Sludge building material and preparation method thereof

Abstract

The invention provides a sludge building material and a method for preparing the same, which particularly relates to a fresh sludge building material and a method for preparing the same. The building material consists of sludge, shale and fly ash. In the method, a gravity thickening pond of the prior municipal sewage plant is utilized, the prior gravity thickening process is adopted, the shale and the fly ash are added in the fresh sludge in the pond, and the discharged enriched mixture are directly used as the building material or the discharged enriched mixture is further dewatered to obtain the finished product. The building material has the advantages of few components and large sludge consumption. The method has the advantages of simple method, mature technique and low cost, and provides a new approach for the treatment and the utilization of sludge resources and solves the problems of large land occupation, difficult investment and environmental pollution in the municipal sewage plant. The technical proposal of the invention can be wide applied to the municipal sewage plant adopting the continuous current gravity thickening process. The product prepared by the technical proposal of the invention can be widely applied to the preparation of building bricks, porcelain granules and the like.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a building material using raw sludge and a preparation method thereof. Background technique [0002] With the rapid development of urban construction in our country, the construction of urban sewage treatment is also developing rapidly. The water content of the raw sludge produced by the sewage treatment plant in the process of sewage treatment is generally about 99%. Such as parasite eggs, pathogenic microorganisms, bacteria, synthetic organic matter and heavy metal ions, etc., therefore, need to be handled and disposed of in a timely and proper manner. The water content of the thickened sludge obtained after the raw sludge is concentrated is reduced to 95-97%, which is almost pasty and maintains a fluid state. The water content of the dewatered sludge obtained by dewatering the concentrated sludge can be reduced to 75-85%, and it turns into a flocculate...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a kind of sludge building material and its preparation method aiming at the deficiencies of the existing raw sludge gravity concentration method and sludge resource utilization method, which have the advantages of simple material components, large sludge utilization, It can use the gravity concentration tank commonly used in existing urban sewage treatment plants, and adopt the existing gravity concentration process to carry out gravity concentration of raw sludge, and can make full use of the water contained in the sludge, with low production cost, low energy consumption, and excellent process Simple and other features