A kind of aerobic granular sludge with high denitrification ability at low temperature, cultivation method and cultivation device

An aerobic granular sludge and culture device technology, applied in chemical instruments and methods, water/sludge/sewage treatment, aerobic and anaerobic process treatment, etc., can solve the problem of short start-up time, effluent dissolved organic nitrogen, Ammonia nitrogen and total nitrogen are not up to standard, aerobic granular sludge is easy to disintegrate, etc., to solve the problems of easy disintegration and short start-up time

Active Publication Date: 2020-05-19
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In view of the problem that the effluent dissolved organic nitrogen, ammonia nitrogen and total nitrogen content of the activated sludge process under low temperature conditions are relatively high and not up to the standard, the present invention provides a cultivation of aerobic granular sludge with high denitrification capacity at low temperature The device, which uses rice husk biochar as the core to form aerobic granular sludge, has both aerobic, anoxic and anaerobic communities, and provides an additional denitrification carbon source by rice husk biochar, which solves the existing Dissolved organic nitrogen, ammonia nitrogen and total nitrogen in the effluent of domestic sewage plants under low temperature conditions are not up to the standard
[0009] The present invention also provides a kind of aerobic granular sludge with high denitrification ability at low temperature, using rice husk biochar as the core, compared with other methods to form aerobic granular sludge, the start-up time is shorter, and it can solve the problem of aerobic granular sludge. Sludge is easy to disintegrate, and rice husk biochar can continuously release volatile fatty acids, providing an additional carbon source for denitrification

Method used

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  • A kind of aerobic granular sludge with high denitrification ability at low temperature, cultivation method and cultivation device
  • A kind of aerobic granular sludge with high denitrification ability at low temperature, cultivation method and cultivation device
  • A kind of aerobic granular sludge with high denitrification ability at low temperature, cultivation method and cultivation device

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Embodiment 1

[0049] A method for culturing aerobic granular sludge with high denitrification capacity at low temperature of the present invention, the specific steps are as follows:

[0050] (a) Inoculated flocculent activated sludge was added to the aerobic granular sludge reactors R1, R2 and R3 at a low temperature of 5 °C, and the sludge concentration was 3000 mg / L. After stirring and aeration, the dissolved oxygen concentration It is 5-6mg / L, so that the inoculated flocculent activated sludge can reach a state of complete mixing;

[0051] (b) Add coconut shell biochar to the first reactor R1, rice husk biochar to the second reactor R2, bamboo biochar to the third reactor R3, coconut shell biochar , the concentration of rice husk biochar and bamboo biochar are both 500mg / L, after 24 hours of stirring and aeration, the reactors R1, R2 and R3 are left to stand;

[0052] The first reactor R1 discharges a small amount of coconut shell biochar suspended on the water surface, and adds an org...

Embodiment 2

[0060] In this example, only the inoculated flocculent activated sludge with a sludge concentration of 4000 mg / L was added to the reactor R4, and the inoculated flocculent activated sludge with a sludge concentration of 4000 mg / L was added to the reactor R5 and 1000mg / L rice husk biochar.

[0061](a) Under low temperature conditions of 15°C, inoculate flocculent activated sludge into reactors R4 and R5, the sludge concentration is 4000mg / L, stir and aerate, and the dissolved oxygen concentration is 5-6mg / L, so that The flocculent activated sludge reaches a state of complete mixing;

[0062] (b) Do not add any biochar to the fourth reactor R4, add 1000mg / L rice husk biochar to the fifth reactor R5, after stirring and aerating for 24 hours, let the reactor R4 stand still and R5;

[0063] Add an organic load of 1.6-2.0kg / (m to the fourth reactor R4 3 D) simulated domestic sewage, after stirring and aerating for 24 hours, let the reactor R4 stand still;

[0064] The fifth reac...

Embodiment 3

[0071] In this example, anaerobic granular activated sludge with a sludge concentration of 4000 mg / L was added to reactor R6, and aerobic activated sludge with a sludge concentration of 4000 mg / L and 700 mg / L were added to reactor R7. Rice husk biochar from L.

[0072] (a) At a low temperature of 10°C, add inoculated anaerobic granular activated sludge to the reactor R6, and add inoculated aerobic activated sludge to the reactor R7. The sludge concentration is 4000 mg / L. Stir and Aeration, the dissolved oxygen concentration is 5-6mg / L, so that the activated sludge can be completely mixed;

[0073] (b) No biochar was added to the sixth reactor R6, and only 700 mg / L rice husk biochar was added to the seventh reactor R7. After 24 hours of stirring and aeration, the reaction was left to stand Devices R6 and R7;

[0074] Add organic load 1.6-2.0kg / (m 3 d) simulated domestic sewage, after stirring and aerating for 24 hours, let the reactor R6 stand still;

[0075] The seventh re...

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Abstract

The invention discloses an aerobic granular sludge having high denitrification capability at a low temperature, and a culture method and a culture device thereof, and belongs to the technical field of environmental engineering. The device comprises an aerobic granular sludge reactor and a water supply unit, a water inlet is arranged at the upper end of the aerobic granular sludge reactor, and the aerobic granular sludge reactor is filled with aerobic granular sludge formed by adopting by rice hull biochar as a core; and the water supply unit includes a water inlet tube, a pump is arranged on the water inlet tube, and the head of the water inlet tube extends into the aerobic granular sludge reactor from the water inlet in order to guide domestic sewage to enter the aerobic granular sludge reactor. The defect of high concentrations of dissolved organic nitrogen, ammonia nitrogen and total nitrogen, caused by poor ammoniation, nitrification and denitrification capacity of active sludge in existing low temperature domestic sewage treatment is made up.

Description

technical field [0001] The invention belongs to the technical field of domestic sewage purification and treatment, in particular to a process for adding rice husk biochar (Biochar) to flocculent activated sludge to form aerobic granular sludge, which strengthens the ability of microorganisms to remove nitrogen at low temperatures, and is mainly suitable for 4 Enhanced denitrification of domestic sewage under low temperature conditions of -15°C, reducing dissolved organic nitrogen, ammonia nitrogen and total nitrogen in the effluent of sewage treatment plants. Background technique [0002] The abundance and activity of nitrogen-removing bacteria (ammonifying bacteria, nitrifying bacteria, and denitrifying bacteria) in activated sludge at low temperature (<15°C) decrease, resulting in a decrease in dissolved organic nitrogen, ammonia nitrogen, and total nitrogen in the low-temperature effluent of sewage treatment plants. concentration rises, and the quality of effluent wate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/30C02F3/12
CPCC02F3/1205C02F3/1236C02F3/301C02F2101/16C02F2101/38C02F2305/06Y02W10/10
Inventor 任洪强何甦丁丽丽
Owner NANJING UNIV
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