The Alfa Laval Phoenix treatment system for contaminated water is an extremely versatile, modular process solution whose elements can be combined to meet many different needs.
How it works
Clean water in three steps
The Phoenix system features three separate modules, each designed to remove specific contaminants from the water drains on board a drilling rig in order to tackle the different separation requirements.
Each module can be used to prepare these flows for subsequent treatment. They can also be combined as required to meet many different processing requirements, as well as space constraints and other practical considerations on board. The modules therefore provide a high degree of versatility, enabling you to cope effectively with varying future needs, at virtually no extra cost.
An Alfa Laval decanter centrifuge deals with the initial stage in the treatment process, focusing on solids removal. This module tackles flows of contaminated water where a lot of the volume consists of particles up to 5 mm in diameter – even if these particles are coarse and abrasive.
In many cases, fine particles and droplets encapsulated in water will pass through the initial solids removal process. A screening stage is therefore used for secondary solids removal. Chemical dosing is used to increase the efficiency of this second stage, especially for emulsions.
The disc stack centrifuge module consists of an Alfa Laval disc stack centrifuge acting as a polisher, removing with high efficiency oil droplets and particles, even down to small sizes.
The three different modules can be mounted together on one single skid or on separate skids if space dictates. In some cases, a single disc stack centrifuge will suffice – in others, a multi-stage system may be necessary.
This equipment can be placed in hazardous as well as in safe areas.
New solution to old problems
Offshore rigs and production platforms – as well as other installations and vessels used in the oil and gas industry – operate with complex mixtures of oil, water and solids, often in large volumes. Most conventional technologies are incapable of effectively splitting the kinds of stable emulsions often found in mud contaminated oily waste water, or of removing suspended colloidal particles.
Variations in waste streams
These complex streams of contaminated water vary considerably in composition and physical properties. However on a drilling rig, they almost always contain both hydrocarbon residues and solid particles – ranging from coarse to extremely fine. These mixtures are often in the form of complex emulsions that are difficult for traditional separation systems to tackle.