使用不同调节剂的组合来促进消化的污泥的脱水:风湿学特征
Xiuqin Cao1, Fei Wang1, Ji Yang1
1School of Environment and Energy Engineering, Beijing University of Civil Engineering and Architecture, 1#Zhanlanguan Road, Xicheng District, Beijing 100044, China.
Environmental research
|August 24, 2023
概括
使用聚烯胺,聚硫酸和污泥生物炭的结合污泥调节显著改善了脱水,超过35%的固体含量. 风学性质有效地预测了污泥脱水性能.
科学领域:
- 环境工程 环境工程
- 水处理技术水处理技术
- 材料科学 材料科学 材料科学
背景情况:
- 污泥排水对于有效的处置和再利用至关重要.
- 了解调节对污泥整形学的影响对于优化脱水至关重要.
研究的目的:
- 使用聚烯胺 (PAM),聚硫酸 (PAS) 和污泥生物炭 (SAC) 调查消化污泥的脱水性能.
- 用响应表面方法学分析组合的调节效应并优化处理比率.
- 通过风湿学分析阐明脱水改善的潜在机制.
主要方法:
- 系统地研究PAM,PAS和SAC在不同剂量的单个和联合调节效应.
- 应用Box-Behnken多因素实验和响应表面方法 (RSM) 进行优化.
- 使用赫舍尔-布克利模型评估污泥特性的风湿学分析.
主要成果:
- 3‰的聚烯胺 (PAM) 显示出最好的个人调节效应.
- 组合调节处理显著增强了脱水,达到过蛋糕固体含量超过35%.
- 风湿学分析显示了产量压力变化和明显的厚度变化与SAC调节.
结论:
- 与单个处理相比,组合污泥调节提供了优越的脱水性能.
- 诸如产量压力和厚度等风病学指数是评估污泥脱水性能的可靠指标.
- 优化的调节策略可以提高污泥管理效率.
相关概念视频
01:06Coagulation
329
Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
329
01:09Colloidal precipitates
619
The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
619
01:12Precipitation Processes
485
The experimental conditions in a gravimetric analysis should be optimized to maximize the particle size and purity of the obtained precipitate. Ideally, the concentration of the precipitating reagent should be low with effective stirring to maintain low relative supersaturation for the growth of large crystals. In homogeneous precipitation, the precipitant is slowly generated by a chemical reaction in the solution to avoid local reagent excesses. For example, urea decomposes gradually to...
485
04:01Factors Affecting Solubility
33.5K
Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide:
33.5K
01:14Design Example: Managing Concrete Workability
101
This example deals with managing the workability of concrete for a raft foundation project under hot weather conditions. Workability is crucial for ensuring the concrete is easy to place, compact, and finish. In this scenario, a slump test — a common method to measure the workability of fresh concrete — initially indicated low workability. This was attributed to the rapid water loss from the concrete mix, exacerbated by the high temperatures causing the course aggregates to heat up.
101
01:05Centrifugation
2.3K
Centrifugation is a separation technique based on differences in density or size. It is commonly used to separate solids from aqueous interferents. During centrifugation, the sample is placed in centrifugation tubes and spun at high angular velocity, which allows centrifugal force to act differentially on the different densities or masses of the components. After spinning, the supernatant liquid is decanted. Depending on the specific application, either the pellet or the supernatant is retained...
2.3K