CN209974593U - Cavitation air flotation equipment for sludge concentration - Google Patents

Cavitation air flotation equipment for sludge concentration Download PDF

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Publication number
CN209974593U
CN209974593U CN201920433519.7U CN201920433519U CN209974593U CN 209974593 U CN209974593 U CN 209974593U CN 201920433519 U CN201920433519 U CN 201920433519U CN 209974593 U CN209974593 U CN 209974593U
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air flotation
cavitation
tank
cavitation air
reaction tank
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CN201920433519.7U
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范春健
刘芳
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Mai Wang Environmental Technology Co ltd
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MCWONG ENVIRONMENTAL TECHNOLOGY Co Ltd
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Abstract

A cavitation air flotation device for sludge concentration comprises: the coagulating reaction tank, two parts of whirlpool air supporting groove, the coagulating reaction tank is equipped with the foaming agent and throws the mouth, the mixer, the export of coagulating reaction tank is through the access connection of pipeline and whirlpool air supporting groove, the front end of whirlpool air supporting groove is equipped with the aeration chamber, it adds the medicine mouth to be equipped with the flocculating agent on the pipeline that gets into the aeration chamber entry, the aeration is indoor to be equipped with whirlpool aeration machine, the whirlpool air supporting inslot is equipped with reflux unit, scrape the sediment device, the mud bucket, dross collecting vat and spiral row's sediment device and discharge gate, adjustable overflow weir plate and delivery port, whirlpool air supporting groove bottom is equipped with the mud bucket, the rear end is equipped with adjustable overflow weir plate and delivery port, the delivery port is connected with sewage treatment system's. The utility model has the advantages of small occupied area, stable operation, safety, reliability, low energy consumption, high automation degree, continuous operation and no odor overflow. In the process of sludge concentration, the process is simple, the adaptability is strong, and the treatment efficiency is high.

