BACKGROUND OF THE INVENTION : 1) There are three kinds of filtration fabrics, which already exist in some of wastewater purification systems based on microbiology methods. These fabrics do not enable those systems to be as effective and efficient as the system, which uses the invented Wastewater Woven filtration fabric.

2) One fabric that already exists, is a fabric which is used as filtrating material in a process of wastewater biodegradation purification treatment [u. s. patent document # 4810385 current U. S. Class: 66/195; 66/193,1989] (hereinafter referred as:"The 1"type"). This material is designed as a porous piped material, inside of which dry bacterial cultures are being placed, and while being put in wastewater stream it fulfills the biodegradation process.

The disadvantage of the Ist type is that after passing the partition, the bacteria does not remain on the surface of the fabric, but is carried away by the stream of water, resulting in a large waste of bacterial culture. Furthermore, during the process of the filtration fabric exploitation the fabric's pours are being clogged from the outer side by particles contained in the wastewater, which blocks the pass of the bacteria and decreases the effectiveness of the purification.

In order to solve this problem there is a constant need for cleaning and maintaining the device-time after time. This process takes more time and results in a high cost of maintenance.

3) Another fabric which already exists, is a fabric-similar to the I"type-also used as a filtration material for treating wastewater [u. s. patent document # 5771716 current U. S.

Class : 66/195 ; 66/193,1998] (hereinafter referred as:"The 2"type"). This fabric contains a basis of interlaced warp and parallel threads, which form cells. These threads are connected by one end to a number of fiber elements that creates a sort of feathers.

The 2nd type also, can not be effectively used for a biological treatment of wastewater stream, because of its'structure and design. The reason for it is that one direction of the water stream provides maximum stream resistance by blocking the cells with fiber when on the other side there is a regeneration of stream minimum resistance. Hence, while using the 2nd type in wastewater stream in the direction of the regeneration, and planting bacterial cultures on the fiber, the effect of the treatment is yet little.

The effect mentioned above could be explained by the fact that during the working process the resistance of the material to the stream reduces while the speed of the stream increases. This effect shortens the contact time between the water and the bacteria on the fiber, and as a result there is a reduction of the treatment effectiveness.

Moreover, as the material's composition must be chosen on the condition of minimal surface adhesion with strange particles, the bacteria will be unwilling to stay on the fiber and will be carried away by the stream.

As a result there is a high level of bacteria waste. Hence there is a reduction of the effectiveness of the treatment as the time passes by, because of the decrease of the bacteria on the fiber.

4) A third kind of fabric which already exists, [A Russian Patent No. 2078162. (Invented by Mr. Igor Krasnov-the current inventor) Registered on April 27th 1997], have already given a few partial solutions to the problem of the clogged pours, the problem of the constant need for cleaning and maintaining the devices, and of the problem of the high level of waste of bacteria.

Yet, this type of fabric has also to be improved, since it still tends to have some difficulties in preserving the microorganisms in their habitat in and around the fabric, as well as difficulties in maintaining a large surface for the long encounter between the water and the bacteria.

Another problem which exist in this type of fabric, is the adhesion of the loosen threads, while the water stream is weakened, a thing that causes the microorganisms to be carried away by the stream DISCLOSURE OF THE INVENTION : The scat of the invention The invention goal is to increase the effectiveness of the wastewater purification system mentioned above, which is based on microbiology methods, and to make it more efficient by enabling the possibility of creating compact, high effective wastewater-treatment devices.

The use of the invented fabric, which is made as a unique kind of a"dynamic net"based on warp and woof woven threads, is needed in order to solve the problems in the current working process of the wastewater purification system.

Summery of the invention 1) As the current wastewater purification devices, especially those that use the first two types of fabric mentioned above, do not maximize the efficiency of the wastewater purification systems, there is a need for an advanced device which will solve the existing problems.

2) Accordingly, the aim of the invention is to increase the effectiveness of the wastewater purification process and to allow a possibility of creating compact, wastewater treatment devices in which there is no constant need for cleaning and maintaining the device. These devices, which are able to work in a condition of varying hydraulic pressure without any decrease in the treatment effectiveness, will guarantee a continuous process which maximize the efficiency of the wastewater purification systems.

