CN209383545U - A kind of self-loopa negative pressure flotation sewage disposal system - Google Patents

Abstract

The utility model discloses a self-circulating negative pressure flotation sewage treatment system, which comprises a sewage pretreatment component, a flotation tank, a water injector and a return water feed pump; the sewage pretreatment component mixes sewage and chemical reagents and transports the sewage To the flotation tank, the sewage inlet pipe, return pipe, backflow dissolved air water inlet pipe and air suction port are set on the flotation tank, and the water injector is provided with a spray inlet, a spray outlet, a negative pressure suction port and a supplementary Air inlet; the outlet of the pretreatment assembly is connected to the sewage inlet pipe, the return pipe is connected to the inlet of the return water feed pump, the outlet of the return water feed pump is connected to the injection inlet, and the injection outlet is connected to the return flow The dissolved air water inlet pipe is connected, and the air suction port is connected with the negative pressure suction port. The utility model has simple structure, low energy consumption, and is beneficial to energy saving and environmental protection.

Description

A self-circulating negative pressure flotation sewage treatment system

technical field

The utility model relates to the field of industrial sewage treatment, in particular to a self-circulating negative pressure flotation sewage treatment system.

Background technique

The dissolved air flotation process is to inject or produce tiny bubbles in the wastewater, and then make these tiny bubbles collide with the flocs in the water and adhere to the flocs, so that the overall density is lower than the water and float up, and finally float on the surface of the liquid to be scraped The slag device is discharged out of the system. Dissolved air flotation can be divided into pressurized dissolved air method and vacuum dissolved air method according to the principle of generating bubbles. Pressurized dissolved air needs to dissolve a large amount of air under high pressure conditions, and release it in the form of microbubbles when the pressure suddenly drops to low pressure or normal pressure, so as to carry out air flotation treatment of wastewater.

The gas-dissolving process of the pressurized gas-dissolving method in the prior art needs to be carried out under high pressure, and the energy loss is large, which is not conducive to energy saving and environmental protection.

Vacuum dissolved gas method The gas dissolved process is carried out under normal pressure or low pressure conditions, while the gas release is carried out under negative pressure conditions. Compared with the pressurized dissolved air method, the vacuum dissolved air method does not require strong pressure, and the energy consumption is lower than that of the pressurized dissolved air flotation.

Utility model content

Purpose of the utility model: The purpose of this utility model is to provide a self-circulating negative pressure flotation sewage treatment system for the deficiencies of the prior art. Or under low pressure conditions, while the gas release is carried out under slightly negative pressure conditions, low energy consumption, simple structure, and conducive to energy saving and environmental protection.

Technical solution: A self-circulating negative pressure flotation sewage treatment system described in the utility model includes sewage pretreatment components, flotation tanks, water injectors and return water feed pumps; the sewage pretreatment components combine sewage with chemical The reagents are mixed and transported to the flotation tank. The sewage inlet pipe, return pipe, backflow dissolved air water inlet pipe and air suction port are arranged on the flotation tank. The water injector is provided with a spray inlet, a spray outlet, and a negative pressure suction port and supplementary air inlet; the outlet of the pre-treatment assembly is connected to the sewage inlet pipe, the return pipe is connected to the inlet of the backflow water feed pump, the outlet of the backflow water feed pump is connected to the injection inlet, and the The spray outlet is connected with the return flow dissolved air water inlet pipe, and the air suction port is connected with the negative pressure suction port.

A further preferred technical solution of the utility model is that the flotation tank includes an overflow clear water tank arranged on the upper part of the tank body and a scum collection box for collecting scum; the overflow clear water tank is arranged along the outer circumference of the tank The tank body is arranged in a circle, and the overflow clear water tank is provided with a purified water outlet pipe and a return pipe, and an overflow baffle is also arranged near the inner circle of the tank along the overflow clean water tank, and the scum collecting tank is provided with Inside the tank, the scum collecting box is provided with a scum outlet pipe for discharging scum.

