Treatment of Partially Stabilized Landfill Leachate using Combined Ammonia Stripping and GAC Adsorption

Partially stabilized leachate is known to contain contaminants harmful to the environment. The combined physicochemical treatment was generally used to treat these recalcitrant However, the existing technology is still unsatisfactory to fulfil strict discharge limits and is subjected to various oper...

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Main Author:	Lennevey, Kinidi
Format:	Thesis
Language:	English
Published:	2022
Subjects:	TA Engineering (General) Civil engineering (General) TP Chemical technology
Online Access:	http://ir.unimas.my/id/eprint/38712/2/Lennevey.pdf
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spelling	my-unimas-ir.387122024-07-10T03:16:53Z Treatment of Partially Stabilized Landfill Leachate using Combined Ammonia Stripping and GAC Adsorption 2022-06-22 Lennevey, Kinidi TA Engineering (General). Civil engineering (General) TD Environmental technology. Sanitary engineering TP Chemical technology Partially stabilized leachate is known to contain contaminants harmful to the environment. The combined physicochemical treatment was generally used to treat these recalcitrant However, the existing technology is still unsatisfactory to fulfil strict discharge limits and is subjected to various operational issues. This thesis aims to evaluate the effectiveness of combining ammonia stripping and subsequent acidification as a pre-treatment for GAC adsorption and also evaluate the impact of ammonia removal efficiency on the economic cost of the full-scale ammonia stripping system. The partially stabilized leachate was characterized by a high COD (2800 mg/L), UV254 (15.92), and ammonia (920 mg/L) concentration. A response surface methodology (central composite design) was used to optimize the variables such as pH (9-12), air to water ratio (5-10L/Air/min/L-Leachate), and temperature (30-60 oC) for the lab-scale diffused ammonia stripper. Then, the effect of lime (from the ammonia stripping process) and acidification for optimization GAC adsorption was evaluated by varying the lime dosage (0 to 20 g/L) and pH (2 to 12), respectively. Next, the equilibrium isotherms and kinetics of the adsorption process were investigated. Finally, the economic feasibility of the proposed treatment was conducted using Aspenplus®. The optimization process using RSM for the diffused ammonia stripper had predicted the optimum condition for ammonia removal, corresponding to 95.6% ammonia removal. The acidification after lime treatment has significantly improved the adsorption of organics (COD) by more than 90%, showing a significant improvement in the adsorption performance by using the granular activated carbon. The equilibrium and kinetic adsorption follow the Redlich-Peterson isotherms (R2: 0.99902) and pseudo-second-order degree kinetics (R2: 0.993-0.998) The economic optimums for the ammonia stripping and absorption process scale-up simulation were found to be at RM338.66/kg (79.60 US$/kg) of ammonia removed at ammonia concentration of 244 ppm with 95% removal efficiency at an operating temperature of 60 oC. In conclusion, these results demonstrate that the combined process is an effective treatment for the treatment of partially stabilized leachate in complying with strict discharge limits. UNIMAS 2022-06 Thesis http://ir.unimas.my/id/eprint/38712/ http://ir.unimas.my/id/eprint/38712/2/Lennevey.pdf text en validuser phd doctoral UNIVERSITI MALAYSIA SARAWAK Chemical Engineering
institution	Universiti Malaysia Sarawak
collection	UNIMAS Institutional Repository
language	English
topic	TA Engineering (General) Civil engineering (General) TA Engineering (General) Civil engineering (General) TP Chemical technology
spellingShingle	TA Engineering (General) Civil engineering (General) TA Engineering (General) Civil engineering (General) TP Chemical technology Lennevey, Kinidi Treatment of Partially Stabilized Landfill Leachate using Combined Ammonia Stripping and GAC Adsorption
description	Partially stabilized leachate is known to contain contaminants harmful to the environment. The combined physicochemical treatment was generally used to treat these recalcitrant However, the existing technology is still unsatisfactory to fulfil strict discharge limits and is subjected to various operational issues. This thesis aims to evaluate the effectiveness of combining ammonia stripping and subsequent acidification as a pre-treatment for GAC adsorption and also evaluate the impact of ammonia removal efficiency on the economic cost of the full-scale ammonia stripping system. The partially stabilized leachate was characterized by a high COD (2800 mg/L), UV254 (15.92), and ammonia (920 mg/L) concentration. A response surface methodology (central composite design) was used to optimize the variables such as pH (9-12), air to water ratio (5-10L/Air/min/L-Leachate), and temperature (30-60 oC) for the lab-scale diffused ammonia stripper. Then, the effect of lime (from the ammonia stripping process) and acidification for optimization GAC adsorption was evaluated by varying the lime dosage (0 to 20 g/L) and pH (2 to 12), respectively. Next, the equilibrium isotherms and kinetics of the adsorption process were investigated. Finally, the economic feasibility of the proposed treatment was conducted using Aspenplus®. The optimization process using RSM for the diffused ammonia stripper had predicted the optimum condition for ammonia removal, corresponding to 95.6% ammonia removal. The acidification after lime treatment has significantly improved the adsorption of organics (COD) by more than 90%, showing a significant improvement in the adsorption performance by using the granular activated carbon. The equilibrium and kinetic adsorption follow the Redlich-Peterson isotherms (R2: 0.99902) and pseudo-second-order degree kinetics (R2: 0.993-0.998) The economic optimums for the ammonia stripping and absorption process scale-up simulation were found to be at RM338.66/kg (79.60 US$/kg) of ammonia removed at ammonia concentration of 244 ppm with 95% removal efficiency at an operating temperature of 60 oC. In conclusion, these results demonstrate that the combined process is an effective treatment for the treatment of partially stabilized leachate in complying with strict discharge limits.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Lennevey, Kinidi
author_facet	Lennevey, Kinidi
author_sort	Lennevey, Kinidi
title	Treatment of Partially Stabilized Landfill Leachate using Combined Ammonia Stripping and GAC Adsorption
title_short	Treatment of Partially Stabilized Landfill Leachate using Combined Ammonia Stripping and GAC Adsorption
title_full	Treatment of Partially Stabilized Landfill Leachate using Combined Ammonia Stripping and GAC Adsorption
title_fullStr	Treatment of Partially Stabilized Landfill Leachate using Combined Ammonia Stripping and GAC Adsorption
title_full_unstemmed	Treatment of Partially Stabilized Landfill Leachate using Combined Ammonia Stripping and GAC Adsorption
title_sort	treatment of partially stabilized landfill leachate using combined ammonia stripping and gac adsorption
granting_institution	UNIVERSITI MALAYSIA SARAWAK
granting_department	Chemical Engineering
publishDate	2022
url	http://ir.unimas.my/id/eprint/38712/2/Lennevey.pdf
_version_	1804888415179636736

Treatment of Partially Stabilized Landfill Leachate using Combined Ammonia Stripping and GAC Adsorption

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