Abstract
Surface runoff from urban area is a potential source of pollution of water bodies. The composition of pollutants in surface runoff depends on various factors and seasons. The main pollutants are oil products, suspended solids, COD, chlorides and other mineral salts. Traditional wastewater treatment plants include the mechanical removal of large items, debris and leaves; sand removal; water clarification in accumulating settling tanks; chemical dosing, contact filtration and deep purification on sorption filters. Filters with inert floating polystyrene media of various types are widely used as first stage filters. The operation of industrial filters in the technological schemes of wastewater treatment strongly depends on the backwash efficiency. Floating media flushing is carried out in the direction from top to down using the water accumulated in the over-filter space. The article presents the results of the study of pulsed flushing on a model plant. Experimental study was conducted on the real wastewater treatment plant. The kinetics of suspended solids and oil products removal from filter media was studied. The operational parameters and mode of pulsed flushing were determined. The research results were used during the reconstruction of Moscow surface runoff water treatment plants.
Highlights
The main contaminants of the surface runoff from urban areas are suspended solids, petroleum products, COD, chlorides, etc
Wastewater treatment plants generally include: mechanical stage using bar or mesh screens and grit chambers, water clarification in settling tanks which work as flow equalization basins; removal of the bulk of organic and mineral contaminants using sedimentation, flotation or contact filtration with preliminary reagent treatment; advanced treatment of residual mechanical impurities with petroleum products and organic matter adsorbed on
At the first stage of experiments, the analysis of water flushing efficiency of industrial filters operating in reagentless mode was carried out
Summary
The main contaminants of the surface runoff from urban areas are suspended solids, petroleum products, COD, chlorides, etc. The design of treatment facilities depends on their capacity, quality of surface wastewater from urban areas and requirements for its purification level [11–14].
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