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Filamentous sludge bulking recovery method based on non-nitrification A/O (anaerobic/aerobic) biological phosphorus removal process

A technology of sludge bulking and recovery method, which is applied in the direction of aerobic and anaerobic process treatment, can solve the problems of filamentous bacteria sludge bulking, etc., achieve short recovery period, eliminate the symptoms but not the root cause, and solve the problem of filamentous bacteria sludge The effect of swelling

Inactive Publication Date: 2012-08-01
BEIJING UNIV OF TECH
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  • Claims
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AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of filamentous bacteria sludge swelling caused by specific factors in the existing urban sewage treatment, based on the dual-substrate control principle of load and dissolved oxygen, and provide a kind of non-nitrification biological phosphorus removal A under normal temperature urban sewage conditions / O Process Filamentous Bacteria Sludge Bulking Recovery Method

Method used

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  • Filamentous sludge bulking recovery method based on non-nitrification A/O (anaerobic/aerobic) biological phosphorus removal process
  • Filamentous sludge bulking recovery method based on non-nitrification A/O (anaerobic/aerobic) biological phosphorus removal process
  • Filamentous sludge bulking recovery method based on non-nitrification A/O (anaerobic/aerobic) biological phosphorus removal process

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Experimental program
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Effect test

Embodiment 1

[0028] Example 1 see figure 2 ,

[0029] During the early operation of the system, the aerobic section adopts the aeration method of the perforated aeration tube at the bottom. The indoor air pressure fluctuated greatly, which made it difficult to control the DO of the system, which led to the occurrence of sludge bulking. The SVI reached 326.74mL / g, which was confirmed to be filamentous bacteria sludge bulking by microscope inspection. In addition, the system has been operating at a high level of load (0.7-0.98kgCOD / kgMLSS / d), which made the sludge properties deteriorate for a while, and the SVI value reached 569.8mL / g, which has seriously affected the normal operation of the system.

[0030] Carry out recovery test according to the method described in the present invention. First of all, the equipment has been modified, adding decompression and stabilizing equipment at the main indoor intake pipe, and adding two perforated partitions in the aerobic section to divide the a...

Embodiment 2

[0033] Example 2 see image 3 ,

[0034] When the reactor operated to the 79th day, the system sludge leaked due to the failure of the return pump, and the reactor sludge lost nearly 60%. The system operates at high load, with a load value as high as 1.54kgCOD / kgMLSS / d, during which DO is controlled at 1.5mg / L. When the system was impacted by high load, the sludge properties deteriorated rapidly in just 3 days, and the SVI once reached 425mL / g.

[0035] Then take regulation and control measure in time, according to operating parameter described in the present invention, by the regulation and control method of step 1, after regulation and control 8 days, SVI value promptly drops to 250mL / g, thinks that the first stage filamentous bacteria is eliminated successfully. Then, according to the control method of step 2, after 10 days of second-stage operation, the system SVI value was basically stable at about 120mL / g on the 100th day, and the sludge properties were good. In the su...

Embodiment 3

[0036] Embodiment 3 see Figure 4 ,

[0037] When filamentous bacteria expansion occurs in the system, take the length, width and height as 0.5 times the original pilot test level (other parameters are exactly the same as the pilot test) to do A / O small test synchronization test verification, and the operating parameters of the small test equipment are the same as the pilot test.

[0038] According to the operating parameters of the present invention, according to the control method of step 1, after 13 days of control, the SVI value dropped to 227.3mL / g, and it was considered that the first stage of filamentous bacteria was successfully eliminated. Afterwards, according to the control method of step 2, after 10 days of second-stage operation, the system SVI value was basically stable at about 120mL / g on the 50th day, and the sludge properties were good. In the subsequent operation, there has been no sludge bulking The phenomenon. From Figure 4 It can be seen that the SVI v...

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Abstract

The invention relates to a filamentous sludge bulking recovery method based on a non-nitrification A / O (anaerobic / aerobic) biological phosphorus removal process, and belongs to the field of urban domestic sewage treatment and regeneration. In virtue of an A / O biological phosphorus removal reactor, filamentous bulking is recovered in two stages, and the filamentous sludge bulking recovery method comprises the following steps: firstly keeping load at 0.40-0.50kg COD (chemical oxygen demand) / kg MLSS (mixed liquor suspended solid) / d, regulating reflux ratio to 75%-85%, controlling the aeration of an aerobic stage to form DO (dissolved oxygen) gradient aeration of 1.4mg / L-1.6mg / L, 0.9mg / L-1.0mg / L and 0.9mg / L-1.0 mg / L to eliminate filamentous fungi, reducing the reflux ratio to 45%-55% when an SVI (sludge volume index) value is reduced into the range of 180mL / g-250mL / g, and reducing the aeration to form the DO gradient of 0.9mg / L-1.1mg / L, 0.4mg / L-0.6mg / L and 0.4mg / L-0.6mg / L. Under the operation parameter conditions, the filamentous bulking caused by the DO and high-load impact (1.54kg COD / kg MLSS / d) can be recovered rapidly, the SVI is reduced from 569.8mL / g to below 150mL / g, and the recovery time of bulking of the lighter filamentous fungi is shorter.

Description

technical field [0001] The invention belongs to the field of urban domestic sewage treatment and regeneration. In particular, the invention relates to a recovery method for sludge bulking of filamentous fungus in the non-nitrification anaerobic / aerobic (A / O) biological phosphorus removal process of urban domestic sewage under normal temperature conditions. Background technique [0002] Activated sludge method is the most commonly used method in sewage biological treatment. Sludge bulking is the most difficult problem that often plagues people during the operation of activated sludge sewage treatment plants. Most of the urban sewage treatment plants in my country occur every year. Activated sludge bulking, there is a problem of activated sludge bulking in all types of activated sludge processes. Severe sludge bulking not only causes sludge loss, but also increases suspended solids in the effluent, which greatly reduces the processing capacity of the system. , and once activate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/30
Inventor 李冬马金明曾辉平张杰
Owner BEIJING UNIV OF TECH
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