Different processes are used for wastewater treatment depending on the size of the sewage treatment plant. Flottweg decanters for thickening and dewatering sewage slurry are used in various stages of wastewater treatment. Sewage slurry that has been de-watered using a decanter is suitable for all possible methods of further use or disposal – whether in agriculture, incineration or landfill.

Flottweg decanters can be adapted to all conceivable process engineering requirements. Thanks to decades of experience and consistent further development, we achieve the best dewatering results, whatever the sludge!

Flottweg OSE decanter for thickening sewage slurry

Thickening sewage slurry means concentrating surplus slurry produced in the biological stages from 5 to 10 g/l total dry solids to 5 to 8%, before it is pumped into the digestion tower. The slurry volume is reduced by 90 to 95% in this process.

The Flottweg OSE decanter (OSE refers to optimum sludge thickening) has been designed for this purpose. It is characterised by its high performance, reliability and efficiency. The latest studies into fixed costs (capital and personnel) and variable costs (electricity, water and polymer consumption as well as spare parts) prove that the decanter offers decisive advantages compared to other thickening units.

Your advantages in thickening sewage slurry:

• Optimised operating costs due to high throughflows and long operating times
• Significant reduction in energy consumption
• No or only very small polymer requirement
• No cleaning cycle during the operating phase
• Highly effective wear protection
• As a rule, spare and wearing parts are replaced on site, which is also where operating safety checks (accident prevention regulations) are carried out
• Lower procurement costs and reduction in process costs due to continuous and automatic operation
• Compact design, low space requirement and high throughflow rates
• Closed design in order to reduce odour emissions
• Also suitable for processing mixed and primary slurry

Flottweg HTS decanter for dewatering sewage slurry

Irrespective of whether the sludge will be transported, recycled, taken to landfill or incinerated after dewatering, it is decisive for it to be as dry as possible. Other important factors include economical polymer, energy and water consumption as well as a low requirement for spare parts. The optimum solution for this is the Flottweg HTS decanter for dewatering sewage slurry. The decanter for throughflows from 10 to 180 m³/h offers decisive advantages compared to other units.

Your advantages in dewatering sewage slurry

• Reduction in operating costs due to optimum performance
• Maximum dry matter content with minimum polymer requirement
• Significant reduction in energy consumption
• Optimised process costs due to continuous and automatic operation
• No cleaning cycle during the operating phase
• Highly effective wear protection
• As a rule, spare and wearing parts are replaced on site, which is also where operating safety checks (accident prevention regulations) are carried out
• No consumables such as filter media, filter cloths, etc. are required
• Automatic adaptation to variable speed and operating conditions during operation, by the PLC or remote monitoring