Catalogue

Plants, equipment and machines for water treatment

FTG

The gravity drum filter is generally used for tertiary treatments, for the primary and sewage water filtration for civil and industrial application. They are used in the event it is necessary to obtain an effluent to be reused, therefore particularly limpid and with a reduced presence of organic and suspended matters. This type of filter consists of a sturdy cylinder around which a special polyester felt sheet is wound, a gear motor, a complete system for the back washing comprising spray nozzles, back washing pump, piping and relevant valves, pneumatically controlled valves, compressor interlocked with the valves, electric control panel. The filtering drum is usually housed in a structural metal container, totally closed; on request, the type for installation in concrete tanks can be supplied.
During the normal operation, the cylinder is motionless and the filtration occurs from the outside to the inside. The special felt allows the trapping of the suspended solids whose diameter is equal to or greater than the filtering gap. At this stage there is no energy consumption. If, due to the progressive clogging of the drum, the tank water level reaches an established value, the back washing stage is activated automatically without any interruption of the filtration process. The spray nozzles, placed inside the drum, not submerged in water, clean the drum with a pressurized water jet from the inside to the outside. The particles removed by means of the back washing are sent away by means of piping. The whole back washing stage occurs with the drum in slow rotation, in order to clean the whole filtering surface. The strength of this ultra-filtration system are the completely automatic operation, the very low energy required and the back washing which is made without interrupting the filtration process.
The standard type of construction is in stainless steel.

Strenghts

• BACK WASHING CARRIED OUT WITHOUT INTERRUPTING THE FILTRATION PROCESS.
• VERY LOW ENERGY REQUIREMENTS.
• LIMITED HEADLOSSES.
• COMPLETELY AUTOMATIC OPERATION.
• MINIMUM MAINTENANCE REQUIREMENTS.
• LONG LIFE.