WO2006022491A1

WO2006022491A1 - Filtration system for waste water disposal having a revolving filter bed

Info

Publication number: WO2006022491A1
Application number: PCT/KR2005/002717
Authority: WO
Inventors: In Hak Yun
Original assignee: Lee, Dae Hyung; Ecc Engineering Co., Ltd.
Priority date: 2004-08-23
Filing date: 2005-08-18
Publication date: 2006-03-02
Also published as: KR20060018168A; KR100667012B1

Abstract

The filtration system for waste water disposal having a revolving filter bed is comprised a waste water inlet pipe (10) for transferring waste water; a revolving filter (20) having a filter bed which continuously moves on, receiving an organic filter medium (F), filtering waste water, and free-falling the organic filter medium which absorbs the waste water at a downstream of the loop; a filter medium supplier (30) supplying the organic filter medium at certain amount before inflow of waste water onto the filter bed (21); a treated water collecting tank (40) collecting the treated water which flows through the filter bed; and a filter medium/waste water mingling tank (50) for receiving the organic filter medium which is free-fallen from the filter bed. All of waste water produced at an apartment house complex and wood wastes which absorb waste water make compost, and the compost can be recycled as resources.

Description

FILTRATION SYSTEM FOR WASTE WATER DISPOSAL HAVING A REVOLVING FILTER BED

Technical Field

[1] The present invention relates to a filtration system for waste water disposal having a revolving filter bed for utilizing gravity which is needed in a filtration process when waste water produced at an apartment complex, is treated at a pollution spot without discharging to the outside, and more particularly to the filtration system for waste water disposal having a revolving filter bed, in which an organic material composed with splinters made from wood wastes is used as a filter medium, a filter bed moves revolvably, which differs from a prior art, by which a waste water treatment process is simplified and a filtration facility becomes a small size, thus the waste water treatment time required is dramatically reduced, and the cost is also remarkably reduced, and further environmental pollution caused by waste water is prevented, all of waste water produced at an apartment house complex and wood wastes which absorb waste water make a compost, and the compost can be recycled as resources.

[2]

Background Art

[3] In recent years, urbanization is under way rapidly, and the usage of water in each household increases. Treatment of this developed waste water becomes serious envi¬ ronmental problems. Especially, when household might have the majority of waste water, in which treatment is the most difficult matter.

[4] The waste water is explained as polluted water that has no accumulated matter (i.e. heavy metal or toxic matter) in a human body. This must be different from effluent.

[5] There are two methods - an "end of pipe" treatment and a treatment "in place" - which are an artificial purification methods among a sewage/waste water treatment method.

[6] In a typical method of conventional sewage/waste water treatment, end of pipe treatment is one of the most popular present today. In this method, a pipe network such as separating pipe is established from a pollution spot to an end of pipe treatment plant. The end of pipe treatment plant is large-scale facility including a deposition tank, an aeration tank, a filtering tank, and a treated water storage tank. Waste water developed at a pollution source is collected via a pipe network to be treated.

[7] The end of pipe treatment plant must require an extensive facility site, establish many complex sub-facilities for processing each treating step.

[8] The extensive facility site and the complex sub-facilities bring up high construction cost. Also, a pipe network having lengthy pipes established from a pollution spot to an end of pipe treatment plant needs enormous construction expense. Operating the sewage/waste water treatment plant calls for the maintenance of the facility, which also adds high expenses.

[9] The water unnecessary to be treated (i.e. inflow of rainwater) is treated, and energy is wasted by running the facility. This is a drawback especially in rainy seasons, due to the large capacity required to hold the excess water. Inflow rainwater should be directly discharged to a river, which is exposed to serious problems.

[10] Since the end of pipe treatment plant is large-scale facility, much treated water is needed in the process of sewage/waste water treatment, which is difficult to recycle treated water. Most of the treated water would be discharged to a river. A treatment of sludge developed in a sewage/waste water treat process is very difficult, which brings up other problems.

