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Method for converting active sludge into autotrophic denitrified sludge based on mixed type continuous flow reactor

An activated sludge and autotrophic denitrification technology, applied in the field of sewage denitrification process treatment, can solve the problems of long cycle, complicated start-up process, unclear operation parameters, etc., to achieve good versatility and promotion space, simple and cheap equipment , The effect of stable long-term operation

Inactive Publication Date: 2011-07-06
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has wide application value, and mainly solves the problems of difficult selection of inoculum sludge for autotrophic denitrification process, complicated start-up process, long cycle and unclear operating parameters.

Method used

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  • Method for converting active sludge into autotrophic denitrified sludge based on mixed type continuous flow reactor
  • Method for converting active sludge into autotrophic denitrified sludge based on mixed type continuous flow reactor
  • Method for converting active sludge into autotrophic denitrified sludge based on mixed type continuous flow reactor

Examples

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Effect test

Embodiment 1

[0028] Use anaerobic sludge as seed sludge to feed the continuous flow reactor, (1) Preparation stage: sludge stabilization period, the purpose is to stabilize the sludge by aeration and remove organic matter and impurities. Add sludge into the denitrification reactor, add municipal sewage, the ratio of sludge to water is 1:5, fully aerate for 24 hours, continue to stir, run in batch mode for 1 day, and then drain 80%. (2) The first stage: add sodium bicarbonate buffer, mix at a ratio of 4g per liter of water, and maintain a pH value of 7.5-8.0 during the acclimation period; blast aeration, control DO at 1-0.5mg / L, stir and mix completely, Continuous drainage, VSS guaranteed at 1.5g / L or above, hydraulic retention time 1 week. At the same time, increase the concentration of ammonia nitrogen in the influent water every week, starting from 50mg / L to 100mg / L; The accumulation rate of nitrite is 70-80% or above, the removal rate of ammonia nitrogen is 80% or above, and the remova...

Embodiment 2

[0030] Use anoxic sludge as seed sludge to feed the continuous flow reactor, (1) Preparation stage: sludge stabilization period, the purpose is to stabilize the sludge through aeration and remove organic matter and impurities. Add sludge into the denitrification reactor, add municipal sewage, the ratio of sludge to water is 1:4, fully aerate for 36 hours, continue to stir, run in batch mode for 2 days, and then drain 75%. (2) The first stage: maintain the pH value of 7.8-8.0 during the acclimation period; blast aeration, DO control at 0.6mg / L, complete stirring and mixing, continuous drainage, and hydraulic retention time of 6 days. At the same time, increase the concentration of ammonia nitrogen in the influent water every 6 days, starting from 50mg / L to 100mg / L-200mg / L, and increase the ammonia nitrogen concentration in the influent water to 200-400mg / L after one month. The accumulation rate of nitrite is 80% or above, the removal rate of ammonia nitrogen is 90% or above, an...

Embodiment 3

[0032] Use the return sludge of the secondary settling tank as the seed sludge to feed the continuous flow reactor, (1) preparation stage: as above; (2) the first stage as above;: maintain the pH value of 7.8-8.0 during the water intake; Wind aeration, DO control at 1mg / L, complete mixing, continuous drainage, hydraulic retention time 7 days. At the same time, increase the concentration of ammonia nitrogen in the influent water every day, starting from 50mg / L to 100mg / L-200mg / L, and increase the ammonia nitrogen concentration in the influent water to 200-400mg / L after one month. The accumulation rate of nitrite is 80% or above, the removal rate of ammonia nitrogen is 90% or above, the removal rate of total nitrogen is 20%-25%, and the VSS is guaranteed to be 1.5g / L or above. Reach the 80th day and then enter the second stage of cultivation. (3) The second stage: add sodium bicarbonate buffer, mix at a ratio of 4g per liter of water, and maintain a pH value of 7.8-8.0 during a...

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Abstract

The invention belongs to the treatment field of waste water, and provides a method for converting active sludge into autotrophic denitrified sludge based on a mixed type continuous flow reactor. The method which is used for converting the common active sludge into the autotrophic denitrified sludge by the continuous flow reactor specifically comprises two stages. The first stage comprises the steps of: converting anaerobic or anoxic sludge into a nitrosation status by the condition which controls the organic matter concentration (COD (chemical oxygen demand) is less than 20mg / L), the water dissolved oxygen concentration (1-0.5mg / L), and the inflowing ammonia nitrogen concentration (50-450mg / L), and restraining the growth of the other microorganisms step by step by the running condition and the washing characteristic of the continuous flow reactor. When the cumulative percentage of the nitrite is more than 60%, the second stage is started. The second stage comprises the step of: promoting the nitrosation status to be converted into the autotrophic denitrification status by the condition which improves the ammonia nitrogen concentration (450-550mg / L), reduces the dissolved oxygen (0.5mg / L), and keeps a certain PH value (7.5-8.0) to form a system which is coupled nitrosified microorganism to anammox microorganism. The practice proves that the system can stably run for a long term. After entering into the practical running stage of the waste water treatment, the method leads the ammonia nitrogen removing rate and the total nitrogen removing rate to be respectively more than 80% and 70% by the reaction which is remained only by the natural reoxygenation or a small quantity of aeration without aeration.

Description

technical field [0001] The invention belongs to the field of sewage treatment and relates to a novel high-efficiency and energy-saving sewage denitrification process technology. Background technique [0002] There are a large number of nitrogen-containing pollutants in modern industrial and domestic sewage, which are finally transformed into ammonia nitrogen, nitrite nitrogen and nitrate nitrogen in water under the chemical and biological effects of water. A large amount of nitrogen in water will lead to the increase of total nitrogen in water, induce eutrophication of water body, poison humans and other organisms, and seriously pollute the environment. At present, the traditional biological denitrification technology has the disadvantages of high energy consumption and the need for additional organic carbon sources, and cannot cope with the increasingly serious water pollution problem. With the development of research and technology, new high-efficiency and energy-saving a...

Claims

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Application Information

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IPC IPC(8): C02F3/30
Inventor 贾晓珊钟玉鸣张再利
Owner SUN YAT SEN UNIV
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