demand (COD), and color by 37 and 62% is 1000mg/l. Fenton-coagulation flocculation process reduced the COD and color of the leachates by 88 and 98% respectively. The optimum conditions for the effectiveness of Fenton's reagent, namely temperature, pH, H 2 O 2 and coagulant dose were studied. @JASEM JASEM
Abstract— In this work we examined the application of coagulation–flocculation for the treatment of stabilized leachates. Jar-test experiments were employed in order to determine the optimum concentration conditions for the removal of organic matter. Coagulant–flocculant combination, effective dosage Ferric chloride, Aluminum sulphate and Alginate were tested as conventional coagulants, whereas five commercial polyelectrolyte were co-examined: tree anionic and two cationic. The results indicate a coagulant FeCl3 remove of 67, 3% and 87% of COD and turbidity respectively from the stabilized landfill leach ate For optimal concentration of 3000 mg / l and a variable concentration of flocculant Astral, removal efficiencies of COD and turbidity varies respectively by 64% and 100%. We obtained for variable concentrations of FeCl3 and an optimal concentration of 198 mg/l of flocculant Astral yields disposal respectively 70.5 and 84% for COD and turbidity. These results are comparable to th...
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...
Background: Modifying and enhancing treatment methods is essential to meet effluent standards for treating landfill leachate. This study investigated the treatment of municipal solid waste leachate (MSWL) using coagulation, flocculation, advanced oxidation, and extended aeration processes. Methods: The effects of different coagulant doses and pH values on coagulation processes were compared. The treatment procedure was analyzed to determine the impact of varying concentrations of potassium persulfate (K 2 S 2 O 8) and hydrogen peroxide (H 2 O 2) on the results after coagulation with FeCl 3. The extended aeration process's biological stages were studied using a sludge retention time (SRT) of 23 days and the effects of hydraulic retention time (HRT) of 18 and 36 hours. Results: The experimental results show that in the pH range of 5-8, the lower the pH value, the higher the treatment efficiency. The addition of 0.8 g L 1− FeCl 3 can achieve a 57% removal of chemical oxygen demand (COD). The addition of 2.5 g L 1− K 2 S 2 O 8 and 1.5 g L 1− H 2 O 2 with UV-C (15 W) for 70 minutes at pH 7 can effectively remove 86% of COD. Activated sludge extended aeration can attain an 88% removal of COD under optimal operating conditions (HRT = 36 hours, SRT = 23 days, and aeration = 36 hours). The studied hybrid process with the efficiency of 99%, 98%, 95%, 87%, and 83% removal of COD, biochemical oxygen demand (BOD), total suspended solids (TSS), turbidity, and total Kjeldahl nitrogen (TKN), respectively, is suitable for leachate treatment. Conclusion: This study showed that flocculation-coagulation followed by the advanced oxidation process (AOP) and extended aeration can be an efficient and promising treatment method for MSWL.
Dosage and pH optimization on stabilized landfill leachate via coagulation-flocculation process
MATEC Web of Conferences, 2018
Treatment on the generated landfill leachate is crucial as it can cause serious toxicological effects and environmental hazards, particularly when the unfavorable contaminants are left accumulated for a long period of time. The purpose of this study was to determine the optimum coagulant dosage of polyaluminium chloride (PAC) in selected dosage ranges (2250-4500 mg/L) and to analyse the ideal pH of leachate sample (pH 3-10). PAC was tested on stabilized leachate taken from Simpang Renggam Landfill Site (SRLS), by investigating the percentage removals of five significant parameters, which were suspended solids, chemical oxygen demand (COD), ammonia, and heavy metals (iron (Fe) and chromium (Cr)). The removal efficiency was determined by a series of experiments using jar test. From the obtained results, it was found that 3750 mg/L and pH 7 were the optimum conditions for PAC dosage and sample pH, respectively. The conventional optimization test showed satisfactory results for suspende...