KR19980033651A - Sand microbial contact abatement method - Google Patents

Abstract

The BIO-SAND CONTACT AERATION SYSTEM of the present invention is installed in a biological treatment process for the purpose of preventing the loss of microorganisms in aeration tank of conventional biological waste water treatment or securing a certain amount of various microorganisms It is a new type of microbial contact abatement method that can replace the plastic type product of microbial material, BIO-fiber (aka HBC) and other RBC method which are made of polyethylene or polyvinylidene yarn, and this system uses natural product sand As a new method model that can be processed with high efficiency, it prevents problems when installing various artificial contact materials. According to the present invention, it is possible to stably improve the treatment efficiency while reducing the construction cost of the waste water treatment facility.

Description

Sand microbial contact abatement method

The BIO-SAND CONTACT AERATION SYSTEM of the present invention aims at enhancing the treatment efficiency of the most important aeration tank in biological wastewater treatment process, reducing construction cost, and facilitating stable treatment and operation management.

Most of the organic waste water and wastewater is treated by cultivating a large amount of aerobic microorganisms in the wastewater, and the microorganisms absorb and decompose organic matter and convert them into final CO ₂ gas and water (H ₂ O). Thus, the process of digesting organic matter by culturing a large amount of microorganisms is abandoned. In addition, a new wastewater flows into and out of the aeration tank at the same time. Since the microorganisms flow out together with the effluent wastewater, they are operated by sludge returning operation or microorganism contact material in the aeration tank in order to secure certain microorganisms in the aeration tank. In recent years, it has not been easy to control the amount of sludge to be conveyed.

The contact material was developed according to the method of installation, the RBC-ROTATING BIO LOGICAL CONTACTOR and the FIXED MEDIA AERATION. The contact oxidation method was developed by HBC method (HANGING BIO CONTACTOR) And a method of injecting a plastic product such as the fluidized bed, the semi-fluidized bed, or the fixed bed, as shown in FIG.

These conventional contact oxidation methods each have advantages and disadvantages, and the major disadvantages are as follows.

First, when excessive organic matter is loaded, the microorganisms are excessively proliferated and clogging phenomenon occurs between the mediums. When the temperature is low, the microorganisms adhered to the medium are desorbed and it takes much time to restart.

Second, since the microorganisms attached to the medium grow more than 35 mm in diameter, it is difficult to supply oxygen to the microorganisms adhered to the inside of the medium. Therefore, anaerobic bacteria appear and anaerobic digestion releases odor gases such as CH ₄ , H ₂ S and NH ₄ .

Third, in the existing contact oxidation method of the aeration method, the bubbles of the air supplied from the bottom of the aeration tank rises and is not finely crushed so that the utilization rate of oxygen is low.

Fourth, it is difficult to control the increase or decrease of the amount of contact material during operation when the load of the organic material at the time of design is different from the load at the time of actual operation.

Fifth, when microorganisms grow excessively in the medium, it is difficult to normalize the medium by lifting the medium frame to shake the microorganisms artificially or using the impact of compressed air when the microorganisms are different.

Sixth, there is a case where the empty yogurt bottle is used as shown in FIG. 2 (34). However, most of the materials are produced through manufacturing process and the installation cost is high. Especially, in case of HBC, The cost is high.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems, and it is an object of the present invention to provide a new contact material and contact method which can maintain the most economical and stable high efficiency, .

Brief Description of the Drawings Fig. 1 is a structural view of a sand microorganism contact abandoning method according to the present invention,

Fig. 2 is a schematic view of a conventional microorganism-adhering material,

Fig. 3 is a plan view of Fig. 1,

4 is a CYCLONE type SAND separating tank, 4-2 is a conical SAND separating tank, 4-3 is a conical WEIR type SAND separating tank, 4-4 is a quadrangular pyramid type separating tank, Type SAND separation tank, 4-5 is a square HORN type SAND separation tank,

Fig. 5 is an installation model of an acid device,

FIG. 5A is an installation model of an acid device in the case of aeration by an air diffuser and an acid device,

FIG. 5B is an installation model of an acid device in the case of aeration by a water-

FIG. 6 is a model drawing of the AIR LIFT PUMP and the SAND drawing tank,

7 is a model view of a SAND amount control tank.

