Treatment of road runoff by coagulation/flocculation and sedimentation

• A laboratory investigation of the treatment potential of a coagulation process in the context of stormwater treatment was undertaken. The initial 25 L road runoff generated from four rain events was collected and subjected to a jar-testing regime with two commercial coagulants. The treatment effect was assessed by analysing the runoff before and after treatment for turbidity, suspended solids and metal content. The coagulation process resulted in particle and total metal reduction of more than 90% compared to 40% for only sedimentation. Up to 40% reduction of dissolved Cr, Cu and Pb was also observed compared to 0% for sedimentation. This study shows that coagulation may be a useful process for stormwater treatment systems when the treatment requirements are high.

Subject headings

TEKNIK OCH TEKNOLOGIER  -- Samhällsbyggnadsteknik -- Vattenteknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Civil Engineering -- Water Engineering (hsv//eng)

Keyword

advanced stormwater treatment

coagulation

metals

particles

road runoff

suspended solids

VA-teknik

Urban Water Engineering

Centre - Centre for Stormwater Management (DRIZZLE)

Centrumbildning - Centrum för dagvattenhantering (DRIZZLE)

Publication and Content Type

ref (subject category)

art (subject category)