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Technical Description ess, the levels of ammonia at the chlorine contact stage will be high enough to convert the potent chlorine to a less-than-potent monochloramine. In addition to combining with ammonia, hypochlorous acid reacts with amino acids, proteins, and other organic matter to produce chlorine compounds which have very low disinfecting power, and it combines with sulfites, nitrates, and ferrous or manganous ions to produce chlorine compounds 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 Nitro-Raptor system is perfectly capable of producing this high-quality effluent at the chlorine contact stage, 7H recommends the use of ozone as the preferred method of disinfec- tion. 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: 3CI-+03 3C14'302 Cl*503 After the SNT pump transfers the supernatant 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, becomes ii the food source for new cell growth and a carbon source for denitrification. Because of this 100% returned-sludge process, the Nitro-Raptor system is capable of removing an average of 96.4% of nitrates. The 100%returned activated sludge (RAS) provides dead bacte- rial cells as the carbon source for new cell growth.These new cells utilize the NOs along with the PO4, causing removal of nitrates and phosphorus. The dead cells also provide a food source for - the incoming bacteria. Upon completion 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 cham- ber, 95% of the effluent is pumped through dual multimedia pressure filters and on to final dis- charge. 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 head- works 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 i chamber. ADDITIONAL PRETREATMENT(may not be required) DISINTEGRATION.If required, influent may be disintegrated by pretreatment prior to entering the aeration chamber by one of three methods: 1. A static screen is mounted in a system preceding buffer tank. As the raw waste stream flows into the screen foreign articles are captured and fall to the bottom. Sewage waste passes through the screen directly into the buffer tank. This screen must be cleaned periodically. 2. The mixing action in the buffer tank, caused by the introduction of forced air, reduces the size of all incoming matter prior to its being pumped into the aeration chamber. _g_ 7-H Technical Services Group,Inc. I I