A mixture of sewage sludge and red gypsum as an alternative material for temporary landfill cover

Rosli, Nor Azalina; Aziz, Hamidi Abdul; Selamat, Mohamad Razip; Lim, Leonard Lik Pueh

doi:10.1016/j.jenvman.2020.110420

Cited by 31 publications

(4 citation statements)

References 30 publications

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“…For dredged sludge with heavy metal concentrations that greatly exceed the applicable standards, the concentration of heavy metals in the pore water should be reduced before the sludge is landfilled. Where rainfall in the region of a landfill is abundant, a cover layer should be arranged on the sludge surface following the sludge disposal process [18]. Landfill covering should be conducted after the sludge is processed to control rainwater infiltration with an impervious barrier [19].…”

Section: Discussionmentioning

confidence: 99%

Numerical Evaluation and Management Suggestions for Heavy Metal Pollution Risks in a Sludge Landfill: A Case Study from Fuyong Landfill, Shenzhen, China

Sun

Shu

2020

Advances in Civil Engineering

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Despite the extensive attention paid to the transport of heavy metals in sludge landfills, the processes of transporting these pollutants from a landfill to the underground environment are quite complicated and subject to significant uncertainty. In this study, the transport of typical heavy metal pollutants in a sludge landfill through saturated and unsaturated soil zones during rainfall was investigated via numerical modeling. The objectives of the study are to evaluate the heavy metal pollution risk from a sludge landfill under rainfall infiltration conditions and to propose several management suggestions. The results indicate that, during rainfall, heavy metal concentrations at the top of the unsaturated sludge layer decrease rapidly, but they decrease more gradually at the bottom of the layer. The maximum concentration appears in vertical distribution and decreases gradually through the saturated zone. Nickel is the first heavy metal pollutant to break through the low-permeability natural silt barrier. The transport parameters not only influence the simulated time for heavy metal pollutants to break through the silt layer and cause underground environmental pollution but also affect the extent to which the heavy metal pollutants in pore water exceed the guidelines. On the basis of these results, for dredged sludge with heavy metal concentrations significantly exceeding the standard, the concentration of heavy metals in pore water should be reduced before the sludge is landfilled, and a covering layer should be established on the sludge surface to control rainfall infiltration.

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Section: Discussionmentioning

confidence: 99%

Numerical Evaluation and Management Suggestions for Heavy Metal Pollution Risks in a Sludge Landfill: A Case Study from Fuyong Landfill, Shenzhen, China

Sun

Shu

2020

Advances in Civil Engineering

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“…The composite of sewage sludge (SS) and red gypsum (RG) at a weight ratio of 1:1 [31] was used as a sample in the column study. The selection of the composition was based on the result obtained from the previous study [31], in which 1SS:1RG is the ideal mix ratio to have a Ca:Si composition closest to 3 with comparable performance to that of soil as landfill cover. At other ratios, the lesser content of Ca or Si becomes the limiting factor for forming CSH gel, resulting in poorer performance.…”

Section: Composite Sample Preparationmentioning

confidence: 99%

Leaching Behaviour of Synthetic Leachate through a Sewage Sludge and Red Gypsum Composite as Intermediate Landfill Cover

et al. 2023

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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.

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“…Penelitian Sun, T 2023 yang mengkaji mengenai dampak lumpur kota yang memadat sebagai temporary landfill cover menemukan bahwa permeabilitas lapisan penutup mempengaruhi distribusi air lindi dan ketinggian genangan air [5]. Penelitian Nor A., 2020 dengan fokus penambahan red gypsum pada limbah lumpur sebagai temporary landfill cover menemukan bahwa komposisi limbah lumpur dan gypsum merah tidak mempengaruhi konduktivitas hidrolik temporary landfill cover, yang berada pada kisaran 10 -5 cm/s untuk semua campuran [17].…”

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Permeabilitas Tanah Lanau Sebagai Temporary Landfill Cover yang Distabilisasi dengan Bakteri dan Larutan Sementasi

Rahmadi,

Indriani,

Utomo

2023

JURMATEKS

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In the development of waste management, piles of rubbish can produce liquid waste called leachate. Leachate from landfills can affect human health and pollute the environment and aquatic biota because leachate contains various chemical compounds and many pathogenic bacteria. To minimize the impact of landfill waste on the surrounding environment, the waste is covered with material that can isolate it from the surrounding environment. This research aims to determine the optimal level of cementation solution addition to waste sludge as temporary landfill cover using the MICP method. The research results reveal that the sample permeability meets the criteria for a temporary cover landfill, where the permeability specification limits are between 10-4 to 10-5 cm/s. The research revealed that 0.25M cementation solution and Bacillus Subtilis bacteria had the lowest permeability. Soil without cementation solution has a permeability coefficient value of 5.04×10-4 cm/s, and decreases to 6.67×10-5 cm/s with a cementation solution concentration of 0.25M over a 28-day peram period. Variations in the 0.25M cementation solution showed its ability to reduce soil permeability by up to 86.7%. Permeability has decreased, which means the soil pores are getting smaller. Thus, this addition can reduce soil permeability and minimize the possibility of environmental damage by leachate.

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A mixture of sewage sludge and red gypsum as an alternative material for temporary landfill cover

Cited by 31 publications

References 30 publications

Numerical Evaluation and Management Suggestions for Heavy Metal Pollution Risks in a Sludge Landfill: A Case Study from Fuyong Landfill, Shenzhen, China

Numerical Evaluation and Management Suggestions for Heavy Metal Pollution Risks in a Sludge Landfill: A Case Study from Fuyong Landfill, Shenzhen, China

Leaching Behaviour of Synthetic Leachate through a Sewage Sludge and Red Gypsum Composite as Intermediate Landfill Cover

Permeabilitas Tanah Lanau Sebagai Temporary Landfill Cover yang Distabilisasi dengan Bakteri dan Larutan Sementasi

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