CN205556305U - Handle compressor exhaust oily sewage's equipment - Google Patents

Abstract

The utility model discloses a device for treating oily sewage discharged from a compressor, which belongs to the field of sewage treatment. The device includes a primary sewage treatment system, a demulsification tank and an air flotation tank connected in sequence, and the primary sewage treatment system and the demulsification tank are connected in sequence. There is a first booster pump, the top of the demulsification tank is connected with a demulsifier storage tank, and an overflow weir is arranged in the demulsification tank, and the overflow weir divides the demulsification tank into a demulsification area and an oil collection area, and the bottom of the oil collection area It is connected to a waste oil treatment system, and a stirrer is installed in the demulsification area; the bottom of the demulsification area is connected to a second booster pump, and the outlet of the second booster pump is connected to the air flotation tank. The diameter of the bubbles produced by the utility model can be as small as 30-120 microns, and the diameter of the bubbles is small. When the air supply is the same, the specific surface area of the bubbles is large during adsorption, the floating speed of the bubbles is slowed down, and the contact time with the adsorption particles is increased, which can improve floating effect.

Description

Equipment for treating oily sewage discharged from compressors

technical field

The utility model belongs to the field of sewage treatment, in particular to a device for treating oily sewage discharged from a compressor.

Background technique

With the rapid development of industrialization, the use of oil products is increasing. However, due to various technical limitations and backward management, a large amount of oil products enter the water body and form pollution. There are many sources of oily wastewater. Oily wastewater will be produced in oil extraction, oil refining, oil storage and transportation in the petroleum industry, as well as in the oil tanker ballast water, tank washing water, cold lubricating fluid in the machinery industry, steel rolling water, and grain and oil processing, leather, and papermaking. Wastewater from waste water, textiles, and food processing (including catering) also contains a large amount of oil.

Oily wastewater is a large-volume, wide-ranging and seriously harmful pollution source. The difficulty of its treatment depends on the source, composition and form of oil. Oil in oily wastewater usually exists in four forms: slick oil, dispersed oil, emulsified oil and dissolved oil. There are many methods to treat oily wastewater, but they can be classified into four categories: physical methods (such as centrifugal separation, coarse granulation, membrane separation), chemical methods (such as acidification, chemical oxidation, photochemical catalytic oxidation) , physical chemical method (such as flotation method, adsorption method, magnetic adsorption separation method) and biochemical method (such as activated sludge method, biofilm method).

The discharge of oily wastewater into the water body will cause serious impacts. When the thickness of the oil film on the water surface is greater than 1 μm, the gas exchange between the air and the water body will be cut off, resulting in a decrease in dissolved oxygen in the water body, resulting in stench, deterioration of water quality, and death of aquatic organisms due to lack of oxygen. Fish, shellfish, etc. have become stale and cannot be used. The oil spilled on the surface of sea birds will lose their flight function and even cause the birds to die.

At present, the air-distributing flotation method is widely used. This method mainly breaks the air bubbles mixed into the water with the help of mechanical shear force, or disperses the air into fine air bubbles before entering the waste water, and carries out air-water mixing and flotation. The impeller flotation method is often used. , Jet floatation method and porous material (such as diffusion plate, microporous tube, canvas tube, etc.) In addition, if the porous material is aerated and floated, the porous material will be easily blocked, which will affect the operation.

Utility model content

The purpose of the utility model is to provide a device for treating oily sewage discharged from a compressor.

Based on the above purpose, the utility model adopts the following technical scheme: the equipment for treating the oily sewage discharged from the compressor includes a primary sewage treatment system, a demulsification tank and an air flotation tank connected in sequence, and a demulsification tank is installed between the primary sewage treatment system and the demulsification tank The first pressurized pump, the top of the demulsification tank is connected to the demulsifier storage tank, and the overflow weir is arranged in the demulsification tank, and the overflow weir divides the demulsification tank into the demulsification area and the oil collection area, and the bottom of the oil collection area is connected with Waste oil treatment system, agitator is installed in the demulsification area; the second pressure pump is connected to the bottom of the demulsification area, and the outlet of the second pressure pump is connected to the air flotation tank; the air flotation tank is connected to the air flotation agent storage tank , Sand filter and waste residue treatment system.

Further, the air flotation tank is provided with a partition plate, which divides the air flotation tank into an air flotation area and a slag collection area, the air flotation agent storage tank is connected to the upper part of the air flotation area, and a There is a moving scraper, a bubble generator is installed in the air flotation area, a fan is connected to the air flotation area, a sludge collection device is connected to the bottom of the air flotation area, and a waste slag treatment system is connected to the bottom of the slag collection area.

Furthermore, an insulation layer is provided on the outer wall of the air flotation tank. In winter, due to the low air flotation temperature, the treatment effect is poor, and an insulation layer can be added to improve the air flotation effect.

Further, the primary sewage treatment system includes sequentially connected separators, buffer tanks, blowing tanks, primary grease traps and secondary grease traps, and the construction of grease traps can remove most of the suspended oil, while dispersing The oil in the state of emulsification and the oil in the emulsification state enter the emulsification tank and the air flotation tank through the booster pump for treatment.

Further, metering controllers are provided on the outlets of the demulsifier storage tank and the air-floating agent storage tank.

The utility model treats the oily sewage discharged from the compressor by the dissolved air flotation method. The emulsification tank emulsifies the oily sewage and injects it into the air flotation tank through a pressurized pump, and the disturbance of the tiny bubbles generated by the air flotation tank makes the sludge in the waste water constantly rub against each other. The mud is separated from the oil adsorbed on the surface, and the flocculant polyaluminum chloride and the coagulant polyacrylamide are added to the sewage to promote the adhesion of small oil droplets to the flocs, forming a floating body with a specific gravity smaller than water to float on the water surface , so as to achieve the purpose of oil-water separation, the micro-bubbles float the dispersed oil to the liquid surface and remove it through the scraper, so as to realize the treatment of oily sewage.

