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o .b..tion 582" 113ppti Hollow Rd. Suite (-13 <br /> cortrol Milford. 01-145150-1S30 <br /> Tel: (513) 831-11€5 Fax (513) 9654811 <br /> syst : . , 111CE-mail:y 1'c31 <br /> Cont <br /> (yCsc< <br /> lit i on <br /> Environmental Factors <br /> Environmental factors that affect the wastewater treatment process include <br /> temperature, precipitation, and winds. The wastewater temperature affects the activity <br /> of the microorganisms or bugs. During cold winter weather this reduced activity might <br /> lower the efficiency of the treatment system. Besides biological effects of temperature, <br /> the flocculation and sedimentation of the mixed liquor solids are not as effective at lower <br /> temperatures. Ice buildup will hinder or stop the proper operation of equipment such as <br /> skimmers, and floats switches. <br /> Precipitation over the area served by the treatment plant may cause the wastewater <br /> flow to increase due to the existence of combined sewers or due to infiltration into the <br /> sewer line. This is generally accompanied by a weaker wastewater in terms of <br /> Biochemical Oxygen Demand (BOD) due to the dilution effect of the storm-water. <br /> These occasions might cause the treatment system to be hydraulically overloaded. <br /> This results in a reduced time spent by the wastewater in the treatment system; thus, <br /> treatment efficiency is reduced. <br /> Without plant modifications, there is not much the operator can do to offset the changes <br /> in treatment efficiency caused by temperature changes and high flows during storms. <br /> Frequent observation and removal can control any possible ice buildup during cold <br /> periods. Maintaining an even flow of wastewater through treatment system will help to <br /> prevent ice buildup. Diffused air systems will supply sufficient heat inside the building to <br /> prevent ice from forming on the clarifier. It normally will be necessary to vary the <br /> amount of sludge as season's change. Because the bugs are not as active in winter at <br /> low temperatures, than in summer, the Milligrams per Liter of Suspended Solids (MLSS) <br /> will need to be higher in the winter than in the summer. <br /> The major problem presented by winds could possibly be blowing debris, such as <br /> leaves, sticks, and paper from the surrounding area into the clarifier. This material <br /> could cause the pumps to plug. The operator should check the treatment plant <br /> following windstorms to verify that the equipment is operating properly. <br />