Method for preparing mineral organic fertilizer by using surplus sludge in municipal sewage plants

A technology for excess sludge and urban sewage, which is applied in the preparation of organic fertilizers, organic fertilizers, and bio-organic part treatment, etc., can solve the problems of increasing the cost of fertilizer production, the existence of toxic and harmful substances, and the long fermentation reaction time, so as to avoid stench. Problems, high added value, the effect of reducing the amount of flocculant added

Inactive Publication Date: 2014-04-30
安徽乐农环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods generally have disadvantages such as heavy metal residues, toxic and harmful substances, long fermentation reaction time, difficulty in collecting raw materials, and lack of nutrients.
Patents for preparing fertilizers using attapulgite clay as raw materials include the attapulgite molding method (200810086721.3), and natural mineral fertilizers (201010554887.0), which are mainly fermented by using attapulgite clay, chicken manure and bacteria, but a large amount of chicken manure Collecting will bring a lot of trouble and will increase the cost of making fertilizer

Method used

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  • Method for preparing mineral organic fertilizer by using surplus sludge in municipal sewage plants
  • Method for preparing mineral organic fertilizer by using surplus sludge in municipal sewage plants

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Experimental program
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Effect test

Embodiment 1

[0034] Such as figure 1 As shown, it is a process flow of the method for preparing mineral organic fertilizer by utilizing the surplus sludge of urban sewage plant, and the concrete steps are as follows:

[0035] (1) Place the ozone catalytic oxidation equipment outside the sludge concentration tank, and achieve sludge reduction through the sludge in and out of the equipment. The oxidation time is 120 minutes, so that the ozone dosage in the sludge reaches 0.07gO 3 / gSS, so as to achieve a 50% reduction in sludge and eliminate some heavy metals;

[0036] (2) Add flocculant polyacrylamide to the sludge obtained in step (1) for pressure filtration and dehydration, so that the moisture content of the sludge can reach 50%;

[0037] (3) The sludge obtained by pressure filtration and dehydration in step (2) is added to the subcritical water reaction kettle, and the subcritical water reaction step is carried out, and sodium hydroxide is added to the subcritical water reaction kettle...

Embodiment 2

[0041] A method for preparing mineral organic fertilizers by utilizing the surplus sludge of urban sewage plant, the specific steps are as follows: (1) the ozone catalytic oxidation equipment is placed outside the sludge thickening tank, the oxidation time is 100 minutes, and the ozone dosage in the sludge is 100 minutes. up to 0.05gO 3 / gSS, so as to realize the reduction of sludge and the elimination of some heavy metals;

[0042] (2) Add flocculant polyacrylamide to the sludge obtained in step (1) for pressure filtration and dehydration, so that the moisture content of the sludge can reach 60%;

[0043] (3) The sludge obtained by pressure filtration and dehydration in step (2) is added to the subcritical water reaction kettle, and the subcritical water reaction step is carried out, and sodium hydroxide is added to the subcritical water reaction kettle to adjust the sludge concentration. The pH is 8.5, and steam is introduced, the temperature is adjusted to 250°C, the press...

Embodiment 3

[0047] A kind of method that utilizes the surplus sludge of municipal sewage plant to prepare mineral organic fertilizer, concrete steps are as follows: (1) ozone catalytic oxidation equipment is placed on the outside of sludge thickening tank, oxidation time is 150 minutes, makes the amount of ozone in sludge up to 0.05gO 3 / gSS, so as to realize the reduction of sludge and the elimination of some heavy metals;

[0048] (2) Add flocculant polyacrylamide to the sludge obtained in step (1) for pressure filtration and dehydration, so that the moisture content of the sludge can reach 40%;

[0049] (3) The sludge obtained by pressure filtration and dehydration in step (2) is added to the subcritical water reaction kettle, and the subcritical water reaction step is carried out, and sodium hydroxide is added to the subcritical water reaction kettle to adjust the sludge concentration. The pH is 7.5, and steam is introduced, the temperature is adjusted to 100°C, the pressure is 4.0MP...

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Abstract

The invention discloses a method for preparing mineral organic fertilizer by using surplus sludge in municipal sewage plants. The method mainly comprises the following three steps: firstly reducing sludge in a sludge thickening tank, dehydrating the reduced sludge by adopting a catalytic ozonation method, carrying out subcritical water reaction on the dehydrated sludge, and discharging solids subjected to harmless treatment; finally mixing modified attapulgite clay with the sludge subjected to harmless treatment, chicken manure and microorganism beneficial microbial agents, and fermenting the mixture to obtain the mineral ecological organic fertilizer. The method is green and environment-friendly and realizes the harmless and resourceful treatment of the sludge; the obtained mineral organic fertilizer is capable of obviously improving the structure of soil, enabling the volume-weight of soil to be reduced, the holes of soil to be increased and the ventilation and water permeability of the soil to become good and adjusting the uniform growth of crops and has a good controlled release effect, thus the quality of the crops is improved.

Description

technical field [0001] The invention belongs to the technical field of sludge treatment and agricultural fertilizers, and in particular relates to a method for preparing mineral organic fertilizers from urban sewage plant sludge. Background technique [0002] With the rapid development of my country's urbanization process, the number and scale of urban sewage treatment plants have increased rapidly. Since most sewage treatment plants use the most common activated sludge method, they generally produce 0.3% to 0.5% of the volume of sewage or about 1% to 2% of the residual sludge of the quality of sewage. At present, my country produces about 30 million tons of surplus sludge every year. After the "Twelfth Five-Year Plan", the surplus sludge will double year by year. [0003] The residual sludge of urban sewage treatment plants contains complex components, rich in nutrient-rich substances (organic nutrients, potassium, nitrogen and phosphorus, etc.), domestic sewage, and indust...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05F15/00C05F17/00C05G5/00
CPCY02W30/40
Inventor 傅剑锋李庆国曾海鳌
Owner 安徽乐农环保科技有限公司
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