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r- <br />I <br />OPERATIONAL DESCRIPTION <br />i <br />• Excess sludge is produced in <br />solids from the waste stream <br />( This sludge is wasted to the <br />I Prior to wasting, existing s <br />Page 3 <br />the system through removal of sewage <br />and growth of new cell material. <br />sludge holding tank periodically. <br />Ludge is settled in the holding tank <br />so that clear supernatant is displaced through the decant line <br />~ while sludge is being wasted. This permits concentration and <br />r <br />storage of waste sludge. When sludge concentration builds until <br />r no further settling occurs, the digested sludge is pumped out <br />I and can be disposed of on land, in a sanitary landfill, or at <br />a municipal sewage plant. <br />The clarified effluent is normally disinfected with chlorine to <br />32stroy the pathogenic bacteria, making it suitable for discharge <br />~` • into an appropriate receiving stream. The chlorine contact chamber <br />'~. <br />r is designed using a combination of plug flow and baffling to elimi- <br />nate short circuiting. Chlorine may either be gaseous or liquid <br />i hypochlorite, and the chlorine feed water supply can either be <br />r fresn water or plant effluent. <br />1_ <br />f__ <br />I_ <br />i • <br />I- <br /> <br />