| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a comfortable circulation hot bath unit which can be stably operated without generating odor or the like even in an initial stage of operation, and in which immobilization of microorganisms for starting up biological treatment can be speedily performed. SOLUTION: A circulation hot bath unit is provided with a circulation pump 4 to circulate bath water, a heater 5 to keep heat at bath water circulated by the circulation pump 4, a filter unit 3 on which a filter is installed for filtering foreign matter in circulated bath water, and a biological treatment tank 6 including filtration stones 20 to treat filtered bath water with microorganisms, and it is also provided with a hypochlorite ion elimination device which gets in contact with bath water supplied to the biological treatment tank 6 to decompose hypochlorite ions in bath water. It is also provided with an additing device to add immobilization accelerating agent with which organisms in bath water can be flocculated to form transitional microorganism carriers.</p> |
