1. Installation context
In 2014, an engineering firm in Ireland contacted MITA Water Technologies for the abatement of suspended solids in a local civil plant: the aim is to implement tertiary treatment, thus with high quality water output. Constant average plant flow rate of 750 m3/h, total suspended solids (TSS) concentration at inlet 20 mg/l TSS.
As for the treatment chain, a decanter for wastewater clarification is already installed upstream of the solution to be supplied.
2. Proposed solution
There are three peculiarities of Filtrasand sand filters proposed to the Irish engineering firm: high efficiency in removing suspended solids, low investment in acquisition and management, unique backwashing system with raw water (instead of filtered water).
The ten filters supplied by MITA Water Technologies are of the FS 6/1.5 type: 6 meters high, 6.15 m2 net filtering area per device.
The sand filters are designed to remove suspended solids in the water through the continuous regeneration filtration process: water is passed in an upward direction through a bed of filter sand, which retains the suspended solids while the cleaned water is collected at the top of the filter.
3. Results and key success factors
Treated effluent has an outlet suspended solids concentration of less than 10 mgTSS/l, thus meeting the required water quality requirements. Limits required by local regulations are of course met.
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