DESCRIPTION OF THE REFERENCE NUMERALS

1: Collection tank or primary settling tank 2: Raw water transfer pump

3. Raw water transfer pipe 4: Raw water transfer rate control valve

5: BY-PASS control valve 6: V-NOTCH

7: First aerator 8: Waste water transfer HOLE

9: Second aerator 10: Waste water transfer HOLE

11: Third aeration tank 12: SAND separation tank

13: connector 14: settling tank

15: treated water conveying pipe 16: AIR HEADER

17: Mountain Organs 18: Mountain Devices

19: Floating SAND Particles 20: AIR LIFT PUMP

21: SAND drawing tank 22: regulating valve

23: BIO-SAND return pipe 24: regulating valve

25: SAND amount control tank 26: AIR amount control valve

27: Separate wastewater transfer pipe 28: SAND drain valve

29: ciliated microorganism contact material 30, 31, 32: plastic microorganism contact material

33: regenerated plastic microorganism contact material 34: lung yogurt disease microorganism contact material

The basic concept of installing or dispensing microbial contact material to aeration tank of a conventional biological waste water treatment facility is the same as that of the present invention in the sand microorganism contact aeration system of the present invention, Is different from using natural sand instead of artificially processed material. The sand is collected and returned to the settling tank before it is lost to the settling tank, and the amount of sand can be easily adjusted according to the variation of the organic load. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a sand microbial contact abandoning method according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

According to the sand microbial contact abandonment method of the present invention, the wastewater flowing into the collecting tank or the primary settling tank 1 through the pretreatment or the like is introduced into one side of the V-NOTCH 6 by the wastewater transfer pump 2, Is introduced into the first aeration tank (7) together with the transporting sand that flows into the other side of the tank (6). Usually, aeration tank is composed of two or three or more stages, and an aeration tube (17) and an acid device (18) are installed under each aeration tank (7, 9, 11). And the sand particles 19 float as a contact material.

In the sand microbial contact abandonment method of the present invention, the acid device 18 is installed upside down as shown in FIG. 5 such that the direction of the mountain is downward, and the sand under the aeration basin 7, 9, It can be floated. In addition, sand can be continuously suspended in the wastewater even in the abandonment method using an aquatic aeration machine instead of an aeration machine, so that the present method can be applied. The suspended sand particles 19 flow into the final aeration tank 11 through the waste water transfer HOLEs 8 and 10 in the respective aeration tanks and the sand separation tank 12 is installed in the aeration surface of the third aeration tank 11 And the wastewater and floating sand particles 19 flow into the sand separation tank 12 at the planned water level. The sand particles flowing into the sand separation tank 12 are precipitated from the inside of the sand separation tank 12 and collected at the lower part because the upward flow of water and the levitation force of the air are insufficient.

An air lift pump 20 is installed in the inner bottom of the sand separation tank 12 to suck up a proper amount of compressed air to the SAND drawing tank 21. The sand is lifted by the control valve 22 and the BIO- The control valve 24 is controlled to return to the first aeration tank 7 through the V-NOTCH 6 via the first control valve 23 and the first aeration tank 7 when the surplus sand is temporarily stored according to the organic load. And the SAND drain valve 28 is opened to be introduced into the third aeration tank 11 to be introduced and recycled.

The type of sand used in this sand microorganism contact aeration method is quartz sand with a high degree of wear rate of 3% or less. The effective diameter of the particles is 0.2-0.4 MM, which has good floatability. It is good to use good 2.65 or more. The uniformity coefficient of particles is less than 2.0.

