Reuse system for car wash water by flocculation, cellulose acetate (CA) ultrafiltration membrane and activated carbon treatments was developed. Multi-blended flocculating agent containing bentonite, Al
2 (SO
4)
3, sodium alginic acid and cationic polyacrylamide showed higher removals of COD and turbidity for waste car wash water compared with inorganic flocculating agent such as Al
2 (SO
4)
3 or polymeric flocculating agent individually. Practical scale experiment with membrane area of 48 m
2 were conducted under the membrane pressure of 20 kPa. When waste car wash water was treated by this multi-blended flocculating agent of 50 mg/
l, permeation flux through the CA membrane showed 1.0 m
3/ (m
2· day) for more than 6 months. The BOD, COD and extract by n-hexane values of reuse water were 2.5 to 14.0 mg/
l, 3.7 to 15.7 mg/
l and below 0.5 mg/
l, respectively.
抄録全体を表示