Magnetic Agglregation Agent Added Water Treatment Device

Abstract

Provided is a water treatment apparatus capable of downsizing a biological reaction tank apparatus by combining a nitrification inhibition tank and a nitrification promotion tank unit corresponding to fluctuations in water quality and quantity of treated water, and simultaneously efficiently treating SS, BOD, nitrogen components, etc. 【Solution means】The magnetic coagulant-added water treatment apparatus mainly comprises a magnetic coagulant dispenser 1, a primary nitrification inhibition tank 4, a primary nitrification promotion tank 5, a secondary nitrification inhibition tank 6, a secondary nitrification promotion tank 7, a high-speed coagulation sedimentation tank 8, and further, an upward flow fiber filter 11 for advanced treatment is connected according to conditions. An external magnetic field generator is provided at the lower part of the outer wall of the high-speed coagulation sedimentation tank 8, and the flocs containing magnetic substances can be rapidly sedimented by magnetic force and separated without relying on gravity sedimentation, so that a large sedimentation tank and long-distance piping are unnecessary.

Description

Technical Field

[0001] The present invention relates to a water treatment apparatus that can downsize a biological reaction tank device by combining a nitrification inhibition tank and a nitrification promotion tank unit corresponding to fluctuations in the quality and quantity of treated water, and can efficiently treat SS, BOD, nitrogen components, etc.

Background Art

[0002] The conventional activated sludge treatment method is a biological treatment method that uses a process in which microorganisms decompose organic substances contained in sewage. In this system, by supplying air (oxygen) to the biological reaction tank, microorganisms such as bacteria and chlorophyll ingest and decompose organic substances to obtain purified water, and excess sludge is discarded after dehydration treatment. A treatment system of primary treatment (initial sedimentation) → activated sludge treatment → secondary treatment (secondary sedimentation tank) → tertiary treatment (filtration treatment, membrane treatment) is generally known.

[0003] In addition, in the activated sludge treatment system, which is a conventional treatment system, it is necessary to supply a large amount of oxygen for the activated sludge treatment, which requires a lot of energy, and the installation area for installing the treatment system becomes large. In large-scale treatment facilities, the treatment capacity and treatment speed are bottlenecks at present.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] The present invention provides a water treatment apparatus which is provided with a dispenser capable of intermittently flowing a powdery magnetic coagulant into a bypass circuit at the sewage inlet of a biological reaction tank, injects the magnetic coagulant according to the inflow water volume and water quality, and is provided with a nitrification inhibition tank and a nitrification promotion tank unit. A fluidized carrier type reaction section filled with floating fiber contact materials is provided in the nitrification promotion tank to enhance the aerobic reaction tank function.

Means for Solving the Problems

[0006] The present invention has been made in view of the above problems, and the magnetic coagulant-added water treatment apparatus according to claim 1 is a water treatment apparatus, which includes a dispenser provided at the raw water inlet for injecting a coagulant containing a powdery magnetic material, a primary nitrification inhibition tank having a stirrer, a primary nitrification promotion tank connected to the primary nitrification inhibition tank and provided with a fluidized carrier type reaction section filled with floating fiber contact materials, a secondary nitrification inhibition tank connected to the primary nitrification promotion tank and having a stirrer, a secondary nitrification promotion tank connected to the secondary nitrification inhibition tank and provided with a fluidized carrier type reaction section filled with floating fiber contact materials, and a sedimentation tank connected to the secondary nitrification promotion tank for sedimenting flocs. It is a magnetic coagulant-added water treatment apparatus characterized by having these components.

[0007] Moreover, the invention according to claim 2 is the magnetic coagulant-added water treatment apparatus according to claim 1, characterized in that an external magnetic field generator is attached to the lower part of the outer wall of the sedimentation tank to forcibly sediment and separate the flocs containing magnetic materials by magnetic force.

[0008] Moreover, the invention according to claim 3 is the magnetic coagulant-added water treatment apparatus according to claim 1, characterized in that an upward flow fiber filter for promoting filtration is provided and connected to the sedimentation tank.

