Method for stabilizing phosphorus and heavy metal in sludge of sewage treatment factory

Abstract

The invention discloses a method for stabilizing phosphorus and heavy metal in sludge of a sewage treatment factory, and relates to the preparation of an activated red mud stabilizer and the method for stabilizing the phosphorus and the heavy metal in the sludge of the sewage treatment factory. The method has the main technical characteristics that: the activated red mud stabilizer is prepared by roasting cheap bauxite residue red mud serving as a raw material at a certain temperature, and is stirred and mixed uniformly with the sludge of the sewage treatment factory, and the phosphorus and the heavy metal in the excess sludge can be effectively stabilized after the mixture is cultured for a certain period of time. The product performance is that: the specific surface area of the prepared red mud stabilizer is 16.48 to 25.78m<2>/g, and the efficiency of stabilizing the phosphorus and the heavy metal is over 70 percent. The method is simple and practicable, high in treatment efficiency and low in treatment cost.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment plant sludge treatment, in particular to a method for stabilizing phosphorus and heavy metals in sewage treatment plant sludge. Background technique [0002] Sewage treatment plant sludge is an inevitable product in the process of sewage treatment. With the increase of population and the development of urbanization, the amount of sludge in sewage treatment plants is increasing year by year. Sewage treatment plant sludge has the characteristics of large output and high content of phosphorus and heavy metals. Phosphorus with high content is easy to lose and cause eutrophication of water body, and heavy metal with high content is easy to accumulate and lose in plants to pollute the surrounding water body. At present, the chemical fixation method is mainly adopted for the treatment of phosphorus and heavy metals in the sludge of sewage treatment plants. Commonly used chemical agents and mat...

AI Technical Summary

Problems solved by technology

Commonly used chemical agents and materials include ferrous sulfate, aluminum chloride, calcium oxide, etc. Since most of the chemical agents and materials are expensive, it is difficult to promote and apply them on a large scale in actual projects. Therefore, high-quality and cheap chemical agents and materials are sought It is the key to solve the problem of phosphorus and heavy metals in sewage treatment plant sludge