| 摘要 |
<p>PROBLEM TO BE SOLVED: To solve a problem that a device becomes a large size and is disadvantageous in a cost, the device has a problem for a safety and an environment since chemicals influencing to a human body is used and a combustion device is used and a removal efficiency of the device is not satisfied. SOLUTION: Free hydrogen sulfide in a sewage treating tank 11 is detected by a gas concentration sensor 12 and an electric signal is electrically fed to a control device 13. In the case where a concentration of the hydrogen sulfide becomes a defined concentration or more, the control device 13 feeds an enzymatic raw liquid in an enzymatic preparation raw liquid tank 14 to a mixing tank 15. The enzymatic raw liquid is mixed with water to adjust a predetermined enzymatic concentration, a high pressure pump 16 is operated to spray an aqueous enzymatic solution 18 from a spray nozzle 17 provided at two positions of the sewage treating tank 11. The sprayed aqueous enzymatic solution is contacted with the hydrogen sulfide to decompose/remove it.</p> |
