Potential Use of Dimocarpus longan Seeds as a Flocculant in Landfill Leachate Treatment

Landfill leachate is a highly polluted and generated from water infiltration through solid waste produced domestically and industrially. In this study, a coagulation–flocculation process using a combination of Polyaluminium chloride (PACl) as a coagulant and Dimocarpus longan seed powder (LSP) as coagulant aid was used in treating landfill leachate. LSP has been tested as the main coagulant and as coagulant aid with PACl. As the main coagulant, the optimum dosage and pH for PACl were 5 g/L and 6, respectively, with removal efficiencies of 67.44%, 99.47%, and 98% for COD, SS, and color, respectively. For LSP as the main coagulant, results show that LSP is not effective where the removal efficiencies obtained for COD, SS, and color were 39.40%, 22.20%, and 28.30%, respectively, with the optimum dosage of 2 g/L and pH 4. The maximum removal efficiencies of COD, SS, and color were 69.19%, 99.50%, and 98.80%, respectively, when LSP was used as coagulant aid with PACl. Results show that using LSP as coagulant aid was found to be more effective in the removal of COD, SS, and color with less PACl dosage. The PACl dosage was decreased from 5 to 2.75 g/L when LSP was used as a coagulant aid. Cost estimation for using PACl alone and using LSP as the coagulant aid showed a reduction in the cost of approximately 40% of the cost of using PACl alone. Overall, this study confirmed the efficiency of LSP to be used as a natural coagulant aid in leachate treatment.

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Cost estimation of landfill leachate treatment by reverse osmosis in a Brazilian landfill

Waste Management & Research ◽

10.1177/0734242x20928411 ◽

2020 ◽

Vol 38 (10) ◽

pp. 1087-1092

Author(s):

Ronei de Almeida ◽

Daniele Maia Bila ◽

Bianca Ramalho Quintaes ◽

Juacyara Carbonelli Campos

Keyword(s):

Reverse Osmosis ◽

Landfill Leachate ◽

Cost Estimation ◽

Full Scale ◽

Membrane Process ◽

Total Treatment Cost ◽

Leachate Treatment ◽

Total Treatment ◽

The Cost ◽

Janeiro State

The reverse osmosis (RO) process has been increasingly applied to landfill leachate treatment. The published literature reports several studies that investigated the technical feasibility of RO. However, information about process costs is scarce. Also, companies that run leachate treatment plants do not provide actual costs. To fill this gap, this study aimed to evaluate the treatment costs of a full-scale RO for the treatment of landfill leachate located in Rio de Janeiro State, Brazil. A procedure was proposed to estimate the capital expenses (CAPEX), operational expenses (OPEX), and specific total treatment cost, the total cost per m3 of treated leachate, of the leachate treatment by membrane process, and the results obtained are discussed. The CAPEX for this full-scale RO was estimated at MUS$ 1.413, and OPEX ranged from US$ 0.132 to US$ 0.265 m−3 per year. The cost of leachate treatment has been estimated at US$ 8.58 m−3 considering the operation of the RO-unit for 20 years after landfill closure.

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Optimization of Coagulation-Flocculation Process of Landfill Leachate by Tin (IV) Chloride Using Response Surface Methodology

Avicenna Journal of Environmental Health Engineering ◽

10.34172/ajehe.2019.06 ◽

2019 ◽

Vol 6 (1) ◽

pp. 41-48 ◽

Cited By ~ 1

Author(s):

Abdul Aziz Hamidi ◽

Syed Zainal Sharifah Farah Fariza ◽

Alazaiza Motasem Y.D

Keyword(s):

Response Surface Methodology ◽

Response Surface ◽

Removal Efficiency ◽

Landfill Leachate ◽

Chemical Properties ◽

Oxygen Demand ◽

Statistical Design ◽

Water Infiltration ◽

Flocculation Process ◽

Maximum Removal

Landfill leachate is highly polluted and generated as a result of water infiltration through solid waste produced domestically and industrially. This study investigated the applicability of the response surface methodology (RSM) to optimize the removal performances of chemical oxygen demand (COD), color, and suspended solids (SS) from landfill leachate by coagulation process using Tin tetrachloride pentahydrate. The leachate samples were collected from Alor Pongsu Landfill (APLS) in Perak, Malaysia. Before starting the experiments, general characterization was carried out for raw leachate samples to investigate their physical and chemical properties. The effects of the dosage and pH of SnCl4 on the removal performances were evaluated as well. An ideal experimental design was performed based on the central composite design (CCD) by RSM. In addition, this RSM was used to evaluate the effects of process variables and their interaction toward the attainment of their optimum conditions. The statistical design of the experiments and data analysis was resolved using the Design-Expert software. Further, the range of coagulant dosage and pH was selected based on a batch study which was conducted at 13000 mg/L to 17000 mg/L of SnCl4 and pH ranged from 6 to 10. The results showed that the optimum pH and dosage of SnCl4 were 7.17 and 15 g/L, respectively, where the maximum removal efficiency was 67.7% for COD and 100% for color and SS. The results were in agreement with the experimental data with a maximum removal efficiency of 67.84 %, 98.6 %, and 99.3%, for COD, color, and SS, respectively. Overall, this study verified that the RSM method was viable for optimizing the operational condition of the coagulation-flocculation process.

