JP3051586U - Pressurized floating type wastewater treatment equipment - Google Patents

Abstract

(57) [Summary] (with correction) [PROBLEMS] To provide a pressurized floating type sewage treatment apparatus which requires a small amount of coagulant. SOLUTION: Floating separation tanks 2, 3 provided with an inflow part 5, a floating material scraping device 6, and a floating material recovery tank 7 are installed in two stages, upper and lower. A primary treated water tank 9 for introducing the treated water of the flotation tank 2 and a secondary treated water tank 14 for introducing the treated water of the flotation tank 3 are provided. A pipe 17 for introducing raw water from the raw water tank 15 into the upper inflow section 5 is provided. A pipe 18 is provided for sending the treated water in the flotation tank 2 from the flotation tank to the primary treated water tank. In the primary-treated water tank, the chemical mixed water mixed with the flocculant 8 is fed from the primary-treated water tank to the inflow portion 1 of the flotation / separation tank 3.
1 is provided with a pipe 19 for sending out. A pipe 21 for returning the treated water in the flotation tank 3 together with the pressurized air to the upper inflow section 5 again; A circulation pipe 26 for returning to the lower inflow section 11 is provided. A pipe is provided for sending the treated water from the flotation tank 3 to the secondary treated water tank. A discharge pipe 29 for discharging from the secondary treated water tank is provided.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a pressurized floating type sewage treatment apparatus for purifying pollutants contained in sewage such as domestic wastewater and organic factory wastewater.

[0002]

[Prior art]

 As shown in FIG. 2, the conventional pressurized floating type sewage treatment apparatus introduces raw water from a raw water tank 15 'into a flow-intake section 5' of a floating separation tank 1 'through a raw water introduction pipe 17' with a pump 16 '. ing. A coagulant 8 'is mixed during the introduction of the raw water into the inflow portion 5'. From the lower part of the flotation tank 1 ′, one of the treated water is sent out to the treated water tank 9 ′ by the treated water delivery pipe 18 ′, and discharged to the outside by the discharge pipe 29 ′, and the other is returned by the return pipe 21 ′. It is returned to the raw water introduction pipe 17 'by the pump 22' together with the pressurized air from the air supply pipe 23 ', and is introduced again into the inflow section 5'.

[0003] The pollutants contained in the raw water in the inflow section 5 'are attached to the bubbles generated by the introduction of pressurized air, and the particles of the pollutants are forcibly floated, and the pollutants are floated and separated. The floating material was scraped off by the floating material scraping device 6 'provided above the tank 1', collected in the floating material collecting tank 7 ', processed in the floating material processing tank 30', and then released.

[0004]

[Problems to be solved by the invention]

 When sewage such as domestic wastewater and organic factory wastewater is discharged directly into public waters, the organic matter in the sewage consumes dissolved oxygen in the water, causing suffocation of aquatic organisms, generation of toxic gas, or abnormal growth of algae. (Eutrophication of water bodies). Therefore, the polluted sewage must be removed before it is discharged into public waters to prevent environmental destruction.

[0005] As this sewage treatment method, a pressurized floating type sewage treatment apparatus is used in which fine bubbles are mixed into water, pollutants are attached to the bubbles, and solids in the water are floated and separated by the floating of the bubbles. Although a method has been conventionally adopted, according to this apparatus, a pollutant in water is flocculated using a flocculant or a coagulant. However, since the conventional apparatus mixes a coagulant or a coagulant into raw water, it requires a large amount of the coagulant or the coagulant as compared with the coagulation sedimentation method.

[0006] In view of the above, the present invention aims at providing a pressurized floating type sewage treatment apparatus which requires a small amount of coagulant or coagulant for coagulating pollutants in water and can obtain stable water quality. It is.

[0007]

[Means for Solving the Problems]

 In order to solve the above problems, the device of the present invention is provided with an inflow portion therein, a floating material scraping device provided above the water surface, and a floating device for collecting the floating material scraped by the floating material scraping device. Flotation tanks with material recovery tanks are installed in two stages, upper and lower, and primary treatment water tanks for introducing treated water from the upper separation tank and secondary treatment for introducing treated water from the lower separation tank. A fresh water tank is provided separately from the flotation tank, and the raw water introduction pipe for introducing the raw water from the raw water tank from the raw water tank to the inflow section in the upper flotation tank by a pump and the treated water from the upper flotation tank. The primary treated water delivery pipe from the flotation / separation tank to the primary treated water tank, and the chemical mixed water mixed with coagulant or coagulant in the primary treated water tank is floated and separated from the primary treated water tank via a stirrer at the lower stage. Chemical mixture to be sent to the inlet of the tank A return pipe, which returns the treated water from the lower flotation tank with the pressurized air from the lower flotation tank to the raw water introduction pipe by pumping, and returns it again to the inflow section of the upper flotation tank. A circulating pipe that branches off in the middle of the pipe and returns the treated water in the lower flotation tank to the inlet of the lower flotation tank together with pressurized air, and floats and separates the treated water in the lower flotation tank. It is characterized by comprising a secondary treated water delivery pipe for sending from the tank to the secondary treated water tank, and a discharge pipe discharged from the secondary treated water tank to the outside.

