Filtri a Tela Pile per il Depuratore di San Antonino Ticino

Pile Cloth Filters for the Sant'Antonino Ticino WWTP

The large public sewage treatment plant in Sant’Antonino Ticino, Varese province, needed further expansion and deepening of the tertiary treatment section: MITA Water Technologies supplied 12 ultra-high-efficiency cloth disk filters.

  • Public sewage treatment plant with nearly 100,000 m3/day average flow rate with need for expansion
  • Pile cloth filters for 1,440 m2 of filtering area and very high efficiency
  • Suspended solids in output: < 10 mg/l
Edil Alta Ltd. (contractor) on behalf of Tutela Arno Rile e Tenore (consortium)
Sant'Antonino Ticino, province of Varese (Italy)
Interlocutor type
Scope of application
Municipal Wastewater
Application field
Municipal Utilities
Story in a nutshell
The Sant'Antonino Ticino wastewater treatment plant, operated by ALFA SRL, can treat municipal wastewater totaling 335,000 population equivalent (PE), with an average flow rate of 95,500 m3/day and 27 municipalities served (plus Malpensa Airport). In the 2000s, it was decided to expand the plant with sludge flocculation and final filtration lines.
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
5,600 m3/h (average flow rate)
Input SST
35 mgTSS/l (average amount)
Upstream treatment chain
Primary and secondary treatments (complete public sewage treatment plant)
Technologies supplied
No. 12 disc filters, model MSF 24/120 PPC: filtering area 120 m2 per system, total filtering area 1,440 m2.
Output TSS
< 10 TSS/l
Output of other treatments
Up to 7,500 m3/hour of treated sewage
Key to Success
- Reduced impact on the environment of the discharge of treated water
- Smaller footprint than other tertiary filtration systems
- Minimization of energy consumption
- Simple operation and maintenance plant

1. Installation context

The civil sewage treatment plant of Sant’Antonino Ticino, in the province of Varese, managed by ALFA SRL, serves a population the approximately 335,000 AE.

In 2011, the managing entity awarded Edil Alta srl the contract for the expansion of the purifier, including the implementation of wastewater treatment by tertiary filtration with the objective of reducing total suspended solids at discharge, so as to meet the requirements of Italian Legislative Decree No. 152/99.

2. Proposed solution

MITA Water Technologies proposed the installation of 12 disc filters, model MSF 24/120 PPC. The total filtering area is 1,440 m2, as each unit supplied consists of 24 discs each and a filtering area of 120 m2.

The solution made it possible to achieve an TSS output of less than 10 mg/l (from the 35 mg/l input) and to treat up to 7,500 m3/hour of sewage in case of load increases.

3. Results and key success factors

Sand filters and cloth filters are the best-known technologies for wastewater finishing by tertiary filtration: in MITA systems of the second type, filtration on cloth takes place by gravity and with the machine completely stopped: no back-up units or service water are required during the backwashing phase of the cloths, which is carried out using the same filtered water and with minimal energy use.

Efficiency due to depth filtration, very low consumption, no need for additional water for backwashing: these points are key results for awarding tertiary treatment to MITA Water Technologies.

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