Effects of the Invention

[0009] The magnetic coagulant-added water treatment apparatus of the present invention is very effective for system downsizing. The reasons are as follows. First, the improvement of high-efficiency coagulation and sedimentation treatment can be mentioned. Since the magnetic coagulant has a greater sedimentation property compared to ordinary coagulants, it can form quick and strong flocs. Also, due to this coagulation effect, the sedimentation rate can be improved and the residence time in the reaction tank can be shortened compared to the conventional type, enabling a smaller apparatus to obtain water quality equivalent to or better than the conventional treatment, thus allowing for downsizing.

[0010] Second, the fact that forced separation by a magnetic field is possible can be mentioned. By using a coagulant containing a magnetic substance, sedimented sludge can be quickly recovered by an external magnetic field, and separation can be achieved without relying on gravitational sedimentation, eliminating the need for a large sedimentation tank and long-distance piping.

[0011] Third, the simplification of the treatment can be mentioned. In ordinary physical and chemical treatments, multiple processes (pH adjustment, reaction, sedimentation) are required, but the method using a magnetic coagulant can simplify the system, thereby also reducing the footprint (installation area) of the entire apparatus.

[0012] Fourth, the removal of nitrogen, phosphorus, etc. is also possible and the removal rate is high, enabling both the merits of space saving and high efficiency to be obtained.

[0013] Also, the advantages of using a magnetic coagulant are as follows. First, high-efficiency removal is possible. This is because by using a coagulant containing a magnetic substance, very fine particles and suspended matter can be surely removed with high efficiency, enabling the downsizing of the treatment apparatus.

[0014] Second, the improvement of sedimentation property. The magnetic coagulant has a large specific gravity, and sludge can be sedimented, separated, and recovered quickly and easily by an external apparatus magnetic field.

[0015] Third, the improvement of sludge dewaterability and recyclability: The magnetic substance-containing coagulant improves sludge dewaterability, and the recycled use of the recovered sludge is easy, making it an environmentally friendly system.

[0016] Note that this magnetic coagulant technology is very effective when the pollutants are fine and difficult to remove by ordinary treatment methods.

Brief Description of the Drawings

[0017]

Figure 1

Figure 2

Figure 3

Embodiments for Carrying Out the Invention

[0018] Hereinafter, embodiments of the present invention will be described with reference to the drawings. The magnetic coagulant-added water treatment apparatus mainly consists of a magnetic coagulant dispenser 1, a primary nitrification inhibitor tank 4, a primary nitrification promoter tank 5, a secondary nitrification inhibitor tank 6, a secondary nitrification promoter tank 7, and a high-speed coagulation sedimentation tank 8. Further, an upward flow fiber filter 11 for advanced treatment is also connected according to conditions.

[0019] As shown in FIG. 1, a part of the primary treated water A is sent as raw water bypass water B to the magnetic coagulant dispenser 1, and the rest is sent to the primary nitrification inhibitor tank 4 and stirred by a stirrer 2. In the magnetic coagulant dispenser 1, a magnetic coagulant, which is a cationic, nonionic, or amphoteric copolymer powder coagulant, is intermittently added in a predetermined volume to be mixed into the primary nitrification inhibitor tank 4 as magnetic coagulant mixed water C and stirred. As a result, the sedimentation property becomes larger compared with ordinary coagulants, so that a quick and strong floc can be formed. Further, due to this coagulation effect, the sedimentation rate can be improved and the residence time of the reaction tank can be shortened compared with the conventional type. In addition, by adding a magnetic coagulant, it is possible to prevent the occurrence of trouble due to the inflow water volume, inflow water quality, and operation mistakes, and to solve the treatment trouble at an early stage.

