KR19980025254A - Wastewater purification treatment system and method using vertical rotary contact filtering method - Google Patents

Abstract

The present invention relates to a wastewater and wastewater treatment apparatus and method using a vertical rotary contact filtering method, the conventional treatment apparatus is capable of treating a certain concentration of organic material, but nitrogen (TN) and phosphorus (TP) component Even though the treatment technology development is currently being actively researched or developed, it is not practically used in the field due to the high economic cost such as high facility cost and high operating cost.

Therefore, the present invention is a wastewater treatment tank consisting of wastewater storage tank 10, filtration tank 20, aeration tank 50, sedimentation tank 70, discharge tank 80, the filtration tank 20 in the bottom-up And an anaerobic tank 30 and a denitrification tank 40 for decaying wastewater while maintaining an airtight state between the filtration tank 20 and the aeration tank 50, and the aeration tank 50 and the precipitation tank 70. Between the air supply nitriding tank 60 is installed between the anaerobic tank 30 and the denitrification tank 40, aeration tank 50, the nitriding tank 60, respectively, the vertical rotary contact image biofilm device 100 By inducing automatic dropout of the aging deposited microorganism group in the anaerobic tank (30), denitrification tank (40), aeration tank (50), nitriding tank (60), and improved the cultivation efficiency of microorganisms with good activity, this invention The structure is simple, so the cost of facility is low, the operation according to the processing process is simple, and the maintenance cost is low. Solvent resistance, and which will be broadly applicable to a large-scale sewage treatment plant from villages municipal sewage treatment plant.

Description

Wastewater Purification Treatment Apparatus and Method Using Vertical Rotary Contact Filtering

The present invention relates to a wastewater treatment apparatus and method using a vertical rotary contact filtering method, and more particularly, to the biofilm treatment method, that is, cultivation and slidability of various microorganism groups when biological treatment of wastewater. The present invention relates to a purification apparatus and method using a vertical rotary contact imaging method which is effective in increasing the cultivation efficiency of aerobic microorganisms and removing nitrogen and phosphorus contained in wastewater using the biopurification principle of the natural ecosystem food chain.

In general, various sewage, industrial wastewater, and livestock wastewater (hereinafter referred to as `` wastewater '') from various sewage and manure septic tanks are treated with water at all times due to environmental pollution, resulting in BOD (biological oxygen demand, hereinafter referred to as BOD). Is regulated to be discharged as low as possible, and for this purpose, it is mandatory to install wastewater treatment facilities in factories or large apartment complexes that discharge various wastewater and wastewater.

These various sewage, industrial wastewater, and industrial wastewater discharged from dyeing factories contain large amounts of organic substances and colors that contaminate rivers or coasts, and the fish are killed with red tide due to discharge without proper purification. The destruction of the ecosystem is often occurring, such as being hit.

Therefore, these various wastewaters should be purified and discharged, and the function and efficiency of the treatment system depend on how quickly and continuously many aerobic microorganisms that lower the BOD of the wastewater in the contact oxidation tank can be cultured. In this way, by increasing the cultivation efficiency of aerobic microorganisms, it is possible to more quickly and efficiently remove suspended matter, contaminants and chromaticity contained in the wastewater.

To this end, conventional wastewater and wastewater treatment apparatuses that have been developed and used in the prior art include Patent No. 94,222 (notification number 95-13317), which is patented and registered by the applicant of the present application. MEDIA) has been mainly used to cultivate and purify microorganisms by supplying air (oxygen) and to reduce site area by shortening residence time by standard activated sludge method.

However, the method of culturing and purifying microorganisms has many problems in post-management due to excessive accumulation of sludge (microbial), and the standard active sludge method is only 80% of final treatment efficiency, which makes it impossible to process highly. Denitrification and dephosphorization, the main culprit of red tide in lakes, rivers and seas, are insufficient.

However, in Korea, the characteristics of the wastewater and wastewater discharged are very complicated due to the regional characteristics of small dyeing and plating plants, leather processing plants, livestock farms that raise cows and pigs in small units. These wastes and wastewater contain a significant amount of nitrogen (TN) and phosphorus (TP), and a long study shows that the nitrogen (TN) and phosphorus (TP) contained in wastewater contain red tide and water pollution. It has been found to be the culprit causing the back.

