Spa water circulation system

Abstract

The invention relates to a spa water circulation system and a method of circulating spa water. The water consumption at a spa as well as at a swimming hall consists of both pool water and grey water, which is mainly shower water. Both waters are purified. The present invention provides an economical solution for purifying both these waters by circulating the waters through two purification systems which are connected to each other and through which even the filter wash waters may be circulated.

1 . A spa water circulation system, which comprises a first purification system, which is connected to a pool and comprises a first biological purification unit and a first filtration unit, and a second purification system, to which grey waters of the spa are connected and which comprises a second biological purification unit and a second filtration unit, which is connected to the pool.  
     
     
         2 . A water circulation system according to  claim 1 , wherein the second filtration unit is connected to the pool via the first purification system.  
     
     
         3 . A water circulation system according to  claim 1  or  2 , wherein the filtration units and are further connectable to the pool so as to allow, when necessary, water flow from the pool to the filtration unit against the current so that the filtration unit can be cleaned, in which case the filtration units are further connectable to the second biological purification unit for leading filter wash waters there.  
     
     
         4 . A water circulation system according to  claim 1 , which further comprises a balancing reservoir, which is connected between the pool and the first purification system, a buffer reservoir, which is connected between the first and the second purification system, and a buffer reservoir for clean water, which is connected between the second purification system and the balancing reservoir.  
     
     
         5 . A water circulation system according to  claim 4 , wherein the balancing reservoir is further connectable to the filtration units against the current.  
     
     
         6 . A water circulation system according to  claim 1 , wherein the biological purification units include the bacteria Bacillus sp. DT-1 (DSM 12560),  Pseudomonas azelaica  DT-2 (DSM 12561), Rhizobium sp. DT-5 (DSM 12562),  Pseudomonas azelaica  DT-6 (DSM 13516), Azospirillium sp. DT-10 (DSM 13517),  Ancylobacter aquaticus  DT-12 (DSM 13518) and Xanthobacter sp. DT-13 (DSM 13519).  
     
     
         7 . A method of circulating spa water, wherein pool water is circulated through a first purification system, which comprises a first biological purification unit and a first filtration unit, and grey water is passed through a second purification system, which comprises a second biological purification unit and a second filtration unit, from which purified water is led to the pool.  
     
     
         8 . A method according to  claim 7 , wherein purified water is led from the second filtration unit to the pool via the first purification system.  
     
     
         9 . A method according to  claim 7  or  8 , wherein, when necessary, water is taken from the pool to the filtration units against the current for use as wash water, and the used wash water is then led to the second biological purification unit.  
     
     
         10 . A method according to  claim 7 , wherein the pool water is first taken to a balancing reservoir, from which it is led either directly or via the first biological purification unit through the filtration unit of the first purification system and then back to the pool via a UV unit.  
     
     
         11 . A method according to  claim 9 , wherein grey water and filter wash waters are taken to a buffer reservoir of unpurified water, from which the waters are taken to the biological purification unit of the second purification system.  
     
     
         12 . A method according to  claim 7 , wherein the water that has passed through the second purification system is led to a clean water buffer reservoir, from which it is led to the balancing reservoir and from there to the first purification system.  
     
     
         13 . A method according to  claim 12 , wherein part of the water of the fresh water buffer reservoir is passed to another circulation system.  
     
     
         14 . A method according to  claim 7 , wherein the biological purification is performed by a mixed bacterial population, which includes the bacteria Bacillus sp. DT-1 (DSM 12560),  Pseudomonas azelaica  DT-2 (DSM 12561), Rhizobium sp. DT-5 (DSM 12562),  Pseudomonas azelaica  DT-6 (DSM 13516), Azospirillium sp. DT-10 (DSM 13517),  Ancylobacter aquaticus  DT-12 (DSM 13518) and Xanthobacter sp. DT-13 (DSM 13519).  
     
     
         15 . A spa water circulation system which comprises a first purification system, which is connected to a pool and comprises a first biological purification unit and a first filtration unit, and a second purification system, to which grey waters of the spa are connected and which comprises a second biological purification unit and a second filtration unit, which is connected to the pool via the first purification system, and 
 the pool water is further connectable to the filtration units against the current for cleaning the filtration unit, in which case the wash water coming from the filtration units is further connectable to the second biological purification water for leading the wash waters there.    
     
     
         16 . A method of circulating spa water, the method comprising 
 circulating pool water through a first purification system, which comprises a first biological purification unit and a first filtration unit, and taking grey water through a second purification system, which comprises a second biological purification unit and a second filtration unit, from which purified water is led through the first purification system to the pool, and    taking, when necessary, water from the pool into the filtration units against the current for use as wash water, and leading the used wash water to the second biological purification unit.