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Closed air floatation device and air floatation method

A closed, air flotation technology, applied in the direction of chemical instruments and methods, flotation water/sewage treatment, water treatment parameter control, etc., can solve the secondary pollution of the surrounding environment and other problems

Active Publication Date: 2021-05-07
SHANGHAI LANKE PETROCHEM ENG & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the current air flotation devices all use non-closed reactors, and the malodorous gas generated by the air flotation will cause secondary pollution to the surrounding environment; especially in petrochemical and coal chemical enterprises, there are safety risks such as explosions and fires.

Method used

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  • Closed air floatation device and air floatation method
  • Closed air floatation device and air floatation method
  • Closed air floatation device and air floatation method

Examples

Experimental program
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Effect test

Embodiment 1

[0077] Water intake 50m 3 / h, the total oil concentration is 250mg / L, the suspended matter concentration is 170mg / L, adopt the closed air flotation device of the present invention, add PAC 200mg / L and anion PAM 5mg / L in the pipeline mixer, and close the reactor Equipped with a four-stage separation chamber, the operating pressure is 0.06MPa, the reaction temperature is 35°C, the total residence time is 10min, the reflux ratio is 20%, the gas-water ratio is 0.005, and the floor area is 8m 2 . The treated effluent is discharged outside, and the scum enters the sludge treatment system for treatment without waste gas emission. After treatment, the total oil concentration in the effluent was 19mg / L, and the removal rate was 92.4%; the concentration of suspended matter was 16mg / L, and the removal rate was 90.6%.

Embodiment 2

[0079] Water intake 50m 3 / h, the total oil concentration is 100mg / L, the concentration of suspended solids is 170mg / L, adopt the closed air flotation device of the present invention, add PAC 200mg / L and anion PAM 5mg / L to the pipeline mixer, closed reaction The device is equipped with four-stage separation chambers, the operating pressure is 0.06MPa, the reaction temperature is 35°C, the total residence time is 10min, the reflux ratio is 20%, the gas-water ratio is 0.005, and the floor area is 8m 2 . The treated effluent is discharged outside, and the scum enters the sludge treatment system for treatment without waste gas emission. After treatment, the total oil concentration in the effluent was 13mg / L, with a removal rate of 87%; the concentration of suspended solids was 14mg / L, with a removal rate of 91.8%.

Embodiment 3

[0081] Water intake 50m 3 / h, the total oil concentration is 250mg / L, the suspended matter concentration is 170mg / L, adopt the closed air flotation device of the present invention, add PAC 100mg / L and anion PAM 5mg / L to the pipeline mixer, closed reaction The device is equipped with four-stage separation chambers, the operating pressure is 0.06MPa, the reaction temperature is 35°C, the total residence time is 10min, the reflux ratio is 20%, the gas-water ratio is 0.005, and the floor area is 8m 2 . The treated effluent is discharged outside, and the scum enters the sludge treatment system for treatment without waste gas emission. After treatment, the total oil concentration in the effluent is 28mg / L, with a removal rate of 88.8%; the concentration of suspended solids is 17mg / L, with a removal rate of 90%.

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Abstract

The invention belongs to the technical field of air floatation, and discloses a closed air floatation device and an air floatation method. The air floatation device comprises a closed reactor and a micro-nano bubble generator, and the closed reactor is sequentially provided with a reaction chamber, a multi-stage separation chamber, a clear water chamber and a scum chamber in the water inlet direction; flow guide channels are respectively arranged between two adjacent stages of separation chambers and between the last stage of separation chamber and the clear water chamber, the side surface of each stage of separation chamber is provided with a water passing hole communicated with the flow guide channel, the upper layer of each stage of separation chamber is connected with the scum chamber through a scum collecting channel, and the tops of stages of separation chambers are communicated; the micro-nano bubble generator is arranged in the closed reactor and is communicated with the bottom of the separation chamber. The full-closed reactor is adopted, the multi-stage separation chambers are arranged in the full-closed reactor to perform air flotation treatment on sewage, the air flotation efficiency is high, nitrogen and other inert gases can be filled, intrinsic safety of an air flotation equipment body is achieved, emission of VOCs and other foul waste gas is avoided, and VOCs waste gas is prevented from polluting the environment.

Description

technical field [0001] The invention belongs to the technical field of air flotation, in particular to a closed air flotation device and an air flotation method. Background technique [0002] Air flotation technology is often used to treat tiny suspended solids, oil and grease in wastewater. This technology is to dissolve a certain amount of gas into the water to produce dissolved air water, and use the microbubbles formed by the pressure release of the dissolved air water to collide with flocs to form a three-phase mixture of gas, water, and oil (suspended solids), and float to the liquid. surface to achieve separation from water. [0003] Common air flotation processes include: pressurized dissolved air flotation and vortex concave air flotation. Pressurized dissolved air flotation is to circulate part of the treated wastewater into the dissolved air tank. Under the state of pressurized air, the air is supersaturated and dissolved, and then mixed with the raw water added...

Claims

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Application Information

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IPC IPC(8): C02F1/24
CPCC02F1/24C02F2201/002C02F2303/14C02F2303/02C02F2303/26C02F2209/42Y02W10/10
Inventor 王日彩韩媛媛张文军马洪玺朱洪张衡池剑亭杨秀梅
Owner SHANGHAI LANKE PETROCHEM ENG & TECH
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