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A kind of compound metal polluted alfalfa reutilization method

A compound metal and alfalfa technology, which is applied in the field of compound metal contaminated alfalfa reuse, can solve the problems of insufficient research on alfalfa reuse, inhibition, toxicity, etc., and achieve the effect of improving the utilization rate of biomass resources

Active Publication Date: 2021-02-02
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, if the metal is in excess, it may cause inhibition or toxicity [7-9]
Although studies have shown that alfalfa can enrich and absorb metals in the soil, there is insufficient research on the reuse of metal-contaminated alfalfa, especially the lack of research on the anaerobic fermentation of alfalfa polluted by metals to produce methane
Up to now, the anaerobic fermentation of alfalfa polluted by complex metals has not been reported

Method used

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  • A kind of compound metal polluted alfalfa reutilization method

Examples

Experimental program
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Effect test

Embodiment 1

[0043] In this example, the fermentation raw materials of the anaerobic fermentation experiment were selected from the alfalfa straw and cow dung polluted by the composite metal, and the part above the root of the alfalfa was selected. Alfalfa grass and cow dung were taken from Xuanhua District, Zhangjiakou. The concentration of each metal in alfalfa grass is: magnesium 4300mg / kg, calcium 11000mg / kg, zinc 42mg / kg, iron 2000mg / kg, nickel 1.19mg / kg, copper 100mg / kg, chromium 4.03mg / kg.

[0044] The air-dried alfalfa straw was ground with a pulverizer and passed through a 0.5mm standard soil sieve. The dry matter ratio of alfalfa straw and cow dung is 1:2. The total volume of the anaerobic fermentation device tank is 500mL, the working volume is 300mL, and the total solid concentration is 8%. The fermentation raw materials and deionized water were added according to the above proportions, and then 10.0 mg / L of copper and 1.0 mg / L of cobalt were added to the fermentation tank, a...

Embodiment 2

[0046] In this example, the fermentation raw materials of the anaerobic fermentation experiment were selected from the alfalfa straw and cow dung polluted by the composite metal, and the part above the root of the alfalfa was selected. The air-dried alfalfa straw was ground with a pulverizer and passed through a 0.5mm standard soil sieve. The concentration of each metal in alfalfa grass is: magnesium 4000mg / kg, calcium 11000mg / kg, zinc 36mg / kg, iron 1500mg / kg, nickel 7.81mg / kg, copper 300mg / kg, chromium 3.89mg / kg. Alfalfa grass and cow dung were taken from Xuanhua District, Zhangjiakou. The dry matter ratio of alfalfa straw and cow dung is 1:1.5. The total volume of the anaerobic fermentation device tank is 500mL, the working volume is 300mL, and the total solid concentration is 10%. The fermentation raw materials and deionized water were added according to the above proportions, and then 8.0 mg / L of copper and 0.5 mg / L of cobalt were added to the fermentation tank, and then...

Embodiment 3

[0048] In this example, the fermentation raw materials of the anaerobic fermentation experiment were selected from the alfalfa straw and cow dung polluted by the composite metal, and the part above the root of the alfalfa was selected. The air-dried alfalfa straw was ground with a pulverizer and passed through a 0.5mm standard soil sieve. The concentration of each metal in alfalfa grass is: magnesium 4000mg / kg, calcium 7900mg / kg, zinc 20mg / kg, iron 1500mg / kg, nickel 0.81mg / kg, copper 200mg / kg, chromium 4.03mg / kg. Alfalfa grass and cow dung were taken from Xuanhua District, Zhangjiakou. The dry matter ratio of alfalfa straw and cow dung is 1:1. The total volume of the anaerobic fermentation device tank is 500mL, the working volume is 300mL, and the total solid concentration is 12%. The fermentation raw materials and deionized water were added according to the above proportions, and then 15.0 mg / L of copper and 2.0 mg / L of cobalt were added to the fermenter, and then stirred f...

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Abstract

The invention discloses a method for recycling composite metal contaminated alfalfa, and belongs to the field of biomass waste recycling. The method includes the following steps that copper and cobaltions are added into a fermentation system containing the compound metal contaminated alfalfa, and then fermentation is carried out to generate gas. According to the method, by adding the specific metal ions, the compound metal contaminated alfalfa and cow dung are mixed for anaerobic fermentation to produce methane, so that the purposes of degrading the alfalfa and producing biogas are achieved.

Description

technical field [0001] The invention belongs to the technical field of biomass waste recycling, and in particular relates to a method for recycling alfalfa grass polluted by composite metals. Background technique [0002] In recent years, the concept of using phytoremediation of heavy metal-contaminated land (i.e. phytoremediation) has received increasing attention [1-4] . Compatible with other traditional engineering physicochemical processes, such as excavation, soil leaching, electric remediation, soil incineration, etc. [5] Compared with phytoremediation techniques, there are significant advantages in aesthetic, economic and technical aspects [6] . Phytoremediation technology is a technology that uses higher plants and / or their root microorganisms to remediate pollutants (metals, organic matter, radioactive substances, etc.) in soil, sediment or water through extraction, degradation, fixation or volatilization. [7] . Among them, plant immobilization reduces the mobi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12P5/02C02F11/04
CPCC02F11/04C12P5/023Y02E50/30
Inventor 田永兰郑磊李树森曹宇东张化永徐丹孙建忠
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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