College of Environment, Hohai University, Nanjing 210098, China.
Ministry of Education, Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Hohai University, Nanjing 210098, China.
Int J Environ Res Public Health. 2019 Jul 24;16(15):2637. doi: 10.3390/ijerph16152637.
The recycling of waterworks sludge has become a trending issue because it not only solves the problem of difficult disposal but also saves land resources. This paper aimed to provide a new idea for the utilization of waterworks sludge to form ceramsite and to purify sewage. The specific surface area, average pore size, and pore volume of the made ceramsite were 8.15 m/g, 8.53 nm, and 1.88 cm/g, respectively. The made ceramsite was applied in a vertical-flow constructed wetland, and the removal efficiency of nitrogen, phosphorus and organic matter in sewage were investigated under the conditions of different start-up periods, hydraulic retention times, matrix filling heights and water quality. The removal rates of chemical oxygen demand (COD), ammonia nitrogen (NH-N), and total phosphorus (TP) in the constructed wetlands were stable at 70%, 60%, and 79%, respectively. This constructed wetland with a ceramic matrix has certain advantages in the total amount of denitrifying microorganisms, with a proportion of 14.92%. The results prove the feasibility of preparing ceramsite from waterworks sludge and applying it as a matrix in a constructed wetland to purify sewage.
自来水厂污泥的循环利用已成为一个热门话题，因为它不仅解决了难以处理的问题，而且还节省了土地资源。本文旨在为自来水厂污泥形成陶粒并净化污水提供新思路。所制陶粒的比表面积、平均孔径和孔体积分别为 8.15m/g、8.53nm 和 1.88cm/g。将所制陶粒应用于垂直流人工湿地中，考察了不同启动期、水力停留时间、基质填充高度和水质条件下污水中氮、磷和有机物的去除效率。人工湿地对化学需氧量（COD）、氨氮（NH-N）和总磷（TP）的去除率分别稳定在 70%、60%和 79%。以陶瓷基质为基质的人工湿地在反硝化微生物总量方面具有一定优势，占比为 14.92%。结果证明了从自来水厂污泥中制备陶粒并将其用作人工湿地基质来净化污水的可行性。