[11] Most of sludge lumps in a shape of cake, and has been dumped in the oceans (65%), buried underground (25%), burned (5%), and recycled (5%). However, all methods except recycling method call forth secondary pollution, which has became envi¬ ronmental problems for a long time. As its counterplan, the sludge is composted, trying to recycle it. However, industrial effluent might include harmful materials that are mixed in the sewage flown into the end of pipe treatment plant. It may have a difficult problem to turn the sewage into compost.

[12] Being different from end of pipe treatment, the treatment in place (is called as clean technology or in situ treatment) changes waste water into developed water at a pollution site such as an apartment complex. All of the treated water is recycled as heavy water, landscape water, agricultural water, sprinkling, and a supplement to the underground water. The usage efficiency of water resources will increase, and water resource can be saved. Economy effect of energy expending on water resource production is very high.

[13] The treatment in place requires small scale facility, which brings up low installation cost, and no accompany facility such as pipe network is needed, thus is very economic.

[14] A conventional treatment in place is classified as physical, biologic, and chemical treatment method. In the present, all of three treatment methods can be properly combined to use water treatment.

[15] Further, water treatment is divided into normal water treatment and developed water treatment.

[16] Normal water treatment includes a physical treatment, which is the first treatment process (precipitation) and a chemical treatment, which is the second process. The treated water is discharged after going through two processes. The quality of water is less than 20 ppm. [17] Developed water treatment is based on re-treatment of the treated water that goes through the first and the second process. This is same filtering method as a purifier - drinking water treating facility. The quality of final treated water required is less than 5 ppm.

[18] In the developed treatment, there are rapid sand filtering method, activated charcoal method, and ultra filtration method. The rapid sand filtering method can be used at both a final water treatment process at a discharging stage of the end of pipe treatment, and a tap water treatment. At the end of pipe treatment, filter mediums like sand, gravel, activated charcoal, and anthracite are stacked in a stationary structure in pre¬ determined amount, and the treated water going through the first and second filtering process is filtered on a fixed filter bed.

[19] In the fixed filter bed treatment, after waste water filtration for a certain period, pollution material separated from waste water has been stacking on the filter medium, by which mud ball condition is formed.

[20] The reason of the mud ball occurs in all physical filters, is that most of filtration processes are accomplished a few D on a surface depth of a filter medium, and pollution material is stacked on the surface due to the continuous water inflow.

[21] As mud ball occurs on the surface, the filtering effect dramatically decreases. In order to enhance the filtering effect by eliminating pollution material (mud ball) from the surface, a supply of waste water stops, and waste water stacked on the surface is cleaned using high-pressure water, which should be done regularly.

[22] During the filtering process, waste water, which gets in between the filter medium or absorbed on the filter medium must be eliminated to get an extensive filtering and extend the usage period of the filter medium. High-pressure water is jetted onto the filter medium in the opposite direction to the waste water flow. The separated pollution material (sludge) from the filter medium is transferred along the predetermined path so as to be discharged to a special treatment chamber.

[23] The fixed filter bed filtering method should have a periodical cleaning process, which becomes very inconvenient. Much energy is needed in the cleaning process. The treatment efficiency has to decrease after some period.

[24] As the filter medium used in the above process has expired, the filter medium should be buried underground, or burned, which bring waste expense. More, it has the inconvenience of exchanging the expired filter medium with new filter medium.

[25] The conventional sewage/waste water treatment method can be restated as follows:

As shown FlG. 1, the first treatment, (screening, sediment and precipitation) a physical process is preceded in a basic treatment. After that, a second chemical treatment process is followed. When the treated water has a predetermined level of a quality, the treated water can be discharged. If a higher level of a quality of water is required, an additional developed treatment process (a rapid sand filtering method and an activated charcoal method) can be employed.

[26] However, in the conventional waste water treatment method, a lot of time can be wasted to both the first (physical) treatment and a second (chemical) treatment. To store the treated water for using the first and second treatment, an extensive site is required to accommodate a discharge control chamber, a sediment chamber and an aeration chamber. At each treatment step, the treated water should pass through a process comprised of complicated facilities, which can waste much energy to operate the treatment.

