Preparation method of an odorless, highly dispersible sludge calcium polypeptide mixture and its application in shale sintered bricks

Abstract

The invention discloses a preparation method of an odorless and high-dispersity sludge and calcium polypeptide mixture as well as an application of the mixture in a shale sintering brick, and belongs to the technical field of treatment and reclamation utilization of sludge. The odorless and high-dispersity sludge and calcium polypeptide mixture is prepared by adding a certain amount of calcium oxide or quicklime and an appropriate amount of water into the sludge of an urban domestic sewage treatment factory, heating to 155-185 DEG C, holding for 0.5-6.5 h and then cooling to the room temperature. According to the method, the sludge is subjected to alkaline conversion at high temperature, no odor is diffused into ambient air in a whole preparation process, and air pollution influencing a living environment of residents around a production factory cannot be caused. The sludge and calcium polypeptide mixture prepared by the method is admixed into a shale grinding raw material in proportion to prepare the sintering brick; in a process of preparing the shale sintering brick, a green brick is odorless in a natural drying process, a heat drying process and a sintering process; the prepared sintering brick is light in weight, smooth and clean; and the performance of the sintering brick such as compression resistance and fracture resistance meets national standards.

Description

technical field [0001] The invention belongs to the technical field of sludge treatment and resource utilization, and in particular relates to the sludge treatment and utilization of urban domestic sewage treatment plants. More specifically, the invention relates to an odorless, highly dispersible sludge calcium polypeptide mixture The preparation method and its application in shale sintered bricks. Background technique [0002] With the development of modern urbanization, the discharge of urban sewage in my country has increased sharply, and the sewage treatment volume and sludge production of sewage treatment plants have also increased day by day. Sludge is a porous medium material with high water content and complex composition. In addition to containing a large amount of water, there are also bacterial micelles formed by various microorganisms and aggregates composed of organic and inorganic substances adsorbed, organic matter, pathogenic microorganisms, Heavy metals, s...

AI Technical Summary

Problems solved by technology

[0006] At present, although the process of preparing sintered bricks from sludge shale seems to be feasible, the reason why it has not been popularized and applied is that there are several serious problems in this process: 1. The production process, the factory area and its surrounding environment have stench, and the production workers and surrounding areas residents can not afford

2. There are technical bottlenecks in the process

Sludge is mainly composed of microorganisms, silt, unknown organic and inorganic substances, and its particles are relatively coarse and poorly dispersed. Because sludge is a colloidal substance, it has the ability to coagulate and aggregate, and is usually in the form of agglomerates or blocks. It is difficult to disperse after stirring. When sludge is added to crushed shale, it is difficult to mix the two evenly, resulting in large holes and rough surfaces in the fired bricks, which will affect the quality of fired bricks.

3. Cost issues

There are many defects in this patent: on the one hand, the preparation of municipal sludge powder is a very energy-consuming process. Although the sludge is dried, the protein contained in it is not removed or transformed and decomposed, and the odorous substances are not destroyed. The process of natural drying and heating drying has stench, which is unbearable for operators; on the other hand, sludge bricks containing a large amount of protein and having stench will produce odorous substances that seriously pollute the air during the sintering process, including ammonia smell, hydrogen sulfide, etc. , skatole, methyl sulfide and other odors seriously affect the living environment of the surrounding residents, making residents uninhabitable

Therefore, based on the limitations of the above factors, the process of directly using sludge and shale to prepare sintered bricks is still not suitable for large-scale industrial application.