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Method for biological ex-situ degradation of formaldehyde

A formaldehyde and ectopic technology, which is applied in the field of ectopic biodegradation of volatile organic pollutants, can solve the problems of cumbersome steps, large quantities, and many varieties, and achieve simple and convenient operation, low energy consumption, and low cost Effect

Inactive Publication Date: 2019-04-19
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, anthraquinone oxidation produces H 2 o 2 The steps are cumbersome, there are objective unsafe factors in the production process, and there are many types and quantities of flammable and explosive substances involved, and H 2 o 2 It is a strong oxidizing agent with lively properties, and it has strict requirements on external conditions and container materials during storage, packaging and transportation. Therefore, it is necessary to find an in-situ self-synthesized 2 o 2 technology is particularly important

Method used

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  • Method for biological ex-situ degradation of formaldehyde
  • Method for biological ex-situ degradation of formaldehyde
  • Method for biological ex-situ degradation of formaldehyde

Examples

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Embodiment 1

[0065] Based on the method of microbial in-situ degradation of formaldehyde, in-situ biodegradation of formaldehyde is carried out in two ways, one is a microbial suspension growth system, and the other is a biofilm system. The steps are as follows:

[0066] 1) Suspension growth system is to take the sewage from the sewage treatment plant as the source of microorganisms, and add the nutrients required by the microorganisms [sodium acetate 1.0g L -1 , phosphate buffer (50mM PBS, NH 4 Cl 0.31g L -1 ,KCl 0.13g·L -1 ,NaH 2 PO 4 2H 2 O 2.772g·L -1 , Na 2 HPO 4 4.576g·L -1 ), metal solution 12.5mL·L -1 , and vitamin solution 5mL·L -1 ], expose oxygen to the solution for 10min, add high-concentration formaldehyde solution to make the concentration respectively 6, 8, 10 and 20mg / L, seal with tinfoil paper and plastic wrap, and treat for 24h.

[0067] 2) The biofilm system is also the sewage from the sewage treatment plant as the source of the carbon cloth to enrich the mic...

Embodiment 2

[0070] Synthesis of H based on microbial electrochemical system 2 o 2 And realize the biological heterotopic degradation formaldehyde method, the steps of the present invention are as follows:

[0071] 1) Install the graphite-carbon black mixed roll-pressed air cathode into the cathode chamber of an anode-acclimated microbial electrochemical system. The two chambers are separated by a cation exchange membrane to form a double-chamber BES. The cathode chamber is 50mM Na 2 SO 4 Solution, cultivated for two cycles to adapt the anode organisms to the environment.

[0072] 2) Apply a bias voltage of 0.6V between the cathode and anode for 1h, and pump the accumulated H in the cathode chamber 2 o 2 Solution transfer to UV / H 2 o 2 In the reaction vessel, add high-concentration formaldehyde solution dropwise to make the concentrations 6mg / L, 8mg / L, 10mg / L and 20mg / L respectively, adjust the pH of the solution to 3, set the optical path to 2cm and 5cm, turn on the stirrer and Low-p...

Embodiment 3

[0077] Synthesis of H based on microbial electrochemical system 2 o 2 And realize the method for biological heterotopic degradation of formaldehyde, the steps are as follows:

[0078] 1) Install the graphite-carbon black mixed roll-pressed air cathode into the cathode chamber of an anode-acclimated microbial electrochemical system. The two chambers are separated by a cation exchange membrane to form a double-chamber BES. The cathode chamber is 50mM Na 2 SO 4 Solution, cultivated for two cycles to adapt the anode organisms to the environment.

[0079] 2) Apply 0.6V bias voltage 0h, 0.5h, 1.0h and 1.5h between the cathode and anode, and use the pump to transfer the hydrogen peroxide solution accumulated in the cathode chamber for 0h, 0.5h, 1.0h and 1.5h to the UV / h 2 o 2 In the reaction vessel, add high-concentration formaldehyde solution dropwise to make the concentration 6mg / L, adjust the pH of the solution to 3, set the optical path to 2cm, turn on the stirrer and low-p...

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Abstract

The invention discloses a method for biological ex-situ degradation of formaldehyde. A microbial electrochemical / advanced oxidative coupled formaldehyde degradation system is adopted, and the system is composed of a microbial electrochemical system for synthesizing H2O2 and a UV / H2O2 advanced oxidation system. The method comprises the following steps: 1, constructing the microbial electrochemicalsystem for synthesizing H2O2: (1) forming an anode chamber and a cathode chamber which constitute the microbial electrochemical system, and separating the anode chamber and the cathode chamber by a cation exchange membrane; (2) domesticating the anode of the microbial electrochemical system; and (3) using a carbon brush and a graphite-carbon black mixed rolled air cathode to syntehsize H2O2; and 2, constructing the UV / H2O2 advanced oxidation system for degrading formaldehyde. Microorganisms do not need to be in direct contact with formaldehyde pollutants to be treated, so the problem of bioactivity inhibition caused by the toxicity of formaldehyde to the microorganisms in biological in-situ degradation of formaldehyde is avoided.

Description

technical field [0001] The invention relates to the field of degradation of organic pollutants, in particular to a bioelectrochemical system and UV / H 2 o 2 The construction method of the system-coupling reaction system, and the application of realizing bio-ectopic degradation of volatile organic pollutants (taking indoor formaldehyde as an example). Background technique [0002] With the improvement of people's living standards, people's level of interior decoration has gradually improved, and the degree of indoor air pollution has also increased accordingly. According to statistics, the pollution level of indoor air is generally 2-5 times that of outdoor air, and even more than 100 times in some cases. Formaldehyde (CH 2 O), as an important industrial raw material, is widely used in construction, wood processing, furniture, textiles and chemical industries, while formaldehyde is also one of the main indoor air pollutants, which has been classified as a possible cause of ...

Claims

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Application Information

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IPC IPC(8): B01D53/75B01D53/85B01D53/86B01D53/72
CPCB01D53/32B01D53/75B01D53/85B01D53/8668B01D2257/708B01D2258/06Y02A50/20
Inventor 李楠赵倩安敬昆王舒
Owner TIANJIN UNIV
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