Eco-efficiency analysis of sludge treatment scenarios in urban cities: the case of Hong Kong

Lam, Chor Man; Lee, Po‐Heng; Hsu, Shu-Chien

doi:10.1016/j.jclepro.2015.10.125

Cited by 29 publications

(9 citation statements)

References 26 publications

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“…Nevertheless, anaerobic digestion as a stabilization process to promote sludge treatment can improve the energy efficiency and the economic benefits since the energy efficiency in the single process of AD can reach over 40% and the products sales are estimated to be around 26 million USD/year, which also show the potential of AD for the combination with other effective sludge treatment technologies for more sustainable management. Similar results were suggested in the previous studies as well, , which also indicates the reliability of the evaluation results and final decision-making results in this paper.…”

Section: Results Analysissupporting

confidence: 91%

Sludge Valorization Process for Waste-to-Value-Added Products: Process Simulation, Sustainability Assessment, and Fuzzy Multi-Criteria Decision Making

Liu

Shi

Yang

et al. 2022

ACS Sustainable Chem. Eng.

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In this paper, a decision-making framework based on process simulation and the fuzzy PROMETHEE II method was proposed to evaluate the performances of the waste management alternatives considering the situation of lacking data and uncertainty. Process simulation and fuzzy multi-criteria decisionmaking methods were applied to deal with the problem of insufficient data and uncertain information from linguistic descriptions. First, a criteria system covering environmental, economic, technical, and social aspects was established for sustainability evaluation. Then, sustainability assessment was conducted based on the results of process simulation. The fuzzy best−worst method was applied to obtain the fuzzy weights for the criteria based on the preferences of stakeholders, and the fuzzy PROMETHEE II approach was presented to generate the ranking for all the alternatives. A case study for the prioritization of sludge-to-energy technologies was carried out to demonstrate the feasibility of the proposed framework. Sensitivity analysis and uncertainty analysis were also conducted to verify the stability and robustness of the model. Results indicate the effectiveness of the proposed model on providing reference for the waste-to-energy alternatives ranking and giving constructive suggestions for the industry and future research directions. The constructed model can not only provide useful references for decision-makers but also can inspire researchers to investigate biomass management technologies in a similar framework, and the application may even extend to other fields.

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Section: Results Analysissupporting

confidence: 91%

Sludge Valorization Process for Waste-to-Value-Added Products: Process Simulation, Sustainability Assessment, and Fuzzy Multi-Criteria Decision Making

Liu

Shi

Yang

et al. 2022

ACS Sustainable Chem. Eng.

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“…The SO 3 content is determined by semi-quantitative analysis to be .749%. Lam et al (2016) reported that the main components in ISA are Al, Si, Fe, Ca, P, and Na. In addition, the findings demonstrate that silicon dioxide Frontiers in Materials frontiersin.org (SiO 2 ) and calcium oxide (CaO) make up the majority of the TLF.…”

Section: Physical and Chemical Propertiesmentioning

confidence: 99%

“…The management and disposal of sewage sludge from sewage treatment facilities have grown to be a significant issue in high population density cities all over the world. This has led to growing environmental and economic issues (Lam et al, 2016). The ash from the incinerated sewage sludge is a waste product of the combustion of sludge during wastewater treatment.…”

Section: Introductionmentioning

confidence: 99%

Application of paper sludge ash and incinerated sewage ash in emulsified asphalt cold mixtures

