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Sludge curing agent, soil water retention and fertility increasing agent, and preparation method and use method of soil water retention and fertility increasing agent

A sludge curing agent and fertilizer technology, which is applied in chemical instruments and methods, water/sludge/sewage treatment, sludge treatment, etc., can solve the problem of unsatisfactory effect of soil water retention and fertilizer, cumbersome preparation of curing agent, etc. problems, to achieve the effect of low cost, high heat of hydration, and strong environmental adaptability

Inactive Publication Date: 2020-03-06
UNIV OF JINAN +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, this technology has disadvantages such as cumbersome preparation of curing agent and unsatisfactory effect of soil water retention and fertilizer.

Method used

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  • Sludge curing agent, soil water retention and fertility increasing agent, and preparation method and use method of soil water retention and fertility increasing agent
  • Sludge curing agent, soil water retention and fertility increasing agent, and preparation method and use method of soil water retention and fertility increasing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] For the above deficiencies, the present embodiment provides a sludge curing agent, which includes phosphate, light-burned magnesia, fly ash and polyacrylamide, in the sludge curing agent, the mass of fly ash The proportion is 5-35%, the mass proportion of polyacrylamide is 0.2-2%, the total mass proportion of light-burned magnesia and phosphate is 64%-94%, and the mass proportion of light-burned magnesia and phosphate The mass ratio is 4:1~5:1.

[0026] In this embodiment, the light-burned magnesia can be commercially purchased light-burned activated magnesia. For example, in a preferred embodiment of this embodiment, the light-burned magnesia is light-burned magnesia with an activity above 68, wherein the magnesia The content is 95.49%, the particle size is 100 mesh to 200 mesh, purchased from the market.

[0027] The phosphate in the above curing agent is an industrial grade phosphate, such as ammonium dihydrogen phosphate, potassium dihydrogen phosphate, diammonium ...

Embodiment 2

[0032] The present embodiment provides a kind of preparation method of soil water-retaining and fertilizing agent, such as figure 2 As shown, the method includes the following steps:

[0033] Stirring and mixing: Weigh the sludge and the sludge solidifying agent according to the weight ratio, and stir and mix the sludge and the sludge solidifying agent. The sludge solidifying agent is the sludge solidifying agent provided in the first embodiment above. agent;

[0034] Forming and curing: molding the stirred and mixed sludge and the sludge treatment agent in a cement slurry mold, and demoulding for curing to obtain a solidified body;

[0035] Grinding and granulating, and pulverizing the cured solidified body to obtain the soil water-retaining fertilizer.

[0036] In this embodiment, 2000g of sludge from a sewage treatment plant is weighed, the water content of the sludge is 94-95%, and then 400g of sludge solidifying agent is weighed at 20% of the weight of the sludge. In t...

Embodiment 3

[0045] This embodiment also provides a method for preparing a soil water-retaining and fertilizing agent. The same thing as Example 2 is that this embodiment also selects sludge from a sewage treatment plant with a moisture content of 94-95% to prepare a soil water-retaining and fertilizing agent. ,The difference is:

[0046] Take by weighing above-mentioned sludge 2000g, take by weighing 600g sludge solidifying agent with 30% of sludge weight, the mass percent of each component in this sludge solidifying agent is magnesium oxide: 47.4%; Potassium dihydrogen phosphate: 37.6%; Coal ash: 15%, the ratio of the mass of polyacrylamide to the sum of the mass of magnesium oxide, potassium dihydrogen phosphate and fly ash is 5:1000.

[0047] Add the weighed sludge solidifying agent into the sludge and stir for 2 minutes, then mold the mixture in a clean slurry mold, and after demoulding, maintain it in the air for 3 to 7 days to obtain a sludge solidified body. The compressive streng...

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Abstract

The invention provides a sludge curing agent, a soil water retention and fertility increasing agent, and a preparation method and a use method of the soil water retention and fertility increasing agent. The sludge curing agent comprises phosphate, light calcined magnesia, fly ash and polyacrylamide, wherein in the sludge curing agent, the mass ratio of the fly ash is 5-35%, the mass ratio of the polyacrylamide is 0.2-2%, the total mass ratio of the light calcined magnesia and the phosphate is 64-94%, and the mass ratio of the light calcined magnesia to the phosphate is 4:1-5:1. Components of the sludge curing agent are industrial-grade raw materials and are easy to obtain, and the cost is low. The sludge curing agent is added into sludge, and the soil water retention and fertility increasing agent is obtained through stirring, mixing, forming, curing, crushing and granulating. The sludge curing agent reacts with water in the sludge to form a porous framework, so that the transportationrequirement is met; the cured product magnesium potassium phosphate contains K, P and Mg three nutrient elements necessary for the growth of plants, and polyacrylamide and the porous framework structure act together, so that a water retention effect is achieved, and the purpose of recycling the high-water-content sludge is achieved.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to the technical field of solidification and utilization of sludge, and more specifically to a sludge solidifying agent, a soil water-retaining and fertilizer-increasing agent, a preparation method and a use method thereof. Background technique [0002] The rapid development of urbanization and the improvement of environmental requirements, the main problems brought about include the treatment of a large amount of sludge, as long as the sources of these sludge are: first, the sludge generated in the process of urban sewage treatment; second, the water bodies in and around the city Due to environmental protection and dredging of the river itself, the river deposits sludge; the third is a large amount of sludge generated during the urban construction process, such as viaduct pier foundations. These sludges are large in size, complex in composition and high in water co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C05G3/80C05G3/70
CPCC02F11/008C05B7/00
Inventor 王琦宋鹏陈延昌张京波刘裕刘明乐
Owner UNIV OF JINAN
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