A joint treatment method for sweet sorghum plants rich in heavy metals

A heavy metal and sweet sorghum technology, which is applied in the field of joint disposal of sweet sorghum plants rich in heavy metals, can solve problems such as difficulty in squeezing juice, uncontrollable discharge of heavy metals in wastewater, water pollution, etc., and achieve the effect of shortening the fermentation time

Active Publication Date: 2019-09-27
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although liquid fermentation is the most commonly used method for biofuel ethanol, the process of liquid fermentation of sweet sorghum stalks has disadvantages such as difficulty in squeezing juice and serious water pollution problems, and it is basically impossible to control trace heavy metals in wastewater discharge

Method used

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  • A joint treatment method for sweet sorghum plants rich in heavy metals
  • A joint treatment method for sweet sorghum plants rich in heavy metals
  • A joint treatment method for sweet sorghum plants rich in heavy metals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1 The solid-state fermentation technology of sweet sorghum stalk

[0036] The sweet sorghum used in the test was planted in cadmium-contaminated farmland in Shaoguan, Guangdong. The cadmium concentration in the soil was 7.93mg / kg, the effective cadmium content was 2.89mg / kg, the sugar content of the stem was 11.3%, and the fresh weight was 750g / plant. Adopting advanced solid state fermentation (ASSF) technology and unique strains with high temperature resistance and high metabolic efficiency (the strain is Saccharomyces cerevisiae Hansen) TSH2, the main fermentation time is completed within 20 hours, the ethanol yield is over 90%, and the whole process Almost no waste water is produced, effectively reducing the secondary pollution of heavy metals.

[0037] The specific operation method is as follows: strip the fresh sweet sorghum stalk leaves and pulverize and mix evenly (diameter 1-5mm, length less than 50mm), weigh 10kg of pulverized material, and insert th...

Embodiment 2

[0039] Example 2 Combustion technology of sweet sorghum stalk fermentation residue and waste

[0040] Using tube furnace combustion technology, the combustion system consists of gas distribution system, tube furnace, fly ash collection system and flue gas absorption system. The gas distribution system consists of gas cylinders, valves and gas flow meters to control the gas flow rate. The tube furnace uses SK2-4-10 high-temperature tube furnace as the burner, and the furnace temperature can be set arbitrarily at 500-1200 °C according to the experimental needs. The fly ash produced by combustion is filtered and collected by the glass fiber filter cartridge in the filter cartridge holder. The flue gas absorption system consists of a series of absorption bottles filled with 5% HNO 3 +10%H 2 o 2 The mixed solution is used to absorb gaseous heavy metals.

[0041] The specific operation method is: accurately weigh 4.000g of sweet sorghum stalk fermentation residue, study the mig...

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Abstract

The invention provides a combined treatment method for Sorghum bicolor (Linn.) Moench plants rich in heavy metals. According to the method, Sorghum bicolor (Linn.) Moench stalks are firstly fermentedby adopting an advanced solid state fermentation technology to produce ethanol with economic value, wherein specific Saccharomyces cerevisiae Hansen TSH2 is selected, so that the fermentation time isfurther shortened while the ethanol yield is more than 90%; and then combustion treatment is carried out on a large quantity of fermentation slags of the Sorghum bicolor (Linn.) Moench stalks generated after fermentation, the combustion temperature is controlled so as to recycle fly ash generated after combustion and cadmium in furnace slags to the largest extent, and meanwhile, heat energy with economic value is generated for ethanol production, power generation or heat supply. The method has the advantages that the solid state fermentation technology and the combustion technology are effectively integrated, and therefore safe treatment of the remediation plants can be effectively realized, and the economical efficiency and the environmental protection property can be achieved.

Description

technical field [0001] The invention relates to the field of environmental restoration of farmland polluted by heavy metals, in particular to a combined treatment method for sweet sorghum plants rich in heavy metals, and belongs to the fields of comprehensive recovery and utilization of plant resources and environmental protection. Background technique [0002] Phytoremediation refers to the use of plants with a strong ability to accumulate heavy metals to transfer and store heavy metals in the aboveground parts of plants through absorption and transport, and finally achieve the purpose of reducing heavy metal content in the soil by harvesting the aboveground parts. There are two main methods: one is Use the super-absorbing capacity of super-accumulative plants to extract heavy metals in the soil; the second is to select non-super-accumulative plants that grow rapidly, have large biomass, and have a relatively strong ability to accumulate heavy metals to extract heavy metals....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23G7/02C12P7/10C12R1/865
CPCY02E50/10Y02P20/133Y02P20/59
Inventor 李十中李纪红薛忠财仉磊
Owner TSINGHUA UNIV
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