关键词: 疏浚底泥, 赤泥, 粉煤灰, 磷

Abstract: Dredged sediment is one of the important measures to solve the problem of eutrophication. How to effectively treat dredged sediment has become a difficult issue to be solved in the present. Land utilization is one of the ways to effectively absorb dredged sediment, which however will cause soil nutrients loss, especially phosphorus loss. Taking red mud and fly ash as raw materials and using them for phosphorus stabilization, this paper studied the character of dredged sediment, effect of mixing solid stabilizer on pH of dredged sediment, and effect of stabilization time and dosage of solid stabilizer on phosphorus leaching. The results showed that the pH of dredged sediment increased with the stabilizer dosage increasing. The phosphorus leaching decreased with the stabilization time increasing. The phosphorus leaching increased with the increasing of red mud dosage. While, the phosphorus leaching decreased with the increasing dosage of fly ash and mixture of red mud and fly ash. Therefore, the balanced mixture of fly ash and red mud and fly ash can effectively stabilize phosphorus in dredged sediment.

Key words: dredged sediment, red mud, fly ash, phosphorus