Waste / Landfill / Street-cleaning
Process waters are used at different stages of waste treatment. These can be purified and re-circulated.
For example, in the mechanical-biological waste treatment, heaps are sprayed with water. Part of the water, which is highly soiled with particles and dissolved substances, flow off. The water has to be purified to be able to reuse it. This can be done e.g. by an inclined filter or continuous belt filter.
The leachate contains particles, dissolved substances and biological contaminants. An economic treatment is therefore only reasonable through several process stages. Through precipitation and flocculation part of the dissolved substances are precipitated and can, together with the particles, be filtered out by a belt filter. Thus, the COD-load can be much reduced. This relieves the subsequent biological process significantly.
Treatment of road sweepings
For the cleaning of streets, places and footpaths, street sweepers are used in many municipalities. Thereby, the ground is sprayed with water, dirt swirled up with brushes and sucked into the vehicle. The discharged water of the street sweeper and the water used for the cleaning of the vehicle is collected in a pit. The water has to be separated from coarse material before it can be discharged into the canalisation. A continuous belt filter can be used for small amounts of dirt. It is advisable to additionally use a solids separator for larger amounts, e.g. loads of sand.
Pre-treatment of oil-containing sludge and washing waters
A further application is the pre-treatment of oil-containing sludge and washing waters. The high, and most of all varying load of solid particles causes operational disturbances in the subsequent treatment system. Depending on the quality of the material, the following processes can be applied. In case of a high sludge load, the sludge is flocculated and applied directly on a vacuum belt filter. For small sludge loads and high contents of oil, the medium is fed into a lamella separator first. Here the particles are separated and collected at the bottom, free oils float on the water surface and the water / emulsion is fed into the decomposition plant. Assemblies, as for example coalescers and inclined filters or belt filters can be used additionally.
The recycling of dirt from street drains and cleaning of sewers places special demands on the filter technology. Here, for example, large amounts of sand occur. The waste load, which is combusted, can be reduced through the use of a solids separator, having the positive side effect that the sand can even be sold as reusable material. Finer dirt particles, as for example dust, tire abrasion etc. can be separated by a lamella separator. A further drainage of the sludge can be done, for example by a dewatering container or for larger amounts by belt filter presses. The residue coarse material is mostly leaves, cigarette butts or the like. These materials can be removed, for example, with a rotation screen and disposed e.g. by combustion.
As varied as the types of dirt are, as varied the (water) treatment technologies have to be.
Advantages of the Leiblein-water treatment:
- Increased process stability, failure-free operation
- Reduced fresh water usage and costs
- Reduced wastewater pollution and costs
- Minimum energy and chemical consumption
- Low maintenance-, operation- and cleaning-effort
- Compact design, little space required
- Separate disposal, reduced environmental impact
In addition to supplying in-house manufactured appliances, Leiblein GmbH also offers installation of complete plants and other components (e.g. sludge presses). Due to our many years of experience in the fields of effluent and process water treatment, we are your competent partner.
In the following, we would like to give you an overview of projects we have implemented in the recycling industry. If you require any further information or explanation, please do not hesitate to contact us.