[0020] The primary treated water A stirred in the primary nitrification inhibitor tank 4 is sent to the primary nitrification promotion tank 5, and microorganisms decompose the organic matter contained in the sewage by the biological treatment method. An oxygen supply aeration blower 3 is provided to promote decomposition. Since flocs have already been formed by the magnetic coagulant in the primary nitrification inhibitor tank 4, the burden of biological treatment is reduced, and as a result, it can contribute to shortening the treatment time and downsizing the equipment.

[0021] After that, the water treatment is further promoted by a secondary nitrification inhibitor tank 6 and a secondary nitrification promotion tank 7 having the same configuration as the primary nitrification inhibitor tank 4 and the primary nitrification promotion tank 5. Note that this nitrification inhibitor tank and nitrification promotion tank can be used as one unit, and this unit can be further connected according to the amount of treated water and the scale of the treatment site. That is, by flexibly combining the nitrification inhibitor tank and the nitrification promotion tank as one unit in response to fluctuations in the SS and COD concentrations of the inflowing sewage, downsizing of the entire device can be achieved.

[0022] The primary treated water A that has passed through the secondary nitrification inhibitor tank 6 causes the flocs containing the magnetic coagulant to precipitate and separate in the high-speed coagulation sedimentation tank 8. An external magnetic field generator (magnetic body) is provided at the lower part of the outer wall of the high-speed coagulation sedimentation tank 8, and the flocs containing the magnetic body can precipitate rapidly by magnetic force and can be separated without relying on gravitational sedimentation, which has the advantage of eliminating the need for a large sedimentation tank and long-distance piping.

[0023] The treated water that has passed through the high-speed coagulation sedimentation tank 8 is sent to the secondary treated water tank 9 as secondary treated water F, and then further filtered highly by the upward flow fiber filter 11 to be used as highly treated water H for treatment or reused water 12. The results of the treated water showed that the device was very effective as shown in Figure 3.

Industrial Applicability

[0024] The magnetic coagulant-added water treatment device of the present invention is small in size, can obtain water quality equivalent to or better than that of conventional treatment, and can be downsized, so it is applicable to water treatment plants of various scales.

Explanation of Symbols

[0025] 1 Magnetic Agglomerant Dispenser 2 Stirrer 3 Oxygen Supply Aeration Blower 4 Primary Nitrification Inhibitor Tank 5 Primary Nitrification Promoter Tank 6 Secondary Nitrification Inhibitor Tank 7 Secondary Nitrification Promoter Tank 8 High-Speed Agglomeration Sedimentation Tank 9 Secondary Treatment Water Tank 10 Low-Pressure Filtration Pump 11 Upflow Fiber Filter 12 Reclaimed Water A Primary Treated Water B Raw Water Bypass Water C Magnetic Agglomerant Mixed Water D Aeration Air Supply E Fiber Contact Material Air Cleaning Pipe F Secondary Treated Water G Fiber Filtration Raw Water H Advanced Treated Water I Magnetic Agglomerant Circulation (Return Sludge)

Claims

1. A water treatment apparatus, a dispenser provided at the raw water inlet for injecting a coagulant containing a powdery magnetic substance, a primary nitrification inhibition tank having a stirrer, a primary nitrification promotion tank connected to the primary nitrification inhibition tank and provided with a fluidized carrier type reaction section filled with floating fiber contact materials, a secondary nitrification inhibition tank connected to the primary nitrification promotion tank and having a stirrer, a secondary nitrification promotion tank connected to the secondary nitrification inhibition tank and provided with a fluidized carrier type reaction section filled with floating fiber contact materials, a sedimentation tank connected to the secondary nitrification promotion tank for sedimenting flocs, characterized by comprising a magnetic coagulant-added water treatment apparatus.

2. The magnetic coagulant-added water treatment apparatus according to claim 1, characterized in that an external magnetic field generator is attached to the lower part of the outer wall of the sedimentation tank to forcibly sediment and separate flocs containing a magnetic substance by magnetic force.

3. The magnetic coagulant-added water treatment apparatus according to claim 1, characterized in that an upward flow fiber filter for promoting filtration is provided and connected to the sedimentation tank.

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