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a 11tir)11 582 ' Happy Hollow R.J. Suite i f3 <br /> C <br /> ontrol <br /> Milford 011 -x`,17()-1831) <br /> mA I Tel: (513) 831-1165 Fax. (513) 965-48 <br /> __. e > � :. E-mail: P(-)lC011SVsCr.''aoLCo1T1 <br /> w,w.Pol I u tic,n Control Snvstem.con7 <br /> Introduction to your new PCS <br /> Wastewater Packaged Treatment Plant <br /> How the System Operates <br /> Many years ago it was discovered that a conventional municipal size activated sludge <br /> sewage plant, under certain conditions of low loading, could be operated without <br /> utilizing all the various and expensive components normally required for operation. The <br /> discovery, after many years of demonstration and exhaustive testing by the State of <br /> Ohio, led to the development of the economically priced, simple and easy to operate <br /> "Extended Aeration" type process, sometime referred to as aerobic digestion. This <br /> package wastewater treatment plant uses this type of treatment process. <br /> In sewage there are two types of solids- organic and inorganic. Inorganic solids will not <br /> decompose or break down. The PCS system is not designed to treat this type of waste; <br /> therefore they will either go through the system and discharge through the effluent <br /> outlet or be held in the system to be removed either mechanically or manually. The <br /> inorganic solids content in most wastes is small however, and with the exception of <br /> sand and gravel, should not cause trouble. <br /> Organic, solids will break down or decompose. Bacteria use the organic chemicals in <br /> the solids as food and actually do the work of breaking the chemicals down. Just like <br /> the cells in our body, the bacteria need oxygen to live and grow. If enough oxygen and <br /> enough food are present, the bacteria will live ideally. <br /> In the PCS system, the sewage is purified by the destruction of the organic compounds <br /> by using aeration to oxidize the volatile material into gas, water and sludge. Continued <br /> aeration of highly concentrated solids produces additional organisms that break down <br /> their own and other dead cell matter into water, carbon dioxide and ash. The resulting <br /> effluent is clear and odorless. Generally speaking our treatment plants will remove <br /> approximately 85% to 90% of the BOD (Biochemical Oxygen Demand) and suspended <br /> solids when properly operated and maintained. BOD refers to the amount of oxygen <br /> that is used by the living biological organisms in the oxidation of the organic matter in <br /> the waste <br /> The extended aeration process of sewage treatment consists of three basic operations: <br /> they are screening, aeration and settling. <br /> 1. Screening <br /> Before the sewage enters into the plant, it passes through one or more screening <br /> devices. There are three basic types of screening devices, which are: <br /> Pcs-0&Ni-intro-1-3 <br />