[27] Furthermore, in the conventional method, the complicated process it must go through, and high expense and energy can be brought upon. The treatment for wastes developed during sewage treatment is not meant to make satisfactory result, which is driving into corner. The new technology must be settled without any delay, which brings up no development of waste matter, recycle the waste matter to release from the burden to the conventional treatment facilities, and reproduce most waste matter to make the resources. Only waste water, which occupies most sewage and has no harmful element to human body, could be treated so as to use a recycle resource. Such a technology development is required.

[28] Especially, the treatment of wood among waste matter is very difficult to process.

There is a burned or a buried underground method in its treatment method. But, large volume brings up high transportation cost. The emission of carbon dioxide from the burned process is prohibited under the law, and also the buried underground method is prohibited due to the discharge of much leachate.

[29] Therefore, it claims the clean wood treatment, which does not give harmful effect to environment. The best method of the wood treatment is compost. The waste matter can be transferred to compost as new resources, which have economical value, can utilize, and give an aid to environment conservation.

[30] On the other hand, it has a problem that compost of wood waste requires a relatively large site and equipment such as a crusher. Also, the process of compost from the wood waste takes long time to the treatment.

[31]

Disclosure of Invention Technical Problem

[32] Accordingly, the inventor has suggested that the wood waste can be recycled as resource using the inventive water treatment. An object of the present invention is to provide a filtration system for waste water disposal having a revolving filter bed in which the filter bed moves revolvably when waste water produced at an apartment house complex is treated at a pollution spot without discharging to the outside, by which a waste water treatment process is simplified and a filtration facility becomes a small size, thus the waste water treatment time required is dramatically reduced, and the cost is also remarkably reduced.

[33] Other object of the present invention is to provide a filtration system for waste water disposal having a revolving filter bed in which an organic material composed with splinter made from wood wastes is used as a filter medium, and all of waste water produced at an apartment house complex and wood wastes which absorb waste water make compost, and the compost can be recycled as resources, thus the environmental pollution caused by waste water is prevented.

[34]

Technical Solution

[35] In order to accomplish the above object, a filtration system for waste water disposal having a revolving filter bed is comprised of a waste water inlet pipe for transferring waste water; a revolving filter provided below the waste water inlet pipe, having a filter bed which continuously moves on in a predetermined direction by a driving means along a track, receiving an organic filter medium made from a splinter on the filter bed, filtering waste water which come in through the waste water inlet in contact with the organic filter medium, and free-falling the organic filter medium which absorbs the waste water at a downstream of the track; a filter medium supplier provided above the filter bed, supplying the organic filter medium at certain amount before inflow of waste water onto the filter bed; a treated water collecting tank provided below the filter bed, and collecting the treated water which flows through the filter bed; and a filter medium/sewage mingling tank provided below the filter bed at the opposite point to the filter medium supplier, and receiving the organic filter medium which is free-fallen from the filter bed.

[36] In accordance with a preferred feature of this invention, the mesh is less than 2 D in size.

[37] In accordance with a preferred feature of this invention, the splinter has various crushed size within 1 ~ 5 D in thickness, and 5 ~ 25 D in length, and the various size splinters are mixed in a predetermined granule ratio, or the organic filter medium (F) is mixture in which a small amount of saw dust, or fallen leaves, or chaff are added to a large amount of splinters.

[38] The present invention having above characteristics is a rapid granul-medium filtration catalogued in a physical treatment, by which a developed water treatment is its target, and a first and a second treatment in a conventional process are simplified as single treatment step. [39]

Advantageous Effects

[40] Therefore, the present invention has an advantage, time and cost required in a treatment can be decreased compared to a conventional method.

