Experimental set for testing methods of industrial wastewaters treatment with the use of flotation techniques

Abstract

This paper presents a set for testing industrial wastewaters in technical scale using physicochemical methods of their pretreatment at the source of their origin with flotational precipitation of flocculated and thickened dispersed fractions. The installation constructed on a mobile pallet of capacity up to 1.0 m 3 /h is equipped with a central, cylindrical-conical process reactor with a slow-speed frame agitator (or with an optional flotator and a surface flotate skimmer), tubular reactors where chemical reagents are dispensed from their preparation and dosing stations, as well as with the process nodes to conduct flotation techniques with induced air (IAF) and/or dissolved air (DAF) according to the own invention or with the assistance of oxidation (OxIAF and/or OxDAF). Using this test set, different methods of physicochemical pretreatment can be optimised by means of i.a.: coagulation, chemical precipitation or deep oxidation and final separation of the dispersed phases with mentioned flotation techniques supported by oxidation with e.g. hydrogen peroxide.

Treatment of the railway freight wagon wash effluents by coagulation methods on accelator reactor

“…At the preliminary stage of this research [60], coagulation methods were selected, with the indication of double-stage coagulation to pretreat the tested wastewater. This approach was introduced by the results obtained in laboratory scale, proving unequivocally that the use of one-stage coagulation with acidic aluminum or iron coagulants with pH correction using 5.0 or 7.5% aqueous NaOH solution or 5.0% aqueous Ca(OH) 2 solution does not allow us to obtain repeatability of levels of removal regarding basic indicator parameters within satisfactory limits for statistically typical loads of RW.…”