On the other hand, the wastewater separated from the sand particles 19 in the SAND separation tank 12 is transferred to the rectification column of the settling tank 14 through the connection pipe 13, separated from the sludge by sedimentation, . The waste water separated from the sand in the SAND amount control tank 25 flows into the aeration tank 11 or the settling tank 14 through the WEIR and the separated waste water transfer pipe 27 as shown in FIG.

In the sand microbial contact aeration method of the present invention, the amount of the sand as a contact material is maintained in the aeration tanks 7, 9, and 11, and the microbes attach to the floating SAND particles 19 to absorb and decompose the organic substances. This will overcome the disadvantages of contact materials.

In other words, the floating SAND particle (19) has a small specific gravity and a large amount of water, so that the total specific surface area is large. However, since a large amount of unnecessary microbes are not adhered to each other, the aerobic active microorganism having high decomposition ability is main and fast processing speed is maintained. So that the sedimentation separability is improved.

Also, since the bubble mass supplied to the acid device 18 rises and collides with the fine floating sand particles 19 continuously, the bubbles are miniaturized and the oxygen utilization rate is high and the microorganisms attached to each sand particle can be contacted with oxygen quickly and uniformly do. Therefore, the antagonistic action which is a trouble phenomenon between the odor and the aerobic / anaerobic microorganisms due to the appearance of the anaerobic microorganism will not occur.

The SAND separation tank 12, the drawing tank 21, and the SAND amount control tank 25 (see FIG. 1) can be easily adjusted and adjusted even when the load of the organic matter changes, ) And the purchase of natural sand is not expensive and the construction cost is low.

According to the BIO-SAND CONTACT AERATION SYSTEM of the present invention, various disadvantages of an artificial microorganism contact material can be compensated, and more importantly, the treatment of waste water and wastewater can be more stably maintained than the conventional method , The cause of artificial pollution in the process of producing artificial materials can be reduced, and the budget for water treatment facilities can be saved, thereby contributing to the improvement of the overall environment.

Claims (6)

In the sand microbial contact abandonment method, the existing biological aeration tanks 7, 9, and 11 and the aeration apparatus installed in the aeration tanks 7, 9, and 11 are connected to the aeration tube 17 and the acid device 18, A SAND separating tank 12 for separating and collecting the suspended sand particles 19, an AIR LIFR PUMP 20, a SAND draw- A BIO-SAND transfer pipe 23 for transferring the extracted sand to the first aeration tank 7, a tank 25 for regulating the amount of SAND and a valve 22 , 24, 26). ≪ / RTI > The method according to claim 1, An acid device 18 for supplying air to the aeration tanks 7, 9 and 11 is installed so that the direction of spraying is directed toward the bottom of the tank so that the sand particles can be suspended in the tank continuously without being sedimented on the bottom of the tank Wherein the microbial contact abatement method comprises: 3. The method according to claim 1 or 2, The sand introduced into the aeration tank (7, 9, 11) is a quartz material having good floatability, sedimentation, microbial adhesion and strength and has a wear rate of 3% or less, an effective diameter of 0.2 to 0.4 MM, a specific gravity of 2.55 to 2.65 or more, And a homogeneous coefficient of less than 2.0 is used. 3. The method according to claim 1 or 2, As a kind of aeration device installed in the aeration tank 7, 9 or 11, not the system by the air diffuser 17 and the acid device 18 as in FIG. 5A, but also the system by the water- The method comprising the steps of: The method according to claim 1, The SAND separation tank can be installed in various models as shown in FIG. 4 according to the shape of the aeration tank 7, 9, 11, and can be installed in a SAND separation tank having a structure capable of improving the efficiency of sand separation as shown in FIG. Wherein the microbial contact abatement method comprises: The method according to claim 1, The SAND amount control tank 25 is installed as a model of the settling tank as shown in FIG. 7, and the waste water separated from the sand is separately separated through WEIR and discharged to the final aeration tank 11 or the final settling tank 14 Wherein the microbial contact abatement method comprises: