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.
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.
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.
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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A solution for high filtration yields and efficient handling and backwashing, with only two pumps for the whole system: the PPC and PPC VM disc filters are for concrete or metal tank, respectively. Versatility and little ancillary work required for operation.
In this area, contractors and engineering firms contacted by municipalities face a number of challenges: knowledge of regulations, managing costs, and selecting cost-effective solutions. MITA Water Technologies can support them with its efficient and easy-to-manage solutions.
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