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Method for improving precipitation performance of filamentous bulking sludge

A technology of bulking sludge and filamentous bacteria, applied in chemical instruments and methods, biological water/sewage treatment, water/sludge/sewage treatment, etc. The effect of improving sedimentation performance and effluent quality

Inactive Publication Date: 2013-04-03
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The problem to be solved by the present invention is to provide a method for improving the sedimentation performance of filamentous bacteria bulking sludge, which can make the filamentous bacteria that cause sludge bulking adhere to, entangle and grow, and change its divergent growth mode, so that The dense growth of filamentous bacteria solves the problem of difficult separation of solid and liquid, thereby improving the quality of sewage treatment effluent

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  • Method for improving precipitation performance of filamentous bulking sludge
  • Method for improving precipitation performance of filamentous bulking sludge
  • Method for improving precipitation performance of filamentous bulking sludge

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Embodiment 1

[0024] A sewage treatment plant has a daily sewage treatment capacity of 100,000 m 3 / d, assume about 3km in the area 2 For the sewage treatment work in the area, the plant adopts the improved sequencing batch activated sludge method (SBR method). Design influent water quality BOD 5 180mg / L, CODcr 360mg / L, SS 250mg / L; effluent water quality BOD 5 30mg / L, CODcr 100mg / L, SS 30mg / L. During operation, sludge bulking occurred in some biological pools, and the SVI value increased significantly, and its value was around 200mL / g; the concentration of active sludge MLSS also decreased significantly, from 2500mg / L under normal conditions to 1000mg / L; Observing the sludge under a microscope, all the sludge flocs had a higher abundance of filamentous bacteria, forming a network.

[0025] The specific steps of the method for improving the sedimentation performance of filamentous bacteria bulking sludge in the present invention are as follows:

[0026] ①Crush the organic matter (corn),...

Embodiment 2

[0034] The design treatment capacity of a sewage treatment plant is 10,000 m 3 / d, the water quality is mainly domestic sewage, and contains a small amount of industrial wastewater. The sewage treatment plant adopts the oxidation ditch process. The main design parameters: the hydraulic retention time is 22.56h, the sludge age is 22.76d, the sludge load is 0.06kgBOD / (kgMLSS·d), and the settling time is 2.5h. Sludge bulking occurred during the operation of the sewage plant. During the sludge bulking, the sludge in the aeration tank turned black, the SV was as high as 98%, and the peak value of SVI reached 800mL / g. Microscopic examination found that a large number of filamentous bacteria protruded from the bacterial micelles , the quality of effluent water deteriorates.

[0035] The specific steps of the method for improving the sedimentation performance of filamentous bacteria bulking sludge in the present invention are as follows:

[0036] ① The organic matter (rice) is crush...

Embodiment 3

[0042] A sewage treatment plant in a city in northern my country, the design load is 0.24kgBOD / (kgMLSS·d), BOD 5 200-300mg / L, design flow 30,000m 3 / d, the aeration time is 8h, the sedimentation time of the secondary sedimentation tank is 2.5h, and the plug-flow operation is adopted. The actual operating load is only about 0.1kgBOD / kgMLSS·d, and the actual flow rate is 17,000m 3 / d. Since it was put into operation, swelling has occurred in winter and spring. Microscopic observation of the swelling sludge and Gram and Nessler staining tests have proved that the sludge swelling is caused by microthrix prricella of the genus Microthrix.

[0043] The specific steps of the method for improving the sedimentation performance of filamentous bacteria bulking sludge in the present invention are as follows:

[0044] ① The organic matter (wheat) is crushed, sieved with a sieve, and the wheat with a particle size of 0.2 mm is screened out;

[0045] ②The concentration of activated sludg...

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Abstract

The invention discloses a method for improving precipitation performance of filamentous bulking sludge. The method comprises the steps of 1), crushing and screening organics, such as corn, wheat, sorghum and rice; 2), measuring the concentration of activated sludge in a biological reaction tank such as an aeration tank and a precipitation tank, and quantifying filamentous bacteria for the bulking sludge; 3), putting into the filamentous bulking sludge according to the weight ratio for preparing the screened organics per gram of the sludge or the weight ratio for preparing the organics per meter of the length of each filamentous bacterium; 4), keeping other conditions in the biological reaction tank unchanged, and increasing stirring; and 5), measuring the MLSS (mixed liquor suspended solid) value and the SVI (sludge volume index) value in the biological reaction tank, so that the improvement of the precipitation performance of the filamentous bulking sludge is achieved. The method can enable the filamentous bacteria causing sludge bulking to grow in adhering and twining manners and change a spreading growing manner of the filamentous bacteria, so that the filamentous bacteria grow densely, the problem that solids and liquid are hard to separate is solved, and the effluent quality of sewage treatment is improved.

Description

technical field [0001] The invention relates to a method for improving the sedimentation performance of filamentous bacteria bulking sludge, in particular to a method for making filamentous bacteria adhere and entangle to grow, so as to improve the sedimentation performance of filamentous bacteria bulking sludge. Background technique [0002] Activated sludge method has been widely used in sewage treatment, but sludge bulking is one of the common and thorny problems since the method came out. Sludge bulking makes it difficult to separate muddy water, and the quality of effluent water deteriorates. In severe cases, it will lead to the paralysis of the entire sewage system. Sludge bulking is divided into filamentous bacterial bulking and non-filamentous bulky bulking, of which the former accounts for 90%. The traditional technical control method is to control the expansion of filamentous bacteria by killing or inhibiting the growth of filamentous bacteria. Common measures inc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/12
CPCY02W10/10
Inventor 李志华莫丹丹
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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