In the present invention having the above structure, raw water containing pollutants is introduced from the raw water tank into the inflow portion of the flotation tank above the raw water introduction pipe by the pump. Pressurized air pressurized into the return pipe enters the raw water introduction pipe from the middle of the raw water introduction pipe into the inflow section, and causes suspended matter in the raw water to adhere to bubbles generated by the compressed air at the inflow section. To the liquid surface and flow into the flotation tank. The floating material deposited on the upper part of the floating separation tank is collected in the floating material collecting tank by the scraping device and is processed in the floating material processing tank as before.

On the other hand, the clear treated water that has been subjected to the primary treatment in the upper flotation / separation tank is sent to the primary treated water tank via the primary treated water delivery pipe. In this primary treated water tank, a coagulant or coagulant is mixed with the primary treated water, and the primary treated water and the coagulant or coagulant are mixed by a stirrer while being sent through the chemical mixed water delivery pipe. Thereafter, the primary treated water mixed with the coagulant or coagulant is sent to the inflow portion of the lower flotation tank.

In the inflow section, pressurized air is sent from a return pipe into which pressurized air is injected and a circulating pipe branched from the return pipe, and primary treatment is performed by mixing a coagulant or a coagulant into bubbles generated by the pressurized air. The suspended solids remaining in the water are attached and carried to the liquid surface, and flow into the floating separation tank. The floating material deposited on the upper part of the floating separation tank is collected in a floating material collecting tank by a scraping device and processed in the floating material processing tank.

On the other hand, the clarified treated water that has been secondarily treated in the lower flotation tank is directly sent to the secondary treated water tank through the secondary treatment water delivery pipe, and discharged to the outside by the discharge pipe. Water, treated water sent to the inflow section of the upper flotation tank together with the pressurized air by the return pipe, and sent out to the inflow section of the lower flotation tank by the circulation pipe along with the pressurized air branched from the return pipe. Divided into treated water.

[0012] According to such an apparatus, in the upper flotation / separation tank, a substance which easily floats without using a flocculant or a coagulant is once floated and removed, and the flocculant or the coagulant is added to the treated water subjected to the primary treatment. Since the coagulant is mixed, the amount of the coagulant or coagulant can be reduced, and the water quality can be improved because the floating material is removed again.

[0013]

[Embodiment of the invention]

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a mechanical diagram showing an embodiment of the device of the present invention, and FIG. 2 is a mechanical diagram of a conventional device.

In the drawing, reference numeral 1 denotes an upper and lower two-stage type sewage treatment tank in which an independent upper-stage flotation tank 2 and a lower-stage flotation tank 3 are connected to each other. In the upper flotation / separation tank 2, an inflow portion 5 partitioned by a partition wall 4 is formed in the water, and a scraping conveyor 6 as a floating material scraping device is provided above the water surface. A floating material collecting tank 7 for collecting the collected floating material is provided at a rear portion outside the upper floating separation tank 2. Further, separately from the flotation tank 2, the primary treated water treated in the upper flotation tank 2 is introduced into the upper front part of the upper flotation tank 2, and the coagulant or coagulant 8 is mixed in the primary treated water tank. 9 are installed.

In the lower flotation / separation tank 3, an inflow portion 11 partitioned by a partition 10 is formed in water, and an impeller 12 as a floating object scraping device is provided above the water surface. A floating material collecting tank 13 for collecting the scraped floating material is provided at the rear of the lower floating separating tank 3 outside. Separately from the lower flotation tank 3, a secondary treated water tank 14 for introducing the secondary treatment water that has been treated in the lower flotation tank 3 is provided at the upper front of the lower flotation tank 3.

