28,814 Gallon Anoxic Denitrification Mixing System for Waste Treatment:

Anoxic mixing applications require uniform mixing to blend liquor with the incoming flow scheme.  The mixture typically ranges from 0.25 to 0.5% by weight solids or 2,500 to 5,000 mg/liter.  

Before discharging a specified flow to a stream, river, lake or other water source, the waste nutrients that promote the growth of algae must be removed from that discharged flow.  Nitrogen and phosphorus are the most common pollutants that promote the uncontrolled growth of algae.  An Anoxic mixing basin, placed as part of the flow scheme will accomplishes this nutrient removal.  

Faculative bacteria use organic carbon in the waste as both a carbon source and an energy source.  Nitrate is used as an electron acceptor in energy metabolism.  Through bacterial action, the bacteria first reduces nitrate to nitrite and then to Nitrogen, which is then released to the environment as a harmless gas.  The denitrification system is generally a closed system to minimize oxygen absorbtion from the atmosphere.  The use of a hermetically sealed mixer or a simple water manometer is generally preferred.  To minimize pressure build-up due to the evolution of nitrogen gas, venting is required.   

1. Maximum Specific Gravity = 1.09
2. Viscosity Range = 500 centipoise max.
3. A standard 28,814 Anoxic storage tank, 16' long x 16' wide x 16' tall with 14' Side Water Depth (SWD) supplied by others.  
4. A vertical-on-tank-centerline mounting arrangement is used 
5. No in-tank anti-swirl baffles are required. 
6. 316D/316 Stainless Steel mixer wetted parts.
7. 230/460 Volt Power source.
8. Mixer support bridge supplied by others.     

The advantages are significant:

1. Lower horsepower 3/4. 
2. Engineering Mixer Specification
3. Pedestal mounted with coupling above mounting surface, easy maintenance design.
4. Mixer price complete = $5,328 US Dollars Each. 
5. Hydrofoil in combination with lower mixer speed, creates lower fluid shear, which maximizes polymer chemical efficiency.    

Complete design for 28,84 gallon Anoxic mixing basin application. Includes mixer engineering specifications, complete mixer pricing, tank drawing, mixer mounting orientation for waste water treatment systems.

04.27.10