Method for controlling and reducing biological treatment of waste water system sludge by special inocula

A technology of sewage treatment system and bacterial agent, applied in the direction of sustainable biological treatment, biological water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of unstable effect and difficult control, and achieve the structure of systemic flora Stable, efficient degradation effect, quick effect

Inactive Publication Date: 2009-08-12
BEIJING NORMAL UNIVERSITY
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  • Method for controlling and reducing biological treatment of waste water system sludge by special inocula
  • Method for controlling and reducing biological treatment of waste water system sludge by special inocula
  • Method for controlling and reducing biological treatment of waste water system sludge by special inocula

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example 1

[0019] Example 1 Adding high-efficiency bacterial agents to control the sludge output of the activated sludge system-direct adding method

[0020] A Sequential Batch Activated Sludge Reactor (SBR) for the treatment of municipal sewage, with an operating cycle of 360min, with various stages including water inflow, aeration, sedimentation, and drainage, with 50 minutes of water inflow, 240 minutes of aeration, and 30 minutes of sedimentation. Drain and leave for 40min. The aeration volume in the aeration stage is 100L / h, and the dissolved oxygen concentration in the reactor is >2mg / L. The reactor drainage ratio is 65%, the MLSS is controlled at about 4000mg / L, the sludge age is controlled at 15-20 days, and the influent COD concentration is 180-600mg / L. In order to reduce the sludge output of the system, 10% special strains were directly added to the system. The cumulative sludge yield in the control stage before the addition of the inoculants is as follows: figure 1 As shown, the ...

example 2

[0022] Example 2 Adding high-efficiency bacterial agents to control the sludge output of the activated sludge system—indirect dosing method

[0023] Pre-contact the special bacterial agent with a certain amount of activated sludge and then add it. This indirect dosing method can promote the maintenance of the high-efficiency bacterial agent in the sewage treatment system and reduce the dosage and frequency of the high-efficiency bacterial agent.

[0024] After mass cultivation of this high-efficiency inoculum, it is collected by centrifugation and washed with phosphate buffer solution. The obtained inoculum is mixed with activated sludge (SVIFigure 4 Shown. The numerical points in the figure are the actual measured values, the dotted line is the average of the sludge yields at different stages, and the vertical dotted line represents the separation before and after inoculation. The average daily sludge yield of the system before inoculation was 0.436mgMLSS / mgCODcr, and 0.336mgMLSS...

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Abstract

The invention discloses a method for controlling and reducing the output of sludge in a biological wastewater treatment system through adding a bacterial agent. The bacterial agent is characterized by high removal efficiency of organic matters and low self growth coefficient. The bacterial agent is directly or indirectly added in a biological wastewater treatment reactor; the addition amount is 5 to 20 percent; and the reduction amount of the sludge can achieve 10 to 30 percent. Compared with the traditional physicochemical method, the sludge reduction method has the advantages of simple operation, low cost, safety and environmental protection, quick curative effect, less influence on the prior system function, etc.

Description

Technical field [0001] The invention relates to a method for controlling and reducing the sludge output of a wastewater biological treatment system through special bacterial agent bioenhancement, and belongs to the field of environmental protection and resource integration—water pollution prevention and control. Background technique [0002] Sludge is an accessory after biological treatment of sewage. In addition to containing a large amount of water, sludge also contains difficult-to-degrade organic matter, heavy metals and salts, as well as a small amount of pathogenic microorganisms and parasite eggs. Therefore, it cannot be directly discharged into the environment. It can be discharged after certain treatment and disposal. With the development of human society, economy and urbanization, the number and scale of sewage treatment plants continue to increase, and the amount of sludge discharge also increases. Controlling and reducing the output of sludge from the source of wastew...

Claims

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Application Information

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IPC IPC(8): C02F3/12C02F3/34
CPCY02W10/10
Inventor 全向春施汉昌孙晓莹
Owner BEIJING NORMAL UNIVERSITY
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