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Back-flushing operation method of dynamic membrane bioreactor

A technology of bioreactor and operating method, which is applied in the field of sewage treatment, can solve the problems of long time required for dynamic membrane recovery, large aeration volume and aeration time, low efficiency of aeration and backwashing, etc., to reduce the degree of damage, The effect of shortening time and reducing membrane fouling

Inactive Publication Date: 2006-10-11
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Disadvantages of the above operation mode: the reactor mixed solution does not wash the dynamic membrane enough, which may easily cause membrane fouling; the efficiency of aeration and backwashing is very low, and a large amount of aeration and aeration time are required, especially for non-woven fabrics. The dynamic membrane bioreactor based on the base material backwashes the dynamic membrane in the form of air aeration, and the base material is difficult to be disturbed, which further reduces the efficiency of backwashing
High-pressure water cleaning damages the dynamic membrane too thoroughly, and it takes a long time to recover the dynamic membrane after backwashing

Method used

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  • Back-flushing operation method of dynamic membrane bioreactor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] The structure is shown in the attached figure. The dynamic membrane bioreactor adopts constant flux filtration. The MLSS of the reactor is 5000mg / L, the DO is 2.0-4.0mg / L, the influent COD is 200mg / L, and the influent ammonia nitrogen is 50mg / L. During operation, when the gas-water ratio is 60:1, the effluent COD is 25mg / L, the effluent ammonia nitrogen is 1.0mg / L, and the turbidity of the effluent is 4NTU. After the reactor runs stably for 60 days, the head of the effluent water reaches 12cm, requiring backwashing . The backwash intensity is 3.2m 3 / (m 2 *h), backwashing time is 5min. 60 minutes after backwashing, the quality of the effluent from the reactor decreased to the level before backwashing and tended to be stable, the dynamic membrane was fully restored, and the head of the effluent from the reactor dropped to 1.5cm.

Embodiment 2

[0014] Reactor operating conditions and influent water quality are basically the same as in Example 1. During the operation, the gas-water ratio is 60:1. After 60 days of stable operation of the reactor, the head of the effluent reaches 12 cm, and backwashing is required. The backwash intensity is 3.2m 3 / (m 2 *h), backwashing time is 20min. After 90 minutes of backwashing, the effluent from the reactor was stable, the dynamic membrane was fully recovered, and the head of the effluent from the reactor was reduced to 0.7cm.

Embodiment 3

[0016] The operating conditions of the reactor and the quality of the influent and effluent water are basically the same as in Example 1. During the operation, the gas-water ratio is 60:1. After 60 days of stable operation of the reactor, the head of the effluent reaches 12 cm, and backwashing is required. The backwash intensity is 3.2m 3 / (m 2 *h), backwashing time is 12min. After 75 minutes of backwashing, the effluent from the reactor reached stability, the dynamic membrane was fully restored, and the head of the effluent from the reactor was reduced to 1.0 cm.

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Abstract

The invention discloses a backwash operating mode of dynamic flim bioreactor, which belongs to the technical sphere of sewage disposal. Setting Film assembly made from bolting silk on the middle of the reaction, installing aeration device on its bottom, filtering by dynamic flim, making aeration device below film assembly, both supply oxygen for upper miscible liquids and accelerate the flow of miscible liquids, by the flow of bubble and miscible liquids, enhancing scouring and disturbance to dynamic flim; during the operation of dynamic flim bioreactor, when backwash needed, closing water outlet, opening backwash aeration pipe, supplying gas of 1.6- 8.0m3 / (m2*h) by backwash gas pump. The invention, greatly improves backwash efficiency, reduces aeration intensity and aeration time and cuts operating cost dowm; compared with cleaning with water under high pressure, it can proceedis on line, don't effect the operation of reaction, reduces the damage degree to dynamic flim, and shoertens the recovery time of dynamic flim.

Description

technical field [0001] The invention relates to a backwash operation method of a dynamic membrane bioreactor, belonging to the technical field of sewage treatment. Background technique [0002] Currently used dynamic membrane bioreactors are all equipped with a baffle in the reactor, and the baffle divides the reactor into two parts, and the two parts are connected up and down. A membrane module is installed at one end, water is fed into the other end, and aeration is aerated at the water inlet end; a membrane module is installed at the other end, and water is discharged by utilizing the head difference between the liquid level of the reactor and the water outlet of the membrane module. During the operation of the dynamic membrane bioreactor, with the growth and reproduction of microorganisms, the dynamic membrane will become thicker and thicker, which will lead to the increase of membrane filtration resistance and the continuous increase of effluent head. When the effluent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/02C02F3/10
CPCY02W10/10
Inventor 张建邱宪锋张成禄高宝玉
Owner SHANDONG UNIV
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