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05/26/2009 13:27 9518273 9 DOUGLAS KUNEY RAGE 05/14 mechanical aerators may reduce the faceequirement consid ly, but at the expense of si ifi t operating costs. Aerators are normally appliedto solve odor probl with .existing lagoons. So, aerobic processes are usually ill suited for lagooning Poultry wastes. Anaerobic systems are generally e lagoon stems of choice for treating poultry wastes. a systemsare designed on the basis of volume for a specified °t wa tee load, and can decompose stere organic c mateer unit of volume thAn ae r io processes. ThO balance of this dighussion will deal with anaerobic lagoon Systems. Iddolly, lagoon texpexature should be ca t at 95 F to maintain a balance between - o g amathana-forminq anaerobic bacteria. The lagoon will produt minimum odors when thwm bacteria groups are balanced. idweverr as° a .A. practical matter, the operator has littlecin 1 over r 1 t Rapid do in a e may i be avoided by the lagom an deep as ;possible. However, there are practical depth: deep lagoons r Sumer re slowly in shallow 1. a nott effect is t and 1 more slowly , more days of temperature are likely to be more a high dive few d of higher winter biologically g ; a e; when temperature of the Jago n fails into a range of 59 to 39 F, bacterial activity Isiminimal. Therefore,, a moderate depth QZ 8 to 12 f is generally a good compromise. The wide ea of temperatures givenfor m1nimal bacterial activity is due, in part, to the fact thatIthe lagoon process is , o of twO v diffO=Gnt tyPpes of bacteria. The first,. i - oseesis quite robust is active d 39 F. theco stage, methane formation, is more sensitive to chAnge, and .has vexy limited activity below 59 p. So,, acid lev4kls typically incromm during wint4r without significant utilization of acidsby methane bacteria. Consequentlyo e;son acidity produced during winter is similar in effjcj to lagoon overloading,, and contributes incr i its spring odor levels frM the Impon. Likewise, sudden +- . caanges upset, the ba fa ex t in an in a in id-fed disagreeable . s usually Occurs in early spring, and sometimes in the fall1 a winter of little bacterial action, but with loading of ° wasteials, higher spring waterincrease mioxvbial action, and foul odors are Sometimes genioratod as { bacteria pqpulations are re-*stablinhed. I ' Desirable combinations of bacteria groups itre obtained when, among other conditions, lagoon in betwe 7.0 7.5. Imbalances in pH are most Often a result 0 sudden tcharges , overloading, or slug leading of wastes.