Pocheoncheon
A closed-loop wash-water reuse case that reduced secondary pollution.
Reusing wash water without direct discharge,
a closed-loop case reducing secondary pollution
The Pocheoncheon remediation project treated and reused wash water generated during dredged-soil washing, preventing secondary pollution from wash-water discharge.
Settling, coagulation and water treatment reduced BOD, COD, suspended solids and heavy metals, allowing treated water to be reused in the washing process and reducing discharge demand.
Remediation
Pocheoncheon Remediation Project
Feb 2006 – Dec 2007
SS Removal Efficiency
CODMn Removal Efficiency
Aggregate wash water is separately treated and returned to the washing process, reducing discharge volume and contaminant-spread risk.
Settling, coagulation and dewatering reduce suspended solids and contaminants for stable process operation.
Reusing wash water instead of discharging it untreated reduces impacts on the river and surrounding environment.
| Parameter | Aggregate Wash Water | Treated Water | Removal Efficiency |
|---|---|---|---|
| pH | 5.00 | 6.30 | - |
| BOD | 34.00 mg/ℓ | 4.70 mg/ℓ | 86.2% |
| CODMn | 231.00 mg/ℓ | 10.20 mg/ℓ | 95.6% |
| Suspended Solids | 2,610.00 mg/ℓ | 6.00 mg/ℓ | 99.8% |
| Pb | 0.15 mg/ℓ | 0.08 mg/ℓ | 46.7% |
| Cu | 0.66 mg/ℓ | 0.02 mg/ℓ | 97.0% |
| Cd | 0.04 mg/ℓ | Not Detected | 100.0% |
