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Operating method for air diffusion apparatus

An operation method and air device technology, which is applied in the field of air diffuser, can solve the problems of blocking air diffuser holes, not easy to peel off sludge, heavy load, etc., and achieve the effect of preventing drying and consolidation

Inactive Publication Date: 2013-12-18
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If a large amount of sludge flows into the air supply pipe in this way, there will be the following problems: when the air is diffused next, a large load will be applied to the blower, and a large amount of sludge will adhere to and dry in the air supply pipe, and they will be removed. Send to the diffuser pipe, block the diffuser hole
[0015] In addition, in the method of discharging sludge only from the opening below the diffuser pipe as described in Patent Document 3, it is not easy to peel off the sludge firmly attached to the periphery of the diffuser hole.
Therefore, in the end, it is necessary to use the cleaning method of intermittently supplying water to the diffuser pipe together, and the equipment installation cost for supplying water is required.

Method used

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  • Operating method for air diffusion apparatus
  • Operating method for air diffusion apparatus
  • Operating method for air diffusion apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0152] exist figure 1 Water treatment is carried out in the sewage treatment plant of the structure.

[0153] As the membrane module 13 for solid-liquid separation, SteraporeSADF (trade name, manufactured by Mitsubishi Rayon Engineering Co., Ltd., hollow fiber membrane made of polyvinylidene fluoride) was used. The activated sludge 11 of the water to be treated adopts activated sludge with an MLSS concentration of about 9500mg / L.

[0154] What diffuser pipe 21 uses is inner diameter d 1 200mm (0.02m) and a length of 650mm vinyl chloride resin round pipes are formed at equal intervals on the vertical upper part of the diffuser pipe 21 (the vertical line intersecting the axis of the diffuser pipe) with a diameter of φ5mm (0.005m). ) of the diffuser holes 23. The gradient of the axial direction of the diffuser pipe is within 1 / 100. In addition, in figure 1 Although there are six diffuser holes 23 shown in the figure, in the first embodiment, five holes are formed.

[0155] ...

Embodiment 2

[0162] A water treatment test was implemented under the same conditions as in Example 1 except that thirteen air diffusion holes 23 having a diameter of φ4 mm (0.004 m) were formed.

[0163] Using the above values, the pressure head ΔH in the pipe calculated by the formula (I) is 6mm (0.006m), which is the inner diameter d of the diffuser pipe 21 1 The value of 0.6 times of is within the preferred range of the present invention.

[0164] As a result of the water treatment test continued for 30 days, it was confirmed that all the 13 diffuser holes 23 on the diffuser pipe 21 were not blocked by the activated sludge 11 .

[0165] Although a little sludge adhered to the inner wall of the diffuser pipe 21 , it was confirmed that the sludge inlet and outlet holes 24 were not blocked by the activated sludge 11 .

[0166] In addition, during the test period of 30 days, it was confirmed that the activated sludge 11 did not adhere to the membrane module 13 for solid-liquid separation, ...

Embodiment 3

[0168] Except that the flow rate Q of the diffused gas supplied to each diffused tube is 50L / min (8.3×10 -4 m 3 / sec), all the water treatment tests were implemented under the same conditions as in Example 1.

[0169] Using the above values, the pressure head ΔH in the pipe calculated by the formula (I) is 12mm (0.012m), which is the inner diameter d of the diffuser pipe 21 1 The value of 0.6 times of is within the preferred range of the present invention.

[0170] As a result of the 30-day water treatment test, it was confirmed that the five diffuser holes 23 on the diffuser pipe 21 were not blocked by the activated sludge 11 , and the sludge inlet and outlet holes 24 were also confirmed not to be blocked by the activated sludge 11 . In addition, during the test period of 30 days, it was confirmed that the activated sludge 11 did not adhere to the membrane module 13 for solid-liquid separation, and stable membrane filtration could be continued.

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Abstract

The present invention provides an operating method for an air diffusion apparatus provided with: an air diffusing unit being disposed within an activated sludge aeration tank, said air diffusing unit spurting an air for diffusion; and an air supply unit for supplying the air for diffusion to the air diffusing unit. The air diffusing unit is configured to have one or more air diffusing tubes disposed almost horizontally. On a vertically upper section of the diffusing tube, a plurality of diffusion holes are formed, and on a lower section thereof, one or more sludge passage holes are formed. This operating method for an air diffusion apparatus repeatedly performs: a supplying step, where the air for diffusion is supplied from the air supply unit to the air diffusing unit so that a water pressure head ([delta]H) for each diffusing tube, calculated by formula (I), has a value 0.2-0.9 times the inner diameter (d1) of the diffusing tubes, and the air for diffusion is supplied from the air supply unit to the air diffusing unit; and a stopping step where supply of the air for diffusion is stopped without exposing the air in the diffusing tubes to the atmosphere.

Description

technical field [0001] The invention relates to an operation method of an aeration device used for aeration in an activated sludge aeration tank. Background technique [0002] Conventionally, activated sludge is treated by disposing an air diffuser pipe having a plurality of air diffuser holes formed therein in an activated sludge aeration tank, and spraying air or other gas for air diffusion into the tank. [0003] In such activated sludge treatment, as the treatment continues, the activated sludge dries and solidifies in the air diffuser pipe, accumulates around the air diffuser holes, and the air diffuser holes are clogged, resulting in unstable air diffusion. [0004] As a method of solving such a problem, for example, Patent Document 1 describes a method of supplying a cleaning liquid to an air-diffusing pipe to clean the inside of the air-diffusing pipe to remove sludge. [0005] Patent Document 2 describes an air diffuser tube in which a discharge port is formed in a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/20
CPCC02F3/201C02F3/208Y02W10/10C02F3/14C02F7/00C02F3/20C02F3/1273C02F3/1278C02F3/006B01D65/02B01D65/08B01F23/23B01F2101/305B01D2321/185
Inventor 川岸朋树矢之根胜行中原祯仁
Owner MITSUBISHI CHEM CORP
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