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Micro-positive pressure fully-closed large air floatation apparatus and sewage treatment method

A micro-positive pressure and fully-sealed technology, which is applied in flotation water/sewage treatment, water/sewage treatment, water/sewage treatment equipment, etc., can solve the problems of shortening the service life of equipment, aggravating equipment, and heavy maintenance workload. Achieve the effects of improving flotation separation efficiency, simple and reliable operation, efficient and stable operation

Inactive Publication Date: 2017-02-01
青岛海晏环境技术工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the air flotation devices in the built projects use huge reinforced concrete tanks, which occupy a large area, make it difficult to distribute water and gas, and there are many dead zones in the system operation, poor drainage and sewage discharge, serious secondary pollution, inconvenient operation and management, and the system cannot be effective Airtightness leads to exhaust gas leakage, which seriously affects environmental sanitation and safety control
At present, the gradually mature steel structure air flotation equipment has the following problems: the processing capacity is small, and there are few large-scale equipment, which makes it difficult to meet the processing capacity requirements; the system cannot be effectively sealed, resulting in exhaust gas leakage that seriously affects environmental sanitation and safety control; the gas source uses air, which aggravates the Corrosion and fouling of equipment shorten the service life of equipment; compact structure, high hydraulic water quality load and large variation range, there are problems such as short flow, back mixing, large hydraulic disturbance, poor separation effect, and serious failure of equipment fouling; water distribution and gas distribution The design is unreasonable, the foam layer is thin and cannot be evenly distributed to the air flotation tank, the air flotation effect in the latter stage is not ideal, and the phenomenon of slag and back-mixing is obvious; the surface of the filler is very weak in anti-sticking and dirt, and it is easy to be stained by dust, oil stains, etc. Pollutant pollution, long-term operation is often fouled, which seriously affects the normal operation of the equipment; the release of dissolved air is poor, and the internal special releaser is often blocked and difficult to repair, which seriously affects the treatment effect and normal operation of the equipment; It is scraped into the slag collection tank or a large amount of sewage is overflowed from the slag collection tank due to the high liquid level; the flow-passing parts are prone to fouling, and the maintenance workload is heavy; Large; low degree of automatic operation, poor stability

Method used

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  • Micro-positive pressure fully-closed large air floatation apparatus and sewage treatment method
  • Micro-positive pressure fully-closed large air floatation apparatus and sewage treatment method
  • Micro-positive pressure fully-closed large air floatation apparatus and sewage treatment method

Examples

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Effect test

Embodiment 1

[0038] Example 1: Nitrogen is used as the gas source, the equipment is sealed with a slight positive pressure, and the sewage water inlet is at one end of the equipment;

Embodiment 2

[0039] Example 2: The gas source is nitrogen, the equipment is sealed with a slight positive pressure, the water inlet is in the middle of the equipment, and the two ends are symmetrically distributed;

[0040] The wastewater treatment effect is as follows:

[0041]

[0042] As can be seen from the above table, the equipment and method of the present invention have remarkable effects.

[0043] During the operation of the device of the present invention, even when the water quality is extremely deteriorated, the air flotation device of the present invention can always remove pollutants stably, achieve the goal of oil removal and clear water, and the oil content of the effluent is always at 20mg / Below L, or even lower; the suspended matter content of the effluent is also below 50mg / L, so the effluent is clear and the sensory effect is better; the COD of the effluent is maintained below 200-250mg / L, and when the quality of the influent water is poor, the COD of the effluent c...

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PUM

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Abstract

The invention relates to a micro-positive pressure fully-closed large air floatation apparatus. The apparatus comprises an air dissolving system and an air floatation device body, a coagulation chamber is provided with a sewage inlet, an air dissolving system release opening is arranged beside the sewage inlet in the coagulation chamber, the coagulation chamber is formed by coagulation spacing boards, micro-bubble releasing chambers formed by spacing boards are arranged beside the coagulation chamber, separation areas are arranged beside the micro-bubble releasing chambers, the separation areas are provided with inclined board groups, the upper portion of the air floatation device body is provided with an arc-shaped top cover, the arc-shaped top cover and the air floatation device body are sealed, the air floatation device body is connected with a gas supply device, a pressure release device and a pressure control device, and the pressure control device controls the gas supply device and the pressure release device to make the pressure in the air floatation device body always be a micro-positive pressure. The air flotation device is symmetric separation structure, improves the flotation separating efficiency and avoids return mixing of falling residues; and trapezoid water collecting weirs are arranged along the length direction of the tank to realize effective residue scraping and prevent overflow of residue collecting tanks, so the adjustment of a water outlet weir is not needed when the water flow greatly fluctuates.

Description

technical field [0001] The invention relates to a large-scale dissolved air flotation sewage treatment device and a sewage treatment method using the equipment. Background technique [0002] Air flotation is to pass tiny and fine air bubbles (milk-like) into the sewage containing polluted impurities and fully disperse them to form a "water-gas-particle" three-phase mixed system. Pollutants in the water form a gas-particle combination—flotation body, which floats to the water surface in the form of foam, so that the pollutants are separated from the sewage. Therefore, the essence of air flotation treatment of wastewater is physical adsorption between air bubbles and particles, and the formation of flotation bodies to float and separate. The air flotation process can be divided into electrolytic (coagulation) air flotation, diffuse air flotation (such as jet-induced air flotation, vortex concave air flotation, etc.) and dissolved air flotation according to the different gener...

Claims

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Application Information

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IPC IPC(8): C02F1/24C02F1/52
CPCC02F1/24C02F1/52C02F2201/002C02F2301/02
Inventor 刘兴超陈萍刘发高杨阳陈为敬刘晨
Owner 青岛海晏环境技术工程有限公司
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