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Method for recycling composite metal contaminated alfalfa

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: 2019-07-12
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • 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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  • Method for recycling composite metal contaminated alfalfa

Examples

Experimental program
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Effect test

Embodiment 1

[0043] The raw material for the anaerobic fermentation experiment in this example is alfalfa straw and cow dung polluted by complex metals, and the part above the root of alfalfa is selected. Both alfalfa and cow dung were collected from Xuanhua District, Zhangjiakou. The concentration of each metal in alfalfa 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] Grind the air-dried alfalfa stalks with a pulverizer, and pass through a 0.5mm standard soil sieve. The dry matter ratio of alfalfa straw and cow dung is 1:2. The total tank volume of the anaerobic fermentation device is 500mL, the working volume is 300mL, and the total solid concentration is 8%. Add the fermentation raw materials and deionized water according to the above ratio, then add 10.0 mg / L copper and 1.0 mg / L cobalt into the fermenter, and then stir well and leave it for 2 hours to stabilize the fermentation broth system. ...

Embodiment 2

[0046] The raw material for the anaerobic fermentation experiment in this example is alfalfa straw and cow dung polluted by complex metals, and the part above the root of alfalfa is selected. Grind the air-dried alfalfa stalks with a pulverizer, and pass through a 0.5mm standard soil sieve. The concentration of each metal in alfalfa is: magnesium 4000mg / kg, calcium 11000mg / kg, zinc 36mg / kg, iron 1500mg / kg, nickel 7.81mg / kg, copper 300mg / kg, chromium 3.89mg / kg. Both alfalfa and cow dung were collected from Xuanhua District, Zhangjiakou. The dry matter ratio of alfalfa straw and cow dung is 1:1.5. The total tank volume of the anaerobic fermentation device is 500mL, the working volume is 300mL, and the total solid concentration is 10%. Add the fermentation raw materials and deionized water according to the above ratio, then add 8.0mg / L copper and 0.5mg / L cobalt into the fermenter, then stir well and leave for 2 hours to stabilize the fermentation broth system. The temperature ...

Embodiment 3

[0048] The raw material for the anaerobic fermentation experiment in this example is alfalfa straw and cow dung polluted by complex metals, and the part above the root of alfalfa is selected. Grind the air-dried alfalfa stalks with a pulverizer, and pass through a 0.5mm standard soil sieve. The concentration of each metal in alfalfa is: magnesium 4000mg / kg, calcium 7900mg / kg, zinc 20mg / kg, iron 1500mg / kg, nickel 0.81mg / kg, copper 200mg / kg, chromium 4.03mg / kg. Both alfalfa and cow dung were collected from Xuanhua District, Zhangjiakou. The dry matter ratio of alfalfa straw and cow dung is 1:1. The total tank volume of the anaerobic fermentation device is 500mL, the working volume is 300mL, and the total solid concentration is 12%. Add the fermentation raw materials and deionized water according to the above ratio, then add 15.0 mg / L copper and 2.0 mg / L cobalt into the fermenter, then stir well and leave for 2 hours to stabilize the fermentation broth system. The temperature ...

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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 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] . With other traditional engineering physical and chemical processes, such as excavation, soil washing, electric restoration, soil incineration, etc. [5] Phytoremediation has significant advantages in terms of aesthetics, economy and technology compared to [6] . Phytoremediation technology is a technology that uses higher plants and / or their root microorganisms to restore pollutants (metals, organic substances, radioactive substances, etc.) in soil, sediment or water through extraction, degradation, fixation or volatilization. [7] . Among them, plant immobilization reduces the mobility of hazardous wastes in...

Claims

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Application Information

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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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