Alkali adding catalytic thermal hydrolysis treatment method for sludge

Abstract

The invention provides an alkali adding catalytic thermal hydrolysis treatment method for sludge. The method comprises the following steps of: A, injecting the sludge and an alkali substance into a reaction kettle, and controlling the pH value of the sludge in the reaction kettle to be 10-14; and B, injecting saturated steam of 0.5 to 1.6MPa into the reaction kettle, and reacting for 15 to 60 minutes to obtain hydrolyzed sludge. The method has the advantages that the hydrolysis efficiency of the sludge is improved by adopting a method of adding the alkali substance into the sludge, and quick crushing of sludge cells and quick hydrolysis of organic substances are facilitated in an alkali environment and under a heating condition. Because the hydrolysis efficiency of the sludge is improved by adding the alkali substance into the sludge, the saturated steam of 0.5 to 1.6MPa can be injected into the reaction kettle; the pressure of the saturated steam declines, so that the design pressure of the reaction kettle declines, and the investment cost is greatly reduced; because the pressure of the saturated steam declines, the investment for matched equipment such as a boiler is greatly reduced; and the consumption of the steam declines, so that the energy consumption is reduced, and the operating cost for treating the sludge is greatly reduces.

Description

technical field

[0001] The invention relates to a sludge treatment method, in particular to a sludge addition alkali-catalyzed thermal hydrolysis treatment method. Background technique

[0002] Now with the development of urbanization, a large amount of municipal sludge is produced every day, which puts great pressure on the environment and sustainable development. To achieve the reduction, harmlessness and resource utilization of sludge, new processes and new technologies must be adopted to solve the problem. . At present, the vast majority of sewage treatment plants use the activated sludge process to treat sewage. The activated sludge metabolized becomes sludge after sewage treatment. Therefore, municipal sludge is composed of a large number of cellular organic matter. These cells are Protected by the cell walls of sugar components such as cellulose and peptidoglycan, the organic matter and bound water in the cells are not easily separated and hydrolyzed, which makes it ...

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