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Method of biological treatment for organic sewage and apparatus therefor

A technology for biological treatment and sewage, applied in sustainable biological treatment, biological water/sewage treatment, water/sludge/sewage treatment, etc. Mud settlement and concentration, sand sedimentation and accumulation at the bottom of the aeration tank, etc., to achieve the effect of easy increase of BOD concentration, easy increase, and easy sewage water volume

Inactive Publication Date: 2008-06-18
NET SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in this physical and chemical technology, the method of adding inorganic mineral particles such as sand to the aeration tank is prone to problems such as sedimentation and accumulation of sand particles at the bottom of the aeration tank
In addition, since sand is discharged out of the system together with excess sludge, there is a disadvantage that sand must be replenished.
On the other hand, the method of adding a polymer coagulant or ozone treatment has the following disadvantages, that is, the cost of adding a polymer coagulant or the cost of ozone generation is high
And these treatment methods are not technologies that can substantially improve the settling and concentration properties of floating sludge itself
So far, there is no known biological technique that can reliably prevent swelling

Method used

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  • Method of biological treatment for organic sewage and apparatus therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] [Discussion on the appropriate ratio of (volume of microbial adhesion material) / (total volume of aeration tank)]

[0049] An appropriate ratio of (volume of microorganism-attached material) / (total volume of aeration tank), that is, a ratio necessary for obtaining the effect of improving the settleability of activated sludge, was investigated using a laboratory-scale apparatus. The details are described below.

[0050] The shaking bed "Biofringe" manufactured by NET Co., Ltd. is set to a length of 40 cm, and many "Biofringe" are closely installed in the formwork of various volumes shown in Table 1 in a manner that there is basically no interval between each other, thereby preparing Good volume of various microbial attachment materials. In addition, a plurality of aeration tanks (20 cm in length, 50 cm in width, and 50 cm in water depth) with an effective volume of 50 liters were fabricated, and various microorganism-adhering materials of different volumes were immersed ...

Embodiment 2

[0057] [Discussion on appropriate conditions for BOD volume loading of microorganism-attached materials]

[0058] Appropriate conditions for the BOD volumetric loading of microorganism-attached materials were investigated using a laboratory-scale device.

[0059] The aeration tank (volume 50 liters) and sedimentation tank used in the test of Example 1 were used. The aeration tank was filled with a "Biofringe" type microorganism attachment material having the same constitution as in Example 1 but having a volume of 20 liters. For comparison, the test was also carried out without filling with the microorganism attachment material. Then, by changing the amount of raw water treatment, various changes are made to the BOD volume load of the microorganism-attached material. Raw water adopts the BOD used in embodiment 1 as the corn steep liquor dilution water of 1000mg / L.

[0060] Table 2 shows the test results. As shown in Table 2, the BOD volume load of the microbial attachment ...

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Abstract

A method of biological treatment for organic sewage. An aeration tank for performing of active sludge treatment is partitioned into a raw water inflow part and a part understream of the raw water inflow part. A material having a microorganism attached thereto is immersed in the raw water inflow part, and the BOD volume load on the material having a microorganism attached thereto is set for 1 kg / (m3day) or more.

Description

technical field [0001] The invention relates to a biological treatment method and device for organic sewage. Background technique [0002] As a typical treatment method for biologically treating factory effluent, sewage, etc., the activated sludge treatment method is widely practiced. In those activated sludge treatment facilities equipped with an aeration tank, a settling tank, etc. for this purpose, the characteristics of the sludge have a great influence on the water treatment function and treatment cost. In addition, in order to maintain good treated water quality, it is very important to maintain good sludge settleability. [0003] However, it is well known that activated sludge has little settleability and concentration. Therefore, in the known activated sludge treatment method, it is difficult to maintain the concentration of MLSS (Mixed LiquorSuspended Solids, total suspended solids in the mixed liquid) in the aeration tank at a high concentration, and there is the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/06C02F3/10C02F3/12
CPCC02F3/06Y02W10/10
Inventor 小山登一郎
Owner NET SA
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