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<br />42 <br /> <br />. <br /> <br />. <br /> <br />Sewage j. though not a pleasant subj ect, is an important <br />problem for any city to solve. In Ft. Collins the 1974 <br />average amount of sewage produced was 11 million gallons a <br />day. The rapid growth of the city will continue to make <br />sewage disposal a problem. <br />The organic content of sewage decomposes readily with <br />the production of unpleasant odors. This makes the <br />collection and removal or treatment of sewage from <br />populated areas necessary. Another important factor is the <br />high bacterial content of the sewage and the presence of <br />pathogenic organisms such as those producing intestinal <br />diseases. If the sewage is to be discharged into a stream <br />acting as a source of water supply, these pathogenic <br />bacteria will be a public health menace. <br />Perhaps the most important of the chemical components <br />of sewage is its oxygen content. Oxygen in the water is <br />used up in the biochemical decomposition of unstable <br />matter in the sewage. The amount of oxygen required to <br />stabilize the oxidizable matter present is called the <br />biochemical oxygen demand (BOD). Discharge of water <br />having a high BOD content into a stream will subsequently <br />lower the dissolved oxygen content downstream. Low <br />dissolved oxygen content is detrimental to fish and other <br />aquatic life in the stream. Treatment of sewage removes much <br />of the BOD and pathogenic organisms present in raw sewage. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br />