please help :( thanx A water quality analysis of the stormwater water running of
ID: 896621 • Letter: P
Question
please help :( thanx
A water quality analysis of the stormwater water running off from the site showed that turbidity was high and that discharging this turbid water into the receiving estuary would be problematic as it could affect the fisheries habitat. A settling pond is proposed, along with the addition of a coagulant to enhance the removal of these fine particles. Ferric chloride is selected as the coagulant because it is relatively inexpensive and has been demonstrated to work well at other sites. You are performing a jar test to assess the feasibility of using ferric chloride to remove the colloids. It is forming floes abundantly for the first 4 minutes and then rather suddenly the solutions goes clear and the floes disappear (and they have not settled at the bottom of your jar testing apparatus). Calculations are not necessary, however to support your answer use equations, diagrams and consider existing and possible site conditions, to explain what is has likely to cause this effect.Explanation / Answer
For the treatment of stormwater, usually use FeCl3 to treat turbid water, the turbidity is due to the presence of P, metal or organic substances. Stormwater generally contains a wide variety of colloidal impurities, which are not settled by gravitation in natural sedimentation process and can pass through the pores of most common filtration media. These colloidal particles are present in wastewater in well-stabilized form. The removal of colloids and suspended solids (SS) from wastewater needs destruction of the stabilizing forces leading to coagulation. In order to do so, the coagulant FeCl3 is the suitable material is an important in the removal of SS and TDS.
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