However, the above conventional treatment apparatus is capable of treating organic substances at a certain concentration, but the nitrogen (TN) and phosphorus (TP) components, which are a problem in wastewater purification treatment, are not effectively removed. Even though the treatment technology development is currently being actively researched or developed, it is not practically used in the field due to the high economic cost such as high facility cost and high operating cost.

In addition, there is a horizontal rotary contact imager, which the applicant has filed in 1996 Patent Application No. 221373, which is filled in the contact container which is rotated horizontally, although it is possible to obtain a fairly good water quality during wastewater treatment. Since the amount of contact materials is small, the amount of installed water must be increased to remove a large amount of BOD, so there is a burden of large facility investment cost for large-scale sewage treatment.

Therefore, the actual countermeasures due to the purification of wastewater and wastewater containing a large amount of nitrogen (TN) and phosphorus (TP) have not been established, and even if there are countermeasures, they are extremely weak. In the current difficult economic conditions of the IMF, the government is unable to properly regulate the law.

In other words, realistically desirable countermeasures should be suitable facilities for large-capacity while satisfying conditions such as low construction cost and good treatment efficiency, convenient maintenance and low maintenance cost, so that various wastewater and wastewater can be This is because it can be easily installed and used in the discharge area.

The present invention has been invented to solve the above-mentioned conventional problems after long experience and research in the field, an object of the present invention is to cultivate aerobic microorganisms to lower the BOD of various wastewater, wastewater, wastewater The present invention provides a purification treatment apparatus and method using a vertical rotary contact filtering method that can efficiently remove nitrogen (TN), phosphorus (TP), and the like contained therein, and incurs low installation and maintenance costs.

1 is a schematic diagram illustrating an apparatus of the present invention for each processing step

2 is a block diagram illustrating the processing process of FIG.

3 is a principle diagram of the vertical rotary contact image biofilm device of the present invention

4 is a front view illustrating a state in which the vertical rotary contact image biofilm device of the present invention is installed in the treatment tank by partially cross-sectional view.

5 is a cross-sectional plan view of the vertical rotary contact image biofilm device of the present invention

Explanation of symbols for main parts of the drawings

20: filtration tank 30: anaerobic tank

40: denitrification tank 50: aeration tank

60: nitriding tank 70: precipitation tank

100: vertical rotary contact image biofilm device

110: contact cylinder 111: drive unit

112: guide blade piece 113: a receiving portion of the contact member

115: stirring blade

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Hereinafter, specific technical configurations and operations capable of effectively achieving the object of the present invention will be described in detail with reference to the preferred embodiments and accompanying drawings.

FIG. 1 illustrates a process chart of the present invention, and FIG. 2 is a block diagram of the process chart of FIG. 1, and includes a storage tank 10 into which wastewater and wastewater flow in the treatment apparatus of the present invention, and various floats and contaminants. The configuration of the filtering filtration tank 20, the aeration tank 50 for supplying air to the aerator 51, the aeration tank 50 for culturing aerobic microorganisms, the settling tank 70 for precipitating sludge, and the discharge tank 80 for disinfecting and discharging the purified water. Can be said to be the same as a conventional processing apparatus.

A feature of the present invention is the anaerobic tank 30 and the denitrification tank 40 which forms the filtration tank 20 upwardly and decays the waste water while maintaining an airtight state between the filtration tank 20 and the aeration tank 50. Install the nitriding tank 60 through which air is supplied between the aeration tank 50 and the settling tank 70 to allow the waste water to pass in turn, but the anaerobic tank 30 and the denitrification tank 40 and the aeration tank 50. And the vertical rotational contact image biofilm device 100 are installed in the nitriding tank and the nitriding tank 60, respectively.

The vertical rotary contact image biofilm apparatus 100 installed in the treatment tank is composed of a contact cylinder 110 and a driving unit 111 provided with a reducer to rotate the same as shown in FIGS. 4 and 5. Re-cylinder 110 is a plurality of guide blades 112 are erected vertically at a predetermined interval in a state inclined at a predetermined angle on the outer peripheral surface, the receiving portion of the contact member 116 on the inner surface of the guide blades 112 113 is partitioned.

In addition, a plurality of stirring blades 115 are radially installed at the center portion of the contact shaft 110 in which the rotating shaft 114 is fitted, so that various floating matters in the wastewater are quickly discharged downward, wherein the contact member 116 is disposed. The contact cylinder 110 is accommodated may be manufactured in a variety of forms, such as circular, polygonal, the rotation method may use a variety of driving means of hydraulic, pneumatic in addition to the reducer.