Reference numeral 15 denotes a raw water tank into which sewage such as domestic wastewater and factory wastewater is introduced. A pump 16 is provided in the raw water tank 15, and between the pump 16 and the inflow portion 5 of the flotation separation tank 2 in the upper stage. Is provided with a raw water introduction pipe 17. Reference numeral 18 denotes a primary treated water delivery pipe provided between the lower part of the upper floating separation tank 2 and the primary treated water tank 9. Reference numeral 19 denotes a chemical mixed water delivery pipe provided between the primary treated water tank 9 and the inflow portion 11 of the lower flotation / separation tank 3, and a stirrer 20 is provided in the middle of the chemical mixed water delivery pipe 19. .

Reference numeral 21 denotes a return pipe provided between the lower part of the flotation tank 3 and the raw water introduction pipe 17, and a pump 22 is provided in the middle. Reference numeral 23 denotes an air supply pipe provided in the middle of the return pipe 21, and pressurized air is pressed into the return pipe 21 by a pump 24. Reference numeral 25 denotes a valve provided in the return pipe 21.

Reference numeral 26 denotes a circulation pipe provided between the middle of the return pipe 21 and the inflow portion 11 of the lower flotation tank 3, and a return pipe from the lower part of the lower flotation tank 3 to the branch point of the return pipe 21. Share 21. 27 is a valve provided on the circulation pipe. Reference numeral 28 denotes a secondary treated water delivery pipe provided between the lower part of the lower flotation tank 3 and the secondary treated water tank 14, and 29 denotes a discharge pipe for discharging the secondary treated water tank 14 to the outside. Reference numeral 30 denotes a floating material processing tank for introducing a floating material from the floating material collecting tanks 7 and 13.

[0019]

[Effect of the invention]

 According to the present invention, in the upper flotation / separation tank, a substance that easily floats is temporarily removed without using a coagulant or a coagulant, and the coagulant or the coagulant is mixed into the treated water subjected to the primary treatment. Therefore, the consumption of the coagulant or coagulant is significantly reduced as compared with the conventional one mixed in raw water. In addition, since the separation of the floating material is performed in two stages, good quality water can be obtained. Conventional activated sludge treatment sedimentation tanks are difficult to settle, requiring a large area.In addition, coagulation sedimentation tanks are often installed in order to discharge water with good water quality even when the activated sludge treatment equipment itself is malfunctioning. However, by using the upper stage as a separation tank for activated sludge and the lower stage as a coagulation separation tank, it can be used as an activated sludge treatment device.

[Brief description of the drawings]

FIG. 1 is a mechanism diagram showing an embodiment of the present invention device.

FIG. 2 is a mechanism diagram of a conventional device.

[Explanation of symbols]

 2 Upper flotation / separation tank 3 Lower flotation / separation tank 5 Inflow section 6 Scraping conveyor 7 Floating matter collection tank 8 Coagulant 9 Primary treated water tank 11 Inflow section 12 Impeller 13 Floating matter collection tank 14 Secondary treated water tank 15 Raw water tank 16 Pumping pump 17 Raw water introduction pipe 18 Primary treatment water delivery pipe 19 Chemical solution mixed water delivery pipe 20 Stirrer 21 Return pipe 22 Pump 23 Air supply pipe 26 Circulation pipe 28 Secondary treatment water delivery pipe 29 Discharge pipe 30 Floating material treatment tank

Claims (1)

[Utility model registration claims] An inflow portion is provided therein, a floating object scraping device is provided above the water surface, and a floating material collecting tank for collecting the floating material scraped by the floating material scraping device is provided. The upper and lower flotation tanks are installed in the upper and lower stages. The raw water supply pipe is provided separately from the raw water tank to introduce the raw water from the raw water tank from the raw water tank to the inflow part in the upper flotation tank with the pump, and the treated water in the upper flotation tank is first treated from the flotation tank. The primary treated water delivery pipe to be sent to the treated water tank, and the chemical liquid mixed with coagulant or coagulant in the primary treated water tank is sent from the primary treated water tank to the inlet of the lower flotation tank via the stirrer. Chemical mixed water delivery pipe and floating separation at the bottom A return pipe for returning the treated water of the tank together with the pressurized air from the lower flotation tank to the raw water introduction pipe with a pump, and then returning it to the inflow section of the upper flotation tank again,
A circulating pipe that branches off in the middle of the return pipe and returns the treated water in the lower flotation tank to the inflow section of the lower flotation tank again with pressurized air, and floats and separates the treated water in the lower flotation tank. A pressurized floating type sewage treatment apparatus comprising: a secondary treated water delivery pipe for delivering from a tank to a secondary treated water tank; and a discharge pipe discharged from the secondary treated water tank to the outside.