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Livestock and poultry manure resource utilization method

A technology for recycling livestock and poultry manure, which is applied in the field of resource utilization of livestock and poultry manure, can solve the problems of secondary pollution, long period of decomposing process and high transportation cost, and achieves mild reaction conditions, high yield and simple operation steps. Effect

Active Publication Date: 2021-01-15
ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the decomposing process of livestock and poultry manure composting has a long cycle, covers a large area, is prone to produce odor and leachate, and has a large amount of decomposed organic fertilizer; Secondary pollution
In addition, neither anaerobic fermentation nor aerobic composting can effectively solve the problem of copper and other heavy metals in the fermentation products of livestock and poultry manure. With the fertilizer application of compost products or biogas slurry / biogas residue, the accumulation of heavy metals in soil crops , leading to food safety issues

Method used

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  • Livestock and poultry manure resource utilization method

Examples

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Effect test

Embodiment 1

[0038]The livestock and poultry manure in this embodiment is specifically pig manure from a pig farm, and the solid content is 30-50wt%, Cu2+The content is 800~1500mg / kg; the treatment method of the animal manure is as follows:

[0039]Mix livestock and poultry manure with sulfuric acid with a concentration of 10wt%, wherein the molar ratio of copper ion in livestock manure to sulfate in sulfuric acid is 1:2.0, so that copper ions are fully combined with sulfate to form copper sulfate; The solid content of the system was adjusted to 20wt%, transferred to a hydrothermal reactor, heated to 120°C, and carried out hydrothermal carbonization reaction for 6h; after the hydrothermal carbonization reaction was completed, the resulting system was cooled to room temperature (25°C) and then pumped Filter to obtain solid carbonized product and hydrothermal liquid;

[0040]Mix the potassium hydroxide solution with a concentration of 10wt% with the solid carbonized product so that the pH of the resulti...

Embodiment 2

[0043]In this example, livestock manure is specifically chicken manure from a chicken farm, with a solid content of 40 to 70 wt%, and Cu2+The content is 500~1000mg / kg; the treatment method of the animal manure is as follows:

[0044]Mix livestock and poultry manure with sulfuric acid with a concentration of 1% by weight, wherein the molar ratio of copper ion in livestock manure to sulfate in sulfuric acid is 1:1.0, so that the copper ion is fully combined with sulfate to form copper sulfate; The solid content of the system was adjusted to 30wt%, transferred to a hydrothermal reactor, heated to 280°C, and carried out a hydrothermal carbonization reaction for 0.5h; after the hydrothermal carbonization reaction was completed, the resulting system was cooled to room temperature (25°C) before proceeding Suction filtration to obtain solid carbonized product and hydrothermal liquid;

[0045]Mix potassium hydroxide solution with a concentration of 1% by weight with the solid carbonized product, s...

Embodiment 3

[0048]The livestock and poultry manure in this embodiment is specifically cattle manure from a cattle farm, and the solid content is 20-50wt%, and Cu2+The content is 200~500mg / kg; the treatment method of the animal manure is as follows:

[0049]Mix livestock manure with sulfuric acid with a concentration of 5wt%, wherein the molar ratio of copper ion in livestock manure to sulfate radical in sulfuric acid is 1:1.5, so that copper ion is fully combined with sulfate radical to form copper sulfate; The solid content of the system was adjusted to 15wt%, transferred to a hydrothermal reactor, heated to 120℃, and carried out hydrothermal carbonization reaction for 6h; after the hydrothermal carbonization reaction was completed, the resulting system was cooled to room temperature (25℃) and then pumped Filter to obtain solid carbonized product and hydrothermal liquid;

[0050]Mixing a potassium hydroxide solution with a concentration of 5% by weight with the solid carbonized product, so that the ...

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Abstract

The invention provides a livestock and poultry manure resource utilization method, and belongs to the technical field of waste treatment and disposal. The livestock and poultry manure resource utilization method provided by the invention comprises the following steps: (1) mixing livestock and poultry manure with sulfuric acid to obtain a mixed feed liquid; (2) carrying out hydrothermal carbonization treatment on the mixed feed liquid, and then carrying out solid-liquid separation on an obtained product system to obtain hydrothermal liquid and a solid carbonized product; (3) mixing the hydrothermal solution with lime water to obtain a liquid containing a bactericide component; mixing the solid carbonized product with a potassium hydroxide solution to obtain a mixed material with the pH value of 6.0-8.0, and drying the mixed material to be used as a soil conditioner; or mixing the mixed material with livestock and poultry manure and urea, and composting and fermenting to obtain the carbon-based organic fertilizer. The method provided by the invention can realize harmless and reduction treatment of the livestock and poultry manure in the whole process, and can realize full-factor resource utilization of the livestock and poultry manure.

Description

Technical field[0001]The invention relates to the technical field of waste treatment and disposal, in particular to a method for resource utilization of animal manure.Background technique[0002]The composition of livestock and poultry manure is complex, in addition to rich in organic matter and plant nutrients such as nitrogen, phosphorus, potassium and other mineral elements, it also contains urate, sulfide, amine compounds, bacteria, pest eggs, antibiotics, copper and zinc Poisonous and harmful substances such as heavy metals, and are prone to produce greenhouse gases and harmful gases. At present, the mainstream domestic and foreign livestock manure treatment technologies are aerobic composting and anaerobic fermentation. Through aerobic composting, livestock and poultry manure is converted into decomposed organic fertilizer; anaerobic fermentation with the goal of energy production not only produces biogas, but also produces a large amount of biogas slurry and residue. However, t...

Claims

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Application Information

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IPC IPC(8): C02F11/10C02F11/00
CPCC02F11/10C02F11/00C02F2103/20Y02W30/40
Inventor 张进王敏艳
Owner ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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