Description

Cavitation air flotation equipment for sludge concentration
Technical Field
The utility model relates to an environmental protection equipment, in particular to a cavitation air supporting equipment for sludge concentration.
Background
Sludge concentration is the primary process of sludge treatment, the prior commonly used sludge concentration adopts gravity concentration and mechanical concentration, the gravity concentration has the advantages of low maintenance management and power cost, large occupied area, poor sanitary condition and poor concentration effect, can not effectively remove water in the sludge, and because the sludge stays in a gravity concentration tank for a long time, an anaerobic environment is formed in the concentration tank, the phosphorus-rich sludge releases phosphorus in the concentration, so that the phosphorus removal effect of the whole system is poor, the use is limited, and the sludge is gradually replaced in a sewage treatment plant. The centrifugal equipment is one of mechanical concentration, has a series of advantages of simple process flow, strong process adaptability, high automation degree, continuous operation, strong process adjustability and the like when being used for sludge concentration, but has the defects of high investment cost, high operation cost and the like when being used for sludge pretreatment, and is not widely accepted.
Disclosure of Invention
The invention aims to provide a cavitation air flotation device for sludge concentration aiming at the defects in the prior art and the requirements of energy conservation and environmental protection of users. The utility model discloses an equipment includes: the device comprises a coagulation reaction tank and a cavitation air floating tank, and is characterized in that the coagulation reaction tank and the cavitation air floating tank are normal-pressure containers, and are made of carbon steel or stainless steel or concrete subjected to anti-corrosion treatment. The feed inlet of the coagulation reaction tank is connected with a lift pump, the residual sludge at the bottom of the secondary sedimentation tank of the previous procedure is lifted by the lift pump to enter the feed inlet of the coagulation reaction tank, the coagulation reaction tank is provided with a foaming agent adding port, and a stirrer is arranged in the coagulation reaction tank. Adding the foaming agent through an adding port of the foaming agent. And (3) coagulating the small-particle sludge in the feeding material to form larger-particle sludge under the action of a stirrer in the coagulation reaction tank. The outlet of the coagulation reaction tank is connected with the inlet of the cavitation air floating tank through a pipeline. The front end of the cavitation air-floating groove is provided with an aeration chamber, and a pipeline entering the inlet of the aeration chamber is provided with a flocculating agent feeding port. A vortex concave aerator is arranged in the aeration chamber. In the operation process, the hollow impeller at the bottom of the vortex concave aerator rotates fast to form a vacuum area in water, at the moment, air above the vacuum area is pumped to the bottom of the aeration chamber through the hollow pipeline, the impeller at the bottom of the vortex concave aerator rotates fast to generate three strands of shearing force to crush the air into micro bubbles, and the micro bubbles are organically combined with solid pollutants in feed sludge and rise to the liquid level. The aeration chamber bottom is equipped with the reflux unit who comprises several back flows, because the high-speed rotation of cavitation aeration machine forms the vacuum zone in the aeration chamber and produces little negative pressure, and cavitation air supporting groove bottom rivers receive the negative pressure effect, and the waste water that will still not fully react inhales the aeration chamber from the back flow of cavitation air supporting groove bottom, realizes that the secondary cycle of the pollutant that sinks gets rid of. The top of the cavitation air flotation tank is provided with a slag scraping device driven by a motor, and the lower part of the slag scraping device is provided with a scum collecting tank, a spiral slag discharging device and a discharging port. The slag scraping device is made of stainless steel, rubber, high polymer and other materials. The concentrated sludge entering the spiral slag discharging device is conveyed to a subsequent process by the spiral slag discharging device for dehydration, and a sludge discharge hopper is arranged at the bottom of the cavitation air flotation tank and used for depositing sludge with higher density and discharging the sludge periodically. The back end of the cavitation air flotation groove is provided with an adjustable overflow weir plate and a water outlet, and clear liquid separated by solid-liquid moves forwards by gravity and flows to the adjustable overflow weir plate at the back end from the cavitation air flotation groove to be discharged. The water outlet is connected with an adjusting tank of the sewage treatment system through a pipeline.
The cavitation aerator is vertically arranged in the aeration chamber, and a hollow impeller is arranged at the bottom of the cavitation aerator.
The adjustable overflow weir plate is adjusted by a hand wheel or automatically adjusted. The liquid level height of the overflow weir plate can be adjusted by adjusting the concentration and the amount of the treated sludge.
And waste gas overflowing from the sludge during the operation of the coagulation reaction tank and the cavitation air flotation tank is connected to a next treatment system through a pipeline.
The utility model has the advantages of small occupied area, stable operation, safety, reliability, low energy consumption, high automation degree, continuous operation, no odor overflow and the like. The cavitation air flotation process is used for effectively removing the interstitial water in the residual sludge, so that the volume of the sludge is reduced, the re-release of phosphorus enriched in the sludge is prevented due to short retention time, the running cost and running risk of a system are reduced, the treatment efficiency is improved, and the deep phosphorus removal process in a wastewater process section is reduced. The method has objective influence on post-stage sludge treatment equipment, type selection of pipelines and reduction of the dosage of medicaments.
In the process of sludge concentration, the process is simple, the adaptability is strong, the treatment efficiency is high, after the sludge is treated by the equipment, the water content of the residual sludge is reduced to less than 95 percent from the original 99 percent, the volume is reduced to the original 1/5, and the occupied area is 1/3 of gravity sludge concentration.
Drawings
Fig. 1 is a schematic view of the flow structure of the present invention.
In the figure: 1 feed inlet, 2 foaming agent dosing ports, 3 coagulation reaction tank, 4 flocculating agent dosing ports, 5 cavitation aerator, 6 aeration chamber, 7 sludge discharge hopper, 8 reflux unit, 9 slag scraping unit, 10 spiral slag discharging unit and discharge port, 11 adjustable overflow weir plate, 12 cavitation air flotation tank, 13 water outlet
