Scrubber Wash Water

MARITIME – POLLUTION PREVENTION & ENVIRONMENTAL CALCULATOR Scrubber Wash Water A precise tool.
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What is the Scrubber Wash Water & How does it work?

Marine exhaust gas cleaning systems, commonly called scrubbers, use seawater to wash away sulfur oxides and particulate matter from ship exhaust. The wash water becomes contaminated with oil, grease, and other residues that must be managed to avoid marine pollution.

International regulations allow the over‑board discharge of scrubber wash water only when the oil concentration does not exceed a prescribed limit (typically 15 ppm). Operators therefore need to calculate the permissible discharge rate based on the actual oil content of the wash water.

The discharge rate is derived by scaling the total wash‑water flow to the ratio of measured oil concentration to the allowable limit. This ensures that the amount of oil released to the sea stays within legal limits while maintaining efficient scrubber operation.

Q_{discharge}=Q_{wash}\times\frac{C_{oil}}{C_{limit}}
Q_{discharge} = discharge rate (m³/h)
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Parameters
Result —
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Frequently Asked Questions
What is the maximum allowed oil concentration in scrubber wash water?
The International regulations allow an oil concentration of up to 15 ppm (parts per million) for over-the-board discharge.
How do I calculate the permissible discharge rate of scrubber wash water?
To calculate, you need to know the volume of wash water and its oil concentration. Divide the total oil content by 15 ppm to find the maximum discharge volume.
What happens if the oil concentration in scrubber wash water exceeds 15 ppm?
If the oil concentration is above 15 ppm, the wash water cannot be discharged overboard and must be treated or stored on board the ship.
Can I discharge scrubber wash water into a port or harbor?
Discharge into ports or harbors may be restricted by local regulations, so it’s important to check specific port requirements in addition to international standards.
How often should I monitor the oil concentration in scrubber wash water?
Regular monitoring is recommended, typically during each use of the scrubber system, to ensure compliance with discharge regulations.
What are the consequences of non-compliance with marine exhaust gas cleaning regulations?
Non-compliance can result in fines, legal action, and damage to a ship’s reputation. It’s crucial to follow all international and local regulations.
Can I use freshwater instead of seawater for scrubber wash water?
While possible, using freshwater may not be practical due to its limited availability on ships. Seawater is generally preferred for its abundance and effectiveness in cleaning exhaust gases.

Results are for informational purposes only and do not constitute professional advice.