[41] Furthermore, the present invention provides a filtration system for waste water disposal having a revolving filter, which differs from a conventional fixed filter bed method. A first (physical) treatment and a second (chemical) treatment are substituted by a simple single treatment, which energy saving effect is very high, and an in¬ stallation site can be reduced and the operating time can also be shortened dra¬ matically.

[42] Especially, in the present invention, the waste water is treated in place, all treated water can be recycled as a heavy water. Furthermore, both organic filter medium made from splinters and pollution material absorbed in the filter medium can make as compost through the digesting process. Methane is extracted during the digesting process, which has a big effect in the recycling of waste resource.

[43] Furthermore, the present invention has an advantage; the organic filter medium composed with splinter made from wood wastes has the wider surface area than sand and gravel which are mostly used in a convention method, which brings high ab¬ sorptivity and adhesion and has effect in the removal of pollution matter and the decrease of expense.

[44] Also, the track according to the present invention is a "caterpillar" like endless loop.

[45]

Brief Description of the Drawings

[46] The above and other objects, features and other advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:

[47] FIG. 1 is a flowchart illustrating a method of sewage/waste water according to a prior art;

[48] FIG. 2 is a cross-sectional view showing a filtration system for waste water disposal having a revolving filter bed according to the present invention;

[49] FIG. 3 is an extracted cross-sectional view showing a configuration of a filter bed utilized in the filtration system for waste water disposal having a revolving filter bed; and

[50] FIG. 4 is a flowchart illustrating a waste water treatment process using the filtration system for waste water disposal having a revolving filter bed according to the present invention.

[51] Mode for the Invention

[52] This invention will be described in further detail by way of exemplary embodiments with reference to the accompanying drawings.

[53] The water to be treated is categorized as three kinds of water: waste water, sewage, and effluent. Waste water is illustrated as pollution water, which is discharged from each household and has less harmful matter to the human body. Sewage is explained as mixed water in which rain or underground water is mixed in the waste water. Effluent is explained as harmful water to the human body, which has pollution material such as heavy metallic matter, and requires special treatment. However, sludge generated after treating the effluent is a specific refuse, thus is difficult to recycle.

[54] The present invention is clean environmental technology, which provides a filtration system for waste water disposal having a revolving filter bed that is utilized at the beginning step of waste water treatment called "treatment in place" or "in situ treatment".

[55] The present invention belongs to a physical treatment, and particularly belongs to a granul-medium filtration among a rapid filtration.

[56] Referring to FIGS. 2 to 4, a filtration system for waste water disposal having a revolving filter bed is comprised with a waste water inlet pipe (10) for transferring waste water generated at condominium complex into a treatment chamber; a revolving filter (20) having a filter bed (21) which continuously moves in a predetermined direction along a track (e.g. a caterpillar like endless loop); a filter medium supplier (30) for supplying the organic filter medium (F) onto the filter bed (21); a treated water collecting tank (40) for collecting the treated water by the revolving filter (20); and a filter medium/ waste water mingling tank (50) for storing the organic filter medium (F) that absorbs the waste water.

[57] The waste water inlet pipe (10) is connected to a discharge control tank, which collects waste water generated at each housing in condominium complex. The waste water inlet pipe (10) is provided so that the collected waste water is evenly dispersed onto the organic filter medium (F) stacked on the revolving filter (20).

[58] The revolving filter (20) is a major component in the present invention, which is provided below the waste water inlet pipe (10). The revolving filter (20) has a filter bed (21), which also continuously moves in a predetermined direction by a driving means along a track (a "caterpillar" like endless loop).

[59] The body of the revolving filter (20) is made by steel construction, such as H beam.

[60] The filter bed (21) is comprised of a mesh that is made of metallic or plastic material having flexible properties, and the mesh is less than 2 D in size.

[61] The driving means is comprised of a driving roller (22a), which is rotated by the rotation of force of a motor and gives a revolving movement to the filter bed (21), and plural driven rollers (22b) arranged at predetermined location so as to contact with the filter bed (21) and playing an idle along the revolving filter bed (21), enabling a shape of a revolving track of the filter bed (21) to be maintained.