Detailed Description
Example one
The embodiments of the present invention will be further explained with reference to the accompanying drawings:
referring to fig. 1, the working principle of the present embodiment is as follows: the sludge-water mixture after adding the drugs enters an aeration zone provided with a cavitation aerator, the cavitation aerator 5 forms a vacuum zone in the water through the rapid rotation of a hollow impeller at the bottom, at the moment, the air at the upper part is pumped into the bottom of the box body through a hollow pipeline, and the air is crushed into micro-bubbles under three shearing forces generated by the rapid rotation of the impeller at the bottom, and the micro-bubbles are organically combined with solid pollutants in the sludge and rise to the liquid level. After reaching the liquid level, the solid pollutants are supported by the micro bubbles and float on the water surface, the sludge after concentration is scraped into the spiral sludge discharge groove through the slag scraping device 9, and the clear liquid after solid-liquid separation is discharged from the water outlet 13 through the adjustable overflow weir plate 11. A small amount of solid pollutants which have larger specific gravity and cannot float upwards are periodically discharged through a mud discharge hopper 7 at the bottom of the cavitation air flotation tank.
The embodiment comprises a coagulation reaction tank 3 and a cavitation air flotation tank 12. The coagulation reaction tank 3 and the cavitation air flotation tank 12 are normal pressure containers, and the coagulation reaction tank 3 and the cavitation air flotation tank 12 are made of carbon steel or stainless steel or concrete and are subjected to anticorrosion treatment. The feed inlet 1 of the coagulation reaction tank 3 is connected with a lift pump, the residual sludge at the bottom of the secondary sedimentation tank of the previous procedure is lifted by the lift pump to enter the feed inlet 1 of the coagulation reaction tank 3, the coagulation reaction tank 3 is provided with a foaming agent feeding port 2, and a stirrer is arranged in the coagulation reaction tank 3. The foaming agent is added through a foaming agent adding port 2. Under the action of a stirrer in the coagulation reaction tank 3, the small-particle sludge in the feeding materials is coagulated to form larger-particle sludge, and the surface tension of the sludge is increased. The outlet of the coagulation reaction tank 3 is connected with the inlet of the cavitation air flotation tank 12 through a pipeline. The front end of the cavitation air flotation tank 12 is provided with an aeration chamber 6, and a pipeline entering the inlet of the aeration chamber 6 is provided with a flocculating agent dosing port 4. A volute aerator 5 is arranged in the aeration chamber 6. The cavitation aerator 5 is vertically arranged in the aeration chamber 6, and the bottom of the cavitation aerator 5 is provided with a hollow impeller. In the operation process, the cavitation aerator 5 forms a vacuum area in water through the rapid rotation of the hollow impeller at the bottom, at the moment, the air above is pumped to the bottom of the aeration chamber 6 through the hollow pipeline, the air is crushed into micro-bubbles under three shearing forces generated by the rapid rotation of the impeller at the bottom of the cavitation aerator 5, and the micro-bubbles are organically combined with solid pollutants in the fed sludge and rise to the liquid level. The bottom of the aeration chamber 6 is provided with a reflux device 8 consisting of a plurality of reflux pipes, in this embodiment three reflux pipes. Because the cavitation aerator 5 rotates at a high speed to form a vacuum area in the aeration chamber 6 to generate micro negative pressure, the water flow at the bottom of the cavitation air floating groove 12 is acted by the negative pressure, and the wastewater which is still not fully reacted is sucked into the aeration chamber 6 from a return pipe at the bottom of the cavitation air floating groove 12, so that the secondary circulation removal of sinking pollutants is realized. The top of the cavitation air flotation tank 12 is provided with a slag scraping device 9 driven by a motor, and the lower part of the slag scraping device 9 is provided with a scum collecting tank, a spiral slag discharging device and a discharging port 10. The slag scraping device 9 is made of stainless steel, rubber, high polymer and other materials. The concentrated sludge entering the spiral slag discharging device is conveyed to a subsequent process by the spiral slag discharging device for dehydration, and a sludge discharge hopper 7 is arranged at the bottom of the vortex concave air floating groove 12 and used for depositing sludge with higher density and discharging the sludge regularly. The rear end of the cavitation air flotation tank 12 is provided with an adjustable overflow weir plate 11 and a water outlet 13, and the adjustable overflow weir plate 11 is adjusted by a hand wheel or automatically adjusted. This embodiment is a hand wheel adjustment. The liquid level height of the overflow weir plate 11 can be adjusted by adjusting the concentration and the amount of the sludge to be treated. Clear liquid separated from solid and liquid moves forwards by gravity and flows to the adjustable overflow weir plate 11 at the rear end from the cavitation air flotation tank 12 to be discharged. The water outlet 13 is connected with an adjusting tank of the sewage treatment system through a pipeline. And waste gas overflowing from the sludge during the operation of the coagulation reaction tank 3 and the cavitation air flotation tank 12 is connected to a next treatment system through a pipeline.
The treatment process of the present embodiment includes the following steps:
A. conveying the residual sludge at the bottom of a secondary sedimentation tank of the sewage treatment system to a coagulation reaction tank 3, adding 20mg/L of foaming agent into the coagulation reaction tank 3, adding 8mg/L of cationic polyacrylamide serving as a flocculating agent, and stirring and coagulating the foaming agent and the residual sludge;
B. the coagulated sludge flows to a cavitation air flotation tank 12 by virtue of gravity, and a large amount of micro air generated by the cavitation air flotation tank 12 floats solid pollutants in the residual sludge to be treated on the liquid level;
C. the reflux device 8 inputs the waste water which is not fully reacted at the bottom of the cavitation air flotation tank 12 into the aeration chamber again;
D. the solid pollutants on the liquid surface are discharged to a subsequent dehydration system through a slag scraping device 9;
E. clear water is discharged through the middle adjustable overflow weir plate 11 and flows back to the adjusting tank of the sewage treatment system;
F. the sludge is discharged outside through a sludge discharge hopper 7 at the bottom of the cavitation air flotation tank 12.

