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Pile Cloth Filters for the San Martino di Castrozza Water Treatment Plant

The civil sewage treatment plant in San Martino di Castrozza, Trentino, has also been expanded with a pile cloth filtration section.

  • Free-fiber cloth filtration section with very high efficiency
  • TSS reduction from 40 mg/l to < 10 mg/l
  • Small footprint, minimal energy use
Company
Italian contractor on behalf of Autonomous Provincia Autonoma di Trento – Agenzia per la Depurazione
Year
2012
Location
San Martino di Castrozza, Trento province (Italy)
Interlocutor type
Contractor
Scope of application
Municipal Wastewater
Application field
Municipal
List of customer requirements
- Removal of suspended solids that may leak from secondary settling and those formed in the phosphorus post-precipitation section, located upstream of cloth filtration

- Compliance with the expected value for the TSS parameter for discharge to a surface water body, according to Legislative Decree No. 152/99
Input flow rate
1,000 m3/h (maximum hourly flow rate)
Input SST
< 40 mg TSS/l (average values)
Upstream treatment chain
- Secondary settling tanks

- Post-precipitation section


Technologies supplied
No. 3 disc filters mod. MSF 8/40 characterized by a filtering surface area per filter of 40 m2, for a total of 120 m2.
Output TSS
< 10 mg TSS/l
Key to Success
- Reduced impact on the environment of the discharge of purified water
- Smaller footprint than other tertiary filtration systems
- Minimization of energy use
- Easy to operate and maintain plant

1. Installation context

The resort of San Martino di Castrozza, in the province of Trento, is a well-known tourist destination. The resort’s civil sewage treatment plant serves a population of about 7,000, in addition to the seasonal tourist flow.
In 2012, the San Martino di Castrozza sewage treatment plant underwent tertiary finishing treatment upgrades.

MITA Water Technologies S.r.l. contributed to the implementation of this intervention by supplying three disc filters mod. MSF 8/40.

The tertiary finishing treatment, needed at the San Martino di Castrozza plant, was aimed at removing suspended solids that may leak from the secondary settling and those formed in the phosphorus post-precipitation section. Inlet total suspended solids values: less than 40 mg/l.

2. Proposed solution

MITA Water Technologies proposed the installation of three disc filters mod. MSF 8/40. MITA’s free-fiber ply filters allow depth filtration in strong analogy with sand filters, for very high efficiency of suspended particle removal.

The total filtering surface area is 120 m2, allowing the expected value for the TSS parameter to be achieved.

3. Results and key success factors

The upgrading of tertiary finishing treatment at the San Martino di Castrozza plant achieved the following objectives.

  • Reduction of the TSS value from 40 mg/l to < 10 mg/l, in line with the required parameters.
  • Reduction of the impact on the environment of the discharge of purified water.
  • Small footprint compared with other tertiary filtration systems.
  • Easy-to-operate system, minimal energy use.
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