[62] The filter bed (21) receives an organic filter medium (F) composed mostly from splinters on an upstream path of the filter bed (21), and filters waste water, which flows through the waste water inlet pipe (10). On a downstream path of the filter bed (21) is free-fallen the organic filter medium (F) which absorbs the waste water.

[63] It is more desirable that the filter bed (21) moves at a speed of 100 ~ 300 m/day. If the movement speed of the filter bed is less than 100 m/day, too much filter medium is unnecessarily consumed in respect to the amount of the treated water due to the low speed, which causes economical efficiency to decline. Whilst, if the movement speed of the filter is over 300 m/day, it brings insufficient filtering of waste water due to the filtering period being too fast. Considering the above condition, it is more desirable that the movement speed of the filter bed (21) is set to 180 m/day, an actual filter speed is established by experimenting the value on the spot.

[64] The revolving filter (20) is comprised of a first water collecting pan (23) provided below the upstream of the filter bed (21), which receives the treated water flown from the filter bed (21) and discharges the treated water into the treated water-collecting tank (40). Moreover, a high pressure sprinkler (24) is provided above the downstream of the filter bed (21), which sprays downward the high pressure cleaning water for eliminating the organic filter medium (F) and a waste water that are embedded on the filter bed (21).

[65] Furthermore, a residue collecting pan (25) is provided below the downstream of the filter bed (21), which receives the organic filter medium (F), the sewage and the cleaning water, and discharges those into the filter medium/ waste water mingling tank (50).

[66] The filter medium supplier (30) is provided above the upstream of the filter bed

(21), and accomplishes the function that the organic filter medium (F) made from most splinter is evenly spread on the filter bed (21) before the waste water flows down over the filter bed (21).

[67] The filter medium supplier (30) is comprised of a hopper (31) having an inlet (3 Ia) provided at the upper part of the hopper (31) for receiving the organic filter medium (F) and an outlet (31b) provided at the lower part of the hopper (31) for discharging the organic filter medium (F) on the upper end portion of the filter bed (21), and a dis¬ tribution means (32) provided near the outlet (31b) for evenly distributing the organic filter medium (F) stored in the hopper (31) onto the filter bed (21).

[68] The hopper (31) has preferably the volume that can contain the filter medium which is consumed in a day. For instance, if the volume of the treatment water per the filtering apparatus per day is 2,000 tonnes, the volume of the hopper (31) can be given as 20 tonnes.

[69] The distribution means (32) is for supplying the organic filter medium (F) evenly and stably. When the filter medium is sprayed on the filter bed (21) less than 50 D in thickness, the waste water cannot sufficiently be filtered, and the quality of the treated water is decreased. Whilst, when the filter medium is sprayed on the filter bed (21) more than 300 D in thickness, the economical efficiency is lessened owing to much consumption of filter medium in respect to the treatment water needed. It is more desirable that the organic filter medium (F) should be supplied on the filter bed (21) 50 ~ 300 D in thickness.

[70] In the present invention, the organic filter medium (F), which is mostly made from splinter, is adapted as the filter medium. The splinter can be configured as wood wastes that are crushed in the designed shape. The crushed wood waste is designed to make granule that can satisfy the treatment target of waste water i.e., the filter medium passing speed (100 ~ 300 m/day). The splinter has the configuration so that its length is more than 3 times its diameter.

[71] The splinter filter medium that is made by the above method might have an inferior absorbing force to an activated charcoal. However, filtering can only be achieved at a few D of surface layer of the filter medium in primary characteristic of the filter. Thus, it has advantage that the cost budget becomes less than the expensive activated charcoals, as well as maintaining almost same filter effect.

[72] It is desirable that the splinter has various crushed size within 1 ~ 5 D in thickness, and 5 ~ 25 D in length, and the various size splinters are mixed in a predetermined granule ratio. The granule ratio and the flow speed of the waste water in stacking the filter medium are established through an experiment. The filter medium is provided on the filter bed in the obtained design thickness.

