School of Minerals Processing & Bioengineering, Central South University, Changsha, 410083, PR China.
School of Minerals Processing & Bioengineering, Central South University, Changsha, 410083, PR China.
J Environ Manage. 2023 Apr 15;332:117403. doi: 10.1016/j.jenvman.2023.117403. Epub 2023 Feb 2.
The complexity of municipal sludge dewatering is a bottleneck problem limiting resource utilization. In this paper, adding municipal solid waste incineration fly ash (MSWI FA) to municipal sludge for enhanced dewatering was applied, while the chlorine salt in MSWI FA was simultaneously removed using water in municipal sludge. The effects of different dosages and chemical components of MSWI FA on municipal sludge dewatering, and the removal effect of municipal sludge washing on Cl element were investigated. The results showed that the municipal sludge's specific resistance to filtration after co-treatment was significantly reduced, and more hydrophobic channels were formed in the vacuum suction filtration of the treated municipal sludge, conducive to efficient water removal. The moisture content of municipal sludge was reduced from 96.0% to 48.3%, and the moisture reduction rate increased from 17.7% to 32.1%. The chemical composition of MSWI FA could effectively promote the dewatering of municipal sludge, among which CaO was the best, followed by CaCl and NaCl, and KCl was the worst. Simultaneously, the municipal sludge showed a good effect on removing Cl from MSWI FA. The minimum Cl content in the mixture after Co-treatment is 1.5%. These results could provide a new way to dispose of MSWI FA and municipal sludge.
城市污泥脱水的复杂性是限制资源利用的瓶颈问题。本文将城市垃圾焚烧飞灰（MSWI FA）添加到城市污泥中以增强脱水，同时利用城市污泥中的水去除 MSWI FA 中的氯盐。考察了不同剂量和化学成分的 MSWI FA 对城市污泥脱水的影响，以及城市污泥洗涤对 Cl 元素的去除效果。结果表明，共处理后城市污泥的比阻过滤显著降低，处理后的城市污泥在真空抽吸过滤中形成了更多的疏水通道，有利于高效脱水。城市污泥的含水率从 96.0%降低到 48.3%，减水率从 17.7%提高到 32.1%。MSWI FA 的化学成分能有效促进城市污泥的脱水，其中以 CaO 效果最好，其次是 CaCl 和 NaCl，KCl 效果最差。同时，城市污泥对 MSWI FA 中 Cl 的去除效果较好。共处理后混合物中 Cl 的最低含量为 1.5%。这些结果为处理 MSWI FA 和城市污泥提供了一种新的途径。