Preferably, a stirring device is provided at the center of the tank body of the flotation tank; the upper end of the stirring device is connected to a stirring motor, and a slag scraper is provided on the upper part of the flotation tank, and the scum scraper is located at the upper port of the scum collection box The lower part of the stirring device is provided with a scraper, which is located at the bottom of the flotation tank.

Preferably, the center of the tank body of the flotation tank is provided with a central feeding tube, and the central feeding tube is connected to a collecting pipe; the inner end of the collecting pipe is connected to the central feeding tube, and its outer end extends to the outside of the flotation tank ; The outer end of the collection pipe is connected with a sewage inlet pipe and a return dissolved air water inlet pipe; the sewage inlet pipe is connected with the outlet of the sewage feed pump.

Preferably, the top of the tank body of the flotation tank is respectively provided with a pressure gauge, a vent pipe and an air suction port; the air suction port is connected with the negative pressure suction port of the water ejector, and the tank of the flotation tank The bottom of the body is provided with a sewage pipe for sewage discharge.

Preferably, the pre-treatment assembly includes a mixer, a dosing adjustment tank and a sewage feed pump; the sewage and chemical reagents are added to the mixer for mixing, and the outlet of the mixer is connected to the inlet of the dosing adjustment tank, so The outlet of the dosing adjustment tank is connected to the inlet of the sewage feed pump, and the outlet of the sewage feed pump is connected to the sewage inlet pipe of the flotation tank.

The working principle of the utility model is:

Add chemical agents and sewage to be treated into the mixer through the chemical dosing system. The chemical agents are preferably ferric chloride, coagulant, magnesium sulfate and sodium hydroxide, so that the chemical agents and sewage to be treated are mixed in the mixer After the mixed sewage is treated by the dosing adjustment tank, it is transported to the flotation tank by the sewage feed pump through the sewage inlet pipe; part of the reflux purified water in the flotation tank is returned to the reflux water feed pump through the reflux pipe, and the reflux water enters the flotation tank. The material pump will return the purified water through the injection inlet into the water jet for spraying; the water jet will generate a micro-vacuum area to suck the air in the flotation tank and the outside air due to the jet action of the water, and the flotation tank will suck the air in the flotation tank due to the suction of the water jet. The action produces a slight negative pressure, and the air inhaled by the water jet dissolves in the backflow purified water, mixes with the sewage to be treated, and then enters the flotation tank. The body and slick oil collide and adhere to float up, and finally float on the surface of the sewage, and are cleaned by the scum scraper into the scum collection box, and discharged out of the system through the scum outlet pipe.

Beneficial effects: (1) The utility model sprays and disperses the reflux purified water by setting a water jet, and the water jet forms a negative pressure in the jet due to the jet action, sucks the air in the flotation tank and part of the outside air, and the sucked air It can be efficiently dissolved in the reflux purified water, mixed with the sewage to be treated into the flotation tank for re-flotation separation; at the same time, due to the suction effect of the water jet, the flotation tank forms a slight negative pressure; the reflux solution entering the flotation tank The gas water and the sewage to be treated release gas under negative pressure conditions, producing fine air bubbles, which collide with flocs and oil slicks in the water, adhere to them and float up, and finally float on the surface of the sewage, and are cleaned into the scum collection box by the scum scraper, and passed through the scum collection box. The slag outlet pipe finally exits the system. The whole system of the utility model is simple in structure, low in energy consumption, effectively reduces the cost of sewage treatment, and realizes rapid separation of oil residue.

Description of drawings

Fig. 1 is the system structure schematic diagram of the present utility model;

Fig. 2 is a top view of the flotation tank described in the present invention.

Among them, 1. Flotation tank, 101, return pipe, 102, central feeding cylinder, 103, mud scraper, 104, overflow clear water tank, 105, slag scraper, 106, purified water outlet pipe, 107, sewage pipe , 108, emptying pipe, 109, stirring device, 110, pressure gauge, 111, scum collecting box, 112, overflow baffle, 113, oil residue outlet pipe, 114, sewage inlet pipe, 115, reflux dissolved air Water inlet pipe, 116, stirring motor, 117, manifold, 118, air suction port, 2, mixer, 3, dosing adjustment tank, 4, sewage feed pump, 5, return water feed pump, 6, water Ejector, 601, injection inlet, 602, injection outlet, 603, negative pressure suction inlet, 604, air inlet.

