Method for controlling highly toxic substances in biochar by using waste plastics

A technology for waste plastics and highly toxic substances, which is applied in the fields of environmental protection and solid waste resource utilization, and achieves the effect of wide sources, low price and large quantity

Inactive Publication Date: 2021-05-14
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, adding metal salts is an additional expense

Method used

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  • Method for controlling highly toxic substances in biochar by using waste plastics
  • Method for controlling highly toxic substances in biochar by using waste plastics
  • Method for controlling highly toxic substances in biochar by using waste plastics

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Wheat Protein (with 10% K 2 CO 3 ) and a single plastic polymer polyvinyl chloride (PVC), polytetrafluoroethylene (PTFE) or triphenyl phosphate (TPP) are mixed in a certain mass ratio, and the mass ratio of wheat protein to plastic is 10% (w / w). After the powder was fully mixed, put it into a porcelain boat, put it in a tube furnace, and put it in the N at a flow rate of 0.1 L / min. 2 Under the atmosphere, the temperature was raised to 700 °C at a rate of 10 °C / min, and maintained for 90 minutes, and cooled to room temperature after the reaction was completed. Put the obtained biochar in a glass tube, add an appropriate amount of NaOH solution for extraction, filter and dilute to an appropriate concentration, and use ion chromatography to determine CN - content. like figure 2 As shown, the three plastics all have obvious inhibitory effects on the cyanide of biochar, and PVC and PTFE almost completely inhibit the CN - generation.

Embodiment 2

[0025] Wheat Protein (with 10% K 2 CO 3 ) The plastic phosphorus additive triphenyl phosphate is mixed according to a certain mass ratio, and the mass ratios of wheat protein and triphenyl phosphate are 0%, 5%, 25% and 50% (w / w) respectively. After the powder was fully mixed, put it into a porcelain boat, put it in a tube furnace, and put it in the N at a flow rate of 0.1 L / min. 2 Under the atmosphere, the temperature was raised to 700 °C at a rate of 10 °C / min, and maintained for 90 minutes, and cooled to room temperature after the reaction was completed. Put the obtained biochar in a glass tube, add an appropriate amount of NaOH solution for extraction, filter and dilute to an appropriate concentration, and use ion chromatography to determine CN - content. like image 3 As shown, the addition of phosphorus-containing plastic components has a significant effect on the CN in biochar - The formation of biochar has a significant impact. When the plastic dosage is 50%, the C...

Embodiment 3

[0027] Wheat Protein (with 10% Na 2 CO 3 ) and plastic chlorine-containing additive chlorinated paraffin 70 are mixed in a certain mass ratio, and the mass ratio of wheat protein to chlorinated paraffin 70 is 0%, 2%, 5%, 10% (w / w). After the powder was fully mixed, put it into a porcelain boat, put it in a tube furnace, and put it in the N at a flow rate of 0.1 L / min. 2 Under the atmosphere, the temperature was raised to 700°C at a rate of 10°C / min and maintained for 90 minutes, and cooled to room temperature after the reaction was completed. Put the obtained biochar in a glass tube, add an appropriate amount of NaOH solution for extraction, filter and dilute to an appropriate concentration, and use ion chromatography to determine CN - content. like Figure 4 As shown, the addition of chlorine-containing plastic components has a significant effect on the CN in biochar - The formation of biochar has a significant impact. When the plastic dosage is 10%, the CN in biochar -...

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Abstract

The invention relates to a method for controlling highly toxic substances in biomass by using waste plastics. The biomass comprises kitchen waste, edible fungus residues, algae, crop straw, rice husks, bean dregs, rape seed cakes, biogas residues, sludge and livestock and poultry manure, wherein a plastic component containing heteroatoms is used as a control agent. In the reaction process, heteroatoms in the plastic can be complexed with unstable oxygen-containing alkali metal salt in the biomass to inhibit the generation of metal cyanide. According to the method, common waste plastic in urban solid waste is used as a control agent, and one-pot pyrolysis is adopted to realize in-situ control of highly toxic metal cyanide in biochar. The method is simple in process, the plastic is wide in source and easy to obtain, extra inhibitor expenditure is not needed, and the recycling problem of the waste biomass and the plastic can be solved at the same time. In addition, the method has a positive promotion effect on more friendly environmental application of the biochar, and is beneficial for realizing complementary economic, social and ecological benefits.

Description

technical field [0001] The invention belongs to the fields of environmental protection and solid waste resource utilization, and in particular relates to a method for controlling highly toxic substances in biochar by using waste plastics. Background technique [0002] Biochar is a carbon-rich material obtained through pyrolysis technology. It is considered to be a multifunctional material that can achieve carbon sequestration and emission reduction, improve soil, and reduce environmental pollution, and has broad application prospects. With the requirements for the industrialization and standardization of biochar, the "regulation" of biochar has gradually attracted attention. Voluntary organizations in some countries and regions, such as the American Biochar Initiative (IBI), European Biochar Certification Body (EBC), British Biochar Foundation (BBF), Japan Biochar Association (JBA), etc. Quality has established relevant standards. [0003] The establishment of standards fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05C09K17/02C09K101/00
CPCC01B32/05C09K17/02C09K2101/00
Inventor 朱向东张士成罗洁文
Owner FUDAN UNIV
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