WO2005048700A2

WO2005048700A2 - Method of purification of water in pools for breeding of living organisms and system for implementation thereof

Info

Publication number: WO2005048700A2
Application number: PCT/LV2004/000009
Authority: WO
Inventors: Sergejs Tracuks
Original assignee: Sergejs Tracuks
Priority date: 2003-11-21
Filing date: 2004-11-22
Publication date: 2005-06-02
Also published as: WO2005048700A3

Abstract

The present invention relates to purification of water in pools and can be used in fish-farming complexes. In pool 1, provided with pump 10, there is disposed system of sectional filters 2 with separating partitions 3. Mesh 5 forms relative bottom for filling of filters 2 and together with bottom of bio-reactor creates discharge canal 6 for sludge. System comprises also discharge device 8 and intake device 9. When pump is switched on, it creates a difference in water level in pool. Intake device 9 is kept open and water flows into sections of filters 2 in direction a. Elastic valves 7 in canal 6 are kept pressed to the bottom of biofilters. Discharge device 8 is kept closed and sediments and dirt are drained through mesh 5 into canal. When pump is switched off and intake device is closed, discharge device is opened. Water flow is turned to direction b, opening flexible valves in canal, removing sediments and flushing bottom of canal .

Description

METHOD OF PURIFICATION OF WATER IN POOLS FOR BREEDING OF LIVING ORGANISMS AND SYSTEM FOR IMPLEMENTATION THEREOF

This invention relates to purification of water in pools with closed water-supply system for breeding of living organisms and can be used for purification of water in agricultural and fishfarming complexes. Collecting and removing of sludge is one of the most important problems in operation of any water-farming plant with a closed water-supply system, as increase of sludge concentration, its accumulation worsens purification of water and can disbalance the plant. Accumulation of sludge in biofilter as a result of filtering over a long period of time hinders continuous work of filters, often requires interruption of the purification cycle for carrying out mechanical cleaning of the biofilters and discharge channels. Method and equipment (EP0015321A1) of prior art are known, wherein a two-sectional biofilter is used to purify water, each section having a base in a form of a cone-shaped funnel for sedimentation and collection of sludge and a valve, closing the exit from the funnel to a pipe of discharge channel. Valves open periodically or when certain volume of sludge is collected. Disadvantage of this method and equipment for water purification is that it is difficult to control cleanness of the filter, discharge of sludge can hardly be regulated with a mechanically opened valve, moreover, while the sludge is being removed part of the filter filling can be lost and, finally, the price of such equipment used in accordance with the method of prior art is high. An equipment (DE 3827713 Al) of prior art is known, wherein the bottom part of the biofilter is separated from the filling of the biofilter by a partition of mesh and has a form of a truncated cone tapering downwards at the very bottom of which a sludge collector is installed, from where the sludge is removed by means of a slurry pump. Such an equipment allows to improve separating of sludge and excludes removing of filter filling together with the sludge from the biofilter. However, in order to flush of such system a full stop of purification process and removing of filling from the biofilter is required. It has formerly been proposed also a plant of prior art for fish breeding (app. LV13066A). All elements of the purification system of the plant are placed in one pool with a reservoir for fish. Sections of the filters for purification are in rectangular form provided with a zigzag- shaped passage for water and cone-shaped funnel in a base of each section in order to allow the sediment to settle and discharge of sludge into the discharge canal, which is disposed under the pool and is accumulating the sludge from the settling basin and the reservoir for fish. However, this equipment of prior art also has a further disadvantageous feature of removing of concentrated sediment from the canal and prevention of overgrown thereof. The present invention has for its object to solve the problem of regulation of sludge discharge and flushing of the discharge channel in a united cycle of purification of water in the system. In conformity with the invention there is provided a method for purification of water in a pool with a close,d water-supply system for breeding of living organisms, which includes forced passing of water by means of a circulating pump through filters, at least through a biofilter or through mechanical and biofilters, collecting and removing sludge from filters into a discharge canal through a discharge device, wherein it is proposed that sedimentation of sludge is effected through a separating mesh, which is disposed under the filters, but alternating of sludge sedimentation operation to its removing operation from the discharge canal is carried out by means of an intake device and elastic valves, that are placed in the discharge canal as extensions of partitions of biofilters. The distinctive feature of the proposed method of purification of water in a pool with a closed system of water-supply is that the sedimentation and discharge of sludge from the pool is carried out in a united purification system by means of an intake device and elastic valves. In order to effect the purification the polluted water is forced to pass through filters while the intake device is open and discharge device is closed, whereas when discharging the sludge from the discharge canal, the discharge device is opened and intake device is closed. A system implemented according to the proposed method for purification of water in a pool which contains sectional filters for purification of water, at least a biofilter, or a mechanical and a biofilter, with partitions furnished at different levels, and means for forced circulation of water, for example, a pump, according to invention is provided in addition with an intake device, a separating mesh disposed under the filters, and elastic valves. Separating mesh which is disposed under the filters for purification of water serves as a relative bottom for the filling of the filters and forms a sludge canal. Elastic valves are disposed in the sludge canal as extensions of the partitions of filters so that when the intake device is open in a working condition of the purification system they make available to close the discharge canal and separate the sections of biofilter, but when intake device is closed - to open sludge canal in order to effect discharge of the sludge and flushing of the canal. The invention is illustrated by the accompanying drawings, where on fig.l is shown the general diagram of implementation of the system for purification of water, collection and removing of sludge from a pool; on fig. 2 - a scheme of alternation of procedures in purification of water. As shown on fig.l in a pool 1 (fig. 1) there is disposed a system of sectional filters 2, including mechanical and biofilters for purification of water in a closed water supply system. System of filters 2 comprises a set of rectangular sections with separating partitions 3 and passages 4 furnished on different levels for flow of water. Separating mesh 5 forms a relative bottom for the filling of the filters 2 and together with the bottom of the bio-reactor creates a discharge canal 6 for sludge, where elastic valves 7 are mounted at separating partitions 3. Purification system comprises also a discharge device 8 and an intake device 9. System is provided with a circulating pump 10. Method of purification of water, collection and removing of sludge from the system is carried out in the following way. Circulation of water in the pool 1 is effected by means of a pump 10. When the circulation pump 10 is switched on, this operation creates a difference in levels of water in pool 1. The intake device 9 is kept open and the stream of water from reservoir for fish flows into sections of filters 2. In this kind of operation polluted water flows in zigzag mode through filters 2 in direction a (fig. 2). At this time the level of water in zone I is higher than in zone II and the valves 7 are kept pressed to the bottom of the bio-reactor owing to pressure of water stream. Thereby the elastic valves 7 take a position as extensions of filters' partitions 3 and hermetically close water passage from zone I to zone II (fig. 2). At the same time the discharge device 8 is kept closed. Sediments and dirt are drained through separating mesh 5 and collected into the sludge discharge canal 6. In order to discharge the sludge from the canal 6, the pump 10 is switched off and there are effected actions of closing of intake device 9 and opening of discharge device 8. Consequently stream of water is turned in direction b, at this time the level of water in zone II becomes higher than in zone I, therefore the flexible valves 7 are lifted and they open cavity of canal 6 for the water stream, which removes sediments, dirt and sludge and flushes the bottom of the canal. Technical and economical advantages of the proposed system and method of purification of water, collection and removing of sludge from the bio-reactor are the following: - in order to discharge sediments and to effect flushing of the bio-reactor no special equipment, additional devices or energy is needed. Flexible valves and other parts of the system can be made of a wide range of available materials. Removing of the sludge is effected in a united system of purification of water and sludge collection and it is accomplished, when necessary, within a short-time shut-down of the purification cycle. The proposed system economically is very cheap, its mounting and maintenance is easy, and it is effective in fulfilment of the raised problem.

