WO1989011454A1

WO1989011454A1 - Method for treatment of water and device for application of method

Info

Publication number: WO1989011454A1
Application number: PCT/FI1988/000074
Authority: WO
Inventors: Eero Partanen
Original assignee: Eero Partanen
Priority date: 1988-05-16
Filing date: 1988-05-16
Publication date: 1989-11-30

Abstract

The object for the invention is a method and a device for treatment of water. In the method in accordance with the invention the scavenging of the filter (1) takes place with compressed air in the counter-current direction inside the filter, when at the same time happens the aeration of the well concerned or of the intermediary depot (7) of the water. This water space is functioning at the same time as the functional space for the biological process, whereat the masses added and the feculence formed in the device are functioning as the culture medium for the water treatment and the function of the device. The device in accordance with the invention is a filter (1) to be placed on the unpressurized side (7) of the water acquisition system, which filter contains in addition to a mechanical filter (3) also a biological, chemical or other function causing filtration (2).

Description

METHOD FOR TREATMENT OF WATER AND DEVICE FOR APPLICA¬ TION OF METHOD

The object for the invention is a method for treatment of water. In addition the object for the invention is a de¬ vice for application of the method.

Particularly due to the often poor oxygen content of the groundwater the iron and the manganese are common noxious factors in the water, because when they come in contact with the air they get easily oxygenized. The in such a way created feculence makes the houseware dirty and maculates the laundry. Sometimes the iron and the manganese can be removed by aeration or by simple mechanical filtration, but sometimes again more efficient purification methods are needed, such as chemical or biological proceedings. Problems in the use of water are often also caused by nitric compounds (NO-) and in the water existing gases, such like as for instance methane, hydrogen and C0_~-gases.

From before water treatment methods and devices are known, out of which some just aerate and filtrate the water, when in others again the water is treated chemically or biologi¬ cally. Each method and equipment is generally intended to cover only a certain part field of the water treatment. The most methods and devices are based on a method under pressure, whereat the obnoxious gases remain in the pipage and are discharged only then,when the water is flowing out from the outlet tap. The problem with the devices are the short intervals between the maintenances due to an obstruc¬ tion or some other reason. Additionally all devices require warm location in a residential or some other building as well as space for the maintenance.

The aim of the invention is to bring about a method for treatment of water, by which method the disadvantages con¬ nected with the present methods are eliminated. In par- ticular the purpose fo the invention is to bring forth a method, by taking advantage of which the obnoxious gases are not let into the pipage, the function of the purifica¬ tion process is improved, and no actual device or water treatment space is needed. Additionally the aim of the in¬ vention is to bring forward a device for application of the method, which device is uncomplicated to its structure and the maintenance interval of which is long.

The purpose of the invention is achieved with a method and a device, which are characterized by that, what has been presented in the patent claims.

According to the invention, with an aeration device posi- tioned inside a filter in the water space pressurized air is led into the water space, and by means of the pressuriz¬ ed air and water the filter is scavenged in the counter- current direction and simultaneously the water in the water space and the filter are oxygenized. As the device is plac- ed in the well or in an intermediate depot of water no se¬ parate space for the device and the water treatment process is needed, but the purification process takes place in the well or in the intermediate depot of water and in the de¬ vice itself. The scavenging in the counter-current direc- tion with compressed air together with the water prevents efficiently the filter from obstructions and simultaneously the water aeration is taking place in an efficient way in the whole process space. The aeration promotes the discharge of the obnoxious gases, because the obnoxious gases can freely burst in the water and they do not enter into the pipage,. Consequently the water going in for the use is well aerated and e.g. the corrodent properties of the water have diminished and for instance the nitric compounds (NO-) are changed into less obnoxious (NO-) compounds. When using the device it also has been verified, that the function of the purification process improves when the amount of fecu¬ lence increases into the well or into the intermediate depot so that the maintenance interval can be long, and even as much as 2-3 years.

In a favourable application of the invention the air is led inside the filter finely divided. Hereby the air is efficiently cleaning the filter and oxygenizing the water.

According to the invention the filter is favourably placed in the beginning of the water intake system in the immedi- ate neighbourhood of the dump valve or the suction inlet. The filter filtrates the water going into the pipage and aerates the water in the other water space.

According to the invention into the filter or into the water space contact materials are favourably added, which together with the oxygen rich water improve the result of the treatment process, and whereat as the process space is functioning in addition to the filter the whole water space with its bottom and the walls. For the purpose are used as such known, for the purpose suitable materials, with the help of which the quality of the water is improv¬ ed.