BRIEF DESCRIPTION OF DRAWINGS: FIG. 1 illustrates a magnified part of the invented filtration fabric with marked elements, where a indicates the width of the volumetric woven stripe, b indicates the size of each cell in the parallel direction, c indicates the width of the warp static threads, and d indicates the width of the warp dynamic threads.

FIG. 2 illustrates a magnified part of the invented filtration fabric set in a wastewater stream with marked vector of the wastewater stream, during an increased hydraulic pressure.

FIG. 3 illustrates a magnified part of the invented filtration fabric set in a wastewater stream during a reduced hydraulic pressure, In which the microorganisms'level stays high compared to other conditions.

CARRYING OUT THE INVENTION A DETAILED DESCRIPTION : 1) The solution contained in the invention, is based on a unique kind of a filtration fabric which contains stripes of warp threads, interchanged by limiting cells in the parallel direction of the material. The stripes of warp and woof threads are in a width of a few cm, while the long warp threads are of various lengths and of various linear densities.

Those dimensions are varying from one device to another, in regard of the quality and the amount of the treated wastewater.

2) As illustrated in FIG. 1, the short threads (c) are the static elements of the filter and the long threads (d) are the dynamic elements of it. The warp threads (a) are volumetric processed threads, while the woof threads are twisted or made of single yarns of chemical filaments.

3) In order to have a good adhesion between the fabric and the bacterial culture, the cells are structured in a way that they are restricted by woven perpendicular stripes made of linen and combined interlacing [FIG. 1]. This structure of the invented filtration fabric increases the effectiveness of the wastewater treatment while ensuring that no microorganisms are bearing out.

4) During the working process of the system, the microorganisms cover the threads.

Meanwhile, as a result of the hydraulic resistance of the static filter threads, the stream of the wastewater, which passes by the filtrating element, pulls out the dynamic threads causing an increase in the overall filtrating surface. Hence, the more the stream resistance increases, the more the dynamic threads are pulled out as illustrated in FIG. 2.

On the other hand, as it is illustrated in FIG. 3, when the stream pressure is reduced the dynamic threads are folded. That way the filtrating surface is reduced while enabling a larger quantity of microorganisms to remain in the folds of the filter's dynamic elements, where it's aerobic stabilization occurs.

5) In any of the cases mentioned above, the speed of the stream in various points of the fabric filter is more or less the same. Moreover there is a repeating wash of warp threads with bacterial culture, a thing that extremely increases the treatment effectiveness.

That way, the Oxygen supply conditions to the cultures is increased, what is one of the main demands, which grant an effectiveness of the wastewater treatment.

In addition, the decrease in the stream's speed, while it passes by the filtrating element, increases remarkably the adhesion of the bacterial culture to the warp threads; it is also increased by making the warp threads from a material that has a capability of high adhesion with the bacterial culture.

6) When putting the material with the cells, created by woof and warp stripes, inside the filtrating element's frame, the united framed construction is connected in two parallel directions, what grants the fabric a higher mechanical strength.

The varying density of warp threads in the fabric, also provides a mechanical strength, and grants the needed degree of wastewater purification under certain hydraulic pressure.

The use of warp volumetric processed threads, as the threads where the bacterial culture is planted, also grants safe bacteria retention on the surface.

The production of woof and warp threads, which made of synthetic water-resistant filaments, grunts a long period of exploitation of the fabric in water environment. It also grunts a low shrinkage of those threads enabling to keep the starting tension of the fabric when putting it into the filtrating element.

INDUSTRIAL APPLICABILITY : In order to apply the invention, there is a need to adjust each device, which is built, according to the needed quality and quantity level of the purified water. In any case though, the filtration fabric contains stripes of warp threads, interchanged by limiting cells in the parallel direction of the material.

As already mentioned above, the stripes of warp and woof threads are in a width of a few cm (depending on the size of each device), while the long warp threads are of various lengths and of various linear densities. Those dimensions are varying from one device to another, in regard of the quality and the amount of the treated wastewater.