Enhancing Biological Treatability of Landfill Leachate by Chemical Oxidation

1997 ◽  
Vol 14 (1) ◽  
pp. 73-79 ◽  
Author(s):  
YEONG-KWAN KIM ◽  
IN-RYANG HUH
Keyword(s):  
Landfill Leachate ◽  
Chemical Oxidation ◽  
Biological Treatability

TREATABILITY OF 2,4-D PRODUCTION WASTEWATERS

1994 ◽  
Vol 30 (3) ◽  
pp. 73-78 ◽  
Author(s):  
O. Tünay ◽  
S. Erden ◽  
D. Orhon ◽  
I. Kabdasli
Keyword(s):  
Hydrogen Peroxide ◽  
Activated Sludge ◽  
Partial Oxidation ◽  
Chloride Concentration ◽  
Chemical Oxidation ◽  
Cod Removal ◽  
Optimum Conditions ◽  
Organic Loading ◽  
Activated Sludge System ◽  
Biological Treatability

This study evaluates the characterization and treatability of 2,4-D production wastewaters. Wastewaters contain 20000-40000 mg/l COD, 17000-30000 mg/l chloride and pH is around 1.0. Chemical oxidation with hydrogen peroxide provided almost complete COD removal. The optimum conditions are 3:1 H2O2/COD oxidant dosage, 3000 mg/l Fe3+ as catalyst and pH 3. Partial oxidation at 0.5:1 H2O2//COD ratio is also effective providing 67% COD removal. A batch activated sludge system is used for biological treatability. Dilution is needed to maintain a tolerable chloride concentration which increases through COD removal. pH also increased during COD removal. 85% COD removal is obtained for the 50% dilution at an organic loading of 0.3 day‒1 on a COD basis. Completely and partially oxidized wastewaters are also treated in the activated sludge down to 30 mg/l BOD5.

Performance of an anaerobic baffled reactor (ABR) as a hydrolysis-acidogenesis unit in treating landfill leachate mixed with municipal sewage

2000 ◽  
Vol 42 (12) ◽  
pp. 115-121 ◽  
Author(s):  
B. Wang ◽  
Y. Shen
Keyword(s):  
Landfill Leachate ◽  
Loading Rate ◽  
Granular Sludge ◽  
Operational Performance ◽  
Municipal Sewage ◽  
Organic Loading Rate ◽  
Stable Operation ◽  
Organic Loading ◽  
Anaerobic Baffled Reactor ◽  
Biological Treatability

A study on the performance of an Anaerobic Baffled Reactor(ABR) as a hydrolysis-acidogenesis unit in treating the mixed wastewater of landfill leachate and municipal sewage in different volumetric ratios was carried out. The results showed that ABR substantially improved the biological treatability of the mixed wastewater by increasing its BOD5/COD ratio to 0.4–0.6 from the initial values of 0.15–0.3. The formation of bar-shaped granular sludge of 0.5–5 mm both in diameter and length with an SVI of 7.5–14.2 ml/g was observed in all compartments of the ABR when the organic loading rate reached 4.71 kgCOD/m3 · d. The effects of the ratios of NH4+-N/COD and COD/TP in mixed wastewater on the operational performance were also studied, from which it was found that a reasonable NH4+-N/COD ratio should be lower than 0.02, and the phosphorus supplement was needed when the volumetric ratio was higher than 4:6 for stable operation of ABR.

