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i i 1.0 PROCESS DESCRIPTION I The Clearwater Model CWW-450 wastewater treatment plant utilizes-both aerobic and anaerobic processes to achieve treatment. The aerobic process involves an attached growth system, while the anaerobic process is accomplished in a submerged filter, which also acts primarily as a fixed film system. . . . . In attached growth systems, microorganisms growing on a media remove soluble contaminants from the wastewater, using them as a source of energy for growth and-production of.new is'circulated through the media to provide contact with the microorganisms. The wastewater organisms. As new organisms form, the biological growth slowly becomes thicker, resulting in anoxic conditions near the media. As the mass builds, the adhesion to the media is weakened and the upper layers periodically slough off, exposing new media on which aerobic growth continues. The accumulation of the biomass on the surface also provides for entrapment of organic solids, which are attacked by extracellular enzymes that.solubilize the solids to make them available to the microorganisms as a food source. The conversion of the organic matter from soluble to biological solids allows for removal of the organic matter.'' The anaerobic process is designed to provide for both digestion of organic matter introduced into the filter and for conversion of nitrate nitrogen into nitrogen gas, or denitrification. The submerged filter provides an environment for development of a diverse bacterial population that provides for solubilization of organic matter in the wastewater and for denitrification of the nitrates produced during the aerobic treatment process. The organic matter in the wastewater provides the necessary carbon source for the denitrifying bacteria. F 2.0 PERFORMANCE EVALUATION i 2.1 Description of Plant Evaluated stem tested in this evaluation has a rated capacity The Clearwater Model CWW-450 treatment sy of 450 gallons per day (gpd)• Plant specifications and drawings are included in Appendix A. atment tank;.which provides for primary settling, followed by The system is made up of a pretre the attached growth and anaerobic filter systems. the Clearwater treatment tank, which houses 000 gallon septic tank, with baffles at the 'inlet and outlet. A pump The pretreatment tank is a 1, ; in the Clearwater tank provides for recirculation of sludge sloughed from the attached growth media to the building side of the pretreatment tank. This recirculation of sludge provides for i removal and digestion of the sludge, and provides food to the-attached growth system during water periods of non-use by establishing a recirculation heosubmeop �ued gravgh the el filter located ient tank. n thelower from the pretreatment tank is discharged g portion of the tank. The lower 40 inches of the Clearwater tank is always submerged and is devoted to anaerobic treatment. The anaerobic filter is made up of three courses of gravel, ranging from %" round 1 Draft Report