污水处理厂污泥稳定化过程中磷的迁移转化及资源化价值

The phosphorus migration, transformation and resource value in the process of sludge stabilization in wastewater treatment plant

污泥的稳定化处理是城镇污水处理的重要组成部分,从污水处理厂回收和利用磷是污泥稳定化处理过程和产物处置所面对的挑战。选取了国内9个典型的污泥稳定化处理工程,分析了污泥稳定化处理过程中磷的迁移转化特征,探讨了污泥稳定化处理过程磷的回收价值和污泥稳定化产物中磷的土地资源化利用价值,结果表明:污泥厌氧消化过程中磷向上清液释放不足是制约消化液磷回收的重要因素,污泥好氧发酵和污泥焚烧产物中的磷主要在固体产物中且磷浓缩使回收潜力增加;污泥稳定化处理产物中的磷主要以非磷灰石态无机磷存在。

Sludge stabilization is an important part of wastewater treatment and the recovery and utilization of phosphorus from wastewater treatment plants is a challenge for sludge stabilization and product disposal. In this paper, nine Chinese typical sludge stabilization treatment projects were selected. The migration and transformation characteristics of phosphorus during the sludge stabilization treatment process were discussed. Furthermore, the recovery value of phosphorus in the sludge stabilization treatment process and the land use value of phosphorus in the sludge stabilization product were discussed. The results showed that the insufficient release of phosphorus to supernatant during anaerobic digestion of sludge is an important factor restricting phosphorus recovery. Phosphorus in sludge aerobic fermentation and sludge incineration products majorly remains in the solid phase, and the concentration of the phosphorus increases the recovery potential. Phosphorus in sludge stabilization product mainly exists in the from of non-apatite inorganic phosphorus.