Method for preparation of organic calcium nutrient soil by municipal sludge

A technology of municipal sludge and organic calcium, which is applied in the fields of organic fertilizer, sewage/sludge fertilizer, dehydration/drying/concentrated sludge treatment, etc., to achieve the effect of good nutrient soil quality, low cost and little secondary pollution

Inactive Publication Date: 2018-07-10
山西晋联环境科技有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing organic calcium nutrient soil from municipal sludge, which can solve the technical problems of using waste for resource recovery and soil improvement through transformation

Method used

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  • Method for preparation of organic calcium nutrient soil by municipal sludge
  • Method for preparation of organic calcium nutrient soil by municipal sludge

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Experimental program
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Effect test

Embodiment 1

[0021] Such as figure 1 Shown, a kind of method that municipal sludge prepares organic calcium nutrient soil:

[0022] (1) After the municipal sludge (collected from Shanxi Sewage Treatment Co., Ltd.) is collected, it is prepared together with the hydrolysis agent and preheated to 70°C, and the thermal hydrolysis reaction is carried out at a temperature of 123°C, and the temperature is kept at 123°C for 3 hours; The hydrolysis agent is quicklime, and the proportion of quicklime added is 20% of the dry weight of the sludge; after the thermal hydrolysis treatment, the municipal sludge will destroy the microbial cell wall, and release the protein and water in the bacteria gelatin, which is convenient for step (2) pressing and dehydration.

[0023] (2) After thermal hydrolysis treatment, the treated municipal sludge directly enters the plate-and-frame filter press without adding any conditioning agents, and is squeezed through the plate-and-frame filter press to obtain a moisture ...

Embodiment 2

[0030] The difference between the method of Example 2 and the method of Example 1 is that the addition ratio of quicklime is 22.5% of the dry weight of the sludge, the deployment preheating temperature is 90°C, the thermal hydrolysis reaction temperature is 120°C, and a constant temperature of 120°C is maintained for 2 Hour.

[0031] In step (3), the moisture content of the dried sludge is 38.2%, the pH value is 9.8, the calcium content is 11.3%, the organic matter content is 32.5%, the crude protein content is 10.3%, and the total nutrient content is 7.73%, which meet the standard requirements.

Embodiment 3

[0033] The difference between the method of Example 3 and the method of Example 1 is that the addition ratio of quicklime is 18% of the dry weight of the sludge, the deployment preheating temperature is 80°C, the thermal hydrolysis reaction temperature is 125°C, and the constant temperature of 125°C is kept at 2.5°C. Hour.

[0034] In step (3), the moisture content of the dried sludge is 39.0%, the pH value is 8.6, the calcium content is 9.4%, the organic matter content is 30.9%, the crude protein content is 9.8%, and the total nutrient content is 7.52%, which meet the standard requirements.

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Abstract

The invention aims to provide a method for preparation of organic calcium nutrient soil by municipal sludge, and can solve the technical problems that waste is subjected to resource recovery and is transformed to improve soil. The method includes the following steps: (1) after the municipal sludge is collected, adding a hydrolysis reagent, and carrying out thermal hydrolysis treatment, wherein thehydrolysis reagent is quick lime, and the addition ratio of the quick lime is 18%-22.5% of the sludge dry weight; (2) carrying out press filtration of the municipal sludge after thermal hydrolysis treatment by a plate and frame filter press, and then carrying out drying treatment, to obtain dried sludge; (3) analyzing nutritional components and properties of the dried sludge; (4) crushing and sieving the dried sludge by crushing and sieving processes; and (5) adding corresponding nutrient components to the dried sludge after crushing and sieving according to the use demand, and mixing and stirring to prepare the finished product of organic calcium nutrient soil.

Description

technical field [0001] The invention relates to the field of solid waste reuse and resource utilization, in particular to a method for preparing organic calcium nutrient soil from municipal sludge. Background technique [0002] Soil salinization, heavy metal pollution, and lack of nutrients are becoming more and more serious. Generally, the climate is dry and the groundwater level is high. The groundwater in this area contains a certain amount of salt. Due to the capillary action, the water evaporates after rising to the surface and the salt remains. Over time, the salt content of the soil gradually increases, forming a saline-alkali soil. Soil heavy metal pollution cannot be degraded by microorganisms, and can be bio-accumulated through the food chain and produce biomagnification; it will continue to migrate, and it is easy to change its form and amplify its toxicity. At present, the lack of soil nutrients is also particularly serious, and soil compaction and acidification...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05F7/00C05G3/00C02F11/14
CPCC02F11/14C05D3/02C05F7/00C05G3/00Y02A40/20
Inventor 李雄伟朱葛范明阳
Owner 山西晋联环境科技有限公司
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