Management and treatment of landfill leachate by a system of constructed wetlands and ponds in Singapore

2013 ◽  
Vol 68 (5) ◽  
pp. 1114-1122 ◽  
Author(s):  
C. H. Sim ◽  
B. S. Quek ◽  
R. B. E. Shutes ◽  
K. H. Goh
Keyword(s):  
Water Quality ◽  
Landfill Leachate ◽  
Oxygen Demand ◽  
Treatment System ◽  
Plant Management ◽  
Leachate Treatment ◽  
Reed Beds ◽  
Treated Effluent ◽  
Removal Efficiencies ◽  
Pre Treatment

Lorong Halus, Singapore's first landfill leachate treatment system, consists of a pre-treatment system (8,000 m2), five constructed reed beds (38,000 m2), five polishing ponds (13,000 m2), an education centre and a learning trail for visitors. Eight species of wetland plants (total 160,000 plants) were selected for their ability to uptake nutrients, tolerance to low phosphorus concentrations and resistance to pest infestations. The wetland was launched in March 2011 and water quality monitoring started in April 2011. The removal efficiencies of the pre-treatment system from April 2011 to August 2012 are biochemical oxygen demand (BOD5) 57.4%; chemical oxygen demand (COD) 23.6%; total suspended solids (TSS) 55.1%; ammoniacal nitrogen (NH4-N) 76.8%; total phosphorus (TP) 33.3% and total nitrogen (TN) 60.2%. Removal efficiencies of the reed beds are BOD5 47.0%; COD 42.2%; TSS 57.0%; NH4-N 82.5%; TP 29.3% and TN 83.9%. Plant growth is generally satisfactory, but the lower than designed volume of leachate has adversely affected some sections of plants and resulted in uneven flow distribution in reed beds. The plant management programme includes improving plant regrowth by harvesting of alternate strips of plants and replanting. The treated effluent meets water quality limits for discharge to the public sewer and is subsequently treated by the NEWater treatment system, which recycles water for industrial and indirect potable use.

scholarly journals The comparison of efficiency of Fenton and photo-Fenton treatment of stabilised landfill leachate / Porównanie efektywności oczyszczania odcieków z ustabilizowanego składowiska odpadów komunalnych w procesie Fentona i foto-Fentona

2015 ◽  
Vol 26 (3) ◽  
pp. 49-53 ◽  
Author(s):  
Anna Kwarciak-Kozłowska ◽  
Aleksandra Krzywicka
Keyword(s):  
Landfill Leachate ◽  
Fenton Reaction ◽  
Ferrous Sulphate ◽  
Oxygen Demand ◽  
Ammonia Nitrogen ◽  
Ammonia Removal ◽  
Mass Ratio ◽  
Leachate Treatment ◽  
Initial Ph ◽  
Removal Efficiencies

Abstract The goal of this article was to compare the efficiency of Fenton and photo-Fenton reaction used for stabilised landfill leachate treatment. The mass ratio of COD:H2O2 was fixed to 1:2 for every stages. The dose of reagents (ferrous sulphate/hydrogen peroxide) was different and ranged from 0.1 to 0.5. To determine the efficiency of treatment, the BOD (biochemical oxygen demand COD (chemical oxygen demand), TOC (total organic carbon) , ammonia nitrogen and BOD/COD ratio was measured. The experiment was carried out under the following conditions: temperature was 25ºC, the initial pH was adjusted to 3.0. Every processes were lasting 60 minutes. The most appropriate dose of reagents was 0.25 (Fe2+/H2O2). It was found that the application of UV contributed to increase of COD, TOC and ammonia removal efficiencies by an average of 14%.

