High temperature slagging gasification demonstration-scale trial of sewage sludge: Feasibility analysis towards mono treatment, operational challenges and life-cycle assessment

IF 7.1 2区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Waste management Pub Date : 2025-06-13 DOI:10.1016/j.wasman.2025.114945

Mei Ping Vernette Chin , Wei Ping Chan , Yinn Zhao Boon , Sofea Al Munawarah Binte Yusoff , Ya Zhao , Stephan Heberlein , Yan Gu , Qinqing Cai , Miao He , James Oh , Guihe Tao , Gurdev Singh , Grzegorz Lisak

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Abstract

The application of high temperature slagging gasification was investigated for treatment of sewage sludge aiming to reduce landfill dependency and create high quality by-product, slag, with excellent heavy metal encapsulation. A demonstration scale facility designed for treatment of municipal solid waste (MSW), with a capacity of 11.5 tonnes a day is applied to assess the operation of the first-of-its-kind mono sewage sludge gasification. This study aims to explore the operational conditions, engineering controls and technical challenges associated with sewage sludge slagging gasification, while assessing the properties of the by-products generated for recycling and reutilization. During mono sludge gasification, higher amounts of biomass charcoal and limestone (CaCO₃) are required to improve the melting of slag and maintain the stability of the gasifier as compared to the usual MSW gasification. Typically used sorbent, slaked lime (Ca(OH)₂), is replaced by sodium bicarbonate (NaHCO₃) to ensure effective removal of acidic gasses from flue gas such as sulfur oxides. Slag generated from sludge demonstrates low leaching of heavy metals, meeting inert waste requirements based on EU landfill standards and shows comparable properties to the MSW slag. The amount of gasification fly ash (GFA) generated for disposal is minimized to only 5.1% of the mass of initial feedstock and is classified as non-hazardous waste acceptable for direct landfill. Life cycle assessment (LCA) provides useful information and critical insights on the competitive advantages and deficiencies of mono sludge slagging gasification, highlight the potential areas for improvement to further enhance the overall environmental performance.

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污水污泥高温结渣气化示范规模试验：单一处理的可行性分析、操作挑战和生命周期评估

研究了高温结渣气化技术在污水污泥处理中的应用，旨在降低对垃圾填埋场的依赖，并产生具有优良重金属包封性的高质量副产物渣。为处理都市固体废物而设计的示范规模设施，每日处理能力为11.5公吨，用以评估首个单一污水污泥气化的运作。本研究旨在探讨与污水污泥结渣气化相关的操作条件、工程控制和技术挑战，同时评估产生的副产品的特性，以进行回收和再利用。在单污泥气化过程中，与通常的城市固体垃圾气化相比，需要更多的生物质木炭和石灰石（CaCO3）来改善炉渣的熔化并保持气化炉的稳定性。通常使用的吸附剂熟石灰（Ca(OH)2）被碳酸氢钠（NaHCO3）取代，以确保有效地去除烟气中的酸性气体，如硫氧化物。从污泥中产生的渣显示出重金属的低浸出，符合基于欧盟填埋场标准的惰性废物要求，并显示出与城市生活垃圾渣相当的性能。气化粉煤灰（GFA）产生的处置量被最小化到仅为初始原料质量的5.1%，并被归类为可接受直接填埋的非危险废物。生命周期评估（LCA）为单一污泥结渣气化的竞争优势和不足提供了有用的信息和重要的见解，突出了潜在的改进领域，以进一步提高整体环境绩效。

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来源期刊

Waste management 环境科学-工程：环境

CiteScore

15.60

自引率

6.20%

发文量

492

审稿时长

39 days

期刊介绍： Waste Management is devoted to the presentation and discussion of information on solid wastes,it covers the entire lifecycle of solid. wastes. Scope: Addresses solid wastes in both industrialized and economically developing countries Covers various types of solid wastes, including: Municipal (e.g., residential, institutional, commercial, light industrial) Agricultural Special (e.g., C and D, healthcare, household hazardous wastes, sewage sludge)