[73] The inventive organic filter medium (F) can use a mixture in which a small amount of saw dust, or fallen leaves, or chaff are added to a large amount of splinters. Other kinds of filter medium, such as sand, activated charcoals, anthracite could be adapted as the inventive filter medium. However, those are improper to compost, and also are uneconomical in respect to energy utilization. It can bring an environment problem when processing the wastes. Preferably, it should be prevented from being used.

[74] The treated water-collecting tank (40) is provided below the filter bed (21), and temporally collects the treated water which flows through the filter bed (21).

[75] The collected water in the treated water collecting tank (40) is flown into the developed water treatment chamber (ultrafilter treatment) through a vacuum pump installed under the treated water collecting tank (40), it is further treated by a secondary developed water treatment procedure, and all water is used as heavy water.

[76] The filter medium/waste water mingling tank (50) is provided below the filter bed

(21) at the opposite point to the filter medium supplier (30), and stores temporarily the organic filter medium (F), which is free-fallen from the filter bed (21).

[77] The capacity of the medium/ waste water mingling tank (50) has preferably 3 times the filter medium supplier (30), but a usable capacity is more than 100 ton in volume considering with a marginal storage space.

[78] The filter medium/ waste water mingling tank (50) has an incline (51) which is formed at the portion onto where the organic filter medium (F) and the waste water are dropped, and the organic filter medium (F) and the waste water are uniformly mixed during a descent on the incline (51).

[79] In other word, at least one surface of the filter medium/ waste water mingling tank

(50) is configured as a slope (approx. 60°) under the downstream end of the filter bed (21), and is made from anti-corrosive and stable material (for instance, stainless steel or aluminum).

[80] The bottom portion of the filter medium/waste water mingling tank (50) is configured as 1/10 slope, so that all of the filter medium/waste water are easily wiped during rinsing or following down.

[81] The filter medium/ waste water mingling tank (50) does not need to install an additional machine, but a mixture agitator operated by a motor can be installed if necessary. Also, an inlet can be installed at the upper portion of the filter medium/ waste water mingling tank (50), so as to throw food garbage from household waste into the tank (50).

[82] An air duct can be installed at least two spots of the tank (50) so as to exhaust the gas generated inside.

[83] The contents of the filter medium/waste water mingling tank (50) can be carried out by a vacuum pump to move the contents into the digesting tank, at which aerobic compost process or anaerobic digesting process is then taken place.

[84] The operation of the filtration system for waste water disposal having a revolving filter bed is as follows:

[85] Firstly, the revolving filter (20) supplies the organic filter medium (F) on the upstream of the filter bed (21) through the filter medium supplier (30).

[86] At the same time, the waste water (more than BOD 200-300 ppm, design base) drops on the organic filter medium (F) through the waste water inlet pipe (10). The organic filter medium (F) eliminates the pollution material from the waste water that is free-dropped on the filter bed (21) by the processes such as straining, interception, sed¬ imentation, flocculation and adsorption. The waste water passes through the filter medium at a designated speed, and above 90% of the waste water is eliminated, thus the waste water has been treated as the treated material (BOD 10-20 ppm, design base).

[87] Unlike the conventional filtering method using a fixed filter bed, the upward portion of the filter bed (21) operated by a motor, moves continuously toward, and no mud ball phenomenon is taken place. Thus, there is not a need to provide a surface cleaning and a reverse cleaning on the filter bed (21).

[88] As the filter bed (21) revolves, the organic filter medium (F) having sludge that is abstracted from the waste water is transferred into the filter medium/waste water mingling tank (50).

[89] Consequently, the newly incoming waste water passes though the organic filter medium (F) that is newly supplied on the filter bed (21).

[90] The water that is treated by the above process passes through the filter bed (21) and is forwarded to the treated collecting tank (40). Next, the water is transferred to the developed water treatment chamber (second filtering facility, ultrafilter treatment).

