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Method for comprehensively treating oyster shells based on anaerobic digestion

An anaerobic digestion and comprehensive treatment technology, applied in the field of waste recycling, can solve the problems of water eutrophication, easy loss of nutrients, loss of phosphorus fertility, etc., and achieve the effects of promoting microbial activity, promoting anaerobic digestion, and preventing acidification

Pending Publication Date: 2022-03-08
QUANZHOU INST FOR ENVIRONMENTAL PROTECTION IND NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, after effective treatment, biogas residue can be used as an organic fertilizer rich in nitrogen, phosphorus and potassium for land application, but in the process of land application, there is a problem of easy loss of nutrients
In particular, livestock and poultry manure is rich in phosphorus. The soluble phosphorus in the biogas residue after anaerobic digestion is easy to enter the natural water body with the surface runoff, which not only causes the loss of phosphorus fertility, but also leads to the occurrence of eutrophication in the water body.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A method for comprehensively processing oyster shells based on anaerobic digestion, comprising the following steps:

[0036] Step 1, after drying the oyster shells, crushing and grinding them to make oyster shell powder;

[0037] Step 2: Mix oyster shell powder and livestock and poultry manure evenly and then add them to the anaerobic digestion reactor, inoculate anaerobic fermentation organisms, and carry out anaerobic culture. The anaerobic fermentation temperature is 35°C, and the fermentation time is 30 days;

[0038] Step 3, after the gas production is finished, the oyster shell powder and biogas residue mixture is taken out from the fermentation reactor for dehydration treatment to reduce the moisture content;

[0039] Step 4: naturally air-dry the dehydrated oyster shell powder and biogas residue mixture and crush it to obtain an organic fertilizer.

[0040] Wherein, in step 1, the oyster shells are naturally dried or air-dried; the particle size of the oyster s...

Embodiment 2

[0045] A method for comprehensively processing oyster shells based on anaerobic digestion, comprising the following steps:

[0046] Step 1, after drying the oyster shells, crushing and grinding them to make oyster shell powder;

[0047] Step 2: Mix oyster shell powder and livestock and poultry manure evenly and add them to the anaerobic digestion reactor, inoculate anaerobic fermentation organisms, and carry out anaerobic cultivation. The anaerobic fermentation temperature is 38°C, and the fermentation time is 20 days;

[0048] Step 3, after the gas production is finished, the oyster shell powder and biogas residue mixture is taken out from the fermentation reactor for dehydration treatment to reduce the moisture content;

[0049] Step 4: naturally air-dry the dehydrated oyster shell powder and biogas residue mixture and crush it to obtain an organic fertilizer.

[0050] Wherein, in step 1, the oyster shells are naturally dried or air-dried; the particle size of the oyster sh...

Embodiment 3

[0055] A method for comprehensively processing oyster shells based on anaerobic digestion, comprising the following steps:

[0056] Step 1, after drying the oyster shells, crushing and grinding them to make oyster shell powder;

[0057] Step 2: Mix oyster shell powder and livestock and poultry manure evenly and add them to the anaerobic digestion reactor, inoculate anaerobic fermentation organisms, and carry out anaerobic culture. The anaerobic fermentation temperature is 37°C, and the fermentation time is 25 days;

[0058]Step 3, after the gas production is finished, the oyster shell powder and biogas residue mixture is taken out from the fermentation reactor for dehydration treatment to reduce the moisture content;

[0059] Step 4: naturally air-dry the dehydrated oyster shell powder and biogas residue mixture and crush it to obtain an organic fertilizer.

[0060] Wherein, in step 1, the oyster shells are naturally dried or air-dried; the particle size of the oyster shell p...

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Abstract

A method for comprehensively treating oyster shells based on anaerobic digestion comprises the following steps: step 1, drying oyster shells, and crushing and grinding the oyster shells to prepare oyster shell powder; step 2, uniformly mixing the oyster shell powder and the livestock and poultry manure, adding the mixture into an anaerobic digestion reactor, inoculating anaerobic fermentation organisms, and carrying out anaerobic culture at the anaerobic fermentation temperature of 35-38 DEG C for 20-30 days; 3, after gas production is finished, taking out the mixture of the oyster shell powder and the biogas residues from the fermentation reactor, and performing dehydration treatment to reduce the water content; 4, the dehydrated mixture of the oyster shell powder and the biogas residues is naturally air-dried and crushed, and the organic fertilizer is obtained.The oyster shell and biogas residue mixed organic fertilizer is prepared by combining the oyster shells with the anaerobic digestion process, so that resource utilization of the two kinds of waste including the oyster shells and the livestock and poultry manure is effectively achieved; meanwhile, by virtue of the synergistic effect between the two components, the organic fertilizer which can be effectively utilized is formed.

Description

technical field [0001] The invention belongs to the technical field of waste recycling, and in particular relates to a method for comprehensively treating oyster shells based on anaerobic digestion. Background technique [0002] Biogas production by anaerobic digestion is an effective means of treating agricultural waste, livestock and poultry manure, and can generate biomass energy at the same time. In addition, after effective treatment, biogas residue can be used as an organic fertilizer rich in nitrogen, phosphorus and potassium for land application, but in the process of land application, there is a problem of easy loss of nutrients. In particular, livestock and poultry manure is rich in phosphorus. The soluble phosphorus in the biogas residue after anaerobic digestion is easy to enter the natural water body with the surface runoff, which not only causes the loss of phosphorus fertility, but also leads to the occurrence of eutrophication in the water body. In the proce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05F15/00C05F17/20C05F1/00
CPCC05F1/007C05F17/20C05F3/00Y02A40/20Y02W30/40
Inventor 王永峰胡大波季荣陈继锡邓东阳
Owner QUANZHOU INST FOR ENVIRONMENTAL PROTECTION IND NANJING UNIV
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