| 摘要 |
<p>PURPOSE:To prevent the deterioration of decomposition efficiency and catalyst and damage to reactor and water exhaust pipe by designating pH of waste water and oxidized water in the treatment of NH3-containing waste water by a wet oxidation method using a catalyst such as Fe-Ni(compound), etc., at specific temperature and pressure. CONSTITUTION:An NH3-containing waste water of pH 8-11.5, preferably 9-11, is pressurized through the pipe 2 from the tank 1 by the pump 3 and then heat exchanged in the heat exchanger 5. Then, it is mixed with the O2-containing gas 10 and then introduced into the reacting tower 12 packed with a catalyst, e.g., Fe-Ni-Co(compound), etc., where the temperature of the waste water is kept at 100-370 deg.C and the amount of O2 is also kept at a level 1-1.5 times a theoretical amount necessary for decomposing NH3 or organics(or inorganics) present in waste water. Also, an alkali solution from the storage tank 21 is supplied through the pump 23 to the reacting tower 21 so as to regulate the pH of the treated water to approx. 5-8. On the other hand, the treated water 13 is subjected to the vaporliquid separation 14 and the treated water 15 is sent to the humidifier 9. And, the gas 19 is heat exchanged and then reduced its pressure to the atmospheric pressure for exhaustion from the pipe 20.</p> |