[91] In developed water treatment, aeration takes place so that the water can be evenly passed through the filter. Finally, the water undergoes the ultrafilter treatment. Treated water can be recycled as heavy water.

[92] On the other hand, the filter medium (F) that makes the waste water clean and the pollution matter embedded in the filter medium move along the filter bed (21) at the predetermined speed of the motor. Both the filter medium and the pollution matter are free-dropped at the slope end of the downstream of the filter bed (21), and are separated from the filter of the filter bed (21) so as to be transferred into the filter medium/ waste water mingling tank (50).

[93] The filter of the filter bed (21) that takes off the pollution matter and the filter medium arrives at the lower portion of the revolving filter bed. The filter is cleaned by the high-pressure jetted sprinkler (24). The cleaned filter moves to the inlet (31a) of the hopper (31) to accomplish the next filtering steps. The waste water is filtered by the process repeated above.

[94] The waste water and the sludge that passes through the filter contain the residue- collecting pan (24), and are discharged into the filter medium/waste water mingling tank (50).

[95] The filter medium (F) and the pollution matter that free-dropped on the incline (51) are mixed as they flow down along the incline (51). More, the filter medium (F) and the pollution matter can be finely mixed in the case of an agitator that is installed in the mingling tank (50).

[96] The mixed matters are transferred to the next digesting process by a vacuum car, and undergo aerobic compost process or anaerobic digesting process so that the well fermented compost can be attained. [97] The waste water developed in each household does not need to discharge to the terminal treatment through a sewage pipe or a drainpipe. The waste water can be treated via an in-house treatment in the apartment/housing complex, and all the waste water and waste matter can be recycled as resources.

[98]

Industrial Applicability

[99] As described above, in a filtration system for waste water disposal having a revolving filter bed, when waste water produced at an apartment house complex is treated at a pollution area without discharging to the outside, the filter bed is configured as a revolving bed, by which a waste water treatment process is simplized and a filtration facility becomes a small size, thus the waste water treatment time required is dramatically reduced, and also the cost is remarkably lowered.

[100] The inventive filtration system for waste water disposal having a revolving filter bed in which an organic material composed with splinter made from wood wastes is used as a filter medium, and all of waste water produced at an apartment house complex and wood wastes which absorb waste water make compost, and the compost can be recycled as resources, thus the environment pollution caused by a waste water is prevented.

[101] The present invention having above characteristics is a rapid granul-medium filtration catalogued in a physical treatment, by which a developed water treatment is its target, and the first and second treatment in a conventional process are simplified as single treatment step.

[102] Therefore, the present invention has an advantage, time and cost required in treatment can be decreased with respect to a conventional method.

[103] Furthermore, the present invention provides a filtration system for waste water disposal having a revolving filter, which differs from a conventional fixed filter bed method. The first (physical) treatment and second (chemical) treatment are substituted as a simple single treatment, which energy saving effect is very high, and an in¬ stallation site can be reduced and the operating time can also be shortened dra¬ matically.

[104] Especially, in the present invention, the waste water is treated in place, all of the treated water can be recycled as a heavy water. Furthermore, both organic filter medium made from splinters and pollution material absorbed in the filter medium can make compost through the digesting process. Methane is extracted during the digesting process, which has big effect in the recycling of waste resource.

[105] Furthermore, the present invention has an advantage; the organic filter medium composed with splinter made from wood wastes has the wider surface area compared to sand and gravel which are mostly used in a convention method, which brings up high absorptivity, and adhesion and has effect in the removal of pollution matter and the decrease of expense. Although preferred embodiments of the present invention have been described for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as defined in the accompanying claims.

