PureBilge Technical information for bilge water treatment

The PureBilge system from Alfa Laval is a reliable fully automated, single-stage centrifugal separation system to clean oily wastewater onboard vessels at sea and at land-based power plants. 3 Summary 4 The Alfa Laval PureBilge system Overview System benefits Technical data Dimensions 6 Towards cleaner oceans What is bilge water? Bilge water legislation 8 Stable emulsions in bilge water What are emulsions and suspensions? Chemical usage aids stabilization Effect on separation performance Mechanisms for emulsion breakdown 10 Equipment Capacities Operating principle Components in the system 13...

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Alfa Laval PureBilge Summary Bilge water must be treated to reduce the oil content to levels that meet i nter ational regulations for release into the environment. This is critical to keep n the world’s oceans and their vast marine ecosystems healthy and productive. The Alfa Laval PureBilge system is a centrifugal separation system for bilge water treatment that is approved by the International Maritime Organization (IMO) and the U.S. Coast Guard. This system is able to reduce the oil-in-water content of bilge water to less than 5 parts per million (ppm). It operates at flow rates of up to 5...

Alfa Laval PureBilge The Alfa Laval PureBilge system Cleaning of bilge water poses distinct challenges. Not only does the composition and flow of bilge water constantly change, making continuous and efficient treatment difficult, but treatment onboard also presents another set of constraints. Alfa Laval PureBilge Treatment methods must meet individual ship requirements and demands for safety, reliability, compactness, utomation, a low maintenance and the ability to withstand rough weather conditions. In addition, performance of the treatment ystem s can vary depending on the oil content and the...

Alfa Laval PureBilge PureBilge is easy to install. It does not require large bilge water holding tanks, which increases payload capacity. Compared to conventional bilge water systems, PureBilge significantly reduces operating costs because no chemicals or filters are required and maintenance requirements are low. PureBilge enables cleaning of bilge water under a wide range of real operating conditions. It is certified according to the Marine Environment Protection Committee Resolution, MEPC 107(49), of the International Maritime Organization (IMO), MED 96/98/EC and USCG document 46 CFR 106.050....

Alfa Laval PureBilge Towards cleaner oceans Bilge water generated onboard ships is a major environmental concern for the shipping industry. Regardless of its source, bilge water must be treated to reduce the oil content to levels that meet international regulations for release into the environment. This is critical to keeping the world’s oceans and their vast marine ecosystems healthy and productive. What is bilge water? Bilge water collects in a ship’s bilge wells, which are located in the lowermost part of the vessel just above the hull. The wells receive water and mechanical fluids from operational...

Alfa Laval PureBilge Bilge water composition. Fresh water Seawater Heavy fuel oil Lube oil Hydraulic oil foresee. The first category includes water from the separator sludge tank and water from cleaning activities in the ship’s engine room. The second category may include soot water, leakage and incident spills from tanks and machinery spaces. Bilge water is thus composed of a mixture of water, detergents and other chemicals, fuel oil, lubricating oil, hydraulic oil, cat fines, oil additives, soot and dirt. This mixture is collected in the bilge water holding tank, which generally is maintained...

Alfa Laval PureBilge Stable emulsions in bilge water Separation of oil and particles from bilge water is becoming increasingly c hallenging, due to the presence of stable emulsions and suspensions. Emulsion and suspension formation and stability are of major concern in the context of bilge water treatment. What are emulsions and suspensions? By definition, an emulsion is a mixture of two immiscible liquids An oil-in-water emulsion consists of small oil droplets . dispersed in a continuous water phase. A suspension is a mixture in which solid particles are dispersed in the con tinuous water phase....

Alfa Laval PureBilge High centrifugal force in the s eparator ontributes c to oalescence and c flocculation, which aid emulsion breakdown. Mechanisms for emulsion breakdown There are different mechanisms for emulsion destabilization and breakdown, including coalescence and flocculation. • Coalescence is a process where two or more droplets collide resulting in the formation of one larger droplet. , The patented Alfa Laval XLrator g ently ccelerates bilge water into a the separator bowl with minimal shearing and foaming. This greatly improves separation fficiency e by preventing the splitting...

Alfa Laval PureBilge Equipment Environmental protection requires reliability. This is how Alfa Laval has met the bilge water treatment challenge. Capacities PureBilge is available in two standard versions: PureBilge 2515: 2 500 l/h, 15 ppm PureBilge 5015: 5 000 l/h, 15 ppm Operating principle A feed pump with variable frequency drive control directs oily water from the bilge water settling tank or equivalent to the system. Bilge water then passes through a strainer which traps large particles from the fluid before entering a heat exchanger, which raises the fluid temperature to required levels,...

Alfa Laval PureBilge The disc-stack design provides the maximum surface area possible for separation. Specially designed concentrator d istribution holes and caulk configuration further optimize separation efficiency. A speed sensor and an optional vibration sensor monitor the mechani al status of the separator. c Oil-in-water monitor The in-line unit monitors the oil content of separated bilge water in compliance with IMO Resolution MEPC 107(49). It is capable of monitoring oil content from zero to 40 ppm at sample temperatures of up to 70°C. To minimize response time, the isokinetic sampling...