"Which factors and framework conditions should be taken into account when planning a screenings treatment system?"

"The following factors should be considered for a reliable and economic screenings treatment facility:\r\n \tScreenings volumes (average and maximum per h) \tType of screenings (coarse screenings, fine screenings,...) \tDesired dewatering degree \tDesired washout degree \tInstallation situation \tFeeding (directly under screen, screw conveyor, flume,...) \tRedundancy requirements "

Machines for Screenings Treatment

Q: "Why is it useful to wash screenings?"

"Due to the highly carbonaceous composition of the loaded wash water, the C\/N ratio of the entire treatment plant influent is positively influenced. Depending on the screen aperture size and the inlet situation of the sewage treatment plant, the C\/N ratio can be improved by up to 6 %, and thus the denitrification performance in the case of unfavourable nutrient ratios in the sewage treatment plant.\r\nAfter washing, the screenings are compacted so that the water content in the washed screenings is significantly reduced. As a result of washing out the faecal matter, a significant improvement in screenings dewatering is observed in many cases."

Optimal screenings treatment systems for any application

Wash Presses

Screenings Compactor

Screenings treatment with high dewatering efficiency and maximum washout degree

The first step in wastewater treatment is normally the removal of solids from the wastewater flow by means of screens. The removed screenings contain household waste, faecal matter, toilet paper and mineral solids.

The screenings volume depends, not only on the separation size of the screen, but also on the type of sewer system.

The solids content of municipal screenings varies between 10 % and 25 %, depending on the type of screen. Approximately 90 % of the solids are volatile (organic).

Due to their very high water content, their heterogenous composition and unaesthetic appearance screenings must be treated before they can be disposed of.

FAQ

Frequently Asked Questions

The following factors should be considered for a reliable and economic screenings treatment facility:

Screenings volumes (average and maximum per h)
Type of screenings (coarse screenings, fine screenings,...)
Desired dewatering degree
Desired washout degree
Installation situation
Feeding (directly under screen, screw conveyor, flume,...)
Redundancy requirements

Due to the highly carbonaceous composition of the loaded wash water, the C/N ratio of the entire treatment plant influent is positively influenced. Depending on the screen aperture size and the inlet situation of the sewage treatment plant, the C/N ratio can be improved by up to 6 %, and thus the denitrification performance in the case of unfavourable nutrient ratios in the sewage treatment plant.

After washing, the screenings are compacted so that the water content in the washed screenings is significantly reduced. As a result of washing out the faecal matter, a significant improvement in screenings dewatering is observed in many cases.

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