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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

Ochrona Srodowiska i Zasobów Naturalnych ◽

10.1515/oszn-2015-0020 ◽

2015 ◽

Vol 26 (3) ◽

pp. 49-53 ◽

Cited By ~ 1

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%.

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Study on anti-scaling of landfill leachate treated by evaporation method

Water Science & Technology ◽

10.2166/wst.2021.210 ◽

2021 ◽

Author(s):

Zhongteng Bai ◽

Yanqiu Wang ◽

Mingjun Shan ◽

Yanli Lv ◽

Guangcai Meng ◽

...

Keyword(s):

Ion Exchange ◽

Cation Exchange ◽

Landfill Leachate ◽

Exchange Resin ◽

Cation Exchange Resin ◽

Field Application ◽

Leachate Treatment ◽

Acid Addition ◽

Pre Treatment ◽

The Cost

Abstract In the mechanical vapor recompression (MVR) treatment of landfill leachate, scaling in the evaporator and heat exchanger poses a serious problem. This study explored the reasons for such scaling and proposed acid or ion-exchange pre-treatments to reduce the alkalinity of the landfill leachate nanofiltration concentrate (LLNC) to prevent scaling. The feasibility of these two methods was evaluated and the technical and economic parameters for application were obtained via experiments. A large amount of HCO3- in the LLNC was the main cause of scaling. The acid addition experiment and field application demonstrated that this method could prevent fouling problems. The cost of acid addition was USD 0.18/t. LLNC pre-treatment by ion-exchange showed that a weakly acidic cation-exchange resin performed better than a strongly acidic cation-exchange resin did. The amount of solid residue under an alkalinity of 0 mg/L could be decreased by 92.9% compared with that of raw LLNC during evaporation. Both methods could alleviate scaling and enable the wide application of the MVR evaporation process in landfill leachate treatment.

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Potential use of oil palm trunk starch as coagulant and coagulant aid in semi-aerobic landfill leachate treatment

Water Quality Research Journal ◽

10.2166/wqrj.2019.041 ◽

2019 ◽

Vol 54 (3) ◽

pp. 203-219 ◽

Cited By ~ 5

Author(s):

Mohd Suffian Yusoff ◽

Hamidi Abdul Aziz ◽

Motasem Y. D. Alazaiza ◽

Lo Ming Rui

Keyword(s):

Landfill Leachate ◽

Oil Palm ◽

Oxygen Demand ◽

Water Infiltration ◽

Optimum Conditions ◽

Leachate Treatment ◽

Polyaluminum Chloride ◽

Oil Palm Trunk ◽

Polluted Wastewater ◽

Potential Use

Abstract Landfill leachate is highly polluted wastewater and generated as a result of water infiltration through solid waste produced domestically and industrially. This study investigates the potential use of oil palm trunk starch (OPTS) and crosslinks oil palm trunk starch (C-OPTS) as coagulant and coagulant aid in tandem with polyaluminum chloride (PAC) for the treatment of landfill leachate. As primary coagulant, the optimum pH and dosage for OPTC were 7 and 500 mg/L, respectively. For C-OPTS, the optimum conditions were pH 8.3 and 1,000 mg/L C-OPTS dosage. However, the optimum conditions for PAC were pH 7 and 8,000 mg/L PAC dosage. Results show that OPTS demonstrated superior feasibility as a selective coagulant targeting heavy metals such as Mn (100% removal), Cu (95.6% removal), Zn (100% removal), and PO43− (100% removal), whereas C-OPTS can be employed as both bulk and selective coagulants. On the other hand, C-OPTS prevailed over PAC in Mn, Zn, PO43−, and chemical oxygen demand (COD) removals by huge margins of 100%, 54.8%, 24.3%, and 17.1%, respectively, without any pH adjustments and with optimum dosage 87.5% lower than that of PAC.

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REMOVAL OF COD AND AMMONIUM FROM LANDFILL LEACHATE BY USING A MODIFIED ECO - BIO – BLOCK MATERIAL IN ANOXIC-OXIC SYSTEM

Vietnam Journal of Science and Technology ◽

10.15625/2525-2518/54/2a/11902 ◽

2018 ◽

Vol 54 (2A) ◽

pp. 1

Author(s):

Hoang Luong

Keyword(s):

Flow Rate ◽

Landfill Leachate ◽

Low Cost ◽

Experimental System ◽

Laboratory Scale ◽

Experimental Results ◽

Leachate Treatment ◽

Removal Efficiencies ◽

Technical Solutions

The research on removal efficiencies of COD and NH4+ in landfill leachate by an application of the modified Eco - Bio -Block (EBB) material in Anoxic-Oxic (A-O) system was conducted in the laboratory scale. The experimental results showed that the treatment efficiencies of COD and NH4+ were relatively high. Removal efficiencies of COD and NH4+ in two columns (anoxic and oxic) were 35% and 50%, respectively, after 19-hour in the experimental system at the flow rate of 1 liter per hour. The results of this study might suggest technical solutions toward landfill leachate treatment at the low cost. Moreover, this method could be widely applied to other wastewater sources suitable in the condition of Vietnam.

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

Water Science & Technology ◽

10.2166/wst.2013.352 ◽

2013 ◽

Vol 68 (5) ◽

pp. 1114-1122 ◽

Cited By ~ 12

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.

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