Introduction to Leachate Treatment

2015 ◽  
pp. 200-218
Author(s):  
Amin Mojiri ◽  
Siti Fatihah Binti Ramli ◽  
Wan Izatul Saadiah Binti Wan Kamar
Keyword(s):  
Landfill Leachate ◽  
Membrane Filtration ◽  
Chemical Precipitation ◽  
Electrochemical Treatment ◽  
Chemical Oxidation ◽  
Treatment Technique ◽  
Leachate Treatment ◽  
Exchange Adsorption ◽  
Suitable Treatment ◽  
Physical And Chemical

Leachate is created while water penetrates through the waste in a landfill, carrying some forms of pollutants. The goal of this chapter is the introduction to leachate treatment. Biological, physical, and chemical treatments of leachate are the most common methods. The biological techniques in leachate treatment are studied. The physical-chemical ways for landfill leachate treatment like chemical precipitation, chemical oxidation, coagulation–flocculation, membrane filtration, ion exchange, adsorption and electrochemical treatment are studied. The landfill leachate properties, technical applicability and constraints, effluent discharge alternatives, cost-effectiveness, regulatory requirements and environmental impact are important factors for selection of the most suitable treatment technique for landfill leachate treatment.

Ammonia Removal from a Landfill Leachate by Nitrification and Denitrification

1985 ◽  
Vol 20 (3) ◽  
pp. 126-137 ◽  
Author(s):  
S. Dedhar ◽  
D.S. Mavinic
Keyword(s):  
Toxic Effect ◽  
Landfill Leachate ◽  
Ammonia Removal ◽  
Cod Removal ◽  
Glucose Loading ◽  
System A ◽  
Bacterial Uptake ◽  
Nitrification And Denitrification ◽  
Biological Treatability ◽  
Removal System

Abstract The purpose of this research project was to study the biological treatability of a leachate from an “older” landfill, with specific regard to the removal of ammonia by nitrification and denitrification. A single sludge denitrification system with recycle was used. Leachate ammonia concentrations of up to 288 mg/L-N were reduced to less than 1 mg/L. The ammonia was removed by nitrification and bacterial uptake. Glucose was added to aid denitrification. The degree of denitrification was dependent on the glucose loading to the anoxic reactor. The influent leachate COD removal was 20%; however after the addition of glucose to the system, a mean COD removal of 74% was obtained. The four metals monitored, zinc, manganese, nickel and iron were removed by the biomass, but not to the same extent. At the metal concentrations observed, there was no inhibitory/toxic effect to the ammonia removal system employed.

Introduction to Leachate Treatment

2020 ◽  
pp. 157-176
Author(s):  
Amin Mojiri ◽  
Siti Fatihah Binti Ramli ◽  
Wan Izatul Saadiah Binti Wan Kamar
Keyword(s):  
Landfill Leachate ◽  
Membrane Filtration ◽  
Chemical Precipitation ◽  
Electrochemical Treatment ◽  
Chemical Oxidation ◽  
Treatment Technique ◽  
Leachate Treatment ◽  
Exchange Adsorption ◽  
Suitable Treatment ◽  
Physical And Chemical

Leachate is created while water penetrates through the waste in a landfill, carrying some forms of pollutants. The goal of this chapter is the introduction to leachate treatment. Biological, physical, and chemical treatments of leachate are the most common methods. The biological techniques in leachate treatment are studied. The physical-chemical ways for landfill leachate treatment like chemical precipitation, chemical oxidation, coagulation–flocculation, membrane filtration, ion exchange, adsorption and electrochemical treatment are studied. The landfill leachate properties, technical applicability and constraints, effluent discharge alternatives, cost-effectiveness, regulatory requirements and environmental impact are important factors for selection of the most suitable treatment technique for landfill leachate treatment.

scholarly journals Anaerobic treatment of Hong Kong leachate followed by chemical oxidation

2005 ◽  
Vol 52 (10-11) ◽  
pp. 41-49 ◽  
Author(s):  
H.H.P. Fang ◽  
I.W.C. Lau ◽  
P. Wang
Keyword(s):  
Hong Kong ◽  
Landfill Leachate ◽  
Growth Yield ◽  
Anaerobic Treatment ◽  
Chemical Oxidation ◽  
Upflow Anaerobic Sludge Blanket ◽  
Uasb Reactor ◽  
Anaerobic Sludge ◽  
Final Effluent ◽  
Ozonation Process