Sustainable landfill leachate treatment

2020 ◽  
Vol 38 (10) ◽  
pp. 1093-1100
Author(s):  
Yudi Wu ◽  
Boya Wang ◽  
Gang Chen
Keyword(s):  
Landfill Leachate ◽  
Oxygen Demand ◽  
Ammonium Nitrogen ◽  
Treatment System ◽  
Solid Waste Disposal ◽  
Leachate Treatment ◽  
Leachate Collection ◽  
Wetland Treatment ◽  
In Series ◽  
Calcium Magnesium

Landfilling is one of the most widely used forms of solid waste disposal, yet the management of landfill leachate is challenging because of the complex composition and high contaminant concentration. This study provides an on-site treatment system to treat 500 m3 day-1 of the leachate generated from the Perdido Landfill in Escambia County, Florida. The main concerns of the landfill leachate are ammonium-nitrogen, total dissolved solids (TDS) and biological oxygen demand (BOD) from the long-term monitoring (from September 1999 to May 2015). To target these major contaminants as well as other pollutants, we designed a wetland treatment system by fully utilizing the existing facilities at the Perdido Landfill site. The modified wetland treatment system consists of five components in series: leachate collection/aeration ponds, anaerobic ponds, aerobic ponds, wetlands and limestone filter ponds. The leachate collection/aeration ponds provide functions of nitrification as well as ammonia and CO2 stripping. The following anaerobic ponds focus on nitrogen removal by denitrification. The BOD is removed in the aerobic ponds. The TDS are removed in the wetlands and limestone filter ponds. In the wetlands, 60% of chloride and 40% of other contaminants are absorbed by Parthenium sp. In the limestone filter ponds, bicarbonate, calcium, magnesium and iron are removed.

scholarly journals Treatability study of two hybrid-passive treatment systems for landfill leachate operated at cold temperature

2011 ◽  
Vol 46 (3) ◽  
pp. 230-238 ◽  
Author(s):  
Sean Speer ◽  
Pascale Champagne ◽  
Bruce Anderson
Keyword(s):  
Landfill Leachate ◽  
Oxygen Demand ◽  
Cold Climate ◽  
Cold Temperature ◽  
Passive Treatment ◽  
Treatment System ◽  
Trickling Filter ◽  
Leachate Treatment ◽  
Wood Shaving ◽  
Treatment Train

Cold ambient temperatures can negatively affect the performance of passive and semi-passive landfill leachate treatment systems and decrease treatment efficiency. Cold temperature leachate treatment efficiencies were compared between a commercially available semi-passive treatment system and a passive peat and wood shaving biological trickling filter. The addition of an active fixed-film pretreatment stage in the treatment train was also assessed. Results indicated that the internal temperature of the peat filters was independent of influent water temperature; exothermic reactions maintained internal system temperatures. It was determined that pretreatment of the leachate did not affect the overall removal of chemical oxygen demand (COD), but did increase nitrification in the subsequent passive treatment systems and allowed for the removal of dissolved inorganic constituents prior to the passive treatment system, which will extend the useful life of the entire treatment train. The hybrid-passive treatment systems reduced COD concentrations by 10 ± 3% and 15 ± 3%, in the semi-passive treatment system and the peat and wood shaving biological trickling filter-based systems, respectively, and indicated that nitrifying biomass was starting to populate the treatment systems. It was therefore concluded that operation of these systems would be feasible under cold climate and should be assessed at the pilot-scale.

scholarly journals Septage unit treatment by sludge treatment reed beds for easy management and reuse: performance and design considerations

2017 ◽  
Vol 77 (2) ◽  
pp. 279-285 ◽  
Author(s):  
Boram Kim ◽  
Thomas Bel ◽  
Pascal Bourdoncle ◽  
Jocelyne Dimare ◽  
Stéphane Troesch ◽  
...  
Keyword(s):  
Rural Areas ◽  
Oxygen Demand ◽  
Leachate Treatment ◽  
Surface Deposit ◽  
Treatment Unit ◽  
Sludge Treatment ◽  
Reed Beds ◽  
The Right ◽  
High Deformability

Abstract Sustainable treatment and management of fecal sludge in rural areas require adapted solutions. Rustic and simple operating processes such as sludge treatment reed beds (STRB) have been increasingly considered for this purpose. The biggest full scale (2,600 m2 of STRB) septage treatment unit in France had been built in Nègrepelisse with the final objectives of reusing treated sludge and leachates for agriculture spreading and tree irrigation, respectively. The aim of this investigation was to validate the treatment chain of this installation. The obtained field data showed firstly that the overall removal efficiencies of STRB were satisfactory and stable. Removal rates higher than 98% for chemical oxygen demand and suspended solids and a 95% for Kjeldahl nitrogen represented so far a beneficial septage treatment by STRB. The highlighted necessity of a suitable complementary leachate treatment (before tree irrigation) justified the presence of the second stage of vertical flow constructed wetland. The sludge deposit drying and mineralization efficiencies were on the right track. According to hydrotextural diagram analysis, surface deposit was however found to have high deformability probably due to the youth of the installation. An in-depth understanding of STRB system needs continuous long-term studies.

