Abstract：
Limited open areas for urban agriculture and greenery have led to the search for innovative, sustainable growing media to strengthen the food supply and improve atmospheric quality for a resilient city. Rampant land developments have caused soil to become increasingly scarce. Sewage sludge incineration ash (SSIA), the by-product of waste-to-energy (WtE) incineration of sewage sludge, is a major municipal waste containing phosphorus-fertilizing nutrients. For the first time, we investigated the novel application of SSIA as a soilless plant-growing medium with built-in fertilizer. SSIA outperformed topsoil in bulk density, water-holding capacity, porosity, and nutrient content. However, it was found that SSIA has a high salinity and should be treated first. Wheatgrass (Triticum aestivum L.), a fast-growing glycophyte, thrived in the desalinated SSIA, showing growth and nutrient content comparable to the topsoil case. Simultaneously, it demonstrated phytoremediation. The SSIA residue was then recycled into cementitious materials, using desalinating water for mixing. SSIA upcycle into a growing medium facilitates urban resource management by utilizing nutrients in sewage waste for eco-friendly plant cultivation, benefiting urban agriculture and greenery. It is also a prudent valorization step before further recycling SSIA to reduce landfill requirements.
摘要：
城市农业和绿化的开放区域有限，导致人们寻求创新，可持续发展的媒体，以加强粮食供应和改善大气质量，打造一个有弹性的城市。猖獗的土地开发导致土壤变得越来越稀缺。污水污泥焚烧灰（SSIA），废物转化能源(WtE)焚烧污水污泥的副产品，是一种含有磷肥养分的主要城市垃圾。第一次,我们研究了SSIA作为内置肥料的无土植物生长介质的新应用。SSIA的容重优于表土，保水能力，孔隙度,和营养成分。然而,发现SSIA具有高盐度，应先治疗。麦草（TriticumaestivumL.），一种快速生长的糖，在海水淡化的SSIA中蓬勃发展，显示与表土情况相当的生长和养分含量。同时,它证明了植物修复。然后将SSIA残留物回收到胶结材料中，使用淡化水混合。SSIA向上循环到生长介质中，通过利用污水废物中的养分进行生态友好型植物种植，促进了城市资源管理。有利于城市农业和绿化。在进一步回收SSIA以减少垃圾填埋场要求之前，这也是谨慎的增值步骤。
