The wastewater is including chromate wastewater, nickel-containing wastewater，and comprehensivewastewater(Ground wastewater, complex wastewater, heavy metal cleaning water).
The water quality:
Water type | Water quantity | pH | Ni | Cr | COD | Zn | Cu | Total hardness | Conductivity |
TPH | - | mg/L | mg/L | mg/L | mg/L | mg/L | mg/L | us/cm | |
chromate waste water | 10 | 2-6 | - | 400 | 100 | - | - | 100 | 5000 |
nickel-containing wastewater | 5 | 2 | 400 | - | 100 | - | - | 100 | 5000 |
comprehensive wastewater | 35 | 2 | - | - | 1000 | 300 | 300 | 500 | 7000 |
The reuse water standard:
Parameter | COD | TDS | Conductivity |
mg/L | mg/L | us/cm | |
value | 20 | 250 | 350 |
The treatment process：
Three kinds of wastewater were pretreatedrespectively，and then mixed.
Mixed wastewater treatment process:
Mixed water+ O/MBR+ normal RO+ highpressure RO+SUPER RO+MVR