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Method for removing heavy metals of livestock and poultry wastes

A technology for livestock and poultry waste and heavy metals, which is applied in the field of heavy metal removal from livestock and poultry waste, can solve problems such as pollution, excessive heavy metal content in livestock and poultry manure waste, and achieve high-efficiency removal effects

Inactive Publication Date: 2019-01-22
JIANGXI ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the content of heavy metals in livestock and poultry manure wastes seriously exceeds the standard. So far, there is no particularly effective method to remove them, and they are still accumulating year by year. It is urgent to develop simple and efficient methods to solve the problem of heavy metal pollution in livestock and poultry waste.

Method used

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  • Method for removing heavy metals of livestock and poultry wastes
  • Method for removing heavy metals of livestock and poultry wastes
  • Method for removing heavy metals of livestock and poultry wastes

Examples

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preparation example Construction

[0053] In the present invention, the preparation method of the adsorbent preferably includes:

[0054] soaking the biomass raw material in an alkaline solution to obtain the soaked biomass;

[0055] washing the obtained biomass raw material with an acid solution to neutrality to obtain neutral biomass;

[0056] Oxidizing the obtained neutral biomass through an oxidizing agent to obtain oxidized biomass;

[0057] reacting after mixing the obtained oxidized biomass with a cross-linking agent to obtain a reactant;

[0058] The obtained reactant is subjected to first filtration, and the obtained first filter residue is compounded with a calcium salt solution by a solution blending method to obtain a compound;

[0059] The obtained complex is subjected to a second filtration, and the obtained second filter residue is an adsorbent.

[0060] In the invention, the biomass raw material is soaked in an alkali solution to obtain the soaked biomass.

[0061] In the present invention, ...

Embodiment 1

[0086] Screen and activate the bacterial flora with acidic Thiobacillus ferrooxidans and acidic Thiobacillus thiooxidans as the dominant species, inoculate into 250mL 9K medium, add 3.8g of ferrous sulfate and 0.25g of sulfur powder, place in 33 Shake culture in a shaking table at ℃ until the bacteria enter the logarithmic growth phase, and transfer it several times to obtain a culture solution, which is used for microbial pretreatment of livestock and poultry waste. Thiobacillus is the dominant species, and the total number of bacteria is 1×10 8 More than cfu / ml.

[0087] Take pig feces from a pig farm in Jiangxi Province, dry 100g and put it in the leaching column, inject the culture medium from the upper part of the leaching column, inject 150mL of the culture medium, and the rinsing time is 3h. After washing, the eluent was fully de-dried to collect the eluate, and the heavy metal content in the eluate and the pig manure after leaching was analyzed. The results are shown ...

Embodiment 2

[0100] Screen and activate the bacterial flora with acidic Thiobacillus ferrooxidans and acidic Thiobacillus thiooxidans as the dominant species, inoculate into 250mL 9K medium, add 3.8g of ferrous sulfate and 0.25g of sulfur powder, place in 33 Cultivate with shaking in a shaking table at ℃ until the bacteria enter the logarithmic growth phase, and transfer them several times to obtain a culture solution, which is used for microbial pretreatment of livestock and poultry waste. In the culture solution, acidophilic Thiobacillus ferrooxidans and acidophilus Thiobacillus thiooxidans is the dominant species, and the total number of bacteria in the culture medium is 1×10 8 More than cfu / ml.

[0101] Take the mixed solution of biogas slurry and biogas residue after biogas fermentation of pig manure from an environmental protection company in Jiangxi Province, and inoculate the culture solution into the mixed solution pool of biogas slurry and biogas residue. After inoculation, Acido...

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Abstract

The invention provides a method for removing heavy metals of livestock and poultry wastes, and belongs to the technical field of waste treatment, wherein the method includes the steps: cultivating anddomesticating a culture solution with acidithiobacillus ferrooxidans or acidithiobacillus thiooxidans as a dominant strain; mixing the culture solution with the livestock and poultry wastes, and carrying out solid-liquid separation, to obtain a first separation liquid and a first precipitate; mixing the first precipitate with an acid solution, and carrying out solid-liquid separation, to obtain asecond separation solution and a second precipitate; and mixing the first separation solution and the second separation solution with an adsorbent, and adsorbing to remove heavy metals from the separation solution, so as to realize the removal of the heavy metals of the livestock and poultry wastes. The method provided by the invention can efficiently remove the heavy metals Cd, Cr, Cu, Pb and Znfrom the livestock and poultry wastes.

Description

technical field [0001] The invention belongs to the technical field of waste treatment, and in particular relates to a method for removing heavy metals from livestock and poultry waste. Background technique [0002] my country's agricultural modernization process is accelerating, and livestock and poultry breeding is characterized by regionalization and scale. Environmental problems are becoming more and more prominent. Due to the huge amount of manure discharge, statistics in 2012 show that the discharge of pig manure is about 10 million tons, and the amount of sewage discharge is about 99.9 million tons. In the process of livestock and poultry breeding, in order to enhance their disease resistance and promote growth, a large amount of heavy metal additives are used in the feed, and the direct excretion of heavy metals in livestock and poultry manure accounts for more than 95% of the intake. The long-term discharge of manure leads to eutrophication of land and rivers and t...

Claims

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Application Information

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IPC IPC(8): C02F11/02C02F101/20C02F101/22
CPCC02F11/02C02F2101/20C02F2101/22
Inventor 李晓晖艾仙斌黄凯吴照祥计少石
Owner JIANGXI ACADEMY OF SCI
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