SBR treatment of olive mill wastewaters: dilution or pre-treatment?

2012 ◽  
Vol 65 (9) ◽  
pp. 1684-1691 ◽  
Author(s):  
G. Farabegoli ◽  
A. Chiavola ◽  
E. Rolle
Keyword(s):  
Biological Process ◽  
Batch Reactor ◽  
Oxygen Demand ◽  
Adequate Treatment ◽  
Olive Mill Wastewaters ◽  
Other Substances ◽  
Removal Efficiencies ◽  
Pre Treatment ◽  
Olive Mill ◽  
Gac Adsorption

The olive-oil extraction industry is an economically important activity for many countries of the Mediterranean Sea area, with Spain, Greece and Italy being the major producers. This activity, however, may represent a serious environmental problem due to the discharge of highly polluted effluents, usually referred to as ‘olive mill wastewaters’ (OMWs). They are characterized by high values of chemical oxygen demand (COD) (80–300 g/L), lipids, total polyphenols (TPP), tannins and other substances difficult to degrade. An adequate treatment before discharging is therefore required to reduce the pollutant load. The aim of the present paper was to evaluate performances of a biological process in a sequencing batch reactor (SBR) fed with pre-treated OMWs. Pre-treatment consisted of a combined acid cracking (AC) and granular activated carbon (GAC) adsorption process. The efficiency of the system was compared with that of an identical SBR fed with the raw wastewater only diluted. Combined AC and GAC adsorption was chosen to be used prior to the following biological process due to its capability of providing high removal efficiencies of COD and TPP and also appreciable improvement of biodegradability. Comparing results obtained with different influents showed that best performances of the SBR were obtained by feeding it with raw diluted OMWs (dOMWs) and at the lowest dilution ratio (1:25): in this case, the removal efficiencies were 90 and 76%, as average, for COD and TPP, respectively. Feeding the SBR with either the pre-treated or the raw dOMWs at 1:50 gave very similar values of COD reduction (74%); however, an improvement of the TPP removal was observed in the former case.

Use of dairy reject and fermented Aleo sp. Leaf Gel mixture in the biological Pre-treatment of landfill leachate

2018 ◽  
Vol 13 (1) ◽  
pp. 219-228 ◽  
Author(s):  
Kasmi Mariam ◽  
Elleuch Lobna ◽  
Abidi Haifa ◽  
Cherni Yassmine ◽  
Hosni Cyrine ◽  
...  
Keyword(s):  
Saccharomyces Cerevisiae ◽  
Organic Matter ◽  
Size Effect ◽  
Landfill Leachate ◽  
Yeast Strain ◽  
Oxygen Demand ◽  
Treatment Efficiency ◽  
Chemical Oxygen Demand Removal ◽  
Pre Treatment ◽  
Aloe Gel

Abstract In this study the biotreatability of Jebel Chakir landfill leachate (Tunisia) using a mixture of dairy industry reject (bactofugate) and Aloe sp. leaf gel was evaluated. The effect of Aloe gel fermentation using Saccharomyces cerevisiae yeast strain was investigated against some selected bacterial and fungal strains. The inoculation size effect of the treatment mixtures (2, 6, 10 and 12%) in the treatment efficiency was also studied. The obtained results showed that when natural Aloe gel and bactofugate mixtures were used the recorded chemical oxygen demand removal rates exceeded 56% within 48 h of treatment. Whereas, the use of the fermented Aloe gel in the treatment mixtures has promoted the organic matter removal to reach 72%.

