School of Civil Engineering, Wuhan University, No. 8 East Lake South Road, Wuhan 430072, China.
Institute for Population and Development Studies, School of Public Policy and Administration, Xi'an Jiaotong University, Shaanxi Province 710049, China.
Sci Total Environ. 2022 Jan 20;805:150288. doi: 10.1016/j.scitotenv.2021.150288. Epub 2021 Sep 11.
Recovery of the nitrogen (N) and phosphorus (P) in wastewater would help to minimize eutrophication and their reuse would lead to a more sustainable society. Sewage sludge and fly ash were used to fabricate ceramsite in the laboratory. After modified with alkali or lanthanum it was shown in benchtop experiments to effectively recover N and P from real wastewater treatment plant effluent. The N&P-adsorbed ceramsite was then applied as an eco-friendly, slow-release fertilizer to promote the germination, growth and blooming of Impatiens commelinoides, realizing the recycling of N and P from wastewater. Emergy analysis shows that such recycling is more sustainable than the current two approaches (i.e., landfill and incineration) for sludge disposal. This work thus demonstrates a sustainable solution combining the reuse of solid waste, effective wastewater purification and recovery of N and P nutrients. Applying the technologies demonstrated would help to minimize the environmental impact of wastewater and solid waste.
从废水中回收氮（N）和磷（P）有助于最大限度地减少富营养化，而它们的再利用将导致更可持续的社会。在实验室中，使用污水污泥和粉煤灰来制造陶粒。经过碱或镧改性，在台式实验中表明，它可以有效地从实际污水处理厂废水中回收 N 和 P。然后，将吸附 N 和 P 的陶粒用作环保、缓释肥料，以促进长春花的发芽、生长和开花，实现废水 N 和 P 的回收。能值分析表明，与目前污泥处理的两种方法（即填埋和焚烧）相比，这种回收方式更具可持续性。因此，这项工作展示了一种将固体废物再利用、有效净化废水和回收 N 和 P 营养物质相结合的可持续解决方案。应用所展示的技术将有助于最大限度地减少废水和固体废物的环境影响。
