Sand/grease trap

1 Compact pretreatment unit

EKOflow COMP

Standard sizes:

Application:

• Unit is predicted for the purpose of separating particles in a mechanical pretreatment.
• By selection of the appropriate unite, effective separation of the fine impurities from the waste water is enabled, after which thus impurities are extracted into the waste containers,.
• Standard device is dimensioned to extract at least 90% of inorganic particles larger than 0,20 mm.

Construction:

• Depending on the required function, unit is delivered in two standard versions, EKOflow COMP1 which is equipped with an automatic fine sieve to extract solids and sand trap to extract sand and other solid particles, and EKOflow COMP3 which is additionally equipped with a grease trap to extract fat and other floating substances.

Operation principles:

• Waste water is transported to unit either by pump or gravity. Fine sieve separates all fine particles larger than the size of sieve perforations. Separated material is lifted by the shaftless spiral and is washed accordingly
• Thus purified wastewater flows to settling tank where the sand and other solid particles are settled to the bottom. If necessary, the air is inserted into wastewater to improve the effect of sedimentation. Shaftless spiral transports sand and solids particles to the receiving chamber from which it is drawn through the elevated conveyor. Thus separated sand and other solid particles are lifted, drained and if necessary washed
• In case of unit equipped with grease removal, the wastewater passes through an additional chamber which separates grease and other floating substances.

2 Sand classifier

EKOflow SAN 1

Basic measures:

Application:

• Used for small solids (sand) separation from sediment extracted from sand trap tanks.

Working principle:

• Waste water along with sediment solids (usually from sand trap tanks) enters the first chamber of the device, at the bottom of which there is aslope installed spiral. Sediment i.e. sand is settled down at the bottom of the chamber, and the spiral is used to transport it to the top of device, from where drained sand enters the municipal waste container.
• Treated waste water overflows into the second chamber and flows back into system (sand trap tank or channel)

3 Sand washer

EKOflow SAN 2

Basic measures

Application:

• Used for small size solids (sand) separation from sediment, extracted, from sand trap tanks

Working principle:

• The fluidized mixture of wastewater and sand enters through the inlet connection at the top of the device. The integrated mixer functions to separate the sand from the water and organic particles. The separated sand falls downward and settles at the bottom, where a spiral installed at an angle transports it upwards towards the top of the device and ejects it after draining. The spiral rotates in a lining-coated trough, which is easily replaceable.
• The treated wastewater exits through one outlet connection and returns to the system, while the separated organic particles exit through a separate outlet connection equipped with an electric motor valve.

4 Longitudinal sand/grease trap tank scraper

Basic measures:

• All measures of device parts are calculated from construction measures of the sand/grease trap tank, which are obtained from calculation of approximate waste water that will be processed.

Application:

• These devices are standard equipment for sand/grease trap tanks and are used for collecting small solids (sand) that is settled down at the tank bottom, on one side, and floating materials and grease on the surface of waste water.

Working principle:

• Longitudinal sand/grease scraper is a bridge structure that moves along the tank using rails. Two scrapers are installed on the bridge, first collecting solid sediment i.e sand on the bottom of the tank, and the other one collecting floating materials and grease on the surface of waste water.
• Collected sand on one side of the tank is lifted up using vacuum pump up to the sand classifier, while on the other side collected grease is pushed into channel with longitudinal (chain) grease scraper used to eject grease form the channel into aspecial tank or ditch.