Ozonation With Catalyst in Landfill Leachate Treatment

2019 ◽  
pp. 324-354
Author(s):  
Siti Nor Farhana Zakaria
Keyword(s):  
Molecular Structure ◽  
Hydrogen Peroxide ◽  
Hydroxyl Radical ◽  
Chemical Oxygen Demand ◽  
Human Health ◽  
Chemical Reaction ◽  
Landfill Leachate ◽  
Treatment Cost ◽  
Oxygen Demand ◽  
Leachate Treatment

Landfill leachate is a hazardous pollutant generated from a landfill site. Discharge of landfill leachate has caused a major contamination to the environment and detrimental to human health. This chapter introduces an alternative method to treat recalcitrant pollutant in leachate by using ozonation with catalyst. The production of hydroxyl radical in ozonation was not enough to oxidize complex molecular structure in the leachate. Theoretically, the addition of catalyst enhances the capacity of radical and accelerates the chemical reaction. The effectiveness of ozonation with Fenton (O3/Fenton), hydrogen peroxide (O3/H2O2), and zirconium tetrachloride (O3/ZrCl4) in removing pollutant such as chemical oxygen demand (COD), color, and improvement of biodegradability by using this process were also discussed in this chapter. Comparison in term of treatment cost and benefits of the application of chemical as catalyst are briefly elaborated at the end of this chapter.

Integrated Leachate Treatment Technology

2020 ◽  
pp. 204-220
Author(s):  
Zawawi Daud ◽  
Halizah Awang
Keyword(s):  
Organic Compounds ◽  
Landfill Leachate ◽  
Combined Treatment ◽  
Treatment Technology ◽  
Leachate Treatment ◽  
Chemical Treatments ◽  
Physico Chemical ◽  
Effective Removal ◽  
Removal Of Heavy Metals ◽  
Pre Treatment

In this chapter, the performance of combined treatment of municipal landfill leachate is reviewed. Although individual physico-chemical treatments are suitable for the removal of heavy metals and hydrolyzation of some organic compounds, a combination of two physico-chemical treatments or physico-chemical and biological is required for optimum treatment of stabilized landfill leachate. A combination of two physico-chemical treatments can give optimum results in removal of recalcitrant organic compounds from stabilized leachate, as reflected by a significant decrease of the COD values after treatment. On the other hand, a combination of physico-chemical and biological treatments is required to achieve effective removal of NH3-N and COD with a substantial amount of biodegradable organic matter. In many cases, physico-chemical treatments are suitable for pre-treatment of stabilized leachate. The objective of this paper is to highlight various types of integrated leachate treatments as it has been difficult to get optimum efficiency from single approached treatment.

scholarly journals Application of Anaerobic and Ozonation Processes in the Landfill Leachate Treatment

2006 ◽  
Vol 1 (3) ◽  
Author(s):  
A. Vilar ◽  
S. Gil ◽  
M. A. Aparicio ◽  
C. Kennes ◽  
M. C. Veiga
Keyword(s):  
Organic Matter ◽  
Landfill Leachate ◽  
Biological System ◽  
Contact Time ◽  
Treatment Process ◽  
Tap Water ◽  
Leachate Treatment ◽  
Ozone Dose ◽  
Pre Treatment ◽  
Ozonation Process

The optimization of leachate treatment was investigated as well as the configuration of a biological-ozonation process. The leachate used for the experiments was diluted to 1/5 with tap water and treated anaerobically. The anaerobic effluent and the raw leachate were treated with ozone in order to increase their biodegradability getting the minimum organic matter removal. Both were submitted to the ozonation process, applying a constant ozone dose and varying the contact time. The ozonation of raw leachate produced a decrease of COD and BOD5 concentrations as well as BOD5/COD ratios, applying an ozone dose of 38.72 mg/L·min and contact times between 15 and 60 minutes. Ozonation as a pre-treatment process to the biological system did not improve the biodegradability of the raw leachate. The anaerobic effluent from the reactor fed with leachate diluted to 1/5, was subjected to an ozone dose of 34.99 mg/L·min and applying different contact times. BODf values increased from 74.75 up to 1220 mg/L and BODf/COD ratios reached values higher than 1. Then, the application of ozone to the anaerobic effluent led to the improvement of the biodegradability of the leachate as well as the BODf/COD ratio for all the contact times used.

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