Biological Sewage Treatment System

IMO has adopted RESOLUTION MEPC.227(64) with revised guidelines for effluent standards and performance test procedures for sewage treatment plants.
 
These guidelines, adopted in October 2012, which supersede resolution MEPC.159(55), include the standards of section 4.2 that specifically apply to passenger ships operating in MARPOL Annex IV special areas and which intend to discharge treated sewage effluent into the sea.
 
The ACO Clarimar MF® range of sewage treatment plants are fully certified by Bureau Veritas (BV) to IMO MEPC.227(64) [excluding §4.2].
 
Manufacturing, Test and Quality Management are certified to ISO 9001:2009 / ISO 9001:2008 and EC MED Module D.

ACO Clarimar MF – ACO-MF ‘Bio-Sword’ Filtration Technology

The ACO Clarimar MF biological sewage treatment plant incorporates ACO-MF filtration technology eliminating the requirement for settling and chlorination stages. Disinfection of the treated effluent is by in-line mounted UV lamp with no requirement for chemicals in any part of the ACO MF process.

The unique properties of the ACO ‘bio-sword’ allow operation with bio-mass concentrations in the activation chamber up to four times higher than those of conventional settling type sewage treatment plants. By operating at such high concentrations, a greatly reduced activation tank volume is achieved with a significant reduction in both the footprint and maintenance envelope requirement.

  • Type Approved to IMO MEPC 159(55) and MED Module B
  • Type Approved to IMO MEPC 227(64) and EC MED Module ‘B’
  • Life–time corrosion guarantee² on tank material
  • Compatible with both gravity and vacuum systems
  • Self-cleaning ‘Bio-Sword’ with ACO-MF filtration technology dramatically exceeds all IMO requirements
  • Manufactured entirely in the EU from high performance materials which, unlike coated black steel, are completely corrosion resistant and light weight
  • Modular design concept for simple installation requiring only one power connection
  • Lowest running costs of any sewage treatment plant on the market with minimal operator intervention
  • Unaffected by ship movement or vibration

Process Description

Sewage and waste water enters into the main activation stage where it is thoroughly mixed and aerated by fine bubble aeration membrane elements. Mounted blower(s) (an optional standby unit is available) provide air to the aeration elements whose innovative design allows quick and easy removal for cleaning. Aerobic bacteria and micro-organisms, naturally present within the waste material, break down the organic matter into mostly carbon dioxide, water and inert non-organic material. Throughout the process the bacteria cells continue to reproduce new organisms to sustain the biological process.

Clean water from the mixed liquor in the activation chamber is drawn through the ACO-MF ‘bio-sword’ by the effluent discharge pump (an optional standby unit is available) and discharged either directly overboard or alternatively to be recycled back into ship’s storage for re-use as technical fresh water for all non-potable requirements such as toilet flushing, deck washing or even laundry applications.

A separate Discharge & Maintenance Pump (DMP) provides the higher capacity de-sludge and emptying requirement.
Treated effluent water is colourless and odourless. Discharge is controlled by level control connected to the effluent discharge pump.

Provided only standard sewage water enters the unit without any chemical shock or overload, that the unit is operated and maintained in accordance with the IO&M manual provided and that only OEM spares and replacement parts are used.

  USCG

33CFR159

IMO MEPC.2(VI) IMOMEPC

227(64)

ACO Clarimar MF test values
Coliform bacteria [n/100ml] 200 200 100 25
Total suspended solids[mg/l] 150 100 35 <14
BOD5[mg/l] 50 25 <3
COD[mg/l] 125 <25
pH Not req’d Not req’d 6 – 8.5 7.44
Chlorine (mg/l) Not req’d As low as practicable <0.5 NIL

 

Clarimar MF technical description

The main tank is manufactured entirely within the EU from high performance ‘ACO Composite PPFR GREY’ material which, unlike coated black steel, is light weight and completely resistant to corrosion, abrasion and chemical attack. Available as standard in grey colour.

The tank is supplied as a complete welded construction directly mounted on to a primer painted steel baseplate (sizes MF-6 and above) for direct welding or bolting to the ship structure. Smaller units up to size MF-4 have no baseplate and mount direct by bolting (using pre-drilled holes in the extended tank base) to the ship’s structure.
Where fitted, the baseplate includes openings for manipulation with fork lift. Lifting eyes are positioned at each tank upper corner for manipulation by crane.

All other components are also mounted on the base frame providing a complete ‘plug & play’ installation solution. All Clarimar MF installed components are designed to operate, as standard, in the voltage range 380 to 440 volts and at frequencies of either 50 or 60 Hz, without any additional modification. Additional voltage options are also available

Control of the system is via an IP55 rated steel cabinet complete with safety isolator and volt-free contacts for connection to the ship’s central monitoring and alarm system.

Clarimar MF  Hydraulic Load [Lits/Day] BOD5 Load [kg/day] Number PE**[Black & Grey Water] Overall Dimensions (mm) Weight (kg)
HYD BOD L W H Dry Wet
Clarimar MF-0,5 1 200 0,77 7 11 1 445 1 130 1 607 330 1 025
Clarimar MF-1 2 100 1,31 12 19 1 658 1 315 1 686 430 1 640
Clarimar MF-2 3 500 2,41 20 34 1 958 1 405 1 746 512 2 760
Clarimar MF-3 5 600 3,61 32 52 2 190 1 645 1 750 610 3 830
Clarimar MF-4 7 200 4,59 41 66 2 400 1 901 1 743 640 4 870
Clarimar MF-6 11 200 7,22 64 103 2 786 2 201 2 070 1 200 7 830
Clarimar MF-8 14 200 9,10 81 130 3 070 2 351 2 077 1 400 9 670
Clarimar MF-10 18 900 12,14 108 173 3 820 2 351 2 077 1 590 12 610
Clarimar MF-12* 22 400 14,44 128 206 2 805 4 893 2 070 2 250 15 512
Clarimar MF-16* 28 300 18,16 162 259 3 111 5 193 2 077 2 500 19 046
Clarimar MF-20* 37 800 24,28 216 347 3 855 5 193 2 077 3 000 25 062

 

* To minimise transport costs MF-12, 16 & 20 are delivered as two separate tanks to be bolted together during installation

** Indicative only – to be confirmed during specification review; based on 25 lit black and 150 lit grey water per person

Size range