Coursework Ship Ballast Water Management

Table of Contents

Table of Contents………………………………………………………1

1. Introduction………………………………………………………..1

1.1 Reasons of introducing ballast water management on board………………………1

1.2 BWM standard requirements…………………………………………..1

2. IMO approved BWM systems……………………………………………..2

2.1 Ecochlor BWTS……………………………………………………2

2.1.1 Working Principle……………………………………………….2

2.1.2 Process Description………………………………………………2

2.1.3 System specifications……………………………………………..2

2.1.4 System advantages and disadvantages………………………………….2

2.2 Alfa Laval PureBallast………………………………………………..3

2.2.1 Working Principle……………………………………………….3

2.2.2 Process description………………………………………………3

2.2.3 System specification……………………………………………..3

2.2.4 System advantages and disadvantages………………………………….4

3.Suitability on ships…………………………………………………….4

Reference……………………………………………………………5

Appendix……………………………………………………………6

1. Introduction

1.1 Reasons of introducing ballast water management on board

The introduction of steel-hulled vessels, lead to the use of water ballast system where water is pumped in to the vessel to decrease the stresses occurring on the hull, while providing transverse stability and improving propulsion and maneuverability [3]. It also, compensates for weight shifts in different cargo load level operation, thus water ballast ensures the safe and efficient operation of the vessel. However, due to the fact, that marine species, i.e. bacteria, microbes, small invertebrates, eggs, cysts and large various species are getting pumped during the filling process of water ballast [3]. Consequently, creating several problems, such as ecological, health and economic ones.

1.2 BWM standard requirements

IMO has implemented the following two BWM standards D-1, D-2. D-1 standard requires ship to discharge their ballast water in deep water (200 meters deep) and at distance 200 nautical miles away from land, by doing that it decreases the chances of organisms surviving in the deep-sea water environment. D-2 standard relates to the size of discharged organism, as follows [3]:

• Less than