The diameter of the bubbles produced by the utility model can be as small as 30-120 microns, and the diameter of the bubbles is small. When the air supply is the same, the specific surface area of the bubbles is large during adsorption, the floating speed of the bubbles is slowed down, and the contact time with the adsorption particles is increased, which can improve Floating effect.

The equipment provided by the utility model has the advantages of simple structure, low economic cost, and can effectively reduce the oil content in sewage, and the treated waste water can reach the national "Comprehensive Wastewater Discharge Standard" (GB8978-1996).

Description of drawings

Fig. 1 is a schematic structural view of the processing equipment provided by the present invention.

detailed description

Below in conjunction with embodiment the utility model is described in detail.

Equipment for treating oily sewage discharged from compressors, including separator 16, buffer tank 15, blowing tank 14, primary grease trap 13, secondary grease trap 1, secondary grease trap 1 and demulsification tank connected in sequence 4 is provided with a first booster pump 2, the top of the demulsification tank 4 is connected with a demulsifier storage tank 3, the outlet of the demulsifier storage tank 3 is equipped with a metering controller, and the demulsification tank 4 is provided with an overflow weir 42 The overflow weir 42 divides the demulsification tank into a demulsification area 43 and an oil collection area 44. The bottom of the oil collection area 44 is connected to a waste oil treatment system 5, and an agitator 41 is provided in the demulsification area 43.

The bottom of the demulsification area 4 is connected with a second pressurized pump 6, and the outlet of the second pressurized pump 6 is connected with the air flotation tank 8; Plate 83 and partition plate 83 divide the air flotation tank 8 into an air flotation area 86 and a slag collection area 85. The air flotation agent storage tank 7 is connected to the upper part of the air flotation area 86, and a mobile scraper 82 is arranged above the air flotation area 86. , the air flotation area 86 is provided with a bubble generator 81, the air flotation area 86 is connected with a fan 10, the bottom of the air flotation area 86 is connected with a sludge collection device 17 through a sewage pump 11, and the sewage outlet of the air flotation area 86 is connected to the sand filter. The pools 9 are connected; the bottom of the slag collection area 85 is connected to the waste slag treatment system 12 .

The method of using the above-mentioned treatment equipment to treat oily sewage includes the following steps: (1) The oily sewage discharged from the compressor passes through the separator 16 for oil-water separation in sequence, and then is discharged to the blowing tank 14 through the pouring of the buffer tank 15. After simple separation in the tank 13, it enters the secondary oil separation tank 1 for separation, and then pumps it into the demulsification tank 4 by the first booster pump 2; the oily sewage and polyaluminum chloride are mixed and stirred at 75~85°C, 50kg of demulsifier is added to 100 m ³ of oily sewage, and the waste oil in the upper layer passes through the overflow weir 42 for recycling; (2) The sewage in the lower layer enters the air flotation tank 8 for air flotation treatment, and the sewage in the lower layer and the air flotation agent (mass ratio is 10 ︰4 polyaluminum chloride and polyacrylamide mixed), mixed with air for 6~8 hours, and then moved the scraper 82 to scrape off the upper layer of oil residue, wherein, 50kg of air flotation agent was added to every 100m3 ^of oily sewage; when the COD in the wastewater≤ When the concentration is 60 mg/L, the sewage in the lower layer is discharged to the sand filter 9 for treatment.

After testing, the various indicators of sewage discharged from the compressor treated by the method and equipment provided by the utility model are shown in Table 1, and all indicators are in line with the provisions of GB8978-1996.

Claims (5)

1. process the equipment of oil-polluted water that compressor is discharged, including the primary sewage disposal system being sequentially connected with, breakdown of emulsion groove and Air flotation slot, it is characterised in that being provided with the first force (forcing) pump between primary sewage disposal system and breakdown of emulsion groove, breakdown of emulsion groove top connects to be had Demulsifier storage tank, is provided with downflow weir in breakdown of emulsion groove, breakdown of emulsion groove is divided into breakdown of emulsion district and Shou You district by downflow weir, connects bottom Shou You district Waste oil treatment system, breakdown of emulsion is had to be provided with agitator in district；Connect bottom breakdown of emulsion district and have the second force (forcing) pump, the second force (forcing) pump outlet with Air flotation slot is connected；Connect on air flotation slot and have gas floatation agent storage tank, sand filter and Solid state fermentation system.

The equipment of the oil-polluted water that process compressor the most according to claim 1 is discharged, it is characterised in that described air flotation slot Inside being provided with demarcation strip, demarcation strip will be divided into air flotation zone and slag collecting area in air flotation slot, and gas floatation agent storage tank is connected to top, air flotation zone, gas Floating region is arranged over mobile scraper, is provided with bubble generator in air flotation zone, and bubble generator connects has blower fan, bottom air flotation zone Connect and have mud collection device；Connect bottom slag collecting area and have Solid state fermentation system.

The equipment of the oil-polluted water that process compressor the most according to claim 2 is discharged, it is characterised in that described air flotation slot Outer wall is provided with heat-insulation layer.

The equipment of the oil-polluted water that process compressor the most according to claim 3 is discharged, it is characterised in that described primary dirty Water treatment system includes separator, surge tank, blowout groove, one-level oil interceptor and the two grades of oil interceptors being sequentially connected with.

The equipment of the oil-polluted water that process compressor the most according to claim 4 is discharged, it is characterised in that described demulsifier It is equipped with measurement controller in the outlet of storage tank and gas floatation agent storage tank.