Detailed ways

The technical scheme of the utility model will be described in detail below with the accompanying drawings, but the protection scope of the utility model is not limited to the described embodiments.

Embodiment: A self-circulating negative pressure flotation sewage treatment system, including a sewage pretreatment assembly, a flotation tank 1, a water injector 6, and a return water feed pump 5; the pretreatment assembly includes a mixer 2, a dosing adjustment tank 3 and the sewage feed pump 4, the sewage inlet pipe 114, the return pipe 101, the backflow dissolved air water inlet pipe 115 and the air suction port 118 are arranged on the flotation tank 1, and the water injector 6 is provided with a spray inlet 601 and a spray outlet 602 , negative pressure suction port 603 and supplementary air inlet 604; sewage and chemical reagents are added into the mixer 2 for mixing, the outlet of the mixer 2 is connected to the inlet of the dosing adjustment tank 3, and the outlet of the dosing adjustment tank 3 is connected to the sewage inlet The inlet of the feed pump 4 is connected, the outlet of the sewage feed pump 4 is connected with the sewage inlet pipe 114 of the flotation tank 1; the return pipe 101 is connected with the inlet of the return water feed pump 5, and the outlet of the return water feed pump 5 is connected The inlet 601 is connected, the jet outlet 602 is connected with the return flow dissolved air water inlet pipe 115 , and the air suction port 118 is connected with the negative pressure suction port 603 .

The further preferred technical solution of the utility model is that the flotation tank 1 includes an overflow clear water tank 104 arranged on the top of the tank body and a scum collecting box 111 for collecting scum; the overflow clear water tank 104 is arranged along the outer circumference of the tank. Cloth the tank body of a circle, the overflow clean water tank 104 is provided with the purified water outlet pipe 106 and the return pipe 101, the overflow clean water tank 104 is also arranged with an overflow baffle plate 112 near the inner circle of the tank, and the scum collecting box 111 is provided with Inside the tank body, the scum collecting box 111 is provided with a scum outlet pipe 113 for discharging scum;

The center of the tank body of the flotation tank 1 is provided with a central feeding cylinder 102, and the central feeding cylinder 102 is connected with a collecting pipe 117; the inner end of the collecting pipe 117 is connected with the central feeding cylinder 102, and its outer end extends to the outside of the flotation tank 1; The outer end of the collecting pipe 117 is connected with a sewage inlet pipe 114 and a reflux dissolved air water inlet pipe 115; the sewage inlet pipe 114 is connected with the outlet of the sewage feed pump 4; Empty pipe 108 and air suction port 118; Air suction port 118 is connected with the negative pressure suction port 603 of water injector 6;

The center of the tank body of the flotation tank 1 is provided with a stirring device 109; the upper end of the stirring device 109 is connected with the stirring motor 116, and the top of the stirring device 109 is provided with a slag scraper 105, and the scum scraper 105 is located at the upper port of the scum collecting box 111, The floating scum is scraped into the inside of the scum collecting box 111, and then the scum is discharged out of the tank through the scum outlet pipe 113; The bottom of the tank body of the flotation tank 1 is provided with a blowdown pipe 107 for blowdown, and the mud scraper 103 discharges the sludge that sinks into the bottom of the flotation tank 1 through the blowdown pipe 107 to the outside of the tank body.

