Sewage sludge is considered as a main product obtained from urban liquid effluents that are discharged into sanitation systems of wastewater treatment plants. The aim of this work was to reuse it as compost, after the dehydration process, to replace the amendment applied in agriculture and also to reduce the environmental pollution caused by solid wastes. To justify our biotechnological approach, nutrient characterization of the composted dewatered sewage sludge was carried out and compared to cattle manure. The contents of N, P, K, and the organic matter are 3.67, 5.64, 6.60 g·kg^-1 dry matter (DM), and 70%, respectively, in compost and 3.1, 1.6, 3.0 g·kg⁻¹ DM, and 55%, respectively, in manure. Fertilization tests with composted dewatered sewage sludge and cattle manure were performed on Pelargonium inquinans. Monitoring the length of the first internodes showed an improvement of 4.2 mm in the length in compost plants with a development of 22.8 buds and 8.2 flower buds (19.4 buds and 4.4 flower buds developed in manure plants). It appears that the intake of composted dewatered sewage sludge ensures better growth for the studied plant due to its richness in nutrients, which confirms the beneficial effect of composting sewage sludge on plant cultivation.

污水污泥被认为是从城市污水中获得的主要产物，这些污水被排放到废水处理厂的卫生系统中。这项工作的目的是在脱水过程之后将其用作堆肥，以替代农业中使用的修正案，并减少由固体废物造成的环境污染。为了证明我们的生物技术方法的合理性，对堆肥脱水污水污泥进行了营养表征，并与牛粪进行了比较。堆肥中N，P，K和有机物的含量分别为3.67、5.64、6.60 g·kg ^-1干物质（DM）和70％，以及3.1、1.6、3.0 g·kg ^-1DM和55％的肥料。在天竺葵中进行了堆肥脱水污水污泥和牛粪的施肥试验。监测第一个节间的长度显示堆肥植物的长度增加了4.2毫米，发育了22.8个芽和8.2个花芽（粪肥植物发育了19.4个芽和4.4个花芽）。看来，由于堆肥脱水的污水污泥营养丰富，因此摄取的堆肥可以确保研究植物的更好生长，这证实了堆肥污水污泥对植物栽培的有益作用。