Sludge drying agent and preparation method and using method thereof

Abstract

The invention relates to a sludge drying agent and a preparation method and a using method thereof. The sludge drying agent is applied to sludge produced in a sewage treating process and can recycle the treated sludge. The sludge drying agent mainly comprises the following components in part by weight: 85 to 93 parts of plant ash, 3 to 8 parts of potassium humate, 2 to 4 parts of heavy magnesium oxide and 1 to 3 parts of silicon dioxide. The sludge drying agent has the characteristics of water permeability, air permeability and very high water-retaining property, and can change sludge with very high water content (generally over 85 percent) into sludge with the water content of less than 45 percent in about 15 days so as to form a firmly-condensed and solidified soil structure.

Description

technical field [0001] The invention relates to a sludge drying agent, which is prepared from various natural minerals and is used for treating sludge generated in the process of sewage treatment and realizing reuse of the treated sludge. Background technique [0002] With the gradual increase of sewage treatment plants in my country and the development of sewage treatment technology, the sludge generated in the process of sewage treatment is also gradually increasing. At present, many sewage plants still transport the sludge at will, and simply landfill or pile it up. These wastes have high organic content and moisture content, are easy to rot and smell, and cause damage to the environment. There are generally two existing methods for sludge treatment: one is composting, and the existing problems are: firstly, a large amount of harmful gas is released, causing surrounding environmental pollution; secondly, the dehydration cycle is long, and it usually takes about 45 days to...

AI Technical Summary

Problems solved by technology

At present, many sewage plants still transport the sludge at will, and simply landfill or pile it up. These wastes have high organic content and moisture content, and are easy to rot and smell, causing damage to the environment.

There are generally two existing methods for sludge treatment: one is composting, and the existing problems are: firstly, a large amount of harmful gas is released, causing surrounding environmental pollution; secondly, the dehydration cycle is long, and it usually takes about 45 days to reduce the water content to below 40%. ; Once again, the problem of frozen soil in winter cannot be solved; the last and most important thing is that the problem of heavy metal content exceeding the standard cannot be solved so far

The other is incineration. There are problems: first, the cost is high; second, the residue may cause secondary pollution to the environment

Most of the existing desiccants use cement or lime as the main raw material, which directly destroys the organic nutrients in the sludge, resulting in narrow application fields of the treated sludge.