JP2009183834A - Waste water treatment apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To attain improvement in treatment efficiency by an aeration tank as well as improvement in floating-up separation efficiency of fats and oils without using a chemical. <P>SOLUTION: The waste water treatment apparatus includes: a grist lap 3 where fats and oils in the primary waste water exhausted from a factory, a cookroom or the like are stuck to bubbles, so as to be floated up; and an aeration tank 5 where the secondary waste water from the grist lap 3 is treated with bacteria, wherein the waste water in the grist lap 3 is pumped up by a circulation pump 7, and is fed to a pressure regulation device 41 together with the air taken from the inside of the atmosphere. The waste water together with the air fed by the circulation pump 7 is collided against a waste water collision part 63 under pressure conditions in the pressure regulation device 41, so as to form numberless small bubbles, and, regarding the small bubbles and the waste water including a large quantity of oxygen, from an outflow port 45, either is discharged to the grist lap 3, and the other is discharged to the aeration tank 5, respectively. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a wastewater treatment apparatus suitable for wastewater containing a large amount of oil and fat.

  Conventionally, wastewater containing a large amount of oils and fats from factories and kitchens has problems such as generating a unique odor, clogging sewage, and becoming a hotbed of pests. It is obliged to treat fats and oils by the strap.

  The grease trap is a means for separating oil and fat from the wastewater, and this separation means attaches the oil and fat to the bubbles in the wastewater and floats and separates them, for example, by introducing a chemical into the greasetrap. ing.

  The floating separation of fat and oil greatly depends on the relationship with bubbles. In particular, experiments have confirmed that the adhesion efficiency with oils and fats is poor when the bubble diameter is large, and the adhesion efficiency improves as the bubble diameter decreases.

  Bubbles are generally created by sending air into the waste water by a pump, but the current situation is that the bubble diameter is large and the separation efficiency is poor even when a chemical is used. In addition, there are problems such as high costs.

  Therefore, an object of the present invention is to provide a wastewater treatment apparatus capable of improving the treatment efficiency of an aeration tank in combination with the improvement of the floating separation efficiency of oil and fat without using chemicals.

  In order to achieve the above object, in the present invention, a grease trap that floats by attaching oil and fat in the primary wastewater drained from a factory, kitchen, etc. to the bubbles, and secondary drainage from the grease strap. An aeration tank to be treated with bacteria, and a circulation pump for pumping waste water from the grease trap and feeding the pumped waste water and air taken in from the atmosphere into the pressure regulator, Drainage that collides with the inlet with which the wastewater is sent by the circulation pump, the valve body that contacts the valve seat of the inlet with the spring pressure of the urging spring, and the wastewater with the air that is sent from the inlet by the circulation pump It has a collision part and the outflow port which discharges the waste_water | drain collided with the drainage collision part into the said grease trap and an aeration tank, respectively.

  According to the present invention, the drainage together with the air fed by the circulation pump is increased to the pressure set at the inlet of the pressure regulator, and collides with the drainage collision part vigorously in a state where a large kinetic energy is given. Innumerable small bubbles can be made.

  One of the wastewater containing countless small bubbles can be discharged from the outlet to the grease trap and the other to the aeration tank.

  As a result, in the grease trap, the adhesion ratio with the oil and fat is improved by countless small bubbles without using a chemical, and the separation and floating of the oil and fat can be greatly improved.

  On the other hand, in the aeration tank, wastewater containing a large amount of oxygen is sent in, so that degradation by bacteria is promoted and degradation can be improved.

  The improvement of the degradation process by bacteria is supported by experimental data and is not theoretically elucidated, but one is that bacteria are more activated by oxygen that is sent in large quantities as small bubbles. It is thought that this may be because the wastewater component in the wastewater collides with the drainage collision part, so that it is crushed to a state where it is taken up by bacteria and easily decomposed. It is considered.

  Hereinafter, embodiments of the present invention will be specifically described with reference to FIGS. 1 to 6.

  FIG. 1 is an overall explanatory view showing a waste water treatment apparatus according to the present invention.

  The waste water treatment apparatus 1 includes a grease trap 3, an aeration tank 5, and a circulation pump 7.

