Volume 2-05, Chapter 3 - City of Wichita
Volume 2-05, Chapter 3 - City of Wichita Volume 2-05, Chapter 3 - City of Wichita
Section 3.3.2 - Gravity (Oil-Water) Separator This page intentionally left blank. Page 3 - 156 Volume 2, Technical Guidance
Section 3.3.3 - Alum Treatment 3.3.3 Alum Treatme nt Secondary Water Quality Facility Description: Chemical treatmentt of stormwater runoff entering a wet pond by injecting liquid alum into storm sewer lines on a flow-weighted basis during rain events. ADVANTAGES / BENEFITS: • Reduces concentrations of total suspended sediments, phosphorus, and heavy metals DISADVANTAGES / LIMITATIONS: • Dependent on pH level ranging from 6.0 to 7.5 during treatment process • Intended for areas requiring large-scale stormwater treatment from a piped stormwater drainage system • High maintenance requirements • Alum application will lower pH of receiving waters • High capital and operations and maintenance costs MAINTENANCE REQUIREMENTS: • Adjust dosage to ensure proper dosage and delivery of runoff to the settling pond H H/ M H H KEY CONSIDERATIONS • Dredge settling pond and properly dispose of accumulated floc POTENTIAL* POLLUTANT REMOVAL Total Suspended Solids Nutrients – Total Phosphorus & Total Nitrogen Metals – Cadmium, Copper, Lead & Zinc Pathogens – Coliform, Streptococci & E. Coli STORMWATER MANAGEMENT SUITABILITY Water Quality Protection Channel Protection On-Site Flood Control Downstream Flood Control Accepts Hotspo Runoff: Yes, For Lined Off-line Ponds IMPLEMENTATION CONSIDERATIONS L Land Requirements H Relative Capital Costs H Maintenance Burden Residential Subdivision Use: Yes High Density/Ultra-Urban: Yes Drainage Area: 25 acres min. Soils: No restrictions Other Considerations: • Regional Treatment L=Low M= =Moderate H=High *Depends On Specific Installation Volume 2, Technical Guidance Page 3 - 157
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<strong>Volume</strong> 2, Technical Guidance
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