Page 8 - Opportunities in the Treatment of Water and Other Wast Streams
P. 8
Application:
Why: To provide initial separation of suspended solids as a part of a high rate clarification. Use after conventional coagulation/flocculation in both mobilized container units for on-site recycling or in centralized facilities at off-site locations.
Where: On-site facilities and off-site locations. Target Contaminants:
Suspended solids
Aggregated compounds including iron, manganese, zinc, naturally occurring organic matter, and radionuclides targeted by coagulation chemicals (in combination with conventional coagulation and flocculation)
Benefits:
• Low chemical demand • Easy to operate
• Mobile units Limitations:
• Moderate maintenance
• Long hydraulic retention time • Poor removal of oil and grease
Plate settlers use gravity to separate and remove suspended solids. Water usually flows from the coagulation/flocculation unit directly to the plate settler. In the settler, water flows upward along inclined plates to separate suspended particles from the main water stream. Plate settlers decrease the time required for settling by operating in the reverse direction of the separation mechanism, gravity, to promote removal. Plate settlers are designed to funnel or collect particles that accumulate for easy thickening or removal to
8
