Denitrification method using polylactic acid as carbon source and biological film vector

A technology of biofilm carrier and polylactic acid, which is applied in the field of biological denitrification, can solve the problems of excessive liquid carbon source, difficulty in stable operation and maintenance, and high environmental conditions, so as to overcome the difficulty of controlling the dosage of carbon source, The effect of avoiding the risk of secondary pollution and broadening the application field

Inactive Publication Date: 2011-01-26
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

Although these traditional heterotrophic denitrification processes are superior to autotrophic denitrification in terms of investment and operating costs, there are still several difficult problems to solve: first, there is a risk of excessive liquid carbon sources; second, the stability of the system It is difficult to operate and maintain, especially when the nitrate in the influent fluctuates, it is more difficult to control the dosage of carbon sources; third, the requirements for environmental conditions are relatively high, especially for the concentration of dissolved oxygen (DO). limit (<1mg / L)

Method used

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  • Denitrification method using polylactic acid as carbon source and biological film vector
  • Denitrification method using polylactic acid as carbon source and biological film vector
  • Denitrification method using polylactic acid as carbon source and biological film vector

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Effect test

Embodiment 1

[0018] Fill polylactic acid particles with a particle size of about 0.5 cm into a plexiglass reactor with a diameter of 4.5 cm and a height of 45 cm. The filling height is 30 cm, and 100 mL of activated sludge with an inoculation concentration of 3.0 g / L is placed in the reactor.

[0019] Take the groundwater of Changping Campus of Tsinghua University as the treatment object, add NaNO 3 regulate NO 3 -N concentration is 40mg / L. Put this waste water into the water tank (1), and flow into the reactor (3) filled with polylactic acid particles through the metering pump (2), adopt the upflow type water inlet, the DO concentration of dissolved oxygen is 1mg / L, and the hydraulic retention time is 2h Under the condition of 25℃, the denitrifying microorganisms were cultured for 7 days until the effluent quality was stable. The nitrate in the raw water was reduced to nitrogen under the action of the denitrifying microorganisms in the biofilm, and passed through the exhaust port (4 ) i...

Embodiment 2

[0025] Fill polylactic acid particles with a particle size of about 0.4 cm into a plexiglass reactor with a diameter of 4.5 cm and a height of 45 cm, and the filling height is 30 cm.

[0026] Take the groundwater of Changping Campus of Tsinghua University as the treatment object, add NaNO 3 regulate NO 3 -N concentration was 100 mg / L. Put this waste water in the water tank (1), and inoculate the activated sludge 100mL of 3.0g / L in the water tank, and the mixture of waste water and activated sludge flows into the reactor filled with polylactic acid particles through the metering pump (2) In (3), adopt upflow type water inflow, DO concentration of dissolved oxygen is 5mg / L, under the conditions of hydraulic retention time of 3h and temperature of 30°C, denitrifying microorganisms are cultured for 5 days until the quality of the effluent is stable, and the raw water Nitrate in the biofilm is reduced to nitrogen under the action of denitrifying microorganisms in the biofilm, dis...

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Abstract

The invention discloses a method for denitrification by utilizing polylactic acid as a carbon source and a biofilm carrier, and belongs to the technical field of environmental protection. In the method, the biodegradable polylactic acid is simultaneously used as the carbon source and the biofilm carrier of denitrifying microorganism, thereby overcoming the defect of difficult control of adding amount of the carbon source existing in the prior denitrification process, having stronger applicability on dissolved oxygen concentration of inlet water and simultaneously lowering cost of biological denitrification; and the removing rate of the nitrate reaches more than 90 percent. The method can be used to remove the nitrate in surface water, ground water and waste water.

Description

technical field [0001] The invention relates to a biological denitrification method, in particular to a denitrification method using polylactic acid as a carbon source and a biofilm carrier. Background technique [0002] In recent years, the concentration of nitrate in water has been continuously increasing, which has become a prominent problem of water pollution in the world. In addition to causing eutrophication of water bodies, nitrate will also become nitrite through the action of nitrate-reducing bacteria in the body, thus posing a threat to health, such as causing methemoglobinemia in infants and young children, and "carcinogenic and teratogenic". , Mutagenesis" three effects. my country's latest "Drinking Water Sanitation Standard" (GB5749-2006) adjusts the upper limit of nitrate nitrogen from the original 20mg / L to 10mg / L. [0003] At present, there are two types of nitrate removal methods in water: physical chemical method and biological denitrification method. I...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/12C02F3/10
CPCY02W10/10
Inventor 王建龙范振兴胡俊
Owner TSINGHUA UNIV
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