Water Treatment
Treats dredging and wash water to meet discharge standards.
Safely managing dredging and wash water with
secondary-pollution control technology
Dredging-water treatment controls suspended solids, fine sludge and wash water generated during sediment processing through settling, coagulation, dewatering and filtration, preventing off-site contaminant spread.
Soil Resources integrates dredged-soil collection, Soil Washing, sludge dewatering and effluent management into one continuous water-treatment process. Treated water is managed within applicable limits and, where practical, reused as wash water to reduce water consumption and secondary-pollution risk.
Why Dredging-Water Treatment Matters
Fine sludge and suspended solids are generated during contaminated-sediment collection. Without proper treatment, dredging itself can spread pollution, making water treatment essential to the quality of environmental dredging.
Suspended solids and fine sludge are separated by settling, coagulation and dewatering for stable effluent quality.
Process water is reused where site conditions allow, reducing water consumption and the risk of secondary pollution from discharge.
Fine sludge separated during water treatment is recovered as dewatered cake and routed to stabilization and soil improvement.
Dredging-Water Treatment Process
Dredging and wash water pass through settling, coagulation, solid-liquid separation, dewatering and filtrate treatment to produce treated water and sludge cake.
Contaminated water generated by dredging and washing is collected into the treatment system.
Fine particles and suspended solids are settled, with coagulation used as needed to improve separation.
Supernatant and sludge are separated; water proceeds to further treatment and sludge to dewatering.
Sludge is recovered as dewatered cake and filtrate is retreated to meet water-quality standards.
Treated water is reused for washing or discharged after confirming compliance.
High-Performance Water Treatment
Dredging water must be treated before discharge in accordance with project specifications. High removal efficiency for SS, BOD and other parameters helps prevent contaminant spread.
SS: treated to within +15 ppm of on-site raw-water baseline
| Parameter | Aggregate Wash Water | Treated Water | Removal Efficiency |
|---|---|---|---|
| BOD | 34.00mg/ℓ | 4.70mg/ℓ | 86.2% |
| CODMn | 231.00mg/ℓ | 10.20mg/ℓ | 95.6% |
| Suspended Solids | 2,610.00mg/ℓ | 6.00mg/ℓ | 99.8% |
| Cu | 0.66mg/ℓ | 0.02mg/ℓ | 97.0% |
| Cd | 0.04mg/ℓ | Not Detected | 100.0% |
Dredged-soil treatment in the Paldang Water Source Protection Area