  The grease strap 3 is a place where oil or fat is removed from wastewater containing a large amount of oil or fat discharged from a factory or kitchen, for example, in a factory, it is commensurate with the amount of treatment from a raw water tank that is temporarily stored. Drainage is sent by the drain pipe 9 by a certain amount. The grease strap 3 is provided with a fat / oil removing device 11 that removes the oil / fat that has been floated and separated, and a drainage extraction compartment 14 that is partitioned by an oil / fat partition wall 12 that partitions the floated fat / oil. Is communicated with the inside of the tank through a communication port below the oil partition wall 12.

  For example, a rotating scraping blade 15 is provided in a gathering chamber 13 where the foamed fat and oil components adhering to air bubbles and separated by floating are collected by overflow, and the fat collecting device 11 is scraped and collected by the rotation of the collecting blade 15. The structure is configured to discharge the foamy oil and fat from the discharge path 17.

  The fats and oils collected in one place by the drainage channel 17 are absorbed by a vacuum car and then transported to an industrial waste disposal site for processing.

  The aeration tank 5 communicates with the drainage discharge compartment 14 of the grease strap 3 via the water distribution pipe 16, and decomposes the sewage components in the waste water primarily treated by the grease strap 3 with bacteria. An air supply pump 19 for feeding air to the water and a drain pipe 20 for draining treated water decomposed by bacteria to the outside.

  In addition to sending air into the aeration tank 5 as described above, the air supply pump 19 has a function of circulating waste water in the tank by the injection pressure from the injection port 19a.

  As shown in FIG. 5, the circulation pump 7 includes a manual inverter 24 provided with a knob 24 a that is adjusted stepwise, and a rotating blade 27 is provided in a casing 25 having an inlet 21 and an outlet 23. The rotary vane 27 has a function of forcibly discharging the waste water taken in from the inlet 21 by the rotation from the outlet 23, and is fixed integrally to the rotor shaft 35. The rotor shaft 35 is provided on a stator 31 that is fixedly supported by a motor frame 29 that constitutes an electric part, and a rotor 33 that rotates when a current flows through the stator 31, and rotational power is given by the rotor 33.

  The inlet 21 of the circulation pump 7 is provided with a suction pipe 37 for taking in drainage from a position near the bottom of the drainage partitioning compartment 14 of the grease strap 3 and an air inlet 39 for taking in air from the atmosphere. ing.

  The air intake 39 is formed by raising a pipe from the suction pipe 37 close to the inlet 21, and the suction pressure toward the inlet 21 acts when the rotary blade 27 rotates, so that air can be easily introduced from the atmosphere without cost. Can be taken in. In this case, the air intake 39 can be provided on the outlet 23 side of the circulation pump 7. In the case of this embodiment, since the discharge pressure acts on the outlet 23 side, it is necessary to forcibly feed using a pump.

  On the other hand, the outlet 23 of the circulation pump 7 is connected to the inlet 43 of the pressure regulator 41 as shown in FIG.

  The pressure adjusting device 41 includes an inflow port 43, an outflow port 45, and a valve body 47 in the main body case 41 a, and the outflow port 45 is provided in a direction orthogonal to the central axis X passing through the inflow port 43.

  The outlet 45 is connected to an outlet pipe branched from the middle, and one of the outlets branched as shown in FIG. 1 is connected to the grease strap 3 via the first pipe 49, and the other is connected to the second pipe 51. Via the aeration tank 5. The first pipe 49 is for circulation in which a part of the drainage in the grease trap 3 circulates through the suction pipe 37 of the circulation pump 7.

  As shown in FIGS. 2 and 3, the valve body 47 is in contact with the valve seat 43 a of the inlet 43 by the spring pressure of the biasing spring 53. The spring pressure V1 of the urging spring 53 and the pressure V of the inflow port 43 have a relationship of V1 = V. The pressure V of the inflow port 43 is determined by the spring pressure V1 of the urging spring 53, and The pressure is controlled and managed by a pressure gauge 55 provided at the outlet 23 of the circulation pump 7.

  One of the urging springs 53 is supported by the main cylinder 57 of the valve body 47, and the other is supported by a spring support body 59, and the spring support body 59 is pressed by an adjustment screw 61.

  The adjusting screw 61 has a threaded portion 61 a screwed into the main body case 41 a of the pressure adjusting device 41, and its tip is in contact with the spring support 59. The operating portion 61b of the adjusting screw 61 is outside, and the operating portion 61b can be moved forward, for example, by rotating it to the right to increase the spring pressure of the biasing spring 53.