Claims

1. A method of purification of water in a pool with a closed water-supply system for breeding of living organisms, which includes forced passing of water by means of a circulating pump through filters, at least through a biological filter, or through mechanical and biological filters, collecting and removing of sludge from filters to a sludge canal and removing of the sludge from the sludge canal through a discharge device, characterized in that a sedimentation of the sludge from filters to the sludge canal is effected through a separating net disposed under the filler of the filters, but alternation of sludge sedimentation operation to its removing operation from the sludge canal is. carried out in a united regime of water purification by means of an intake device and elastic valves disposed in the said sludge canal.

2. A method as defined in Claim 1, wherein in order to effect the purification the polluted water is forced to pass through filters while intake device is open and discharge device closed, and at the same time the elastic valves are hold down to the bottom of the sludge canal separating the sections of the filter, whereas when discharging the sludge, discharge device is opened and intake device closed, but elastic valves are lifted up by the pressure of water stream discharging the sludge through the opened sludge canal.

3. A system for purification of water in a pool with a closed water-supply system for breeding of living organisms, comprising sectional filters, for example, mechanical and biological filters with partitions furnished at different levels, means to force water circulation, for example, a pump, characterized in that in order to effect collection and removing of sludge, it is provided with a separating net disposed under the filters and with an intake device and elastic valves, making available regulation of alternative functions of water purification and discharging of sludge.

4. A system for purification of water as defined in Claim 3, wherein separating net for collection of sludge is disposed under the filters in a such way to create a relative bottom for filling of filters and to form a discharge canal for sludge.

5. A system for purification of water as defined in Claim 3 or 4, wherein the elastic valves are disposed in the sludge canal as extensions of partitions of filters so, that they hold the sludge canal closed and the sections of the filter separated while the intake device is open in working condition, but when the intake device is closed, they open, making available discharge of the sludge through canal and flushing the sludge canal with water stream.