Evac wastewater pre-treatment
Removal of harmful solids and liquids

Before black and gray water enters the wastewater treatment plant, it needs to be pre-treated in order to remove harmful solids and liquids. We offer several pre-treatment units including grease separators and screening units for solids.

Evac grease separators

The Evac grease separators, Evac EcoTrap and Evac SGT, separate grease from galley wastewater in marine and offshore applications. Gray water from food preparation areas on board vessels typically contains significant amounts of grease, which is harmful to piping, valves, tanks, pumps, and other components of sewage and wastewater treatment systems. Grease can cause deposits, pipe clogging, and unpleasant odors, and removing it requires inconvenient and expensive cleaning. Grease can be separated from water with a grease separator. If gravity drainage is an issue, a vacuum grease separator can be used.

The Evac grease separator range includes both manually operated and automatic models. In the manual models grease is discharged via a manhole. Our automatic grease separators are equipped with a discharge pump and one or more heating elements. The collected grease and sludge is discharged by the pump, which can be started manually or automatically.

Our Evac grease separator range consists of three product families:

  • Standard grease separators that fulfill the requirements of the DIN 4040-1 standard, with some marine modifications
  • Grease separator systems
  • Grease separators for vacuum systems

 

Benefits

  • Manual or automatic operation
  • Low maintenance
  • DIN 4041-1 and EN 1825-1/2 compliant
  • Competitively priced
  • Odor-free
  • No gravity drainage needed

Evac EcoTrap

 

Evac grease separator

 

Evac EcoScreen

The Evac EcoScreen is a mechanical sewage pre-treatment plant. It is a complete standalone screening unit, which can be installed in connection with a sewage treatment plant. A screening unit is recommended for the sewage pre-treatment phase in systems using a custom-designed Evac MBR (membrane bioreactor) to clean wastewater.

The Evac EcoScreen unit mechanically separates most of the solid matter from the wastewater. Separating solids before the MBR is strongly recommended because solid matter may cause problems in the MBR unit. Separating solids also diminishes the organic load in the sewage by approximately 10–20%. If a screening unit is used, a macerator is not needed to chop the solid matter.

Before black and gray water enters the wastewater treatment plant, it needs to be pre-treated in order to remove harmful solids and liquids. We offer several pre-treatment units including grease separators and screening units for solids.

Evac grease separator

The Evac grease separators, Evac EcoTrap and Evac SGT, separate grease from galley wastewater in marine and offshore applications. Gray water from food preparation areas on board vessels typically contains significant amounts of grease, which is harmful to piping, valves, tanks, pumps, and other components of sewage and wastewater treatment systems. Grease can cause deposits, pipe clogging, and unpleasant odors, and removing it requires inconvenient and expensive cleaning. Grease can be separated from water with a grease separator. If gravity drainage is an issue, a vacuum grease separator can be used.

The Evac grease separator range includes both manually operated and automatic models. In the manual models grease is discharged via a manhole. Our automatic grease separators are equipped with a discharge pump and one or more heating elements. The collected grease and sludge is discharged by the pump, which can be started manually or automatically.

Our Evac grease separator range consists of three product families:

  • Standard grease separators that fulfill the requirements of the DIN 4040-1 standard, with some marine modifications
  • Grease separator systems
  • Grease separators for vacuum systems

Benefits

  • Manual or automatic operation
  • Low maintenance
  • DIN 4041-1 and EN 1825-1/2 compliant
  • Competitively priced
  • Odor-free
  • No gravity drainage needed

Evac EcoTrap

Evac grease separator

Evac EcoScreen

The Evac EcoScreen is a mechanical sewage pre-treatment plant. It is a complete standalone screening unit, which can be installed in connection with a sewage treatment plant. A screening unit is recommended for the sewage pre-treatment phase in systems using a custom-designed Evac MBR (membrane bioreactor) to clean wastewater.

The Evac EcoScreen unit mechanically separates most of the solid matter from the wastewater. Separating solids before the MBR is strongly recommended because solid matter may cause problems in the MBR unit. Separating solids also diminishes the organic load in the sewage by approximately 10–20%. If a screening unit is used, a macerator is not needed to chop the solid matter.

We recommend equipping food preparation areas like kitchens with a grease separator. In some cases it is mandatory. When wastewater containing fat, oil, and grease comes into contact with cold sewage, grease solidifies and builds up inside the pipes. Significant quantities of grease in a sewage system can clog pipes and generate unpleasant odors, resulting in inconvenient and expensive cleaning as well as disruption to sewage treatment facilities.

The grease separator is installed in a vacuum network and operated under vacuum conditions. Gray water is directed to the grease separator tank, where grease and water are separated by gravity. Fat, oil, and grease are trapped at the top of the tank, where they form a crust. The water in the lower part of the tank is sucked into the vacuum network via the outlet. Once the tank has reached capacity, the discharge process is initiated. The process includes circulation of wastewater from the bottom to the top of the tank, cleaning with the rotating wash head and clean water. Once the crust has been broken down, the valves can be switched so that the pump is in discharge mode. Once the low-level switch is reached, the discharge pump stops automatically. Before the grease separator restarts, the tank is filled with water until the high-level switch is reached.

Evac NS3-NS5 vacuum grease separators

Evac NS3-NS5 commercial vacuum grease separators are specially designed for the European market. The design and correct model selection are carried out according to European standards EN1825-1 and EN1825-2.

The separator is composed of:

  • Collection and grease separation tank with a capacity of 1,200 or 2,000 liters/317 or 528 gallons (higher capacities available on request)
  • Circulation and discharge pump
  • Rotating wash head in the upper part of the tank
  • High-level switch for the tank-filling process
  • Low-level switch to stop the discharge pump
  • Inlet connections to the PVC vacuum network pipes
  • Outlet connection
  • DN50 discharge connection for the sludge and grease outlet
  • Control panel for power, level, and discharge management

Evac NS3

Benefits

  • Low maintenance
  • EN 1825-1/2 compliant
  • Odor-free
  • No gravity drainage needed

Evac NS7 and NS10

Evac NS7-NS10 vacuum grease separators

Evac NS7-NS10 commercial vacuum grease separators are specially designed for the Asian market.

The separator is composed of:

  • Collection and grease separation tank with a capacity of 1,500 or 2,000 litres (higher capacities available on request)
  • Sludge discharge pump
  • Grease level sensor (optional)
  • DN150 connections to the PVC network pipes for gray water inlet and outlet, DN32 to DN40 for sludge, and 1–3 DN50 grease outlet(s)

Benefits

  • Low maintenance
  • Odor-free
  • No gravity drainage needed
  • Designed according to EN 1825-1/2 European standard
  • Typically removes around 90% of grease from wastewater

Operating principle of Evac grease separator

The grease separator is installed in a vacuum network and operated under vacuum condition. Gray water is directed through the inlet to the grease separator tank, where grease and water are separated by gravity according to their density. Fat, oil and grease are trapped at the top of the tank and constitute eventually a crust. The separated water is taken in the lower end of the tank to the outlet and sucked into the vacuum network. After a while the tank has reached its sludge and grease storage capacity and the tank discharge is needed. The discharge alarm is set on a timer. The discharge process includes circulation of wastewater from the bottom to the top of the tank, cleaning with the rotating wash head and tap water, and once the crust is broken down the valves can be turned so that the pump is in discharge mode to the truck. When the low level is reach the discharge pump is automatically stopped. Before restarting the grease separator after a discharge, the tank is filled with water until the high level switch is reached.

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