城市污泥通过热解利用资源:对水泥性能和环境安全的影响
Fangzhen Hu1, Shanjun Zhang1, Jing Liu1
1School of Architectural Engineering Wuhan City Polytechnic Wuhan 430068 China 02009028@whcp.edu.cn.
RSC advances
|January 21, 2026
概括
热解将城市污泥转化为稳定,多孔材料,增强水泥性能. 这种烧化污泥提高了混凝土的强度,是安全的,可行的添加剂.
科学领域:
- 材料科学 材料科学 材料科学
- 环境工程 环境工程
- 化学工程是化学工程的重要组成部分.
背景情况:
- 城市污泥带来了处理方面的挑战.
- 废物利用对可持续性至关重要.
- 热解提供了一种污泥处理和资源回收的方法.
研究的目的:
- 研究城市污泥通过热解转化为热解污泥的过程.
- 评价烧化污泥在基材料中作为添加剂的应用.
- 评估热解温度对污泥特性及其在混凝土中的性能的影响.
主要方法:
- 城市污泥在300°C至600°C的温度下被烧化.
- 烧化污泥的特征包括产量,灰含量,特定表面积和pH值.
- 性能评估涉及将烧化污泥纳入基于水泥的材料,并测试机械性能 (压力和裂变抗拉强度).
- 通过重金属漏试验进行了环境风险评估.
主要成果:
- 热解产量下降,而灰含量和特定表面积随着温度的增加而增加.
- 烧化污泥表现出稳定的性pH值和多孔结构.
- 未经处理的污泥对水泥性能产生了负面影响,而烧化污泥则提高了机械强度 (3天后高达37%,28天后高达35%).
- 烧化污泥增强了裂变拉伸强度,与未经处理的污泥不同.
- 环境风险评估证实重金属漏处于安全范围内.
结论:
- 热解有效地减少和稳定城市污泥.
- 烧化污泥作为有益的添加剂,改善了基于水泥的材料的机械性能.
- 化城市污泥是一种可行且环保的资源,可作为水泥添加剂使用.
相关概念视频
01:24Hydration of Cement
843
Hydration of cement is a chemical reaction between cement particles and water. This process occurs primarily through two mechanisms: through-solution and topochemical. In the through-solution process, anhydrous compounds dissolve into their constituents, hydrates form in the solution, and then precipitate from the supersaturated solution. The topochemical process involves solid-state reactions at the cement particle surface. The through-solution process dominates the topochemical process at the...
843
01:17Soundness of Cement
543
The soundness of cement refers to the ability of cement paste to retain its volume after setting. Unsound cement can lead to expansion and structural damage due to the presence of free lime, magnesia, and calcium sulfate. Free lime hydrates very slowly, expanding and causing unsoundness, which is difficult to detect because it intercrystallizes with other compounds. Magnesia also reacts with water, forming crystals that can disrupt the cement's structure. Calcium sulfate can create...
543
02:12Short-distance Transport of Resources
17.5K
Short-distance transport refers to transport that occurs over a distance of just 2-3 cells, crossing the plasma membrane in the process. Small uncharged molecules, such as oxygen, carbon dioxide, and water, can diffuse across the plasma membrane on their own. In contrast, ions and larger molecules require the assistance of transport proteins due to their charge or size. Transport across membranes also occurs within individual cells, playing a variety of essential roles for the plant as a whole.
17.5K
01:28Survey Safety
374
Surveying near highways, rough terrain, or power lines involves significant risks. Working along highways is particularly dangerous and requires the use of warning signs and flagmen. It is safest to avoid working directly on roads and use offsets whenever possible. When highway work is unavoidable, it must follow all safety guidelines. Surveyors should wear bright clothing, such as orange reflective vests, to ensure visibility to motorists, coworkers, and hunters. In construction zones, wearing...
374
01:21Portland Cement
632
Portland cement is the essential binding ingredient in concrete, made from finely ground materials including lime, iron, silica, and alumina. Lime is derived primarily from limestone, marble, marl, seashells, and clays, which also supply iron and alumina, while silica is sourced from sand, chalk, and bauxite. Contemporary manufacturing of Portland cement is a significant source of carbon dioxide emissions, prompting research into reducing its content in concrete through alternative...
632
01:15Fineness of Cement
476
The fineness of cement directly influences the rate of hydration, as the hydration begins at the surface of the cement particles. In addition to hydration, the fineness of cement is vital for various properties of concrete including workability, gypsum requirement, and long-term behavior. The fineness of cement is represented in terms of the specific surface of cement which is typically measured in square meters per kilogram, with several methods available for this determination.
Direct...
Direct...
476