||Mechanism of Waste Treatment at Low Temperature. Part A: Microbiology.
Morriso, S. M. ;
Newto, Gary C. ;
Boon, George D. ;
Marti, Kirke L. ;
||Colorado State Univ., Fort Collins. Environmental Resources Center.
||Completion-33; DI-14-31-0001-3006 ;DI-14-31-0001-3206; OWRR-A-007-COLO; 00139,; A-007-COLO(1)
( Sewage treatment ;
Cold weather tests) ;
Performance evaluation ;
Biochemical oxygen demand ;
Microorganism control(Sewage) ;
||Some EPA libraries have a fiche copy filed under the call number shown.
Low temperatures adversely affect wastewater treatment efficiency by decreasing rates of biological oxidation. Because of the importance of adequate treatment efficiency, the feasibility of inoculating psychrophiles into a wastewater treatment system to increase biological oxidation rates at low temperatures was investigated. Three psychrophiles capable of relatively rapid growth or oxygen uptake in sterilized sewage were selected from water and soil isolates as well as three of 97 Alaskan isolates. With heat sterilized sewage the effects of cell numbers and temperature were the most significant while organism growth type and culture age were also significant. At 5C, the Alaskan psychrophiles removed substantially more BOD within a 72 hr detention period than untreated controls; however, within a 120 hr period, BOD removals never averaged greater than 31.3%.