et al. 2023

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Certain disadvantages could have appeared while using hot mix asphalt (HMA), such as the release of unhealthy gases into the environment (environmental issues), difficulty in sustaining the temperature over long distances (logistical issues), and consuming a sufficient amount of energy while preparing and laying down (practical and economic issues). To overcome the aforementioned issues, this study aimed to develop rapid-curing emulsified asphalt cold mixes (EACM) comprising a cementitious filler made from industrial by-product materials. Paper sludge ash (PSA) is used as an active filler for application in the EACM rather than conventional mineral filler. Additionally, to maximize the effect of PSA’s hydraulic activity, incinerated sewage ash (ISA) is utilized as an activator at a concentration of 0%–4% by mass of the aggregates. The results demonstrate that the use of waste PSA significantly improves the indirect tensile stiffness modulus (ITSM) by around 10 times more after 2 days than the traditional emulsified asphalt cold mixes. In addition, the improvement in ITSM was around 30% and 65% for 6%PSA+1%ISA and 6%PSA+4%ISA mixes, respectively. Furthermore, the rutting for the 6%PSA+1%ISA and 6%PSA+4%ISA mixes decreased to around 19% and 11% in comparison to the traditional 131-pen HMA. The formation of hydration products and rapid demulsification of asphalt emulsion, which results in binding within the mixtures, are responsible for the increased ITSM and rutting resistance. As a result, environmental issues are minimized, and energy preservation may be maintained.

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“…Despite landfilling being a favorable technique in Astana city, problems with the land space have become notable. Hence, incineration has to be applied in the near future, as it also has a high potential for energy recovery from SS [42]. The net GHG emissions in Scenario 2 and 3 were calculated using The sewage sludge management scenarios include landfilling, incineration, and coincineration.…”

Section: Msw Management Scenarios Ss Management Scenariosmentioning

confidence: 99%

Greenhouse Gas Emissions-Based Development and Characterization of Optimal Scenarios for Municipal Solid and Sewage Sludge Waste Management in Astana City

et al. 2022

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Landfilling is the most applied solid waste management method in developing countries, which leads to a large amount of greenhouse gas (GHG) emissions. It is thus imperative to develop strategies for evaluating different economically viable waste management scenarios to mitigate GHG emissions. According to the Paris Agreement, Kazakhstan planned to decrease GHG emissions by 25% by 2050 as compared to 1990 levels, while reaching carbon neutrality by 2060. In this context, we herein propose four different scenarios for municipal solid waste (MSW) treatment and three scenarios for sewage sludge (SS) treatment with the aim of evaluating the GHG potential for Astana, the capital city of Kazakhstan, using the (solid waste management) SWM-GHG calculator developed by the Institute for Energy and Environmental Research. The MSW treatment scenarios include: (A) 15% recycling of secondary materials and 85% landfilling of remaining MSW; (B) 30% recycling of secondary materials; 70% sanitary landfilling with biogas collection; (C) 30% recycling and 70% biological stabilization and landfilling without biogas collection; and (D) 30% recycling, 20% composting, and 50% (waste-to-energy) WtE incineration. The sewage sludge management scenarios include (1) 100% landfilling; (2) 100% WtE incineration; and (3) co-incineration of sewage sludge and coal. The results reveal that more complex scenarios lead to extensive ecological benefits; however, there are economic constraints. Based on the analysis of the proposed scenarios, we recommend the optimal strategy for MSW treatment to be 30% recycling with biological stabilization that has a total cost of EUR 16.7 million/year and overall GHG emissions of −120 kt of CO2 eq/year. In terms of sewage sludge management, the addition of coal to sewage sludge simplifies the combustion process due to the higher heat capacity. Considering lower cost and higher energy recovery, it is recommended as a favorable process.

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Eco-efficiency analysis of sludge treatment scenarios in urban cities: the case of Hong Kong

Cited by 29 publications

References 26 publications

Sludge Valorization Process for Waste-to-Value-Added Products: Process Simulation, Sustainability Assessment, and Fuzzy Multi-Criteria Decision Making

Sludge Valorization Process for Waste-to-Value-Added Products: Process Simulation, Sustainability Assessment, and Fuzzy Multi-Criteria Decision Making

Application of paper sludge ash and incinerated sewage ash in emulsified asphalt cold mixtures

Greenhouse Gas Emissions-Based Development and Characterization of Optimal Scenarios for Municipal Solid and Sewage Sludge Waste Management in Astana City

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