WASTE LIQUID RECYCLING SYSTEM

摘要

In a reverse osmosis membrane device (9) a waste liquid is separated into concentrated water which contains metal ions etc. and water which does not contain such ions etc. The water separated with the reverse osmosis membrane device (9) has such quality that the water has a pH of 6.5 7.5 a chlorine concentration of 15 ppm or less a conductivity of 110 µs/cm or less and a COD of 13.3 ppm or less which are on the water quality level for industrial water. Hence the water separated with the reverse osmosis membrane device (9) is sent to a pure water device (10) where the water is mixed with fresh industrial water. The mixed water is subjected to painting pretreatment water washing and electrodeposition water washing.