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Special pig manure charcoal for amino graft transformation, its preparation method and its application in the reuse of farmland water and nitrogen

A technology of pig manure charcoal and amino, applied in application, chemical instruments and methods, carbon preparation/purification, etc., can solve problems that restrict the efficient development of poultry and livestock breeding, and achieve high value-added utilization problems, reduce nitrogen pollution, Easy to apply effects

Active Publication Date: 2021-03-26
ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A large amount of livestock manure has not been treated and utilized in a timely and effective manner, which has seriously restricted the sustainable and efficient development of my country's livestock breeding industry

Method used

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  • Special pig manure charcoal for amino graft transformation, its preparation method and its application in the reuse of farmland water and nitrogen
  • Special pig manure charcoal for amino graft transformation, its preparation method and its application in the reuse of farmland water and nitrogen
  • Special pig manure charcoal for amino graft transformation, its preparation method and its application in the reuse of farmland water and nitrogen

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A preparation method of special pig manure charcoal for amino graft transformation, the method is specifically:

[0039] 1) Raw material drying: Dehydrate the raw pig manure to a moisture content of 80%-85%, using 1mol / L HNO 3For pickling, the stirrer is stirred slowly for 3 hours at a speed of 100-200r / min, stirred quickly for 1 hour at a speed of 500-600r / min, dried in an oven at 100°C for 12 hours, and crushed to a particle size of <0.1mm to obtain dry pig manure powder.

[0040] 2) Liquid nitrogen pretreatment and high temperature carbonization:

[0041] Dry pig manure powder is sealed with liquid nitrogen. The weight ratio of dry pig manure powder to liquid nitrogen is 2:1. The magnetic stirring speed is 300 rpm. The weight ratio of the powder is 2:1, and the addition is completed in 4 minutes, followed by washing with water, filtering, and drying in an oven at 100°C for 12 hours. The dried product is carbonized in a high-temperature tube furnace, the carbonizati...

Embodiment 2

[0050] Adopting the special-purpose pig manure charcoal of amino graft transformation that the embodiment 1 makes realizes the method for strengthening and reducing the nitrogen pollution of farmland dewatering, specifically:

[0051] The high-efficiency adsorption reactor is composed of three sequentially connected reaction pools, and the volume ratio of the first, second, and third reaction pools is 3:1:2. In the first reaction pool, special pig manure charcoal was added for amino graft transformation. In the method, the returned water from the farmland enters the pig manure charcoal high-efficiency adsorption reactor for treatment, and the reactor continuously flows into the water, and the hydraulic retention time is 48 hours.

[0052] The first reaction tank is used for rapid adsorption. There is a turbine agitator at the bottom with a rotation speed of 500r / min. Special pig manure charcoal for amino grafting transformation is put into the tank. The ratio of the volume of ...

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Abstract

The invention relates to a preparation method of a carbon-based fertilizer, in particular to a special-purpose pig manure charcoal modified by grafting with amino groups, a preparation method and its application in the reuse of farmland dewatered nitrogen. A preparation method of special pig manure charcoal for amino graft transformation, the method comprising the following steps: 1) Drying of raw materials: dehydrating the raw pig manure to a water content of 80%-85%, followed by pickling, drying and crushing to obtain dried pig manure manure powder; 2) liquid nitrogen pretreatment and high-temperature carbonization to obtain expanded pig manure charcoal; 3) carboxylation treatment to obtain carboxylated pig manure charcoal; 4) amino grafting: the carboxylated pig manure charcoal prepared in step 3) Add ammonia fluid, stir for 20-24h under 200-240°C oil bath heating condition, after cooling to room temperature, wash and filter the reaction product, and use N 2 After drying, the product was vacuum-dried at 110±5°C for 12-24 hours, and then ground to obtain pig manure charcoal for amino graft transformation.

Description

technical field [0001] The invention relates to a preparation method of carbon-based fertilizer, in particular to a special-purpose pig manure charcoal modified by amino grafting, the preparation method and its application in the field of farmland dewatering and nitrogen reuse, belonging to the comprehensive utilization of waste and the non-point source of nitrogen and phosphorus in farmland The field of pollution prevention and control. Background technique [0002] Biochar materials have been widely used in many fields in the environment because of their porous properties, large specific surface area, and excellent performance in soil improvement and conditioning, water retention and fertilizer retention. The rapid development of agricultural technology in the new era has led to the excessive application of chemical fertilizers, pesticides and other elements in the planting industry and the random discharge of livestock and poultry manure in the breeding industry, which ex...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/20B01J20/30C02F11/10C02F1/28C01B32/05C01B32/324C01B32/354C05G3/40C05G3/80
CPCB01J20/20C02F11/10C02F1/281C01B32/05C01B32/324C01B32/354C05D9/00C05G3/40C05G3/80Y02P20/54Y02A40/20B01J20/3219B01J20/3248B01J20/3078C05C11/00B01J20/28061B01J20/3204B01J20/3071B01J20/3085B01J20/3021C05F3/00C02F2101/105C02F2101/16C02F1/283C05G5/40C02F2103/20C05C3/00
Inventor 单胜道庄海峰潘根兴谢巧娜
Owner ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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