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Separators are devices designed to separate and retain petroleum derivatives as well as suspended minerals (sand, sludge) that rainwater and meltwater flowing from any kind of watershed may contain.  

APPLICATION, DEPENDING ON SEPARATION TECHNOLOGY USED

It is important to choose the appropriate separation technology for petroleum derivatives depending on watershed type and device working conditions. When choosing the appropriate technology it is important to take the following aspects into consideration:
  • watershed size
  • protection of the device against potential storm flow
  • the amount of suspended solids in wastewater
  • separator's sensitivity (protection zone, prohibited areas, etc.)
 

Design

Separators have watertight concrete body (chambers of Ø1000–3000 or a separated reservoir chamber) usually does not need extra load. Depending on the separator's location cast iron or cast iron and concrete manholes classes A15, B125, C250 and D400 are used. In order to adjust the location of the separator slab to ground elevation there is an additional top element used made of concrete rings corresponding to the diameter of the separator's body. When the sewer system is located deep in the ground, a reduction-slab and a chimney made of ID 1000 rings can be used. The inlet and outlet are located in the axis of the separator. It is also possible to deviate inlet and outlet axes (consult the catalogue for details) as well as connect several inlets. A separator placed in a concrete tank with foundation on bearing soils up to 10 m below ground level does not need special foundation and does not need static calculations. Normally, excavation death is prepared using minimum 10 cm C8/10 (B10) concrete substructure or well-compacted layer of gravel or other course non-cohesive soil. Separators should have gravitation inflow. In case of need for wastewater pumping it is recommended that the pumping station is located after the separator. A separator must be located in a place providing access for a suction vehicle. A separator's body can also be made of PE-HD plastic (consult catalogue pages on separators for details). In order to reduce maintenance costs and improve ecological safety there is a possibility to connect a separator to alarm systems such as sediment level sensors, oil and overflow sensors. Regular monitoring of the device limits the necessity to physically control the device and shortens the reaction time of maintenance teams in case of a failure.  

OPERATION

In high-performance coalescence separators the separation of petroleum derivatives takes place due to the phenomenon of gravitational separation of oil and water, which is enhanced by the phenomenon of coalescence. Mineral solids suspended in wastewater settle in the process of sedimentation and filtration in coalescent material. The construction of the separator slows down wastewater flow and at the same time forces its separation into wastewater stream with petroleum derivatives (stored in the separator) and water. Petroleum derivatives lighter than water come onto the surface where they accumulate forming a layer. Small droplets of mineral oil, which do not have sufficient buoyancy, form bigger drops when flowing through coalescent material (coalescence process) what makes their gravitational separation easy. Submerged outlet stops separated impurities from getting into the receiver.

eskESK coalescent separator

 

ESK COALESCENCE SEPARATORS VERSIONS

Due to vast application of coalescence separators there are different versions available suited to individual needs resulting from installation conditions:
  • ESK high-performance coalescence separator
  • ESK-B high-performance coalescence separator with by-pass
  • ESK-E high-performance coalescence separator with inflow closure.
The standard equipment of the device is a coalescence separation column together with wastewater outflow closure installation that activates when the limit of oil stored in the separator is reached. The task of a float valve at the outflow is to stop any accumulated petroleum derivatives from being flushed out into the outflow. All design elements are characterised by high chemical resistance and mechanical durability. Inflow and outflow pipes inside an ESK-E separator are made of stainless steel (the device dedicated for energy industry).  

ESK-B Coalescence Separators with by-pass

High-performance coalescence with internal hydraulic by-pass (by-pass) are equipped in a precise wastewater flow system, which constantly regulates its inflow into the device. The system provides optimal operation of coalescence section (maximum treatment efficiency). Ecol-Unicon by-pass system is protected under patent application No. P393813.

esk_bESK-B by-pass coalescent separator

  Rainwater containing impurities enters through the inlet pipe and then goes downward through a vertical inlet inside the separator. The overflow edge inside the by-pass pipe directs excessive nominal flow into the separator. Additionally, the amount of wastewater flowing into the separator is controlled by an integrated float valve. The inflow that exceeds nominal flow is not treated but due to inlet closing by the float valve is directed into the by-pass pipe.  

ESK-E Coalescence Separators with Inflow Closure

ESK-E high-performance coalescence separators have the inside made of stainless steel meeting the requirements of industry and energy industry because of their high temperature and chemical resistance. Inflow closure mechanism, which closes the inflow in the event of impoundage of wastewater inside the device, is its standard feature. Impoundage may occur in the event of exceeding the limit of oil storage capacity, too high wastewater inflow or outflow closure.

esk-e

ESK-E coalescence separator with inflow closure

 

Suspended Solids Separation – Cooperation of Coalescent Separators with a Settling Tank

Wastewater with suspended solids should be pretreated in a settling tank. A correctly designed settling tank should provide optimal treatment efficiency and sufficient storage capacity for suspended solids. A settling tank can be a standalone device (Settling Tanks) or can be integrated with a coalescence separator where the settling tank is placed below the coalescence column – typically marked H (e.g. ESK-H, ESK-BH etc.). The purpose of such integrated system is to reduce the size of treatment installation, while providing high degree of treatment of petroleum derivatives and suspended solids. It is used mainly in highly urbanised areas. Optionally, this device can be fitted with an alarm system (Monitoring System) or linked up to Bumerang, an intelligent rainwater management system.  

esk-h

Coalescent separator with ESK-H settling tank

os-esk

OS horizontal settling tank cooperating with ESK coalescence separator

 

Coalescence Separators in Overflow Systems with Regulators

Using regulators enables efficient protection of rainwater pretreatment facilities against their overload resulting from torrential rain inflows. Overflow systems designed by Ecol-Unicon are chosen individually and consist of:
  • distribution chambers with a flow regulator adjusted to pretreatment devices throughput;
  • a connecting chamber;
  • external overflow of a diameter and gradient adjusted to accept maximum rainwater inflows.
In case of pretreatment systems before which a distribution chamber with a flow regulator and a by-pass pipe are installed it is important that the chamber is able to distribute the wastewater properly. Nominal flow from the watershed (Qnom) should be treated completely while in case of the maximum flow from the watershed (Qmax), the separator should be protected against hydraulic overload. An appropriately chosen flow regulator ensures that Qreg = Qnom at two points A and B. The height of the bottom of a by-pass pipe (or the location of the top of overflow edge) should be at elevation of HHA, which ensures that the flow directed into pretreatment system is Qreg. With wastewater inflow, impoundage level rises to H = HB and the flow lower than Qreg, is directed thought the regulator, which protects the device against hydraulic overload. The flow higher than Qreg is directed into the by-pass pipeline.    
Oil separators are installed in rainwater drainage systems as one of the devices used in pretreatment of rainwater from watersheds that are likely to be polluted by petroleum derivatives – urban, road and facility. They are most often used at:
  • roads and motorways,
  • car parks,
  • railroad areas,
  • public transport areas,
  • transportation equipments depots,
  • production plants, etc.

ESK

ESK-B II

ESK-BH II

ESK-E

ESK-EH

ESK-H