The working principle of the utility model is:

Add chemical agent and sewage to be treated in mixer 2 through chemical dosing system, chemical agent is preferably ferric chloride, coagulant, magnesium sulfate and sodium hydroxide, make chemical agent and sewage to be treated in mixer 2 internal mixing, the mixed sewage is treated by the dosing adjustment tank 3, and then transported to the flotation tank 1 by the sewage feed pump 4 through the sewage inlet pipe 114; part of the reflux purified water in the flotation tank 1 is refluxed to the flotation tank 1 through the reflux pipe 101. The flowing water feed pump 5 and the reflux water feed pump 5 inject the reflux purified water into the water injector 6 through the injection inlet 601 for injection; the water injector 6 generates a micro-vacuum area to suck the air in the flotation tank 1 due to the injection of water And outside air, the flotation tank 1 produces micro-negative pressure due to the suction of the water jet 6, and the air sucked by the water jet 6 dissolves in the backflow purified water and mixes with the sewage to be treated and re-enters the flotation tank 1. Under the condition of negative pressure in tank 1, the dissolved air releases gas to produce fine bubbles, which collide with flocs and slick oil in the water, adhere to them and float up, and finally float on the surface of the sewage, where they are cleaned by the scum scraper 105 and enter the scum collection box 111. An outlet tube 113 exits the system.

As stated above, although the invention has been shown and described with reference to certain preferred embodiments, this should not be construed as limiting the invention itself. Various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (6)

1. a kind of self-loopa negative pressure flotation sewage disposal system, it is characterised in that: including sewage pre-treatment component, floatation cell, water Injector and recirculation water feed pump；Sewage is mixed with chemical reagent and is delivered to floatation cell, institute by the sewage pre-treatment component It states and sewage induction pipe, return pipe, reflux dissolved air water inlet tube and air suction inlet is set on floatation cell, the water ejector setting There are setting injection entrance, jet exit, negative pressure suction inlet and supplement air intake；The outlet of the pre-treatment component and sewage into Mouth pipe connection, the return pipe are connect with the import of recirculation water feed pump, the outlet of the recirculation water feed pump and injection entrance Connection, the jet exit are connect with reflux dissolved air water inlet tube, and the air suction inlet is connect with negative pressure suction inlet.

2. a kind of self-loopa negative pressure flotation sewage disposal system according to claim 1, it is characterised in that: the floatation cell Dross collecting box including being set to the overflow Rinsing Area on tank body top and for collecting dross；The overflow Rinsing Area is along tank The groove body of external one circle of circumference arrangement, the overflow Rinsing Area are equipped with treated water outlet pipe and return pipe, the overflow Rinsing Area It closes on and is also placed with overflow baffle along tank body inner ring, the dross collecting box is on the inside of tank body, the dross collecting box Equipped with the dross outlet for dross to be discharged.

3. a kind of self-loopa negative pressure flotation sewage disposal system according to claim 2, it is characterised in that: the floatation cell Tank body center at be provided with agitating device；The upper end of the agitating device is connect with stirring motor, and upper part is equipped with Slag Scraping Device, The Slag Scraping Device is located at the upper port of dross collecting box, and the agitating device lower part is equipped with mud scraper, positioned at floatation cell Tank base.

4. a kind of self-loopa negative pressure flotation sewage disposal system according to claim 1, it is characterised in that: the floatation cell Tank body be provided centrally with central feeding cylinder, the central feeding cylinder is connected with concetrated pipe；The concetrated pipe inner end connection center Feeding cylinder, it is external that outer end extends to floatation cell；The concetrated pipe outer end is connected with sewage induction pipe and reflux dissolved air water import Pipe；The sewage induction pipe is connect with sewage charging pump discharge.

5. a kind of self-loopa negative pressure flotation sewage disposal system according to claim 1, it is characterised in that: the floatation cell Top of the tank be respectively equipped with pressure gauge, blow-down pipe and air suction inlet；The negative pressure of the air suction inlet and water ejector is inhaled Entrance connection, the tank base of the floatation cell are equipped with the sewage pipe for blowdown.

6. a kind of self-loopa negative pressure flotation sewage disposal system according to claim 1, it is characterised in that: the pre-treatment Component includes mixer, chemicals addition control tank and sewage feed pump；Sewage is added in mixer with chemical reagent and is mixed, institute The outlet for stating mixer is connect with the import of chemicals addition control tank, and the outlet of the chemicals addition control tank and the import of sewage feed pump connect It connects, the outlet of the sewage feed pump is connect with the sewage induction pipe of the floatation cell.