Claims (4)

1. A cavitation air flotation device for sludge concentration comprises: the device is characterized in that the coagulation reaction tank and the cavitation air flotation tank are normal pressure containers, a feed inlet of the coagulation reaction tank is connected with a lift pump, the coagulation reaction tank is provided with a foaming agent feeding port, a stirrer is arranged in the coagulation reaction tank, an outlet of the coagulation reaction tank is connected with an inlet of the cavitation air flotation tank through a pipeline, an aeration chamber is arranged at the front end of the cavitation air flotation tank, a flocculating agent feeding port is arranged on the pipeline entering an inlet of the aeration chamber, a cavitation aerator is arranged in the aeration chamber, a reflux device consisting of a plurality of reflux pipes is arranged at the bottom of the aeration chamber, a slag scraping device driven by a motor is arranged at the top of the cavitation air flotation tank, the lower part of the slag scraping device is provided with a scum collecting tank, a spiral slag discharging device and a discharging port, the bottom of the cavitation air flotation tank is provided with a mud discharging hopper, the rear end of the cavitation air flotation tank is provided with an adjustable overflow weir plate and a water outlet, and the water outlet is connected with an adjusting tank of a sewage treatment system through a pipeline.
2. The cavitation air flotation device for sludge concentration according to claim 1, wherein the cavitation aerator is vertically installed in the aeration chamber, and a hollow impeller is provided at the bottom of the cavitation aerator.
3. The cavitation air flotation device for sludge concentration according to claim 1, characterized in that the adjustable overflow weir plate is hand wheel adjustment or automatic adjustment.
4. The cavitation air flotation device for sludge concentration according to claim 1, wherein the waste gas overflowing from the sludge during the operation of the coagulation reaction tank and the cavitation air flotation tank is connected to a next treatment system through a pipeline.
CN201920433519.7U 2019-04-01 2019-04-01 Cavitation air flotation equipment for sludge concentration Active CN209974593U (en)

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Application Number Priority Date Filing Date Title
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Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201920433519.7U CN209974593U (en) 2019-04-01 2019-04-01 Cavitation air flotation equipment for sludge concentration

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111204953A (en) * 2019-04-01 2020-05-29 麦王环境技术股份有限公司 Cavitation air flotation equipment for sludge concentration and treatment process

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111204953A (en) * 2019-04-01 2020-05-29 麦王环境技术股份有限公司 Cavitation air flotation equipment for sludge concentration and treatment process

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Address after: 200000, 4th floor, Block A, Oriental Fisherman's Wharf, 1088 Yangshupu Road, Yangpu District, Shanghai

Patentee after: Mai Wang Environmental Technology Co.,Ltd.

Country or region after: China

Address before: 4th Floor, Area A, Dongfang Fisherman's Wharf, No. 1088 Yangshupu Road, Yangpu District, Shanghai, 200082

Patentee before: MCWONG ENVIRONMENTAL TECHNOLOGY Co.,Ltd.

Country or region before: China