Treatment of liquid effluents and sludge dewatering Water treatment in the ceramic an natural stone industry

[Translate to Englisch:]

Die Aufbereitung von Natursteinwasser ist seit einigen Jahren ein wichtiges Teilgebiet unserer Tätigkeit. Unsere Anlagen bieten eine Vielfalt an Möglichkeiten, das in den steinverarbeitenden Betrieben anfallende Abwasser zu reinigen. 

Idealerweise werden die Produktionsabwässer in einer zentralen Vorlage gesammelt und von hier aus der nachfolgenden Stufe (Sedimentation oder Filtration) zugeführt. Es ist aber auch möglich, die Behandlungsstufe aus verschiedenen Vorlagen zu bedienen. Bei der Auslegung der Vorlage ist zu beachten, dass Schwankungen im Zulauf sicher ausgeglichen werden können. Sie soll jedoch nicht zu groß sein, damit nicht schon hier Ablagerungen entstehen. Zur Reduzierung von Ablagerungen eignen sich z.B. Rührwerke oder pneumatische Aufwirbeleinrichtungen.

Normalerweise stellt die Sedimentation die erste Behandlungsstufe des Abwassers dar. In der Vergangenheit wurden oft einfache Absetzbecken oder Klärteiche verwendet. Besonders bewährt hat sich der Einsatz von Lamellenklärern (Schrägklärer).

[Translate to Englisch:]

Diese Einrichtungen sind sehr kompakt und können für den Betrieb mit und ohne Flockungsmittel ausgelegt werden. Der entstehende Schlamm kann dann z.B. über Big Bags, Entwässerungscontainer oder Vakuumbandfilter entwässert werden.

Das gereinigte Wasser aus dem Schlägklärer wird meist über Gefälle in einen Vorlagetank geführt. Von hier aus wird es mit einer Druckerhöhungsanlage wieder zu den einzelnen Bearbeitungsmaschinen gepumpt. 

Bei kleineren Abwassermengen von bis zu ca. 10 m³/h kann je nach Feststoffgehalt auf eine Sedimentation verzichtet und das Abwasser direkt auf einen Vakuumbandfilter (VBF) geführt werden. In diesem Fall werden die Behandlungsstufen "Sedimentation" und "Schlammentwässerung" zusammengefasst, wobei das Abwasser in einem Schritt gereinigt und der Feststoff in einen stichfesten Zustand überführt wird.

Pilot plants of Leiblein

Our products are available to rent for pilot tests. Due to our extensive rental park, we can put together complete test systems individually for your task.

Versatile applications References

Treatment of stone grinding water in the processing of fireproof ceramic
The project

In a factory where fireproof ceramic is produced, the products are processed mechanically (cut and grinded) after firing. Water is used to cool down the processing tools. After the processing the water is polluted with fine ceramic particles.

To be able to reuse the water or discharge it into the canalization the dirt particles have to be removed. For this purpose Leiblein GmbH developed an innovative treatment system.

Impressions
Functional description

The polluted grinding water is collected in a pit and with a centrifugal pump led to a flocculant plant and finally to the lamella separator. By addition of flocculant, even the finest particles can be separated. Sedimentable particles are separated in the lamella separator. The purified water flows into the clean water tank and is pumped back to the grinding machines with a centrifugal pump.

The sediment accumulates in the sludge funnel and is kept in a liquid state by a rabble rake. An eccentric screw pump pumps the sludge at regular intervals into a dewatering container for further drainage.

The plant constantly runs during the production processes, after the processes are stopped, the rabble rake still runs for a certain time while the clean water pump is turned off. Waterlosses are automatically compensated by the system.

Salt extraction from brine
The project

Salt extraction from brine offers significant advantages, compared with conventional mining. No costly shafts and tunnels are required and fewer personnel are needed.

Impressions
Functional description

The brine is soiled with chalk, plaster, clay and so on. The brine is led into a Leiblein lamella separator. Sedimentable particles separate and accumulate in the sludge funnel. The sludge is pumped into a filter press for further thickening or dewatering.

Treatment of concrete cutting water
The project

In a factory where newly produced concrete slabs are cut, cooling water is needed for the cutting machines. The concrete is not fully hardened yet. In order to reuse the water, solids and other particles which can deposit in the pipes and nozzles have to be removed.

Impressions
Functional description

The polluted cutting water is pumped into the Leiblein lamella separator. The solids settle onto the lamellas and slide into the sludge funnel at the bottom. The clarified water flows to the top and into the clean water tank.

The sludge and coarse solids are exported by a conveyor screw. In comparison to eccentric screw pumps the conveyor screw has the advantage that also larger particles can be exported and that the solids are much dryer.

Technische Daten
Water inlet lamella separator0,5-1,5 m3/h
Clarifying area:6 m²
Clarifying area load0,08-0,25 m³/m²*h
Material lamella separatorsteel coated
Material lamellaePP
Lamella distance40 mm
Inclination60°
Discharge screwØ 250 mm / Hardox
Plaster water purification in a brickwork
The project

The moulds used for brick production are made of plaster which pollutes the water used for the processing. The effluent, containing plaster particles of all sizes, is treated by a two-stage process planned by Leiblein GmbH.

At first the larger plaster particles are removed from the effluent with a conveyor screw. Then the plaster water is purified of the fine particles by a Leiblein lamella separator.

Through this process it was possible to convincingly meet the high demands on the purity of the effluent.

Impressions
Treatment of water in a porcelain factory
The project

The wastewater of a porcelain factory is collected in a pit, which acts like a buffer and equalises the amount of water. The water is led to a flocculation stage, where flocculant (for example: Sachtofloc 46.12 ) is added to gain easily sedimentable flocks.

The water flows gently into the lamella separator, where the flocks are separated. The clarified water flows into another pit and is either led into the canalisation or reused.

The sludge, which is collected in a funnel at the bottom of the lamella separator, is led into a container and gets pumped into a filter press for further thickening.

Impressions

Treatment of liquid effluents and sludge dewatering Leiblein products for the ceramic and natural stone industry