By Nicholas P. Cheremisinoff
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Endogenous respiration is maximized in this type of plant, consequently 25 to 35 day solids retention times are not uncommon. Because of the long aeration time, they do suffer heat losses because of this long net 32 Biotechnology for Waste and Wastewater Treatment growth, extended aeration plants can be expected to nitrify unless the temperature is less than 10°C. Contact Stabilization Plants--Contact stabilization plants are not well suited for complete nitrification because insufficient biological mass is present in the contact tank for complete nitrification of ammonia.
The BOD,/TKN ratio must be sufficiently low to ensure a significant fraction of nitrogen to biomass. Some alternative pretreatment systems used are chemical treatment in activated sludge, roughing filters, and trickling filters. In addition to the separate stage trickling filter, Rotating Biological Contactors are very adaptable to separate stage nitrification. The purpose for RBD combined carbon oxidation/nitrification may be applied to separate stage nitrification. The only difference is if the secondary effluent being treated has a BOD, or suspended solids content of less than 20 mg/l, the secondary clarifier may be eliminated.
At a minimum temperature of lO"C, the hydraulic retention is about 14 hours whereas at a 2O"C, the retention time is decreased to 6 hours. Therefore, location and temperature of the plant must be determined before sizing. Extended Aeration Plant--Extended aeration plants are similar to complete mix plants except that hydraulic retention times are 24 to 48 hours instead of 2 to 14 hours used in the complete mix plants. Endogenous respiration is maximized in this type of plant, consequently 25 to 35 day solids retention times are not uncommon.
Biotechnology for Waste and Wastewater Treatment by Nicholas P. Cheremisinoff