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• <br />process used makes a difference in the odor levels. Incorporating <br />biosolids by plowing or disking it into the soil further reduces odors. <br />How Are Biosolids Treated? <br />Wastewater treatment plants treat biosolids to reduce or eliminate <br />harmful microorganisms called pathogens. As required by both EPA and <br />the Colorado Department of Public Health and Environment, wastewater <br />treatment plants must treat biosolids to reduce pathogens and to stabi- <br />lize the biosolids by reducing the odors and that attract insects and <br />animals (called "vectors") before the material can be reused. <br />Wastewater Treatment Process <br />?r?;?r.?:.,?t?-r r•??m 'nr??.??n??;, rr,? ;??,?Fr•1 <br />rr <br />POffwy Trmeatment <br />i <br />• <br />r] <br />-• ?r - Iv?w?..??. tiDAK? :af <br />(paw <br /> <br />F?mar?l j -- _ <br />`? - ''I ?tflSO?IdS <br />_ <br /> Natural <br /> Soil <br />'?- Amendment <br />In Colorado, aerobic (with air) digestion and anaerobic (without air) <br />digestion are the most common methods for treating biosolids. Diges- <br />tion creates an environment that kills pathogens through heat and by <br />reducing the microbial food source. In addition, some facilities compost <br />their biosolids. The heat and microbial action of the composting process <br />kill pathogens and stabilize the biosolids even more. <br />How Can the Public Be Sure Biosolids Are Used <br />Safely? <br />The Colorado Department of Public Health and Environment regu- <br />lates biosolids to ensure correct and safe use. Regulatory compliance