In addition, the rotary shaft 114 of the contact cylinder 110 may be formed as a hollow shaft so that air can be injected without installing an aerator in the aeration tank and the nitriding tank.

In addition, a first circulation pipe 61 for supplying circulating water from the nitriding tank 60 to the denitrification tank 40 is installed, and the aerator 51 is driven at the upper end of the aeration tank 50 and the nitriding tank 60. A defoaming pipe (62) is installed to remove bubbles generated at the time, and a sludge storage tank (90) is installed at a lower portion of the settling tank (70), and the supernatant for supplying supernatant water from the sludge storage tank (90) to the denitrification tank (40). The second circulation pipe 91 is provided.

Referring to the process of treating the waste water by the apparatus of the present invention, first, the various kinds of suspended solids and contaminants contained in the waste water of the storage tank 10 are filtered in the bottom-up filter tank 20, and the filtered waste water is Air is supplied to the anaerobic tank 30, the denitrification tank 40, and the aerator 51, which maintains an oxygen-free sealed state, to sequentially pass through the aeration tank 50 and the nitriding tank 60 in which aerobic microorganisms are cultured.

At this time, the rotational speed of the contact cylinder 110 of the vertical rotary contact image biofilm device 100 installed in the anaerobic tank 30, the denitrification tank 40, the aeration tank 50, the nitriding tank 60 to the drive unit 111 By rotating the initial outer circumferential speed up to 12 to 15 m / min, usually 3 to 5 m / min to induce automatic dropout of the aging deposited microbial group.

That is, since the plurality of guide blades 112 are vertically installed at predetermined angles on the outer circumferential surface of the contact cylinder 110 at a predetermined interval, when the contact cylinder 110 is rotated as described above, each of the guide blade pieces 112 is rotated. As the intake of wastewater and wastewater flows very well, aging-accumulated microbial groups are automatically eliminated, and only active microorganisms stick to the contact material to form a generational replacement.

Therefore, in the present invention, the wastewater can be very good in the anaerobic bacteria in the anaerobic tank 30 and the denitrification tank 40, especially when the contact cylinder 110 is rotated as described above of the contact cylinder 110 Since the stirring action of the waste water is made by the stirring blades 115 pieces installed in the center, the denitrification and dephosphorization process in the denitrification tank 40 is made very naturally.

And, in the aeration tank 50, only the microorganisms that are vigorously active in the contact cylinder 110 of the vertical rotary contact image biofilm device 100 rotated as described above are incubated and stirred by the stirring wing 115 pieces. By preventing the deposition of microbial group by the action, it is possible to facilitate the proper automatic desorption and the average supply of dissolved oxygen or microbial food, so that high-quality microorganisms are cultivated at a faster time, thereby increasing the purification efficiency.

In addition, in the nitriding tank 60, as the microbial group adheres to the contact material by the vertical rotary contact image biofilm apparatus 100 during the nitriding process, there is almost no MLSS concentration around it, and the BOD concentration is 10. It is maintained at less than mg / l , circulating the waste water from the nitriding tank (60) to the denitrification tank (40) through the first circulation pipe (61) to make a smooth progress while denitrification and nitriding coexist with each other. do. According to the present invention, as a result of purifying and testing wastewater and wastewater in various places in Korea, the following treatment efficiency was obtained.

Example 1 (Test article: Sewage from the Seoul Education Office, Retirement Training Institute)

Metric Before treatment After treatment Processing efficiency (%) BOD (mg / l ) 148.5 5.2 96.4 SS (mg / l ) 152.5 9.4 93.8 TN (mg / l ) 75.5 12.7 62.8 TP (mg / l ) 9.2 3.2 65.2

Example 2 (Test article: Sewage at a hotel in Gangneung)

Metric Before treatment After treatment Processing efficiency (%) BOD (mg / l ) 189 5.8 96.9 TN (mg / l ) 80.5 14.2 82.3 TP (mg / l ) 9.7 4 58.7

Example 3 (Test article: Sewage at sewage treatment plant in Gyeonggi-do)

Metric Before treatment After treatment Processing efficiency (%) BOD (mg / l ) 145 3.2 97.7 SS (mg / l ) 152 4.2 97.2 TN (mg / l ) 35 9 74.2 TP (mg / l ) 8 3.8 52.5

As a result of the experiment, the BOD of the effluent showed a removal rate of 96% or more as about 3 to 5 ppm, and the SS showed almost 4 to 9 ppm in the effluent. When the most basic BOD, SS (colloid) is treated well below the baseline 10 mg / l (actual 5 mg / l ), the result is that there is no excess sludge so that the surplus sludge can not be extracted even for about 1 month It can be said to be a big feature, and it can be seen that various maintenance costs due to post sludge treatment are not very high.

