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Method for making sludge into nutrient soil through anaerobic fermentation

A technology of sludge anaerobic fermentation and anaerobic fermentation, which is applied in the preparation of sewage/sludge fertilizers, fertilizers made from biological wastes, and organic fertilizers, etc. Reduce power cost, reduce power consumption, reduce harmful effects

Inactive Publication Date: 2016-07-20
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problems of relatively large air pollution and high processing cost in the sludge fermentation treatment in the above-mentioned prior art, the present invention provides a method for preparing nutrient soil by anaerobic fermentation of sludge

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A method for preparing nutrient soil by anaerobic fermentation of sludge, comprising the following steps:

[0024] Step 1: Choose a nutrient-poor and thick soil slope away from residential areas, and this slope is far away from water sources and rivers, and the groundwater level is relatively deep. Excavate an anaerobic fermentation tank with a length, width, and height of 4m, of which 20cm of surface soil Collect separately from the lower layer of soil; if there is sand and gravel in the excavated soil, it needs to be sieved, and the sieved soil and sand and gravel are kept separately;

[0025] Step 2: Lay an anti-seepage film on the bottom of the anaerobic fermentation tank dug in step 1 and the surrounding side walls to prevent the fermentation liquid produced by sludge fermentation from polluting the surrounding soil;

[0026] Step 3: Take the dewatered sludge with a water content of 80%, and then mix it with the lower soil with a water content of 20% after excavati...

Embodiment 2

[0030] A method for preparing nutrient soil by anaerobic fermentation of sludge, comprising the following steps:

[0031] Step 1: Choose a nutrient-poor and thick soil slope away from residential areas, and this slope is far away from water sources and rivers, and the groundwater level is relatively deep. Excavate an anaerobic fermentation tank with a length, width, and height of 4m, of which 20cm of surface soil Collected separately from the subsoil; if there is gravel in the excavated soil, it needs to be sieved, and the sieved soil and gravel are kept separately;

[0032] Step 2: Lay an anti-seepage film on the bottom of the anaerobic fermentation tank dug in step 1 and the surrounding side walls to prevent the fermentation liquid produced by sludge fermentation from polluting the surrounding soil;

[0033] Step 3. Take the dewatered sludge with a water content of 75%, and then mix it with the subsoil with a water content of 20% after excavation and sieving in step 1, and a...

Embodiment 3

[0037] A method for preparing nutrient soil by anaerobic fermentation of sludge, comprising the following steps:

[0038]Step 1: Choose a nutrient-poor and thick soil slope away from residential areas, and this slope is far away from water sources and rivers, and the groundwater level is relatively deep. Excavate an anaerobic fermentation tank with a length, width, and height of 4m, of which 20cm of surface soil Collected separately from the subsoil; if there is gravel in the excavated soil, it needs to be sieved, and the sieved soil and gravel are kept separately;

[0039] Step 2: Lay an anti-seepage film on the bottom of the anaerobic fermentation tank dug in step 1 and the surrounding side walls to prevent the fermentation liquid produced by sludge fermentation from polluting the surrounding soil;

[0040] Step 3. Take the dewatered sludge with a water content of 85%, and then mix it with the subsoil with a water content of 20% after excavation and sieving in step 1, and ad...

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Abstract

The invention relates to a method for making sludge into nutrient soil through anaerobic fermentation. Through a reasonable compounding ratio and reasonable arrangement of substrates in a fermentation tank, step-by-step purification layers of an odor substrate adsorption layer, a microbial decomposition layer and a plant absorption layer are formed, so that less odor is given off into air, or the odor is prevented from being given off into the air; in addition, a methane collecting system is paved at the upper part of the anaerobic fermentation tank, so that recycling of sludge energy resources can also be realized. Through 12-month long-time anaerobic fermentation, organic matters which are easy to decompose in sludge can be converted into stable humus type substances, and the content of humus is increased by about 25%. The high-temperature stage duration in the anaerobic fermentation process is long, so that original pathogenic bacteria in the sludge can be killed. The sludge is mixed with alkali soil, so that curing and passivating effects on original heavy metal can be achieved, the validity of the heavy metal is reduced by about 50%, besides, the decomposition effect on antibiotics and durable organic compounds contained in the sludge can be achieved, and the harmfulness of the sludge is reduced.

Description

technical field [0001] The invention relates to the technical field of solid waste resource treatment, in particular to a method for preparing nutrient soil by anaerobic fermentation of sludge. Background technique [0002] The dewatered sludge of urban sewage plants is the solid waste generated from the treatment of wastewater in urban sewage plants. With the increase in the number of sewage plants under construction in my country, the sludge output will still increase. Municipal sludge contains a large amount of organic matter and nutrients needed by plants such as N, P and K. Using sludge as a vegetable substrate after fermentation treatment is an effective way to achieve the reduction, harmlessness and resource utilization of such solid waste. The open-air aerobic fermentation that is usually used has a lot of air pollution, and the advanced fermentation process requires a lot of equipment and power. Compared with the nutrient soil produced by aerobic fermentation, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G1/00C05F17/00C01B31/12
CPCC05D9/00C05F5/002C05F9/04C05F17/00C05F7/00C05F11/00C05F11/08Y02E50/30Y02W30/40
Inventor 常会庆杨学志杨元涛雷全奎李竞天
Owner HENAN UNIV OF SCI & TECH
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