Backflow air-floating device for water-arrangement optimization multi-phase flow pump

A multi-phase flow pump and multi-phase flow technology, applied in the direction of flotation water/sewage treatment, etc., can solve the problems of high power consumption, complex structure and high operating cost

Inactive Publication Date: 2008-05-21
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Shallow air flotation uses the principle of zero flow rate of water inflow, only 5-10 minutes of hydraulic retention time is needed for the floc to float up, and the air flotation tank can be made very shallow, so it has the advantages of small footprint, high removal efficiency, and good water outlet However, there are also disadvantages such as complex structure, large equipment investment, high power consumption and high operating cost.

Method used

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  • Backflow air-floating device for water-arrangement optimization multi-phase flow pump
  • Backflow air-floating device for water-arrangement optimization multi-phase flow pump
  • Backflow air-floating device for water-arrangement optimization multi-phase flow pump

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Embodiment 1

[0034] The specific implementation of the device of the present invention will be described below in conjunction with the accompanying drawings.

[0035] As shown in FIG. 1 , the sewage or waste water to be treated is pumped by the water inlet pump 2 and enters the air flotation chamber 12 of the air flotation tank 1 from the sewage water inlet 21 and the water inlet pipe 22 . A flocculant dosing port 31 is provided before the pump of the water inlet pipeline, and a flocculant polyaluminum chloride (PAC) is added in a certain amount, and a coagulant dosing port 32 is provided near the entrance of the air flotation tank after the pump, Add coagulant polyacrylamide (PAM) in a certain amount. The reason why the two agents are not added at the same dosing point is that adding the coagulant after a certain period of flocculation reaction has the best effect. When the air flotation tank is not full of water in the first operation, the water enters the air flotation chamber from the...

Embodiment 2

[0040] Utilize the device of the same example 1 provided by the present invention to process a kind of oily waste water, its water quality water quantity is: oil content 153mg / L, COD cr 786mg / L, continuous treatment of water about 1200m per day 3 (50m 3 / h). Addition amount of PAC40mg / L, PAM2mg / L, continuous dosing. The reflux ratio is adjusted to 25%, and the treated water quality is 5.5mg / L oil content, COD cr 43mg / L, the removal rate reaches 96.4% of oil removal rate and 94.5% of COD removal rate.

Embodiment 3

[0042] Utilize the device of the same example 1 provided by the present invention to process the white water of a papermaking enterprise with an annual output of 5,000 tons of toilet paper, and its water quality and quantity are: COD cr 650mg / L, SS (suspended solids) 485mg / L, continuous treatment of water about 1800m per day 3 (75m 3 / h). The amount of medicine added is PAC60mg / L, PAM1mg / L, continuous dosing. The reflux ratio is adjusted to 20%, and the index COD of the treated water cr 54.5mg / L, SS46mg / L, COD removal rate is 91.6%, suspended matter removal rate is 90.5%, and the effluent reaches the national first-class discharge standard.

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Abstract

The invention relates to a multi-phase flow pump reflux dissolved air flotation device, which is used for the treatment of oil-containing, papermaking and other industrial waste water and urban sewage. The device includes a water inlet pump, a multiphase flow dissolved air pump, an inlet water swirl distribution head, a backflow dissolved air swirl distribution head, a clear water collection pipe, a slag scraper, and a slag collection tank. Because the device adopts multi-phase flow pump to dissolve air and dynamic swirl to distribute water, it saves air compressors, dissolved air tanks and other equipment, and has the characteristics of simple structure, small footprint, energy saving and high removal efficiency.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and relates to an air flotation device for optimizing water distribution by multiphase flow pump backflow, in particular to a sewage treatment device for removing pollutants by using a method for optimizing water distribution by using multiphase flow pump dissolved air backflow to optimize water distribution. Background technique [0002] With the rapid development of the national economy and the improvement of people's consumption levels, the discharge of urban sewage and industrial wastewater has increased year by year, especially in recent years. The growth rate of the discharge of major pollutants in industrial wastewater has exceeded the growth rate of the gross national product. It destroys the balance between national economic growth and ecological environment protection, and restricts the development of industrial civilization. Petroleum, electric power, iron and steel, p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/24
Inventor 张超
Owner CHINA NAT OFFSHORE OIL CORP
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