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Standing-free dynamic membrane formation method and device

A dynamic membrane, unsupported technology, applied in chemical instruments and methods, sustainable biological treatment, water/sludge/sewage treatment, etc. The effect of reducing investment cost, forming method and device is simple

Inactive Publication Date: 2017-03-22
天津东风节能环保科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the actual treatment of sewage, the dynamic membrane with support has the following disadvantages: (1) the time required for the formation of a stable dynamic membrane is long, and the cultivation of the initial dynamic membrane is greatly affected by the environment and takes a lot of time; Water quality has a great influence on the formation of membranes. Taking microbial dynamic membranes as an example, when the content of certain pollutants in the water is too high, it will destroy the growth of microorganisms; (3) It is difficult to restore the filtration capacity and membrane flux in a short time. If the layer is damaged, it will take a long time to cultivate, which will affect the pass rate of the effluent; (4) The effluent quality is unstable, and the treatment effect is limited by the flow rate. If the flow rate is too high, the reaction time between the film layer and the pollutants will be shortened, and the sewage The treatment effect is not good; (5) The operation is cumbersome and the investment cost is high

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0032] Domestic sewage is used as the treatment sample, and the effluent is required to meet the first-level B standard of the urban sewage plant pollutant discharge standard (GB18918-2002).

[0033] The preparation and experiment process of dynamic membrane with support layer are as follows:

[0034] A nylon mesh with a pore size of 1 mm was arranged at 10 mm above the collection pipe 4 in the experimental device. The treated water volume is 0.5m 3 / h, the hydraulic retention time is 4h, and the control range of the influent flow rate is: 0.5~0.8m / s.

[0035] The domestic sewage is mixed with oil-activated sludge, and the aeration head is installed under the water distributor, and the aeration pipe is connected to the fan laterally to continuously enter the air. After the living and activated sludge flora are fully mixed, enter the water experiment device, and stop aeration after working for 2 hours. Take water samples to analyze the water quality, stop the aeration, lower...

Embodiment 2

[0044]Taking the oily sewage of Daqing Petrochemical Plant as the treatment sample, it is required that the effluent index can enter the biochemical pool of the refinery.

[0045] Table 2:

[0046] project 0il(mg / L) SS(mg / L) Biochemical Influent Standard 50 50 Experimental water quality 473.3 1838.3 The effluent water quality of the unsupported membrane after 2h 26.7 18.9

[0047] The preparation and experiment process of the unsupported dynamic membrane are as follows:

[0048] The treated water volume is 0.5m 3 / h, the hydraulic retention time is 4h, and the control range of the influent flow rate is: 0.9~1.1m / s.

[0049] The oily sewage is fully mixed with the water purifying agent, flocculant and coagulant aid, and then continuously rotates from the center of the bottom of the equipment at a certain angle into the conical bucket 3, and a dynamic film begins to form on the upper part of the collection pipe 4. After 2 hours, a dynami...

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Abstract

The invention provides a standing-free dynamic membrane formation method and device. The method comprises the steps that a flocculating agent and a coagulant aid are added into sewage, precipitated pollutants form big flocculations by combining the hydraulic condition, and a standing-free dynamic filter membrane is formed in the device. The device comprises a water distributor, a taper hopper and a straight cylinder which are connected in sequence from bottom to top, a water inlet pipe is arranged on the water distributor, a big opening of the taper copper faces upwards, the straight cylinder is provided with a collecting pipe and a water outlet pipe, and the height of the water outlet pipe is higher than that of the collecting pipe; to-be-treated sewage is fully mixed with medicament to enter the water distributor through a water inlet pipe, and the medicament comprises the flocculating agent and the coagulant aid. According to the standing-free dynamic membrane formation method and device, limitation of environment or inflow water quality or inflow water flow velocity on the dynamic membrane is reduced to the minimum, and meanwhile preparation operation of the dynamic membrane is greatly simplified, and the investment cost is lowered.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a method and device for forming an unsupported dynamic membrane for removing suspended matter in sewage. Background technique [0002] As a new type of filtration technology, dynamic membrane filtration technology overcomes the shortcomings of traditional membrane modules such as high price, heavy membrane pollution, and low membrane flux, and is gradually applied in the sewage treatment industry. According to the conditions of dynamic membrane formation, dynamic membranes are divided into dynamic membranes with supports and dynamic membranes without supports. The dynamic membrane with support is used to domesticate microorganisms or coat special materials on the support to remove suspended solids in water. For example, the dynamic membrane support used to treat domestic sewage is made of flexible plastic materials, and activated sludge is used to hang membranes on it a...

Claims

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Application Information

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IPC IPC(8): C02F3/34C02F3/30C02F3/12
CPCC02F3/12C02F3/30C02F3/34Y02W10/10
Inventor 房东发陈茗
Owner 天津东风节能环保科技有限公司
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