Wang Hanxi, Xu Jianling, Liu Yunqing, Sheng Lianxi
State Environmental Protection Key Laboratory of Wetland Ecology and Vegetation Restoration / School of Environment, Northeast Normal University, Jingyue Street 2555, Changchun, 130117, Jilin, China.
Key Laboratory of Pollutant Chemistry and Environmental Treatment, College of Chemistry ＆; Environmental Sciences, Yili Normal University, Jiefang West Road 448, Yining, 835000, Xinjiang, China.
J Environ Manage. 2021 Jun 1;287:112374. doi: 10.1016/j.jenvman.2021.112374. Epub 2021 Mar 22.
Municipal sludge is a solid waste material, and resource utilization is the optimal way to dispose of this material. The amount of municipal sludge produced in China is large, and it can be used in the preparation of ceramsite. The content of AlO in drinking water treatment sludge is significantly higher than that in wastewater treatment sludge, while the content of KO, NaO and MgO in the two kinds of sludge is similar. When sludge is used to prepare ceramsite, the amount of sludge in most raw materials for ceramsite is less than 50%. The bulk density of the prepared sludge ceramsite is less than 1000 kg m, and the highest water absorption rate is close to 40%. The leaching content of heavy metals in municipal sludge-based ceramsite is within the standard health safety limit, and heavy metals are better stabilized. The fitting effect of the pseudo-second-order kinetic equation of the dynamic adsorption of sludge ceramsite is obviously better than that of the pseudo-first-order kinetic equation. Sludge ceramsite used in bio-filter media and constructed wetland (CW) substrates is good able to purify wastewater. In the future, the preparation method of municipal sludge ceramsite and purification research of CW substrates based on sludge ceramsite need to be further improved.
城市污泥是一种固体废弃物，资源利用是处置该物料的最佳方式。中国城市污泥产量巨大，可用于制备陶粒。饮用水处理污泥中AlO的含量显著高于污水处理污泥，而两种污泥中KO、NaO和MgO的含量相近。当污泥用于制备陶粒时，大多数陶粒原料中污泥的用量低于50%。制备的污泥陶粒堆积密度小于1000 kg/m，最高吸水率接近40%。城市污泥基陶粒中重金属的浸出含量在标准健康安全限值内，重金属得到较好稳定。污泥陶粒动态吸附的准二级动力学方程拟合效果明显优于准一级动力学方程。用于生物滤料和人工湿地（CW）基质的污泥陶粒具有良好的废水净化能力。未来，城市污泥陶粒的制备方法以及基于污泥陶粒的CW基质净化研究有待进一步完善。
