Anodizing Industrial Wastewater Treatment System for 300t/month Production Line with 230m³/day Capacity
- Total production wastewater: ≤230 m³/day
- Acid-base wastewater discharge: ≤200 m³/day
- Nickel-containing wastewater: ≤30 m³/day
| Contaminant | Temperature | pH | Mineral Oil | SS | Nickel |
|---|---|---|---|---|---|
| Unit | ℃ | — | mg/L | mg/L | mg/L |
| Concentration | ≤40 | 5.5-9.5 | ≤20 | ≤25 | ≤1 |
- Treatment capacity: ≤30 m³/day
- Continuous treatment operation
- Pre-treated nickel wastewater mixed with comprehensive wastewater meets discharge requirements
Nickel-containing wastewater flows from the workshop into the sump for homogenization, then is pumped to the duplex reactor. Reducing agents are added for thorough mixing reaction, followed by alkali addition to adjust pH to alkaline levels. PAM is introduced to create flocculent precipitation (alum formation).
After dosing reaction, wastewater flows into the sedimentation tank where suspended solids settle as sludge, while the supernatant flows to the alkaline wastewater tank for further treatment.
Sedimentation tank sludge is periodically discharged to the sludge concentration tank, then pumped to the filter press for dehydration. Dry sludge is bagged and handled by qualified units to prevent secondary pollution. Filtrate returns to the duplex reactor for reprocessing.
During normal operation, the treated nickel-containing wastewater mixed with comprehensive wastewater consistently meets all discharge standard requirements.
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