Coarse screens

1 Automatic chain screen

EKOflow COR 1

Basic measures

Application:

• For mechanical pretreatment of wastewater/rainfall water, removes all particles larger than the wanted clear width between screen's bars immersed into the water, installation in channels.

Working principle:

• Device is installed into channel and heavily reinforced at the bottom and at the channel sides. Bottom part of device, immersed into the channel, consists of grid bars with specific clear width, and several driven sprockets. Rubber routers are installed on the front side of immersed part in order to direct water flow.
• On the upper part of device, on the drive axis, there are driving sprockets equiped with electric drive with reductor. On the rear part of the device there is an output outlet through which the collected material comes out and falls into the waste container or in the spiral transporter with press machine
• Sprockets are using rotation driving the chain, on which one or more combs are articulary placed. On the upper trajectory, comb together with chains travels along the screen and lifts accumulated solid material to comb cleaner placed at the top of device. Scraper pulls down the collected material from the comb, and lets it out through the outlet. After comb cycle is finished, comb is stopped in its initial position till the next automatic start.

2 Automatic coarse rotation screen

EKOflow COR 3

Basic measures:

Application:

• For mechanical pretreatment of wastewater/rainfall water, removes all particles larger than the chosen plates on the drum
• The device is multifunctional: its collects, transported and in the drain unit, it drains water from the collected waste.

Working principle:

• On the internal side of the static drum waste water flow accumulates bulk waste which is stuck to drum's plates. Rotation comb lifts the accumulated material up and throws it into the basin, and the material falla on the opened lower end of the spiral. Next the waste is using spiral rotation transported to the draining zone, where it is pressed and drained and then on the exit it is ejected through an outlet into the container for solid waste.
• Clean water is brought on the pressing zone, cleaning the sludges which remained after the pressing process. Cleaned sludge is drained back to the channel using pipes.

3 Schaftless screw press

EKOflow COR 7

Basic measures:

Application:

• For transporting and pressing-draining different kinds of solid and wet waste material
• It is installed on the outlet of the devices which have just separated solid material from the waste waters (for example, on the coarse screen outlet)

Working principle:

• The device consists of two main parts, amission and material transport zone, and draining-pressing zone. Material transport is conducted using shaftless spiral driven by an appropriate electric drive with reductor.
• By rotating the spiral, material is translated and pressed into the pressing zone, where the water is drained through a perforated sieve. At the end of the zone, there is a rotational lid with weights, which regulate the degree of pressing-draining.
• On the outside of the sieve rinsing is conducted in the pressing zone using water nozzles and the rinsed sludge is brought to the lower starting part of the basin and is discharged through the outlet.
• At the exit of pressing zone there is usually waste container used to collect solid drained material.

4 Coarse manual screen

EKOflow COR 9

Basic measures:

Application:

• Manual coarse screen consists of bar screen placed in the open channel. Placed that way, the screen represents an obstacle to all floating solid waste that remains on the screen. Collected material is manually removed using supplied rake.
• This kind of device is suitable for waste water treatment systems and for installation into bypass channels or into channels in front of device where bulk waste material can cause device malfunctioning.

Working principle:

• Screen bars, with specific clear width between bars, are obliquely placed into channel with the bottom end onto the basic slab at the channel bottom, and with the upper end on the waste container board. Waste water flow brings solid material on to the immersed screen. The waste remains on the front part of the screen if it is of larger dimensions than clear width between screen bars.
• After sufficient quantitiy of waste material is collected on the screen, operator pulls the material to the screen top and throws it into container placed at the top of channel using rakes. Container posesses a perforated bottom for material draining. Container discharge is conducted by operator, manually, and it is usually discharged into municipal container.

12 Lifting screen

EKOflow COR 15

Basic standard sizes:

Application:

• Lifting screen consists of a basket equipped with screen bars which is usually installed at the waste water inlet. Installed screen is an obstacle for all solid waste contained in sewage water and therefore waste remains on the screen. The collected waste is manually disposed by raising the screen and opening of swivel doors.
• This device is suitable for sewage systems, and in particular to be installed in pumping tanks where waste material can lead to malfunction in pump operation. Of course it is possible to apply it to other facilities in the sewage systems (shafts, etc.).

Operation principle:

• Screen bars, with the specific clear opening between the bars, are arranged vertically in relation to the incoming water flow in a semicircular arrangement. On such mounted screen waste water flow brings solid waste. The waste remains on the inside of the screen if it is larger than the clear opening between the screen bars, and falls into the lowered part of the basket.
• Once sufficient amount of solid waste is accumulated on the screen, operator simply pulls the basket out through the chain and the guide, and discharges screen by opening of swivel doors.