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<br /> The aerobic digestion takes place in the second compartment of the EnviroServer. The
<br /> EnviroServer utilizes a combination of an attached and suspended growth process. The attached
<br /> film is growing on a biomedia and the suspended growth is created by mixing and recirculation of
<br /> sludge. This combination results in a treatment efficiency that exceeds the individual performance
<br /> of an attached or suspended growth process.
<br /> The aerobic digestion of organic matter is mainly affected by dissolved oxygen, pH, temperature,
<br /> — mixing, and solids retention time. The design of the EnviroServer optimizes these parameters for
<br /> maximum CBOD5 and nitrogen removals,6, 10
<br /> r The fourth compartment is the clarifier where final settling of suspended solids and clarification of
<br /> the effluent is taking place. The tank design is optimized with respect to the following parameters:
<br /> waste water flow rate, sludge settling rate, sludge removal, surface area, tank depth, overflow
<br /> rate, inlet device, and tank configuration9. It is designed for optimum performance without any
<br /> chemical addition. The settled solids are recirculated back to the first compartment.
<br /> The fourth compartment is followed by a custom designed disinfection unit. The disinfection
<br /> consists of a chlorinator and disinfection contact chamber 15 16. The contact chamber also serves
<br /> as a reservoir for water re-use, such as irrigation. The disinfection mechanisms with chlorine are
<br /> not entirely known. The theories include oxidation, reactions with chlorine, protein precipitation,
<br /> modification of cell wall permeability, and hydrolysis and mechanical disruption16. The germicidal
<br /> efficiency of disinfection, as measured by bacterial survival, depends primarily on the
<br /> concentration of chlorine added and the contact time. The disinfection contact compartment in the
<br /> EnviroServer is designed for a minimum of 90 minutes effluent residence time. The chlorinator is
<br /> designed to ensure a 0.5 ppm level of free chlorine in the contact chamber. Testing has shown
<br /> that at 0.5 ppm free chlorine, the coliform is maintained below 2.2 CFU/100 ml. This dosage will
<br /> have a minimum effect on pH, which will stay between 6 and 9.
<br /> —
<br /> References
<br /> 1. Axelrod, B., "Waste Treatment Device and Method Using Microwaves", Patent No. 4,631,133
<br /> (1986).
<br /> 2. Shades, R.C., et al, "Waste Treatment Device and Method Employing the Same", Patent
<br /> Pending, Filed: July, 1997 Amended: Jan, 1998.
<br /> 3. "Design of Municipal Wastewater Treatment Plants Volume I", WEF Manual of Practice No.
<br /> 8/ASCE Manual and Report on Engineering Practice No. 76 (1992).
<br /> 4. "Design of Municipal Wastewater Treatment Plants Volume II", WEF Manual of Practice No.
<br /> 8/ASCE Manual and Report on Engineering Practice No. 76 (1992).
<br /> 5. "Operation of Municipal Wastewater Treatment Plants Volume I", Manual of Practice No. 11
<br /> — Fifth Ed., WEF (1996).
<br /> 6. "Operation of Municipal Wastewater Treatment Plants Volume II", Manual of Practice No. 11
<br /> Fifth Ed., WEF (1996).
<br /> — 7. "Operation of Municipal Wastewater Treatment Plants Volume III", Manual of Practice No. 11
<br /> Fifth Ed., WEF (1996).
<br /> r 8. "Nutrient Control', Manual of Practice No. FD-7, Water Pollution Control Federation,
<br /> Washington, D.C. (1983).
<br /> 9. "Clarifier Design", Manual of Practice FD-8, Water Pollution Control Federation, Washington,
<br /> D.C. (1985).
<br /> 10. "Wastewater Biology: The Microlife", A Special Publication, WEF, Alexandria, Virginia (1990).
<br /> r
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