| 摘要 |
PURPOSE:To remove nitrogen, phosphorus, heavy metals, etc., from the processing waste so as to reduce their contents in the waste to low levels by subjecting the waste to noncatalytic wet oxidation treatment under specific conditions and to solid-liquid separation, then, subjecting the separated waste to catalytic wet oxidation treatment and thereafter, further subjecting the resulting treated waste to biological treatment consisting of a combination of aerobic and anaerobic treatments. CONSTITUTION:In this treatment, a dilute solution of this processing waste, a sodium hydroxide aq. solution and a gas contg. oxygen (air) are pressurized and introduced into a supply line 10 with a pump 3, pump 15 and compressor 5 respectively and then, heated by a heat exchanger 2 and thereafter, introduced into a noncatalytic wet oxidation tower 1 to subject the waste to oxidation treatment there. The resulting treated liquid is cooled and thereafter, fed into a gas-liquid separater 4 and the separated liquid is once stored in a tank 14 and then transferred to a solid-liquid separator 18 to subject it to solid-liquid separation there. The treated liquid thus separated is further subjected to catalytic wet oxidation treatment under conditions of a 140 to 370 deg.C temp. and a sufficient pressure to retain the waste to be treated in a liquid phase while supplying a gas contg. oxygen and subsequently, to biological treatment consisting of a combination of aerobic and anaerobinc treatments. |
