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Culture method of aerobic denitrification particle sludge

A technology of anaerobic granular sludge and nitrifying granular sludge is applied in the cultivation field of aerobic denitrifying granular sludge, which can solve the problems of low reactor efficiency, high investment and operation cost, low sludge concentration, etc. The effect of reducing pollution and high microbial biomass

Inactive Publication Date: 2010-12-29
DONGGUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for cultivating aerobic denitrification granular sludge in view of the deficiencies in the prior art, which can solve the problems of low sludge concentration and reactor efficiency in the traditional nitrification and denitrification biological denitrification process. Low investment and high operating costs, etc., and effectively reduce the pollution of water bodies caused by nitrate and nitrite wastewater in industries such as chemical fertilizers and aquaculture

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Mix the anaerobic granular sludge in the UASB (Up-flow Anaerobic Sludge Bed) reactor for starch wastewater treatment with the aerobic flocculent sludge for urban sewage treatment in a mass ratio of 4:1 , and then inoculate the mixed sludge into the upflow aerobic sludge bed reactor. The total nitrate concentration of artificially configured simulated wastewater is 300mg / L, the molar ratio of nitrite to nitrate is 2:1, the operating conditions of the reactor are: temperature 25-35°C, pH value between 6.4-7.8, dissolved Oxygen is 3-6mg / L, hydraulic retention time is 6-10 hours, air aeration is used, and the air rate is 20-30L / h. After 72 days of stable operation, brown aerobic denitrification granular sludge is observed in the reactor . Its particle size is 0.7~1.1mm, and its density is 1.01~1.28g / cm 3 , The removal rate of total nitrate nitrogen was 77%.

Embodiment 2

[0018] Adopt the inoculation sludge identical with embodiment 1, in the cultivation process, the total nitrate concentration of influent is gradually increased to 300mg / L by 30mg / L, every 3 days improves once influent load, improves 30mg / L each time, other conditions and Same as Example 1, after 65 days of stable operation, brown aerobic denitrification granular sludge was observed in the reactor, with a particle size of 0.8-1.2mm and a density of about 1.15g / cm 3 , The removal rate of total nitrate nitrogen was 83%.

Embodiment 3

[0020] The activated sludge from the sewage treatment system of a slaughterhouse was used to inoculate into the upflow aerobic reactor, and the total nitrate concentration of simulated wastewater was artificially configured to be 400 mg / L, and the molar ratio of nitrite to nitrate was 1:2. The air velocity of the reactor is 30-45L / h, and other conditions are the same as in Example 1. After 89 consecutive days, aerobic denitrification granular sludge appears in the reactor, with a particle size of 2.8-3.5mm and a density of about 1.25g / cm 3 , The removal rate of total nitrate nitrogen is 85%.

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Abstract

The invention relates to the technical field of a culture method of particle sludge in a biological treatment technology of waste water, in particular to a culture method of aerobic denitrification particle sludge. The method comprises the following steps: putting inoculated activated sludge into an upflow-type aerobic sludge bed reactor; pumping in waste water containing nitrite and nitrate and organic matters from the bottom of the reactor; ensuring that the waste water flows out of the upper part of the reactor after passing through the reactor; and meanwhile, adopting air aeration, obtaining favourable aerobic denitrification particle sludge after the materials are cultured for 35-120 days. The aerobic denitrification particle sludge obtained by the method has good performance, and the volume loading, the removal efficiency and the operation stability of the reactor can be improved.

Description

Technical field: [0001] The invention relates to the technical field of a method for cultivating granular sludge in wastewater biological treatment technology, in particular to a method for cultivating aerobic denitrification granular sludge. Background technique: [0002] In recent years, water pollution has become more and more serious. Excessive nitrogen-containing pollutants have entered natural water bodies, which not only deteriorates the quality of the water environment, affects the development of fisheries, tourism, and aquaculture, but also affects human health and the survival of animals and plants. serious hazard. All countries have started research on wastewater treatment, among which, the use of biological technology to treat wastewater has attracted more and more attention, and wastewater biological denitrification technology has attracted widespread attention from all over the world. [0003] The traditional biological denitrification technology includes two ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/30
Inventor 徐勇军谢磊杨晓西刘治猛
Owner DONGGUAN UNIV OF TECH
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