In the following the invention is explained more in detail by referring to the attached drawing, in which figure 1 presents one application of the device for apply¬ ing of the method in accordance with the invention seen from the side and in cross-section, figure 2 presents the device in accordance with figure 1 seen from above, figure 3 presents the device in accordance with figure 1 mounted in a well and seen from the side, and figure 4 presents the device in accordance with figure 1 mounted in a well and seen from above.

In an application in accordance with the figures 1-4 to the device belongs a filter 1, the hull of which in this application is made of perforated metal sheet, inside the filter placed aeration device 5 and around the dump valve 4 placed framework 6. Inside the hull of the filter has been placed the biological and/or chemical part 2 of the filter and between this and the inner part, where the aeration device is, has been placed the mechanical part 3 of the filter. On the framework placed around the dump valve has also been placed a mechanical part of the filter. The aeration device 5 is reaching outside the water space and it is connected with the apparatus, by means of which the compressed air is blown into the water space. The part of the aeration device located inside the filter is equipped with media, e.g holes, for feeding of the air finely divid¬ ed into the inside of the filter. As the frame of the inner part is functioning a within the filter of the aeration device reaching, in this application a tubular and with holes equipped spiral. The dump valve is spring loaded.

As the filtration material of the biological and/or chemi¬ cal filter is generally used expanded clay, limestone crush, -stone or ore crush and/or activated carbon or dif¬ ferent materials in layers or mixed. As the mechanical fil¬ ter part 3 materials suitable for the purpose like fil¬ tration fabrics or corresponding are used.

In figures 3 and 4 the device is placed in the water space, which in this application is a well. In the figure are pre¬ sented the well 9, its water space 7 and the suction tube 8 for pumping of the water from the well. The water from the well is pumped through the filter parts of the device in accordance with the figures 1 and 2. The filter placed around the dump valve is cleaned by the pulses of the dump valve and by on the outside of it circulating water-/air- ixture during the aeration and inside it can in some ap¬ plications also in case of need be directed a jet of com- pressed air. The outer mechanical filter part 3 and filter part 2 are cleaned with compressed air directed inside the filter through the aerator, and when it and from the inside of the device discharging water penetrate through the fil¬ ter in the counter-current direction. The feculence form¬ ing out of the filter into the process space promotes the biological purification function and to begin with the bio- logical process can be activated quickly by means of for instance iron and manganese bacteria plantations. The aer¬ ation of the water space is periodical in accordance with the need and it can be for example _ - 1 hour a couple of times within 24 hours. The periodic operation can easily be controlled e.g. by means of an electric control clock.

The invention is not limited to the application presented, but it can vary within the frames of the patent claims.

Claims

PATENT CLAIMS

1. Method for treatment of water, c h r a c t e r i z - e d in, that with an aeration device (5) positioned inside a filter (1) placed in the water space (7) press¬ urized air is led into the water space and with press- urized air plus water the filter is scavenged in the counter-current direction and the filter and the water in the water space are oxygenized.

2. Method in accordance with the patent claim 1, c h a r a c t e r i z e d in, that the air is led inside the filter finely divided.

3. Method in accordance with the patent claims 1 and 2, c h a r a c t e r i z e d in, that the filter is placed in the beginning of the water intake system in the immedi¬ ate neighbourhood of the dump valve (4) or the suction inlet.

4. Method in accordance with some of the patent claims 1 - 3, c h a r a c t e r i z e d in, that into the filter or in the water space contact materials are added, which together with the oxygen rich water improve the re¬ sult of the treatment process, whereat as the process space in functioning in addition to the filter the whole water space with its bottom and its walls.

5. Device for application of the method in accordance with the patent claim 1, c h a r a c t e r i z e d in, that to the device belong a filter (1) positioned in the water space (7) placed in the neighbourhood of the dump valve (4) or the suction inlet and an inside the filter placed aeration device (5) , which is arranged to reach outside the water space and to transfer pressurized air inside the filter.

6. Device in accordance with patent claim 5, c h a r a c t e r i z e d in, that the part of the aeration device, which is inside the filter, is equipped with media for feeding of the air finely divided inside the filter.

7. Device in accordance with the patent claims 5 or 6, c h a r a c t e r i z e d in, that to the filter belongs a biological and/or chemical filter part (2) and an inside this placed mechanical filter part (3).

8. Device in accordance with patent claim 7, c h a r a c ¬ t e r i z e d in, that as the filtration material is used expanded clay, limestone crush, stone or ore crush in gen¬ eral or activated carbon or different materials either in layers or mixed.