Leaching Behaviour of Synthetic Leachate through a Sewage Sludge and Red Gypsum Composite as Intermediate Landfill Cover
This paper examines the environmental impact of the use of compacted sewage sludge:red gypsum (SS:RG) mixture as intermediate landfill cover in terms of yield and quality of leachate as characterised by hydraulic conductivity and leaching behaviour. A series of column tests using the constant head m...
Saved in:
| Main Authors: | , , , , |
|---|---|
| Other Authors: | |
| Format: | Article |
| Published: |
MDPI
2024
|
| Subjects: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| id |
my.uniten.dspace-34270 |
|---|---|
| record_format |
dspace |
| spelling |
my.uniten.dspace-342702024-10-14T11:18:45Z Leaching Behaviour of Synthetic Leachate through a Sewage Sludge and Red Gypsum Composite as Intermediate Landfill Cover Rosli N.A. Abdul Aziz H. Kueh A.B.H. Lim L.L.P. Zawawi M.H. 57209705073 7005960760 16202991500 28567885800 39162217600 degree of compaction hydraulic conductivity intermediate landfill cover leaching behaviour compaction compressive strength gypsum heavy metal hydraulic conductivity landfill leaching porosity sludge This paper examines the environmental impact of the use of compacted sewage sludge:red gypsum (SS:RG) mixture as intermediate landfill cover in terms of yield and quality of leachate as characterised by hydraulic conductivity and leaching behaviour. A series of column tests using the constant head method is carried out by percolating the synthetic leachate through samples that have been compacted at various degrees (60, 70, 75, 80 and 85%). The leachate quality is monitored at pre-determined days for pH, COD, Cu, Fe and Zn. In general, hydraulic conductivity decreases in three stages, in which the first stage is mainly attributed to the particle rearrangement and hydration of calcium silicate hydrate (CSH). The hydration of CSH increases the pH, which causes the heavy metal to precipitate and be entrapped within the matrices of CSH gel, thereby further reducing the porosity and hydraulic conductivity. A minimum of 75% compaction has shown favourable final porosity, hydraulic conductivity, and leachate quality, although a minimum of 80% compaction is recommended in order to achieve a satisfactory compressive strength of greater than 345 kPa for a landfill operation. � 2023 by the authors. Final 2024-10-14T03:18:45Z 2024-10-14T03:18:45Z 2023 Article 10.3390/su15054229 2-s2.0-85149912047 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85149912047&doi=10.3390%2fsu15054229&partnerID=40&md5=82ef14262ebfb3e96b6d0315476e77e4 https://irepository.uniten.edu.my/handle/123456789/34270 15 5 4229 All Open Access Gold Open Access MDPI Scopus |
| institution |
Universiti Tenaga Nasional |
| building |
UNITEN Library |
| collection |
Institutional Repository |
| continent |
Asia |
| country |
Malaysia |
| content_provider |
Universiti Tenaga Nasional |
| content_source |
UNITEN Institutional Repository |
| url_provider |
http://dspace.uniten.edu.my/ |
| topic |
degree of compaction hydraulic conductivity intermediate landfill cover leaching behaviour compaction compressive strength gypsum heavy metal hydraulic conductivity landfill leaching porosity sludge |
| spellingShingle |
degree of compaction hydraulic conductivity intermediate landfill cover leaching behaviour compaction compressive strength gypsum heavy metal hydraulic conductivity landfill leaching porosity sludge Rosli N.A. Abdul Aziz H. Kueh A.B.H. Lim L.L.P. Zawawi M.H. Leaching Behaviour of Synthetic Leachate through a Sewage Sludge and Red Gypsum Composite as Intermediate Landfill Cover |
| description |
This paper examines the environmental impact of the use of compacted sewage sludge:red gypsum (SS:RG) mixture as intermediate landfill cover in terms of yield and quality of leachate as characterised by hydraulic conductivity and leaching behaviour. A series of column tests using the constant head method is carried out by percolating the synthetic leachate through samples that have been compacted at various degrees (60, 70, 75, 80 and 85%). The leachate quality is monitored at pre-determined days for pH, COD, Cu, Fe and Zn. In general, hydraulic conductivity decreases in three stages, in which the first stage is mainly attributed to the particle rearrangement and hydration of calcium silicate hydrate (CSH). The hydration of CSH increases the pH, which causes the heavy metal to precipitate and be entrapped within the matrices of CSH gel, thereby further reducing the porosity and hydraulic conductivity. A minimum of 75% compaction has shown favourable final porosity, hydraulic conductivity, and leachate quality, although a minimum of 80% compaction is recommended in order to achieve a satisfactory compressive strength of greater than 345 kPa for a landfill operation. � 2023 by the authors. |
| author2 |
57209705073 |
| author_facet |
57209705073 Rosli N.A. Abdul Aziz H. Kueh A.B.H. Lim L.L.P. Zawawi M.H. |
| format |
Article |
| author |
Rosli N.A. Abdul Aziz H. Kueh A.B.H. Lim L.L.P. Zawawi M.H. |
| author_sort |
Rosli N.A. |
| title |
Leaching Behaviour of Synthetic Leachate through a Sewage Sludge and Red Gypsum Composite as Intermediate Landfill Cover |
| title_short |
Leaching Behaviour of Synthetic Leachate through a Sewage Sludge and Red Gypsum Composite as Intermediate Landfill Cover |
| title_full |
Leaching Behaviour of Synthetic Leachate through a Sewage Sludge and Red Gypsum Composite as Intermediate Landfill Cover |
| title_fullStr |
Leaching Behaviour of Synthetic Leachate through a Sewage Sludge and Red Gypsum Composite as Intermediate Landfill Cover |
| title_full_unstemmed |
Leaching Behaviour of Synthetic Leachate through a Sewage Sludge and Red Gypsum Composite as Intermediate Landfill Cover |
| title_sort |
leaching behaviour of synthetic leachate through a sewage sludge and red gypsum composite as intermediate landfill cover |
| publisher |
MDPI |
| publishDate |
2024 |
| _version_ |
1814060080745676800 |
| score |
13.222552 |