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Feasibility study evaluates hydrocyclone for reducing wastewater volume from tunneling sites, suggesting effective particle separation.
On the tunneling site Perjen (Tyrol, Austria) thin concrete layers are removed by water jet cutting from the wall inside the tunnel. In this process, a daily volume of 5-10 m³ of wastewater is produced which is stored temporarily on-site and periodically taken away by a waste disposal company. In order to reduce disposal costs the reduction of the wastewater volume by mechanical treatment is required. Therefore, a hydrocyclone was tested on-site for evaluation purpose. The particle concentration in the underflow of the hydrocyclone is 32 % (average) higher than the inlet particle concentration, whereas the overflow concentration is 28 % (average) smaller than the inlet particle concentration. In conclusion, particle separation by a hydrocyclone is partly possible for the present wastewater.
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Senfter et al. (2020) studied this question.
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