The principle of the vertical rotary contact image biofilm device 100 of the present invention is as shown in Figure 3, the microbial reaction at this time is as follows.

(1) removal of BOD

BOD removal in aerobic treatment shows the process by which microorganisms decompose organic matters such as carbohydrates, fats, and proteins in sewage or wastewater by using oxygen in air and water to carbon dioxide gas and water, It is as follows.

(a) Oxidation of Organics

C _x H _y O ₂ + (x + y / 4-z / 2) O ₂ → xCO ₂ + y / ₂ H ₂ O-ΔH ------- ①

(b) formation of cytoplasm

nC _x H _y O ₂ + nNH ₃ + n (x + y / 4-z / 2-5) O ₂ →

(C ₅ H ₇ NO ₂ ) n + n (x-4) CO ₂ + n / 2 (y-4) H ₂ O-ΔH ------- ②

(c) Oxidation of cytoplasm (self oxidation)

(C ₅ H ₇ NO ₂ ) n + 5nO ₂ → 5nCO ₂ + 2nH ₂ O + NH ₃ -ΔH ------- ③

Some of the organic matter in the sewage comes into contact with the microorganisms and is oxidized to inorganic matters such as carbon dioxide or water according to the above ① formula, and the other part is used for cell formation of the microorganism according to the above formula ②. In addition, when the amount of organic matter in the sewage is small, the microorganism gets energy by its cellular decomposition as shown in the above ③ method, and the amount of surplus sludge is extremely reduced, so that the amount of surplus sludge does not occur. It has the advantage of being extremely small.

(2) Biological Nitriding Denitrification Principle

Biological denitrification is a method of converting nitrogen compounds in water into inert nitrogen gas by the action of nitrifying bacteria and denitrifying bacteria. It is composed of nitriding process and denitrification process. In particular, the anaerobic tank 30 and the denitrification tank 40 (anoxic tank), which are sealed as inducing denitrification and are not supplied with air, are provided.

(a) Nitriding Process (Aerobic Oxidation)

Organic N ---- NH ₄ ⁺

Combining the above ① and ② expressions, it becomes the following ③ expression.

In other words, 2 mol of oxygen is required for oxidation of 1 mol of NH ₄ ⁺ -N.

Nitrogen bacteria such as Nitromonas and Nitrobacter are autotrophic bacteria that synthesize cells by reducing CO ₂ using energy obtained by oxidation of NH ₄ ⁺ or NO ₂ ^- without the need for organic material for growth. The cell synthesis reaction is shown in the following equations ④ and ⑤. When 1KG NO ₂ ⁻ is oxidized from the equation ④, 0.02 Nitrobacter is synthesized. The cell growth rate is very small compared to the growth rate of BOD oxidizing bacteria (0.5-0.7).

5CO ₂ + 55NH ₄ ⁺ + 76O ₂ ------- C ₅ H ₇ NO ₂ + 52H ₂ O + 109H ⁺ ------- ④

^{_{5CO + 400NO 2 - + 195O 2}} + NH 3 + 2H 2 O ------ C 5 H 7 NO 2 + 400NO 3 - ------- ⑤

The above process is performed in the aeration tank 50 and the nitriding tank 60, which are aerobic treatment processes in the denitrification and dephosphorization process of FIG.

(b) Denitrification process (anaerobic and oxygen free: denitrification tank reduction)

This process is carried out in the anaerobic tank, anaerobic tank of Figure 1, the process flow chart, the principle is as follows.

Is a facultative anaerobic bacteria breathe using oxygen in the ^{molecular-denitrification} bacteria such as Pseudomonas are heterotrophic bacteria inde aerobic conditions in which NO ₃ requires an organic substance on the proliferation. Hydrogen donors in the denitrification process are often used as metanolyl. In this rotary contact image biofilm method, the BOD is increased again, including the maintenance cost of chemicals due to conventional injection of methanol. Due to side effects such as pH change, it was too uneconomical to use, and solved the problem that cannot be used.