  Further, by rotating to the left, it is possible to move backward and weaken the spring pressure of the biasing spring 53, and the valve body 47 can move forward or backward relative to the valve seat 43a in relation to the pressure from the inlet 43. It becomes.

  On the other hand, a drainage collision part 63 is provided between the valve body 47 and the main cylinder 57 on the upstream side of the outlet 45. The drainage collision part 63 is formed in a disk shape, and the drainage discharged from the inlet 43 through the valve body 47 collides with the drainage collision part 63, and then the flow toward the outlet 45 is secured. Yes.

  In this case, the valve body 47 is provided with a plurality of passage grooves 65 along the central axis X on the outer peripheral surface of the valve body 47 as shown in FIG. It is desirable to use a means for creating a combined flow that collides with the portion 63.

  Further, it is desirable that the main body case 41a can be easily assembled and maintained by the valve body 47 and the urging spring 53 by loosening the screw portion 64.

  According to the waste water treatment apparatus 1 configured as described above, the waste water together with the air fed by the circulation pump 7 is vigorous with the waste water collision part 63 in a state where a large kinetic energy is given at the inlet 43 of the pressure regulator 41. Countless small bubbles are made by colliding well.

  One of the wastewater containing innumerable small bubbles is discharged from the outlet 45 to the grease strap 3, and the other is discharged from the outlet 45 to the aeration tank 5, respectively. At this time, in the grease strap 3, a part of the drainage circulates through the suction pipe 37 → the circulation pump 7 → the first pipe 49.

  As a result, in the grease strap 3, the adhesion rate of fats and oils is improved by innumerable small bubbles without using chemicals, and separation and floating of the fats and oils are greatly improved.

  On the other hand, in the aeration tank 5, the decomposition process by the activated bacteria is accelerated | stimulated by the waste_water | drain containing much oxygen being sent.

  FIG. 6 shows the experimental results, in which SS (sewage): A, BOD (oxygen supply amount): B, and N-HEX (oil): C were examined. The legal reference values for each A: B: C are A: 600, B: 600, and C: 30 (mg / l). On the other hand, when the raw water of A (460 mg / l), the raw water of B (940 mg / l) and the raw water of C (140 mg / l) were passed, the water discharge values were A: 44 mg / l, B: 15 mg / l, C : 0 mg / l, and the results were greatly improved.

  Although this is not theoretically clarified, it is because bacteria are activated by a large amount of oxygen due to small bubbles and that sewage components in the waste water are crushed into a state that is easily decomposed by bacteria at the time of collision. Conceivable.

BRIEF DESCRIPTION OF THE DRAWINGS Outline explanatory drawing of the whole waste water treatment equipment concerning the present invention. An outline sectional view which expanded a pressure regulation device. The schematic perspective view which showed the valve body and drainage collision part of the pressure regulator. The outline expansion explanatory view showing the arrangement relation of a circulation pump and a pressure regulation device. The schematic explanatory drawing which showed the cross section of the circulation pump. Explanatory drawing which shows the experimental result of SS, BOD, and N-HEX.

Explanation of symbols

DESCRIPTION OF SYMBOLS 3 ... Grease strap 5 ... Aeration tank 7 ... Circulation pump 21 ... Inlet 23 ... Outlet 41 ... Pressure regulator 43 ... Inlet 45 ... Outlet 47 ... Valve body 53 ... Energizing spring 63 ... Drainage collision part

Claims (1)

  A grease trap that floats the oil and fat in the primary wastewater drained from the factory, kitchen, etc. by adhering to the bubbles, an aeration tank that treats the secondary wastewater from the grease strap with bacteria, and pumps wastewater from the grease strap. A circulating pump that feeds the drained water pumped up and pumped into the pressure adjusting device together with air taken in from the atmosphere, and the pressure adjusting device includes an inlet port through which the waste water is fed by the circulating pump, and a biasing spring. The valve body that contacts the valve seat of the inlet by spring pressure, the drainage collision part that collides with the wastewater together with the air fed from the inlet by the circulation pump, and the drainage that collides with the drainage collision part A wastewater treatment apparatus having an grease outlet and an outlet for discharging into the aeration tank.

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