4900L/d Marine MBR Sewage Treatment Plant
Product Description
4900L/d Marine MBR Sewage Treatment Plant
Product Introduction:
The DY-70 is a compact, fully automatic marine sewage treatment plant engineered for the treatment of black water and grey water generated aboard ocean-going vessels, offshore platforms, and naval ships. With a daily treatment capacity of 4,900 liters, equivalent to 4.9 cubic meters per day, this system is ideally suited for crews ranging from approximately fifty to seventy persons, making it an excellent choice for medium to large merchant vessels, passenger ships, and offshore installations.
The system employs an advanced treatment train combining biological contact oxidation, membrane bioreactor technology, and ultraviolet disinfection, delivering exceptional effluent quality that consistently meets the most stringent international marine discharge regulations. The DY-70 combines proven reliability with low maintenance requirements, providing shipowners and operators with a compliant and cost-effective solution for onboard sewage treatment.
Effluent Quality and Regulatory Compliance：
The DY-70 is designed and type-approved to operate in full compliance with the latest international maritime environmental regulations. The system meets the requirements of IMO Resolution MEPC.227(64), the Revised Guidelines on Implementation of Effluent Standards and Performance Tests for Sewage Treatment Plants, and fully complies with MARPOL 73/78 Annex IV regulations for the prevention of pollution by sewage from ships. The system holds the internationally recognized Certificate of Type Approval from China Classification Society, with certification options available for other major classification societies including DNV, ABS, LR, and BV.
The treated effluent quality from the DY-70 consistently achieves the following parameters: total suspended solids of 35 milligrams per liter or less, biochemical oxygen demand over five days of 25 milligrams per liter or less, and chemical oxygen demand of 125 milligrams per liter or less. The most probable number of thermotolerant coliforms is maintained at no more than 100 per 100 milliliters, with the pH value of the effluent ranging between 6.0 and 8.5. Residual chlorine is kept below 0.5 milligrams per liter, ensuring environmentally safe discharge.
Outline Drawing:
System Schematic Diagram:
Technical Specifications:
| Model | DY-70 | |
| Hydraulic Load | L/d | 4900 |
| Organic Load | (kg/d BOD₅) | 2.45 |
| 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 | 3.0 |
| Overall Dimensions | L(mm) | 1750 |
| W(mm) | 1360 | |
| H(mm) | 1770 | |
| Net Weight | kg | ~800 |
Structural Design and Construction：
The DY-70 is built with durability and marine environment resilience as primary considerations. The main treatment tank is fabricated from high-grade carbon steel with a comprehensive anti-corrosion coating system. The inner surface is protected with a thick epoxy glass flake coating that provides excellent resistance to the corrosive effects of sewage and chemical cleaners, while the outer surface is finished with an epoxy primer and top coat system for long-term protection against the aggressive marine atmosphere.
The tank interior is strategically divided by partition plates into three distinct chambers: the first contact oxidation tank, the second contact oxidation tank, and the membrane bioreactor tank. This multi-chamber design ensures optimal hydraulic retention times and treatment efficiency at each stage of the process.
The entire unit adopts a robust frame structure with all components installed on a common base. This integrated design allows for straightforward installation through bolted connection to the vessel's foundation, simplifying alignment and reducing installation time during newbuilding or retrofit projects.
Conclusion：
The DY-70 Marine MBR Sewage Treatment Plant represents a state-of-the-art solution for onboard sewage treatment with a capacity of 4,900 liters per day. By combining proven biological contact oxidation with advanced membrane bioreactor filtration and ultraviolet disinfection, the system delivers superior effluent quality that provides full compliance with IMO Resolution MEPC.227(64) and MARPOL Annex IV. With robust carbon steel construction, comprehensive certification, complete documentation, and reliable automatic operation, the DY-70 offers shipowners, operators, and classification surveyors the assurance of reliable environmental compliance and dependable performance throughout the vessel's operational life.