Filtri a Tela Pile per il Depuratore di Storo

Pile Cloth Filters for Storo Wastewater Treatment Plant

Output amounts of suspended solids less than 10 mg/l, small footprint compared to other tertiary filtration solutions, minimal energy use-these are the winning features of MITA’s free-fiber cloth filters installed at the Storo sewage treatment plant.

  • Expansion of tertiary treatment of a public sewage treatment plant in the province of Trento
  • Selection of three cloth disc filters, total filter area of 120 m2
  • TSS input: <40 mg/l; TSS output: < 10 mg/l
Autonomous Province of Trento - Depuration Agency
Storo, Province of Trento (Italy)
Interlocutor type
End customer
Scope of application
Municipal Wastewater
Application field
Municipal Utilities
Story in a nutshell
MITA Water Technologies S.r.l. contributed to the construction of the tertiary filtration section of the Storo (TN) plant of the Autonomous Province of Trento - Agency for Depuration.
List of customer requirements
- Removal of suspended solids that may escape from secondary settling and those formed in the phosphorus post-precipitation section, located upstream of cloth filtration

- Compliance with the expected value for the parameter TSS (total suspended solids) for discharge to a surface water body, according to Italian Legislative Decree No. 152/99

Input flow rate
1,000 m3/h (maximum hourly flow rate)
Input SST
< 40 mg TSS/l
Upstream treatment chain
Primary, secondary and tertiary treatments
Technologies supplied
No. 3 disc filters on cloth, model MSF 8/40 PEC: filtering area of 40 m2 per system, total of 120 m2.
Output TSS
< 10 mgTSS/l
Key to Success
- Effective and compact solution for push separation of suspended solids still contained in the purified and decanted water from secondary settling
- Reduced impact on the environment from the discharge of the treated water
- Smaller footprint compared to other tertiary filtration systems
- Minimization of energy use
- Simple operation and maintenance

1. Context of installation

The Autonomous Province of Trento – Purification Agency is a public agency that manages the wastewater treatment service in the province of Trento. The Storo (Province of Trento, Italy) plant is one of the main wastewater treatment plants in the province.

In 2011, the Storo plant underwent an upgrade of the finishing part of the tertiary treatment: in this context, MITA Water Technologies S.r.l. contributed to the construction of the cloth filtration section.

The objective was to remove suspended solids that may leak from the secondary settling and those formed in the phosphorus post-precipitation section. The expected value of total suspended solids (TSS) for discharge to surface water body was less than 10 mg/l.

The amount of total suspended solids at the inlet was less than 40 mg/l. Water flow rate per hour: 1,000 m3/h.

2. Proposed solution

MITA Water Technologies proposed the installation of three cloth disk filters, model MSF 8/40 PEC. The total filter surface area is 120 m2, enabling the expected value for the TSS parameter to be achieved.

3. Results and key success factors

The upgrading of the cloth filtration section of the Storo plant achieved a very significant set of objectives.

  • Reduction of the TSS value from 40 mg/l to < 10 mg/l, in line with legal parameters.
  • Reduction of the impact on the environment of the discharge of purified water, in accordance with regulations.
  • Minimization of energy use.
  • Smaller footprint than other tertiary filtration systems.
  • Simple operation and maintenance.
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