In the present invention, as shown in FIG. Even if it is not a circulation method, since the anaerobic tank 30 and the denitrification tank 40 (anoxic tank) are separately installed, denitrification and dephosphorization are performed smoothly by food chains by various microbial groups such as anaerobic bacteria, aerobic bacteria, and aerobic bacteria. This is due to the principle that all physiology in nature is driven by the food chain.

As described above, the present invention cultivates and adheres to a variety of microbial groups in the contact material filled using the contact method using the vertical rotary contact image biofilm device 100 when performing a biological treatment process, so as to purify the biochemical chain of the natural ecosystem. Principle is achieved, and also it can automatically prevent pollution of the second pollutant caused by over-attachment or sedimentation of microbial group, and induce proper automatic dropping of sludge, improve purification ability by active generation replacement of microbial group. You can.

As described above, a device in which a conventional contact material is fixedly stacked and accumulated to a certain amount of time is considered to be deposited rather than sludge. By inducing the balance of oxygen supply and strong adhesion of sludge and high concentration adhesion, the sedimentation is good, and in the aerobic aeration tank (50) and the nitriding tank (60) as well as the anaerobic tank and the denitrification tank (40), the proper stirring effect and anaerobic bacteria, A high treatment effect can be obtained by cultivating good denitrifying bacteria.

In addition, the device of the present invention has a simple structure, low facility cost, low operation and maintenance costs according to the treatment process, high efficiency of wastewater and wastewater treatment, economical efficiency, and minimization of facility area is required. In view of this, the treatment apparatus and treatment method of the present invention is a very useful invention that can be widely applied from a village sewage treatment plant to a large city sewage treatment plant.

Claims (4)

In the sewage and wastewater treatment apparatus consisting of the sewage and waste water storage tank 10, the filtration tank 20, the aeration tank 50, the sedimentation tank 70, and the discharge tank 80, the filtration tank 20 is formed upward and the An anaerobic tank 30 and a denitrification tank 40 are installed between the filtration tank 20 and the aeration tank 50 to decay wastewater while maintaining an airtight state of oxygen free, and between the aeration tank 50 and the settling tank 70 Install the nitriding tank 60 to be supplied to the anaerobic tank 30 and the denitrification tank 40, the aeration tank 50, the nitriding tank 60 by installing a vertical rotary contact filter biofilm device 100 respectively anaerobic tank ( 30), vertical rotary contact filter, characterized in that the induction of automatic dropping of the aging deposited microorganism group in the denitrification tank 40, the aeration tank 50, the nitriding tank (60) and the swelling culture efficiency of microorganisms with good activity Wastewater and wastewater treatment equipment using commercial method According to claim 1, The vertical rotary contact image biofilm device 100 is composed of a contact cylinder 110 and a drive unit 111 is provided with a reduction gear for rotating it, the contact cylinder 110 is a plurality of outer peripheral surface Guide blade pieces 112 are vertically placed at a predetermined interval in a state inclined at a predetermined angle, the inner surface of the guide blade pieces 112 is formed with a contact member accommodating portion 113, the contact tube 110 The wastewater purification apparatus using the vertical rotary contact filter method, characterized in that a plurality of stirring blades 115 are radially installed in the central portion of the rotary shaft 114 is inserted into). The method of claim 2, wherein the contact cylinder 110 is made in the form of a circle or polygon using a means of hydraulic pressure, pneumatic by the rotation method, by forming the rotary shaft 114 of the contact cylinder 110 to a hollow shaft Wastewater purification treatment apparatus using vertical rotary contact filtering method characterized in that the air can be supplied to the aeration tank (50) and the nitriding tank (60) without the aerator (51). In the wastewater storage tank 10, the filtration tank 20, the aeration tank 50, the sedimentation tank 70, the discharge tank 80 in order to pass the wastewater and waste water in order to purify, the filtration tank 20 and the aeration tank 50 The anaerobic tank 30 and the denitrification tank 40 are installed between the aeration tank 50 and the settling tank 70 while maintaining an airtight state in the absence of oxygen. Install a vertical rotary contact filter biofilm device 100 in the aeration tank and the denitrification tank 40, the aeration tank 50, and the settling tank 70, respectively, and then install the vertical rotary contact filter biofilm device 100. The initial outer circumferential rotation speed of the contact tube 110 is rotated at a maximum of 3 to 15 m / min, usually 3 to 5 m / min to induce automatic dropout of the aging deposited microbial group and to induce the adsorption of active microorganisms. A wastewater purification treatment method using a vertical rotary contact filtering method.