A kind of preparation method and application of modified oyster shell powder

A technology of oyster shell powder and oyster shell, which is applied in the application, inorganic fertilizer, calcareous fertilizer and other directions, can solve the problems of occupying land resources, environmental pollution, etc., and achieves the effects of high material strength, reduced production cost, and attractive application prospects.

Active Publication Date: 2022-04-05
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The annual output of oysters in my country is more than 10 million tons, and oyster shells, which account for 70% of the oyster mass, are piled up randomly as waste, which not only takes up a lot of land resources, but also causes serious environmental pollution due to corruption and odor.

Method used

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  • A kind of preparation method and application of modified oyster shell powder
  • A kind of preparation method and application of modified oyster shell powder
  • A kind of preparation method and application of modified oyster shell powder

Examples

Experimental program
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Effect test

Embodiment 1

[0034] The solid-phase grafting method uses maleic anhydride as a graft monomer and dibenzoyl peroxide as an initiator to immobilize fulvic acid on the surface of oyster shells to obtain an immobilized fulvic acid material. The specific process is as follows:

[0035]Mix 30g of oyster shell powder and 6g of fulvic acid into a three-necked flask, and mechanically stir at 200rpm for 30min. Add 0.32g of dibenzoyl peroxide and 3g of maleic anhydride to 5g of dimethylformamide and stir to dissolve. This is the initiation system. Add the triggering system dropwise into the above-mentioned three-neck flask mixed with oyster shell powder and fulvic acid under nitrogen protection and stirring conditions, react in a water bath at 70°C for 3 hours, and condense at the same time. After the reaction, the obtained black solid was dried and extracted with deionized water for 24 hours, dried again, and ground to obtain immobilized fulvic acid.

[0036] The prepared immobilized fulvic acid wa...

Embodiment 2

[0043] The modified oyster shell with immobilized fulvic acid in Example 1 was applied to the continuous high-temperature aerobic composting process of biogas residue. The addition amount was 0.42 times of the dry weight of the biogas residue, which was recorded as T2. The original oyster shell was used as the additive, and the addition amount was 0.42 times of the dry weight of the biogas residue, which was recorded as T1. No additive was used as the control group. The compost uses biogas residue as raw material, mixes it evenly with different additives, puts it in a 2.5L, 55°C constant temperature reactor, adjusts the initial water content to about 65%, and the ventilation rate is 0.1L / min / kg. The ammonia at the end of the reaction device The gas absorption unit was filled with 2% boric acid solution. The composting cycle is 23 days, and samples were taken on days 0, 3, 6, 10, 16, and 23 to measure the composting index according to the standard method in the literature.

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Abstract

The invention relates to the field of material modification technology and aerobic fertilizer making process, in particular to a preparation method of modified oyster shell powder and its application as a compost additive to promote composting. The modified oyster shell powder obtained by fixing fulvic acid to oyster shells by a solid-phase grafting method is used as an aerobic composting additive. The immobilized fulvic acid of the present invention not only overcomes the defect of leaching loss of fulvic acid, but also uses porous oyster shell powder to turn waste into wealth, improves the fermentation efficiency of aerobic composting and significantly reduces nitrogen loss. The invention has simple technological process, low cost and good application value.

Description

technical field [0001] The invention relates to the field of material modification technology and aerobic fertilizer making process, in particular to a preparation method of modified oyster shell powder and its application as a compost additive to promote composting. Background technique [0002] Composting technology is an economical, environmentally friendly and sustainable method for treating organic solid waste. Composting degrades organic matter through microbial aerobic fermentation and kills pathogenic bacteria in raw materials. The products can be used as high-quality organic fertilizers to increase crop yields. . However, some organic solid wastes, such as biogas residues, sludge, etc., due to high moisture content, high viscosity, and poor air permeability, lead to short high temperature maintenance time, slow composting process, incomplete degradation of organic matter, and a large amount of ammonia gas emissions during the process. It not only causes environment...

Claims

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Application Information

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IPC IPC(8): C05D3/02C05G3/80
CPCC05D3/02
Inventor 郭荣波路明艺师晓爽杨智满许晓晖
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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