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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  • Summary
  • 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 pil

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

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Example Embodiment

[0033] Example 1

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

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

Example Embodiment

[0042] Example 2

[0043] The modified oyster shells immobilized with fulvic acid in Example 1 were applied to the continuous high-temperature aerobic composting process of biogas residues. The addition amount was 0.42 times the dry weight of the biogas residue, denoted as T2, and the original oyster shell was used as the additive, and the addition amount was 0.42 times the dry weight of the biogas residue, denoted as T1, and the control group without additives was used. The compost is made of biogas residue, mixed with different additives evenly, and placed in a 2.5L, 55°C constant temperature reactor. The initial water content is adjusted to about 65%, and the ventilation rate is 0.1L / min / kg. The ammonia at the end of the reaction device The gas absorption device was filled with 2% boric acid solution. The composting cycle was 23 days, and samples were taken on the 0th, 3rd, 6th, 10th, 16th, and 23rd days to measure the compost index according to the literature standard met...

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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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