Device and method for residual sludge fermentation coupled AO biological denitrogenation

A technology for excess sludge and biological denitrification, applied in biological treatment devices, chemical instruments and methods, sludge treatment, etc., can solve the problems of difficult disposal of excess sludge, insufficient carbon source in influent water, and low C/N. , to solve the problem of treatment and disposal, efficient recovery, and reduce the cost of treatment

Active Publication Date: 2015-03-11
BEIJING UNIV OF TECH
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Problems solved by technology

[0004] Aiming at the problems of insufficient carbon source in the water of the AO denitrification device, low C / N ratio, and difficult treatment and disposal of excess sludge, the present invention proposes a device and method for coupling AO biological denitrification with excess sludge fermentation

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  • Device and method for residual sludge fermentation coupled AO biological denitrogenation

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Embodiment example

[0024] Each reactor is made of plexiglass, the effective volume of the fermentation device is 20L, and the effective volume of the AO device is 45L; the test water is domestic sewage from the family area of ​​Beijing University of Technology, and its specific indicators are: SCOD=120-180mg / L , NH 4 + -N=50-60mg / L, NO 2 - -N≤0.5mg / L, NO 3 - -N≤0.5mg / L.

[0025] The specific operation is as follows:

[0026] 1 Start-up stage: inoculate the biological denitrification sludge into the AO biological denitrification reactor, control the system sludge concentration at 3000-3500mg / L, the reactor temperature at 25-35°C, the volume of the anoxic section and aerobic section of the AO system ratio, that is, V 缺 :V 好 =1:2, C / N in the control system=4-5, DO in the aerobic section=3-3.5mg / L, HRT=15h, SRT=15d. Take the remaining sludge from the pilot scale SBR as the start-up sludge of the sludge fermentation plant. The indicators of the remaining sludge after elutriation are as follo...

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Abstract

Belonging to the technical field of recovery of low C / N sewage treatment, sludge reduction and nitrogen and phosphorus recovery, the invention relates to a device and method for residual sludge fermentation coupled AO biological denitrogenation. The method comprises an AO apparatus, a secondary sedimentation tank, a mud storage box, a fermentation apparatus, a fermentation liquid separation tank, a nitrogen and phosphorus removal tank, and a raw water tank. The method includes: subjecting the residual sludge to anaerobic fermentation in a fermentation apparatus to produce acid, conducting nitrogen and phosphorus removal on the generated fermentation liquor, then using the fermentation liquor as an external carbon source of AO apparatus feedwater to improve the C / N of the AO system feedwater; subjecting the AO apparatus feedwater firstly to denitrification by an anoxic zone, then conducting nitrification by an aerobic zone to remove nitrogen in domestic sewage, discharging the residual sludge of the AO apparatus directly into the fermentation apparatus to produce acid by fermentation so as to reduce the sludge discharge of the AO apparatus, and simultaneously adopting a struvite technique to recover nitrogen and phosphorus in a nitrogen and phosphorus apparatus.

Description

Technical field: [0001] The invention relates to a device and method for coupling residual sludge fermentation with AO biological denitrification, and belongs to the technical field of low C / N sewage treatment, sludge reduction and nitrogen and phosphorus recovery. The excess sludge is produced by anaerobic fermentation under the action of hydrolytic acidification bacteria, and the fermentation liquid is provided as a carbon source for the AO biological denitrification system to improve the C / N of the system and improve the denitrification effect of the system; The purpose of sludge reduction is achieved under the action of bacteria; at the same time, appropriate magnesium salt and phosphorus salt are added, and ammonia nitrogen and phosphorus are recovered by struvite method. Background technique: [0002] The AO biological denitrification process is a simple and practical biological denitrification technology widely used in sewage treatment plants. It has the advantages of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/04C02F11/00C02F9/14
CPCC02F3/308C02F11/00C02F11/04C02F2103/002C02F2103/005C02F2203/004C02F2303/06
Inventor 彭永臻邢立群金宝丹何岳兰王淑莹
Owner BEIJING UNIV OF TECH
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