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Technical Description which have absolutely no disinfecting power. For this reason, it is very important that if chlorine is to be used, the chlorine receiving effluent be of the highest quality possible. Although the Bio-Pure system will be producing this high-quality nitrified/denitrified effluent at the disinfection contact stage, 7H recommends the use of ozone as the preferred method of disin- fection. Should chlorine be required by local ordinance, it is advisable that an ozone generator fol- low chlorine contact. This will accomplish two things: In virtually all cases it will assure a 99.999% pathogen kill and, at the same time, will convert the chlorine residual to a chlorate which will be taken up by plant life without harm. This conversion is expressed as: 3C1-+ 03 --> 3C1+3 02 ---> C1+3 03 After the SNT pump transfers the treated effluent from the clarifier, the clarifier sludge return (SLR) pump returns the sludge, and most floatables which surfaced during the clarification stage, to the aeration chamber for reprocessing. This sludge, along with the fresh incoming waste, be- comes the food source for new cell growth and a carbon source for denitrification. This 100% returned-sludge process configuration contributes greatly, to the Bio-Pure system's capability of removing an average of 96.4% of Total Nitrogen. (detailed later in this description) The 100% returned activated sludge (RAS) provides dead bacterial cells as the carbon source for new cell growth. The dead cells also provide a food source for the incoming bacteria. Upon com- pletion of the sludge return, the MLT pump can again fill the clarifier. Upon completion of the second 20-minute quiescent settling period in the ozone contact chamber, 95% of the effluent is pumped through dual multimedia pressure filters and on to final discharge. The remaining 5% in the ozone chamber is then pumped back to the headworks of the aeration chamber. During the filter backwash, all biomass is transferred to the aeration chamber headworks and processed as incoming waste. If physical pretreatment is incorporated in a buffer tank, settled sludge and backwash may be selectively returned to the buffer tank or to the aeration chamber. PHYSICAL PRETREATMENT, SEPARATION AND NITRIFICATION INITIATION (NOTE: The following may not be required for nitrification where detention periods of 14 hours or more are anticipated. With reduced solids concentration, the normal calculated aeration de- mand for the batch process is sufficient for nitrification supplementation. Should external nitrifica- tion be deemed necessary, the following procedure is used.) Prior to entering the treatment plant, raw sewage may be collected in a baffled buffer tank. The buffer tank is anaerobic and sized for a detention period that will allow solid/liquid separation, retention of solids and floatable materials, and promotion of facultative anaerobes by degeneration of natural dissolved oxygen levels. The tank inlet and outlet are level and partially baffled, causing retention of a portion of the solids. This retention allows the microorganisms to develop large colonies. This simple collection of sol- ids reduces overall loading to the aeration reactor and hastens the process of converting organic nitrogen to ammonium ions. It also supplies soluble BOD as effluent product/influent wastewater to the aeration tank. The lowering of BOD levels in the aeration reactor forces depletion of available BOD food source in the extended aeration phase. This enhances the natural dominance of nitrosomonas and nitro- 8