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External circulation type pressurized dissolved air floatation-membrane separation water treatment method and device

A technology of water treatment device and pressurized dissolved air, which is applied in the direction of flotation water/sewage treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., which can solve the problems of low air flotation efficiency and achieve improvement The effect of effluent water quality, reduction of membrane fouling, and mitigation of membrane fouling

Active Publication Date: 2014-08-13
ENVIRONMENTAL PROTECTION RES INST OF LIGHT IND
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide an external circulation pressurized dissolved air flotation-membrane separation water treatment method, which can effectively alleviate membrane fouling, improve membrane flux, and solve the problem of air flotation in existing membrane-air flotation equipment. The problem of low efficiency, more effective air flotation, can be applied to the advanced treatment of higher concentration wastewater

Method used

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  • External circulation type pressurized dissolved air floatation-membrane separation water treatment method and device
  • External circulation type pressurized dissolved air floatation-membrane separation water treatment method and device
  • External circulation type pressurized dissolved air floatation-membrane separation water treatment method and device

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Embodiment 1

[0029] External circulation pressurized dissolved air flotation-membrane separation water treatment device

[0030] Such as figure 1 As shown, the external circulation pressurized dissolved air flotation-membrane separation water treatment device of the present invention includes a coagulation system, an air flotation system and a membrane separation system connected in sequence. The coagulation system includes a coagulation tank 3 and an agitator 4. Two partitions 5 are arranged in the coagulation tank 3 to divide the coagulation tank 3 into three coagulation areas, and an agitator 4 is arranged in each coagulation area. The air flotation system includes an air flotation tank 6, a dissolved air releaser 8, a slag scraper 9 and a dissolved air tank 10. The air flotation tank 6 is divided into a contact chamber and a separation chamber by a diversion baffle 7, and a dissolved air releaser is arranged at the bottom of the contact chamber 8, and the dissolved air releaser 8 is a...

Embodiment 2

[0036] External circulation pressurized dissolved air flotation-membrane separation water treatment method

[0037] The method for water treatment using the external circulation type pressurized dissolved air flotation-membrane separation device of embodiment 1 is as follows:

[0038] After the wastewater to be treated is dosed in the dosing box 1, it is pumped into the coagulation tank 3 of the coagulation system through the dosing pump 2. When the wastewater flows through the first coagulation zone, it is stirred by rapid stirring, and the stirring speed is 100-400s -1 , after passing through the first coagulation zone, the wastewater enters the second coagulation zone and the third coagulation zone in turn through the partition 5, and the second coagulation zone adopts medium-speed stirring, and the stirring speed is 50-200s -1 , in the third coagulation zone, the method of slow stirring is used for stirring, and the stirring speed is 20-100s -1 The waste water completes ...

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Abstract

The invention discloses an external circulation type pressurized dissolved air floatation-membrane separation water treatment method, which comprises the following steps that a. chemicals are added into wastewater to be treated, and coagulation reaction is completed through a coagulation system; b. wastewater subjected to coagulation enters an air floatation system to be subjected to partial backflow pressurized dissolved-air air floatation; and c. air floatation outlet water subjected to air floatation treatment enters a membrane separation system, and completes the membrane separation process under the effect of a membrane assembly, treated purified water and concentrated water are obtained, and the concentrated water obtained after membrane separation is injected into a dissolved air tank of the air floatation system in the step b from the bottom of a membrane separation pool for forming dissolved air water. The method provided by the invention has the advantages that the membrane pollution can be effectively relieved; the membrane flux is improved; in addition, the problem of low air floatation efficiency in the existing membrane-air floatation equipment is solved; the air floatation effect is more effectively realized; and the method and the device can be applicable to deep treatment of higher-concentration wastewater.

Description

technical field [0001] The invention relates to a water treatment method, in particular to an external circulation type pressurized dissolved air flotation-membrane separation water treatment method, and the invention also relates to an external circulation type pressurized dissolved air flotation-membrane separation water treatment method device. Background technique [0002] Due to its many advantages in the field of water treatment, such as excellent effluent quality, small footprint, small effluent quality fluctuations, and easy automatic control, membrane separation technology has become a hot research and application focus. In recent years, with the gradual maturity of membrane separation technology and the decline of cost, it has been widely used in the treatment of water and wastewater. However, there are certain restrictive factors in the membrane technology itself, such as membrane fouling and the deterioration of the membrane material itself, which seriously affe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/24C02F1/44
Inventor 张忠国钱宇刘丹吴月任晓晶何沛然赵可卉
Owner ENVIRONMENTAL PROTECTION RES INST OF LIGHT IND
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