Oily water separators & waste water treatment Detegasa


Oily water separators The DELTA Bilge water Separator, from industry specialists DETEGASA is designed to process oily water stored in the ship’s bilge, creating a clean effluent containing less than 15 ppm of hydrocarbons. This level of hydrocarbons is the acceptable level according to IMO Resolution MEPC 107(49). The separator unit is compact and can be controlled automatically. The system works by separating the free hydrocarbons on the gravity separator and if there is emulsion, adsorbing it into the adsorption tank arranged adjacent. The first treatment phase is the DELTA OWS gravity static separator, which uses an inner coalescer filter. This is followed by an adsorption process. In most occasions the readings after the first phase are below 15ppm, allowing the discharge overboard without having to go through the second phase. As a result, the adsorption filters have a longer life span. Discharge at first phase is automatically checked by two level sensors.

  • Wide Range of Capacities
  • Compact Design
  • From 500L to 5,000L per hour
  • Easy Installation
  • Fully Automatic Operation
  • Reliable Performance
  • Low Maintenance Requirements
  • Type Approved to IMO Resolution MECP 107(49)

Advanced hydrocarbon separation systems combined with interactive monitoring and alarm devices are helping shipowners to meet the most stringent bilge water regulations. The marine industry is increasingly aware of the danger caused by pollution from vessels, both in terms of emissions and harmful waste deposits. In an eagerness to protect the environment and, where possible, recover marine ecosystems, there are increasingly stringent international regulations to which crews have to adhere to. Bilge water is an almost unavoidable product in ship operations. Bilge water that is generated in proximity to shipboard equipment (such as in the engine room) often contains oil and its direct discharge would result in undesirable transfer of waste oil to the marine environment. By international agreement under the MARPOL convention, most commercial vessels need to be fitted with an oily water separator to remove oil contaminants before bilge water is pumped overboard. Oily water separator equipment has been a shipboard requirement since the 1970s but recently it has become evident that oily water separators have not been as effective as had been assumed, and alleged improper operation of this equipment by crewmembers (sometimes called the magic pipe) has resulted in criminal prosecutions in the United States and to a lesser extent in Europe. Taking better care of the marine environment is possible as a result of the new technologies and improvements to the equipment used to treat marine waste. In order to meet to international regulations, shipowners must employ reliable and accurate means of monitoring their bilge water.

Waste water treatment Detegasa offers complete waste water treatment solutions which fully comply with latest Marpol IMO MEPC.159 (55), European Maritime Equipment Council and USCG regulations for vessels above 400GRT or carrying more than 15 persons. Detegasa waste water treatment models can handle between 700L and 10,000L per day (suitable for 10 to 140 persons per plant). The Delta PRB Sewage treatment plant satisfactorily fulfils the following characteristics:

  • Is an aerobic type system, therefore without any risk of Methane production.
  • Can perform satisfactorily with waste collected either by gravity or vacuum.
  • It is a fully automatic system designed for low maintenance.

The plant is made up by the following tanks:

  • Collecting and aeration tank.
  • Settling tank.
  • Disinfection tank.

The sewage water enters the unit through the raw sewage inlet at the top of the aeration tank. Oxygen is continuously supplied to this tank, to stimulate the bacteriae growth and therefore the biological action.