SUPPORTING EFFICIENCY.SINCE 1868

Wilhelm Rump KG (GmbH & Co.)Witternstrasse 2021107 HamburgGermany

+49 40 31 78 420+49 40 31 94 841info@rump-kg.dewww.rump-kg.de

Brief Function, Operation & Maintenance Instruction

SERVICE FOR WÄRTSILÄ HAMWORTHY

Sewage Treatment Unit Type ST-A

According to MEPC.2(VI)

GENERAL FUNCTION/01

1 Raw sewage inlets

2 Visual indication pipe for activated sludge return

3 Screen

4 Vent

5 Skimmer to remove �oating debris

6 Control panel

7 Chlorinator for continuous chlorination of ef�uent

8 Waste water inlet

9 Emergency over�ow

10 Aeration compressors

11 Float switches

12 Filling connection

13 Discharge pump

14 Settling tank

15 Aeration tank

16 Air diffuser assemblies

In principle, the Super Trident Sewage Treatment unit comprises a tank, divided into three water tight compartments - an aeration compartment, a settling compartment, and a chlorine contact compartment.

The incoming sewage enters the aeration compartment, where it is digested by aerobic bacteria and micro organisms which are promoted in the sewage itself by the addition of atmospheric oxygen. From the aeration compartment the sewage �ows into the settling compartment where the aerobic bacteria �oc, known as activated sludge, is settled out producing a clear ef�uent which passes through a chlorinator and into the chlorine contact compartment before being �nally discharged.

GENERAL FUNCTION OPERATIONS/02

A complete description of PREPARATION OF UNIT FOR INITIAL OPERATION can be found in the instruction manual under section 4.2.

2.1 WATER - SYSTEMDuring normal operation valves 3 and 6 have to be opened. Grey Water Waste Drains: Discharge directly overboard in accordance with I.M.O. Regulations. A limited quantity of grey water meeting I.M.O. sewage ef�uent standards from sources below the water line may be piped into the disinfection tank (no galley sinks, garbage disposal units or laundry). NOTE: Sink waste, etc., should pass through a de-greasing unit and solids should not be present.

The valves No. 1 & 2 control the air �ow to the internal air diffusers. These valves have to be completely open.

The valve No. 3 controls the air �ow to the internal skimmer and has to be open app. 1/3 to give a minimum reliable liquid �ow through the visual indicator pipe A. Skimmer air lift can empty the skimmer. Adjust valve No. 3 only when water is in skimmer tray, i.e. when being fed.

The valve No. 4 controls the air �ow to the internal sludge return and has to be open app. 1/3 to give a minimum liquid �ow through the visual indicator pipe B. Please see detailed instruction on the Instruc-tion Manual Section 4 OPERATION, page 4-3. This permanent sludge return has to be checked.

During normal operation:

2.2 AIR - SYSTEM

2 3 4 B A1

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•

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OPERATIONS MAINTENANCE/03

You can �nd the complete maintenance instruction in the manual

under section 5 - maintenance.

3.1 DAILYCheck the air supply pressure gauge reading and that activated sludge is being returned through the transparent pipes on top of the tank. The cock valve should be carefully adjusted to give the required �ow (see above under 2.2 Air System).

3.2 WEEKLYWhen in restricted areas replenish the supply of tablets in the Chlorina-tor. Check the chlorine content of the ef�uent (See manual section 4 - Determination of Residual Chlorine Content). Cleaning of the Grease Trap. Coarse screen �lter to be inspected and any plastic bags or other debris etc. to be removed. Access to screen is obtained through inspection cover.

3.3 MONTHLYCheck the content of sludge in the aeration compartment for quantity of suspended solids using the graduated cylinder supplied. Sample point detailed in the manual, drawing D7936. Fill the cylinder to 100 ml level and allow to stand for 30 minutes. If the level of the settled sludge is above the 60 ml level, the unit must be partially desludged as descri-bed in the manual, when not in restricted areas or to a shore facility.

3.4 EVERY 6 MONTHSFilter cartridges �tted to the aeration compressor need to be replaced. Check the functioning of the non-return valve �tted to the air line, if necessary.

3.5 ANNUALLYDrain and clean all compartments of the unit and inspect and repair any damaged coating. Inspect the discharge pumps and air blowers for wear. Replace aerator air diffuser elements.

NOTE: If air pressure rises more than 0.2 bar (3 lbf/in2) above original commissioning pressure at any time, check both �lter cartridges and aerators and replace if necessary.

THIS INFORMATION IS ONLY AN ADDITION TO THE ORIGINAL INSTRUCTION MANUAL OF THE UNIT!We provide service and spare parts for all Wärtsilä Hamworthy sewage treatment plants.

WILHELM RUMP KGMarine Services

As an agent of Hamworthy since 1948 we have acquired not only specialized knowledge but can also provide our customers with all relevant information from the manufacturer.

Due to the increasing importance of the Sewage Treatment Unit, specialized service and crew training can be helpful for the well-functioning of your Sewage Treatment Unit.

However, the unit can be operated without any problems by a knowledgeable and trained crew. Therefore we advise two hours of training to new crew members in order to assure a safe operation of the Sewage Treatment Unit.

If any Service, Spare Parts or Crew Training is required, please contact our relevant department:

SERVICES & CREW TRAINING Tel: +49 40 31 78 4221E-mail: service@rump-kg.de

SPARE PARTSTel: +49 40 31 78 420E-mail: spares@rump-kg.de

SERVICE/04

Wilhelm Rump KG (GmbH & Co.)Witternstrasse 2021107 HamburgGermany

Phone:Fax: e-mail: Web:

+49 40 31 78 420+49 40 31 94 841info@rump-kg.dewww.rump-kg.de

Our main working languages are German, English and Russian but the team can also handle business in Spanish, Portuguese and Arabic.

The Wilhelm Rump KG works under a quality management system which is certi�ed according to EN ISO 9001:2008 of the DNV GL.

Our company is a member of numerous professional associations, in particular: „German Ship Suppliers Association“ and the „International Ship Suppliers Association (ISSA)“

We fully support the activities and goals of these associations.

WILHELM RUMP KGMarine Services

THIS INFORMATION IS ONLY AN ADDITION TO THE ORIGINAL INSTRUCTION MANUAL OF THE UNIT!

SERVICE