Immobilizing agent for waste sludge from sewage treatment plant and its preparation and application

Abstract

The invention discloses an immobilizing agent for waste sludge of a sewage treatment plant, its preparation and application, and belongs to sludge treatment of sewage treatment plants in environmental protection. The invention is to mix the heat-treated calcium-rich clay with high-efficiency heavy metal fixation capacity and waterworks tailings evenly in a certain proportion under certain temperature and pH ranges, and place them under natural environmental conditions for 8‑10 days , natural weathering to dry. Afterwards, it is mixed with the waste sludge of the sewage treatment plant in a certain proportion, and is used for the adsorption of substances harmful to the environment in the sludge of the sewage treatment plant. The present invention has a strong adsorption effect on heavy metal ions, nutrient salts and other substances, which is beneficial to promote the immobilization of sewage plant sludge; adding water plant sludge can reduce the consumption of attapulgite clay, reduce the cost of immobilization, and achieve The purpose of treating waste. The sludge treated with the immobilizing agent is used in the construction and maintenance of ecological wetlands to realize its cyclic transformation in nature, which has a strong guiding role in the development of sludge treatment and disposal technology in sewage plants.

Description

technical field

[0001] The invention belongs to the technical field of sludge treatment in sewage treatment plants in environmental protection, more specifically, it is a method for immobilizing sludge in sewage treatment plants by mixing heat-treated calcium-rich clay materials and tailings from waterworks to prepare immobilizing agents . Background technique

[0002] As a by-product of urban sewage treatment, municipal domestic sludge has unique properties, such as high water content, high organic matter content, and also contains a large number of toxic and harmful substances such as pathogens and heavy metals. The properties of sludge from urban sewage treatment plants are complex and very unstable. They are extremely easy to corrode and emit a pungent smell. If they are piled up directly, they will become a living place for pathogenic microorganisms and other harmful bacteria, causing secondary pollution to the environment. Therefore, the treatment and disposal of urba...