20 Person Sewage Treatment System

20-Person Marine Sewage Treatment System

Ensure full compliance with the latest international maritime environmental regulations without sacrificing valuable onboard space with our SWCM(I)-20 marine sewage treatment device system. This unit provides compact, reliable wastewater processing specifically engineered for vessels requiring a 20-person capacity (with a peak capacity of 22 persons). It is the perfect marine sanitation device for a wide range of vessels, including yachts, fishing boats, patrol vessels, and small commercial ships.

This advanced system combines proven advanced biological treatment with physical membrane filtration and chemical-free UV disinfection to deliver effluent that consistently meets or exceeds the stringent requirements of IMO Resolutions MEPC 227(64) and MEPC 284(71) . Every component is housed in a durable, marine-grade steel enclosure with an epoxy coating, ensuring long-lasting performance in the harshest saltwater environments.

The SWCM(I)-20 is a fully integrated, four-stage treatment process that requires minimal crew intervention. From the initial biological breakdown of waste to the final UV sterilization, the system is designed for maintenance-free operation, allowing you to focus on your voyage.

Key Features & Benefits

• Ultra-Compact Design: Its small footprint (1800 × 1450 × 1750 mm) makes it ideal for space-limited marine installations where every square meter counts.

• Four-Stage Advanced Treatment: Employs a robust process of biological oxidation, membrane bioreactor (MBR) filtration (0.1 micron), and UV sterilization to ensure superior effluent quality.

• Chemical-Free UV Disinfection: The integrated UV system eliminates 99.9% of bacteria and pathogens without the use of chlorine, eliminating the need to store and handle hazardous chemicals and avoiding chlorine residues in the discharge.

• Durable Marine-Grade Construction: Built from epoxy-coated steel with a sandblasted surface for maximum corrosion resistance, ensuring a long service life in the marine environment.

• Fully Automated Operation: Features an integrated control panel that manages all treatment processes, aeration, and backwashing, resulting in virtually maintenance-free operation for the crew.

• Globally Certified: Fully compliant with IMO MEPC 227(64) and 284(71). Available with IACS-approved certification from all major classification societies, including ABS, BV, CCS, DNV, LR, NK, KR, RMRS, and RINA.

Treatment Capacity & Performance

Effluent Quality (Exceeds IMO MEPC 227(64)/284(71) Standards)

Dimensions & Build Quality

Core System Components

Advanced Treatment Technology

1. Biological Digestion: Aerobic bacteria in the aeration tank actively break down organic pollutants (BOD/COD).

2. Membrane Bio-Reactor (MBR): Water passes through 0.1 micron filtration membranes, which physically remove all suspended solids, bacteria, and even some viruses.

3. UV-C Sterilization: The filtered water is exposed to 254nm wavelength UV light, which destroys 99.9% of pathogens without chemicals.

4. Anti-Fouling Design: An automatic backwash system periodically cleans the membrane surfaces, extending their service life and maintaining performance.

Certifications & Compliance

• Full Compliance With:

  • IMO Resolution MEPC 227(64)

  • IMO Resolution MEPC 284(71)

  • MARPOL Annex IV Regulations

• Optional IACS Certifications: Available with certification from ABS, BV, CCS, DNV, GL, LR, NK, KR, RMRS, and RINA.

Ideal Applications

• Small passenger vessels & luxury yachts

• Coastal patrol boats & fishing vessels

• Offshore platforms & workboats

• Research vessels & small cruise ships

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Frequently Asked Questions (FAQ)

1. What is the difference between IMO MEPC 227(64) and MEPC 284(71)?
MEPC 227(64) is the main resolution that sets the performance standards for marine sewage treatment plants, including effluent limits for carbonaceous and nutrient pollutants. MEPC 284(71) is a later resolution that primarily amended the testing guidelines and certification procedures for type-approved equipment, clarifying requirements for nutrient removal testing. Our SWCM(I)-20 is designed to meet the substantive effluent limits of MEPC 227(64) and is certified under the framework that includes MEPC 284(71).

2. What does “0.1 micron filtration” mean, and why is it important?
A 0.1 micron filter has pores that are 0.1 millionths of a meter in size. This is small enough to physically block all suspended solids, bacteria, and even some viruses from passing through. This is the core of the Membrane Bio-Reactor (MBR) technology. It ensures that the effluent is crystal clear and has TSS (Total Suspended Solids) levels far below the regulatory limit, without relying on chemical coagulants.

3. How does the UV disinfection system work without chemicals?
The UV sterilizer contains special lamps that emit high-intensity ultraviolet light at a specific wavelength (254nm). As the treated water flows past these lamps, the UV light penetrates the cells of any remaining bacteria or pathogens and damages their DNA/RNA. This effectively sterilizes them, preventing them from reproducing. It is a purely physical process that adds nothing to the water, hence chemical-free operation.

4. What maintenance is required for this “maintenance-free” system?
“Maintenance-free” refers to the daily operation requiring no manual intervention from the crew; the system is fully automated. However, like all mechanical equipment, periodic scheduled maintenance is required for long-term reliability. This typically includes:

• Annual UV Lamp Replacement: UV lamps lose intensity over time and should be replaced annually.

• Membrane Cleaning/Replacement: The MBR membranes may require chemical cleaning every 6-12 months and eventual replacement after several years, depending on usage.

• Routine Inspections: Periodic checks of pumps, valves, and control panel are recommended.

5. Which classification society certifications are available for this unit?
We can supply the SWCM(I)-20 with type-approval certification from virtually all major IACS (International Association of Classification Societies) members, including:

• ABS (American Bureau of Shipping)

• BV (Bureau Veritas)

• CCS (China Classification Society)

• DNV (Det Norske Veritas)

• GL (Germanischer Lloyd) – now part of DNV

• LR (Lloyd’s Register)

• NK (Nippon Kaiji Kyokai / ClassNK)

• KR (Korean Register)

• RMRS (Russian Maritime Register of Shipping)

• RINA (Registro Italiano Navale)
  Please specify your required certification when ordering.

6. Is this system suitable for a 40-foot yacht with 6-8 people?
While the SWCM(I)-20 is rated for 20 persons, it would be oversized (and physically too large) for a typical 40-foot yacht with 6-8 people. This model is designed for vessels with a crew/passenger capacity around 20 persons. For a smaller yacht, we would recommend a smaller model from our SWCM series, such as the SWCM(I)-10 or SWCM(I)-15, which offer the same advanced technology in a more compact footprint. Please contact us for assistance in selecting the correct size.

Attention please: The description was copied from different cooperating manufacturers. The description may be different with the goods, please check with us when order.

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