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4 1:0 PROCESS DESCRIPTION The Mic oSepTec EnviloServer 600 uses primary clarification, biological secondary treatment, clarification and.chlorination processes to achieve treatment. z In the primary clarifier chamber readily settleable solids (primary sludge), which are suspended in the infiluent:raw sewage, settle to the bottom of ft tank. The clarified sewage flows through to the aerated reactor chambers. 4 In the aerated reactor chambers, microorganisms remove soluble and non-readily settleable particulate contaminants from the clarifleOisewage,utilizing them ae a source of energy for growth and production of new microorganisms. The organisms tend to be flocculerttend form clumps, or floc, that physically entrap particulateorganic matter. The organic matter is attacked by extracellular enzymes that solubilize the solids to rrtake..Own available to the-.rnicxoorganisms as a food.source. The conversion of the organic matter from ll sgluble to biological sol* aows for removal;of the organic matter by nettling of the solids in the treatment process. The microorganisms primarily retspensible for the degradation of the organic matt'are aerobic bacteria. As such, the transfer-of.oxygen into the wastewater by an aeration.system is critical to the treatment process. The aeration.,system:-also-provides for the'mbdhg:of 1he wastewater and organisms to provide contact between the organic contaminants in the wastewater and thevrganisnis that provide for removal of the contaminants. Interruption of the aeration system for a long period of time, such as a day or more, can,have e serious Impact on,the process. The:EnviroServer 600 uses a\h id-#.e.fixed-film and suspended growth) moving bed bloreactor process to provide biological treatment.;Mkrdonganisms are gr Mon plastic cylinders(fixed growth)which Lfloat in a mixed liquid medium. "croorganiisms also grow in the liquid medium, forming flocs and clumps as described above (suspended growth). Excess microorganisms are produced regularly in a biological wastewater treatment process. Wastewater from the aerated reactor chambers enters a:secondary darifier.chamber, vVhere quiescent conditions allow the ,fnIcmorW,ism to ckuM vgether in targe enough pattidles that they settle to the bottom of the sex y clarifier chamber. This biomass, or sludge,-from the secondary clarifier is periodically pumped baric to the primary clarifier. 2.0 PERFORMANCE EVALUATION 2.1 Description of Plant Evaluated The EnviroServer 600 tested in this evaluation has a rated capacity of 600 U.S. gallons per day (gpd). Specifications and drawings are included in Appendix A. The tank is constructed of fiberglass. z The primary clarfier chamber(320 gallon working volume)removes readily settimble solids from the influent raw sewage Oy gravity settling,and also.removes biosolids(waste bactb€ia)fin waste activated sludge pumppd from the secondary clarifier chamber.-This regyde�strvam is dis#'tbfted at the bottom of the primary clarifier chamber and causes some intermittent mixing with primary sludge and waste activated sludge. The wastewater flows out the top of the primary clarifier chamber into the first aeration chamber. M This report may not be reproduced In whole or in part Page 7 of 49 Fired Report without the expressed written consent of NSF Intemational. April 2000