三只鸟用一块石头:在1小时内深度干燥下水泥,使用二级灰制造块
Xianghai Kong1, Yanping Zhu2, He Xu2
1College of Environmental Science and Engineering, Donghua University, Shanghai 201620, PR China.
Water research
|September 4, 2024
概括
一种新的污水污泥 (SS) 干燥技术使用二次灰 (SAA) 和NaOH快速降低含水量. 这种方法还将SS转化为适合生产未燃的疏水材料.
科学领域:
- 环境工程 环境工程
- 材料科学 材料科学 材料科学
背景情况:
- 污水污泥 (SS) 由于高湿度,水友性和可压缩性而存在干燥挑战.
- 高效的SS脱水对于资源回收和处置至关重要.
研究的目的:
- 开发一种新,快速,高效的技术,用于深度干燥污水污泥.
- 调查SS干燥过程中二次灰 (SAA) 和NaOH的利用情况.
- 探索干燥的SS在制造未燃的潜力.
主要方法:
- 将二次灰 (SAA) 纳入SS中,以创建多孔通道.
- 将NaOH添加到SAA中,产生快速加热的外热反应 (在60秒内从20°C到105°C).
- 利用现场的低场1H核磁共振 (T1-T2地图) 来监测水的去除,以及低场1H核磁共振 (T1-T2地图) 来确认细胞外聚合物质的分解.
主要成果:
- 在1小时内,SS的水分从75.6%降至38.5%的显著降低.
- 萨亚作为一个骨架,形成道,促进了高效的水蒸发.
- SAA/NaOH反应分解了细胞外聚合物质,使SS成为疏水性,并提高了干燥效率.
- 证明了使用干燥的SS生产未燃的可行性.
结论:
- 开发的SS干燥技术可以快速和深度地去除水分.
- 这种方法提供了一种可持续的方法,用于利用固体废物 (SAA) 和经过处理的污水污泥.
- 该过程促进了干燥的SS在建筑材料中的高价值利用.
相关概念视频
Bricks
89
Bricks, a fundamental building material, are crafted from fired clay and exhibit a range of shapes, sizes, and colors. The production process starts with extracting local clay or shale, which is then crushed, ground, and screened for a fine texture. The refined material is blended with water, creating a pliable mixture that can be formed into bricks using one of three processes: soft mud, dry press, or stiff mud methods.
Soft mud bricks are shaped in molds with high moisture content and can be...
Soft mud bricks are shaped in molds with high moisture content and can be...
89
Pozzolans
104
Pozzolans are siliceous or aluminous materials blended with Portland cement. They interact with the calcium hydroxide produced during the hydration of Portland cement and contribute to improved strength and durability of concrete. The pozzolanic activity, a measure of a pozzolan's effectiveness, is typically assessed using the strength activity index, as defined in ASTM C 618-93, which calculates the ratio of the compressive strength of cement mixtures with and without pozzolan.
Fly ash is...
Fly ash is...
104
Brick Durability, Strength, and Appearance
168
Brick durability, strength, and appearance are crucial factors in construction, influencing the choice of bricks for specific applications. The process of freeze-thaw, for instance, significantly affects brick durability. This phenomenon occurs when water absorbed by a brick expands as it freezes, potentially causing damage when it melts and refreezes. Bricks are graded for durability: SW-grade bricks are the most durable, offering high strength and low water absorption, followed by MW-grade...
168
Strength and Heat of Hydration
220
The hydration of cement is an exothermic reaction in which heat is generated as cement hydrates. This heat of hydration is critical to cement's strength development. The rate at which this heat is generated affects the temperature rise, with a majority of the heat being released early in the hydration process, half within the first three days, and about 75% within the first week.
The heat of hydration for each cement compound is significant; for instance, tricalcium aluminate (C3A) and...
The heat of hydration for each cement compound is significant; for instance, tricalcium aluminate (C3A) and...
220
Sample Preparation for Analysis: Advanced Techniques
306
Accurate analysis of complex samples often requires advanced preparation techniques to achieve reliable and reproducible results. Samples containing inorganic or organic materials can be challenging to dissolve or decompose effectively. Standard sample preparation methods include acid digestion, fusion, dry ashing, and wet digestion.
Acid digestion with strong acids is commonly used to dissolve inorganic materials that are insoluble (do not dissolve) in water. This method can be useful for...
Acid digestion with strong acids is commonly used to dissolve inorganic materials that are insoluble (do not dissolve) in water. This method can be useful for...
306
Deleterious Substances in Aggregate
156
Deleterious substances in aggregates can be detrimental to the quality and durability of concrete. These substances include organic impurities like loam, which interfere with cement hydration and are usually present in the sand. These prevent a good bond between aggregate and cement paste. Organic impurities can be detected using the colorimetric test, where the darkness of a solution after agitation indicates the level of organic content.
Another type of impurity is clay and fine material that...
Another type of impurity is clay and fine material that...
156


