Physico-chemical treatment of anaerobic landfill leachate using activated carbon and zeolite: batch and column studies

Yusoff

et al. 2020

Water

Self Cite

This work examined the behavior of a novel zeolite augmented on the electrocoagulation process (ZAEP) using an aluminum electrode in the removal of high-strength concentration ammonia (3471 mg/L) from landfill leachate which was saline (15.36 ppt) in nature. For this, a response surfaces methodology (RSM) through central composite designs (CCD) was used to optimize the capability of the treatment process. Design-Expert software (version 11.0.3) was used to evaluate the influences of significant variables such as zeolite dosage (100–120 g), current density (540–660 A/m2), electrolysis duration (55–65 min), and initial pH (8–10) as well as the percentage removal of ammonia. It is noted that the maximum reduction of ammonia was up to 71%, which estimated the optimum working conditions for the treatment process as follows: zeolite dosage of 105 g/L, the current density of 600 A/m2, electrolysis duration of 60 min, and pH 8.20. Furthermore, the regression model indicated a strong relationship between the predicted values and the actual experimental results with a high R2 of 0.9871. These results provide evidence of the ability of the ZAEP treatment as a viable alternative in removing high-strength landfill leachate of adequate salinity without the use of any supporting electrolyte.

Section: Response Surface Methodology Designmentioning

confidence: 99%

Optimization and Analysis of Zeolite Augmented Electrocoagulation Process in the Reduction of High-Strength Ammonia in Saline Landfill Leachate

Hamid

Yusoff

et al. 2020

Water

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“…Langmuir and Freundlich adsorption isotherm models, which have been profitably applied to many adsorption processes [1,15], were used to study the silica sand adsorption behavior. Figures 4 to 6 show the linear plot of Langmuir and Freundlich isotherms for the adsorption of ammoniacal nitrogen, iron, and zinc, respectively, onto silica sand.…”

Section: Adsorption Isothermsmentioning

confidence: 99%

“…Activated carbon is well known as a typical and effective medium that can successfully remove organic substances from landfill leachate. However, the presence of a considerable amount of inorganic substances (indicated by ammoniacal nitrogen), which is difficult to effectively remove by activated carbon, has necessitated investigation into the performance efficiency of numerous low-cost available natural materials, such as zeolite and limestone, as adsorbents [1,15]. In the present study, the treatability of ammoniacal nitrogen, iron, and zinc from semi-aerobic stabilized landfill leachate via low-cost natural silica sand is investigated and documented.…”

Section: Introductionmentioning

confidence: 99%

“…Landfill is the technique employed most worldwide for the disposal of municipal solid waste (MSW) in developing countries such as Malaysia [1][2][3]. After being placed in landfills, solid waste habitually decomposes through a series of combined physicochemical and biological processes.…”

Section: Introductionmentioning

confidence: 99%

“…Lately, an extensive variety of scientific studies, widely covering collection, storage, and suitable treatment of highly contaminated landfill leachate, has been conducted [9]. In light of the literature, adsorption [1,15], air stripping [16], membrane filtration [17], coagulation, flocculation [7], ion exchange [3,18], chemical and electrochemical oxidation methods [19][20], and chemical precipitation [21] are the major common physicochemical treatment methods for stabilized landfill leachate treatment. Among all the above-mentioned methods, adsorption can be classified as the most competent and promising fundamental approach in wastewater treatment.…”

Section: Introductionmentioning

confidence: 99%

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The Effectiveness of Silica Sand in Semi-Aerobic Stabilized Landfill Leachate Treatment

Othman

Yusoff

et al. 2010

Water

Self Cite

This study examines the suitability of natural silica sand as a low-cost adsorbent for the removal of ammoniacal nitrogen and heavy metals, particularly iron and zinc, from semi-aerobic stabilized landfill leachate. Leachate samples were collected from the Pulau Burung landfill site (PBLS) in Penang, Malaysia. The above-mentioned contaminants are highlighted in this study because of their unsafe concentrations at PBLS. The effects of shaking time, settling time, and silica sand dosage on the study parameter removal efficiencies were investigated to predict the performance of the process. The adsorptions of ammoniacal nitrogen, iron, and zinc were judiciously described by Langmuir and Freundlich isotherm models. The optimum removal efficiencies of ammoniacal nitrogen, iron, and zinc obtained were 51%, 44.4%, and 39.2%, respectively, with a shaking time of 90 min, a settling time of 60 min, and with a dosage of 60 g (0.5 kg/L) of silica sand. Based on the coefficient of determination (R 2 ) values obtained from Langmuir and Freundlich isotherm models, ammoniacal nitrogen, iron, and zinc adsorption were better fitted to the Freundlich model.

Study on the adequacy of landfill cover at muassim landfill, makkah, Saudi Arabia

Selamat

Abu-Rizaiza

Env Prog and Sustain Energy

et al. 2012

Self Cite

This study examined the adequacy of an existing sandy landfill cover—1.0 m to 2.3 m in thickness and 0.9 km2 in area—in protecting the waste against rainfall infiltration by testing equivalent cover material at a location away from the site. The landfill is located in Muassim, Makkah—Mecca, in English—Saudi Arabia, while laboratory tests were carried out in Malaysia using simulated sand of equal gradation properties as material of the site. Samples of thicknesses between 0.1 m and 0.9 m were tested in a transparent column, 0.194 m in internal diameter, and applied to the top of the column was 3.31 L of water, the equivalence of 1 year rainfall in Muassim. A container was placed at the bottom of the column to collect water in case of a “breakthrough”. Each experiment was allowed to run for 24 h and measurements were made for “breakthrough” time, volume of water collected over time, and depth of wetted front over time. The veracity of the measurements was verified by carrying out similar tests at site, in the Saudi Arabian landfill, using real cover material. The study suggests that under ideal circumstances, the existing sandy landfill cover probably is capable of protecting the waste body against infiltration. The study also demonstrates the appropriateness of carrying out tests on simulated geotechnical material in a situation when the actual material is not readily available. © 2012 American Institute of Chemical Engineers Environ Prog, 32: 569–575, 2013