Turbidity Control by Chemical Flocculation: Basic Concepts

While the US EPA has withdrawn its proposed turbidity limit on construction site runoff, there are still many states have or are proposing their own enforcement levels.  Construction site owners and managers are also looking for ways to avoid public outcry and potential lawsuits over muddy water leaving their site.  In most cases, typical and even more advanced erosion and sediment control practices will not prevent discharges that look like chocolate milk.  This two-part seminar will explore the principles behind chemical treatments to rapidly settle suspended solids and reduce turbidity in runoff from construction sites.  In the first part, McLaughlin will discuss ways to make typical practices work much better and then explore the turbidity problem and how chemical treatment can solve it. 

Learning Objectives:

  1. Particle sizes and surfaces, suspended solids, turbidity, and Stoke’s Law.
  2.  Coagulation, flocculation, and their basic chemistry.
  3.  The key principles of successful flocculation.

Course Level: Basic

Credit Information

Activity Number Credit Amount Accreditation Period
IECA CEU Webinar 0.1 CEUs from November 20, 2013