Method for preparing sludge-based biochar mixed with pig manure compost material

A technology of biochar and pig manure pile is applied in the field of pig manure composting, which can solve the problems of destroying the temperature of the bacterial pile and destroying the relationship between the oxygen supply and temperature maintenance of the pile, so as to save the purchase cost, reduce the antibiotic content, reduce the Effects of Environmental Risk

Inactive Publication Date: 2019-12-10
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the composting process, the oxygen content in the compost is generally increased by artificial turning or aeration and oxygenation, but these oxygenation methods will destroy the temperature of the compost required for bacterial growth. To a certain extent, Will destroy the relationship between oxygen supply and temperature maintenance of the pile

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1) Preparation of compost semi-finished products

[0024] 50kg of municipal sludge was taken, concentrated, tempered, and then dehydrated by high-pressure plate and frame filter press to semi-dry sludge with a moisture content of 60%; 10kg of ultra-high temperature composting compound bacteria were added to the semi-dry sludge for mixing, and the After 30 days, the compost semi-finished product is made.

[0025] 2) Preparation of sludge-based biochar

[0026] Another 20kg of municipal sludge was naturally air-dried, dried in an oven at 105°C, crushed and passed through a 200-mesh sieve, and the obtained sludge powder was placed in a pyrolysis furnace in a nitrogen atmosphere, and pyrolyzed at 600°C for 3 hours to obtain pyrolysis sludge powder.

[0027] The pyrolysis sludge powder was first soaked in 1mol / L hydrochloric acid for 5 minutes, then soaked in deionized water, stirred and washed for 20 minutes, filtered, and dried in an oven at 105°C to make sludge-based bi...

Embodiment 2

[0036] 1) Preparation of compost semi-finished products

[0037] 100kg of municipal sludge was taken, concentrated, tempered, and then dehydrated by high-pressure plate and frame filter press to semi-dry sludge with a moisture content of 54%; 20kg of ultra-high-temperature composting compound bacteria were added to the semi-dry sludge for mixing, and after After 35 days, the compost semi-finished product is made.

[0038] 2) Preparation of sludge-based biochar

[0039] Another 15kg of municipal sludge was air-dried naturally, dried in an oven at 105°C, crushed and passed through a 200-mesh sieve, and the obtained sludge powder was placed in a pyrolysis furnace in a nitrogen atmosphere, and pyrolyzed at 500°C for 3 hours to obtain pyrolysis sludge powder.

[0040] The pyrolysis sludge powder was first soaked in 1mol / L hydrochloric acid for 5 minutes, then soaked in deionized water, stirred and washed for 20 minutes, filtered, and dried in an oven at 105°C to make sludge-based...

Embodiment 3

[0048] 1) Preparation of compost semi-finished products

[0049] 150kg of municipal sludge was taken, concentrated, tempered, and then dehydrated by high-pressure plate and frame pressure filtration to semi-dry sludge with a moisture content of 54%; 15kg of ultra-high temperature composting compound bacteria were added to the semi-dry sludge for mixing, and after After 32 days, the compost semi-finished product is made.

[0050] 2) Preparation of sludge-based biochar

[0051] Another 15kg of municipal sludge was air-dried naturally, dried in an oven at 105°C, crushed and passed through a 200-mesh sieve, and the obtained sludge powder was placed in a pyrolysis furnace in a nitrogen atmosphere, and pyrolyzed at 400°C for 2 hours to obtain pyrolysis sludge powder.

[0052] The pyrolysis sludge powder was first soaked in 1mol / L hydrochloric acid for 5 minutes, then soaked in deionized water, stirred and washed for 20 minutes, filtered, and dried in an oven at 105°C to make sludg...

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Abstract

The invention relates to a method for preparing sludge-based biochar mixed with a pig manure compost material. The method for preparing the sludge-based biochar mixed with the pig manure compost material comprises the steps that municipal sludge is first concentrated, hardened and tempered, dehydrated, and mixed with ultra-high temperature compost compound bacteria to prepare a semi-finished compost; municipal sludge is taken for being subjected to natural air-drying, drying, and crushing and then put into a pyrolysis furnace for pyrolysis to obtain sludge pyrolysis powder, then the sludge pyrolysis powder is soaked with hydrochloric acid and then soaked and washed with deionized water for 20 min, the mixture is filtered and then dried to prepare the sludge-based biochar; and dried and crushed pig manure, the semi-finished compost and the sludge-based biochar are mixed according to the ratio of 4 to (10 to16) to1 in parts by weight, the moisture content is adjusted between 45% and 60%for secondary composting, and the sludge-based biochar mixed with the pig manure compost material with effective reduction of antibiotic content is obtained. The antibiotic content in pig manure can be effectively reduced; the total amount of antibiotic in the pig manure is nearly 700 mg/kg and is effectively reduced to 25 mg/kg or less, and the concept of "using waste to treat waste" is achieved.

Description

technical field [0001] The invention relates to the technical field of pig manure composting, in particular to a method for preparing sludge-based biochar mixed with pig manure compost, which utilizes municipal sludge composted semi-finished products as auxiliary aggregates and mixes sludge-based biochar. The method is a method for effectively reducing the antibiotics in the compost in the combined compost with intensive pig manure as the main material. [0002] technical background [0003] In intensive pig farms, a large number of antibiotics are used to prevent and treat animal diseases. Most of them are water-soluble and have a low adsorption utilization rate in the animal intestines, resulting in about 80% of antibiotics being finally excreted with pig manure. Improper handling of pig manure and a large amount of antibiotic residues will cause compound pollution to the environment. Therefore, it is very important and urgent to fully and effectively reduce antibiotics in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05F17/00C05G3/00
CPCC05D9/00C05G3/00Y02W30/40
Inventor 郑育毅柯壹红刘常青吴春山孙启元王菲凤刘文伟谢蓉蓉汪清环高滢郭绍英
Owner FUJIAN NORMAL UNIV
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