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Product Description
90 Persons Marine Blackwater and Graywater Treatment Equipment
Product Introduction:
The DY-90 is a compact, fully automatic marine sewage treatment equipment engineered to serve vessels with an onboard complement of up to 90 persons. With a daily treatment capacity of 6,300 liters, equivalent to 6.3 cubic meters per day, this system is ideally suited for medium to large merchant vessels, passenger ferries, offshore support vessels, research ships, and naval auxiliary craft.
The equipment integrates biological contact oxidation, membrane bioreactor technology, and ultraviolet disinfection to deliver superior effluent quality that consistently meets the most stringent international marine discharge standards. Built for reliability and operational simplicity, the DY-90 minimizes crew intervention while ensuring full regulatory compliance.
Treatment Process:
The DY-90 follows a three-stage treatment sequence. Raw sewage first enters the aeration chamber where aerobic bacteria actively consume organic matter. The biologically treated liquor then passes through membrane bioreactor modules that remove suspended solids and microorganisms through ultrafiltration. Finally, ultraviolet irradiation eliminates any remaining pathogens, producing clear, disinfected effluent ready for overboard discharge without chemical additives.
Effluent Quality and Compliance:
The equipment is designed and type-approved in full compliance with IMO Resolution MEPC.227(64) and MARPOL 73/78 Annex IV. Treated effluent consistently achieves total suspended solids of 35 milligrams per liter or less, biochemical oxygen demand of 25 milligrams per liter or less, and chemical oxygen demand of 125 milligrams per liter or less. Coliform count remains at or below 100 per 100 milliliters, with pH maintained between 6.0 and 8.5, and residual chlorine below 0.5 milligrams per liter.
Outline Drawing:
System Schematic Diagram:
Technical Specifications:
| Model | DY-90 | |
| Hydraulic Load | L/d | 6300 |
| Organic Load | (kg/d BOD₅) | 3.15 |
| Power Supply | Customizable | AC220V/AC380V/AC440V |
| Certificate | Standard | MEPC.227(64) And GB3552-2018 Article 5.2.2 and 5.2.4 |
| Total Power | kW | 4.0 |
| Overall Dimensions | L(mm) | 1900 |
| W(mm) | 1465 | |
| H(mm) | 1920 | |
| Net Weight | kg | ~1010 |
Main Components:
The system includes a macerating pump for influent shredding, an aeration blower for oxygen supply, membrane bioreactor modules for filtration, an ultraviolet sterilizer for disinfection, an effluent discharge pump, and a fully integrated electrical control box. All components are mounted on a common base frame, simplifying installation and alignment.
Operational Advantages:
The DY-90 offers automatic operation requiring minimal crew attention. The membrane bioreactor design significantly reduces sludge production, lowering disposal frequency. Compact footprint and robust construction ensure dependable performance in the marine environment while simplifying installation in space-constrained engine rooms.
Conclusion:
The DY-90 Marine Sewage Treatment Equipment provides shipowners and operators with a reliable, fully compliant solution for onboard sanitation management at 6,300 liters per day. Advanced treatment technology, comprehensive certification, and low-maintenance operation ensure environmental compliance and peace of mind throughout the vessel's service life.