Landfill leachate of Hong Kong was first treated by the upflow anaerobic sludge blanket (UASB) process. At 37°C, pH 7.1–8.5 and a HRT of 5.1–6.6 days, the process removed 66–90% of COD in the leachate for loading rates of 1–2.4g-COD/lday depending on the strength of landfill leachate. The final effluent contained 1440–1910mg-COD/l and 70–91mg-BOD/l. About 92.5% of the total COD removed was converted to methane and the rest was converted to biomass with an average net growth yield of 0.053g-VSS/g-COD-removed. The granules developed in the UASB reactor were 0.5–1.5mm in size and exhibited good settleability. The UASB effluent was then further polished by two oxidation processes. The UASB-ozonation process removed 93.0% of the 12900mg/l of COD from the raw leachate. The UASB-Fenton-ozonation process improved the COD removal efficiency to 99.3%. The final effluent had only 85mg/l of COD and 10mg/l of BOD5. Ozonation was most effectively conducted at pH 7–8 with the addition of 300mg/l of H2O2 and for the duration of 30min. Ozonation also significantly improved the biodegradability of the organic residues. Nearly 50% of these residues could be used as carbon source in denitrification.

Chemical oxidation for the treatment of leachate-process comparison and results from full-scale plants

1997 ◽  
Vol 35 (4) ◽  
pp. 249-256 ◽  
Author(s):  
Martin Steensen
Keyword(s):  
Hydrogen Peroxide ◽  
Energy Consumption ◽  
Landfill Leachate ◽  
Biological Treatment ◽  
Fixed Bed ◽  
Chemical Oxidation ◽  
Full Scale ◽  
Organic Substances ◽  
Process Comparison ◽  
Uv Ozone

Before landfill leachate is discharged, extensive removal of organic substances is required which cannot be achieved by biological treatment only. Chemical oxidation has the advantage of the substances being almost completely converted. Hydrogen peroxide/UV, ozone and ozone/fixed bed catalyst processes were used for the purification of three biologically pre-treated leachates. With all processes sufficient purification levels were achieved. However, the required energy consumption is largest with the hydrogen peroxide/UV process. If chemical oxidation is combined with biological purification, the discharge quality can be increased at decreased oxidant consumption.

Treatability of strong wastewaters from polyester manufacturing industry

1999 ◽  
Vol 39 (10-11) ◽  
pp. 1-7 ◽  
Author(s):  
S. Meriç ◽  
I. Kabdaşli ◽  
O. Tünay ◽  
D. Orhon
Keyword(s):  
Biological Treatment ◽  
Manufacturing Industry ◽  
Chemical Oxidation ◽  
Cod Removal ◽  
Small Scale ◽  
Cost Of Treatment ◽  
Esterification Reactions ◽  
Biological Treatability ◽  
Methods Of Treatment ◽  
Raw Wastewater

In this paper, the treatability of strong wastes originating from an organic chemicals industry was studied. Literature data were evaluated to assess the applicability of conventional and advanced methods of treatment to highly concentrated wastewaters. A detailed treatability study was conducted on the wastewater, which was provided from a small-scale polyester manufacturing plant. The manufacturing process involved only esterification reactions, generating a wastewater with a COD content of over 200,000 mgl−1. The applicable treatment methods to be tested were determined as biological treatment of activated sludge process with low organic loading and chemical oxidation with H2O2. Results of the biological treatability study indicated that 80% COD removal could be obtained with 10 days retention time, provided that the system was fed with a 1/100 diluted raw wastewater. Chemical oxidation of raw wastewater with H2O2 in acid conditions and using ferric chloride as catalyst yielded 70% COD removal. However, the dosage required to obtain this efficiency was about 1 kg H2O2 per m3 of wastewater. With these applications the wastewater was treated to yield a COD of lower than 2000 mg/l. Results of the study were discussed and evaluated considering complexity and cost of treatment.

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