Claims

[1] L A filtration system for waste water disposal having a revolving filter bed comprising: a waste water inlet pipe (10) for transferring waste water; a revolving filter (20) provided below the waste water inlet pipe (10), having a filter bed (21) which continuously moves on in a predetermined direction by a driving means along a track, receiving an organic filter medium (F) made from a splinter on the filter bed (21), filtering the waste water which come in through the waste water inlet (10) in contact with the organic filter medium (F), and free- falling the organic filter medium (F) which absorbs the waste water at a downstream of the track; a filter medium supplier (30) provided above the filter bed (21), supplying the organic filter medium (F) at certain amount before inflow of waste water onto the filter bed (21); treated water collecting tank (40) provided below the filter bed (21), and collecting treated water which flows through the filter bed (21); and a filter medium/ waste water mingling tank (50) provided below the filter bed (21) at the opposite point to the filter medium supplier (30), and receiving the organic filter medium (F) which is free-fallen from the filter bed (21).

[2] 2. The filtration system for waste water disposal having a revolving filter bed according to claim 1, wherein: the driving means is comprised of a driving roller (22a) which is rotated by rotation force of a motor and gives a revolving movement to the filter bed (21), and plural driven rollers (22b) arranged at pre¬ determined location so as to contact with the filter bed (21) and playing an idle along the revolving filter bed (21), enabling a shape of a revolving track of the filter bed (21) to be maintained.

[3] 3. The filtration system for waste water disposal having a revolving filter bed according to claim 1 or 2, wherein: the filter bed (21) is comprised of a mesh made of metallic or plastic material having flexible properties.

[4] 4. The filtration system for waste water disposal having a revolving filter bed according to claim 3, wherein: the mesh is less than 2 D in size.

[5] 5. The filtration system for waste water disposal having a revolving filter bed according to any one of claims 1 to 4, wherein: the filter bed (21) moves at a speed of 100 ~ 300 m/day.

[6] 6. The filtration system for waste water disposal having a revolving filter bed according to claim 1, wherein: the revolving filter (20) is further comprised of a first water collecting pan (23) provided below the upstream of the filter bed (21), receiving the treated water flown from the filter bed (21) and discharging the treated water into the treated water collecting tank (40), a high pressure sprinkler (24) provided above the downstream of the filter bed (21), and spraying downward the high pressure cleaning water for eliminating the organic filter medium (F) and a waste water which are embedded on the filter bed (21), and a residue collecting pan (25) provided below the downstream of the filter bed (21), receiving the organic filter medium (F), the waste water and the cleaning water, and discharging those into the filter medium/ waste water mingling tank (50).

[7] 7. The filtration system for waste water disposal having a revolving filter bed according to claim 1, wherein: the splinter has various crushed size within 1 ~ 5 D in thickness, and 5 ~ 25 D in length, and the various size splinters are mixed in a predetermined granule ratio.

[8] 8. The filtration system for waste water disposal having a revolving filter bed according to claim 1, wherein: the organic filter medium (F) is mixture in which a small amount of saw dust, or fallen leaves, or chaff are added to a large amount of splinters.

[9] 9. The filtration system for waste water disposal having a revolving filter bed according to claim 1, wherein: the filter medium supplier (30) is comprised of a hopper (31) having an inlet (31a) provided at the upper part of the hopper (31) for receiving the organic filter medium (F) and an outlet (31b) provided at the lower part of the hopper (31) for discharging the organic filter medium (F) on the upper end portion of the filter bed (21), and a distribution means (32) provided near the outlet (31b) for evenly distributing the organic filter medium (F) stored in the hopper(31) onto the filter bed (21).

[10] 10. The filtration system for waste water disposal having a revolving filter bed according to any one of claims 1, 7, 8 and 9, wherein: the organic filter medium (F) is supplied on the filter bed (21) in the thickness of 50 ~ 300 D.

[11] 11. The filtration system for waste water disposal having a revolving filter bed according to claim 1, wherein: the filter medium/waste water mingling tank (50) has an incline (51) which is formed at the portion onto where the organic filter medium (F) and the waste water are dropped, and the organic filter medium (F) and the waste water are uniformly mixed during a descent on the incline (51).

[12] 12. The filtration system for waste water disposal having a revolving filter bed according to any one of claims 1, wherein: the track is a "caterpillar" like endless loop.