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• <br /> l <br /> • 032 <br /> I <br /> • Pressurized Alternative <br /> Wastewater <br /> a <br /> Systems <br /> • <br /> (Septic Tank Effluent Pumping) <br /> _ <br /> • <br /> FULFILLING A NEED <br /> CONCEPT DEFINITION <br /> p One of the most difficult problems Although many sanitary consulting <br /> for today's individual home builder engineers have had some ex- <br /> 0 and residential developers is finding perience with pressure sewers, there <br /> available land for building homes are others who have had little exposure <br /> that will readily lend itself to sewage to the concept. Therefore, as a start, <br /> disposal either by on-site systems let's define a pressure sewer system. <br /> or! land for development elopment price <br /> as become A pressure sewer is sometimes <br /> so expensive in many areas that become described as a potable water system <br /> ! has forced the individual builder and in reverse. By this, we mean a water <br /> the residential developers to build system will hand one inlet r of end <br /> II on what is referred to as u nation point and a number of end <br /> land. These areas to can be undesirable esnormally r l user connections, while a pressure <br /> described as rocky, contain majr sewer will normally have a pressuriz- <br /> 1 elevation differences and may have ed inlet point at each end user con- <br /> high water tables. In addition, soil nection and one discharge outlet at <br />-� high water to many areas of the a treatment plant or discharge point. <br /> United States do not lend themselves The number of end user connections <br /> could be anywhere from a few to <br /> to on-site treatment systems. <br /> several thousand. <br /> It is universally recognized that there A pressure sewer system is made up <br /> 4 is a major need for a more econom- of three major segments.They are: <br /> ical method of collecting, transport- A. Pump package system (basin, <br /> i ing and treating sewage other than pump piping, controls, control <br /> gravity sewers.This would be espec- panel,alarm) - <br /> sally true in areas containing rock, B. Servce lines and force mains <br /> rough terrain, sparsely settled and C. Discharge treatment point <br /> high water table areas. <br /> There are two primary types of _ <br /> One of the most viable alternatives - pumps used in pressure sewers. <br /> One is referred <br /> d to gravity sewers'that has gained a the o to as a (fluent pump <br /> (GP) and the o <br /> great deal of attention over the past to an eiuen pump <br /> I several years is the concept of prey- (STEP) which is located in or behind <br /> sure sewer systems.There have been aseptic tank pump types The major difference <br /> over 150 of these systems (100-1500 between the two. is how <br /> I connections) installed since 1970 the solids are handled. <br /> - with a large number currently under In the case of GP units, the solids <br />, evaluation, design, or installation. <br /> - Pressure sewers under the US-EPA are ground into a ointry and pumped <br /> grants program are defined as alter- p a discharge point. With a STEP <br /> native systems, but not innovative pump. the settleable solids and <br /> since their performance and reli most of the grease accumulation <br /> ability has been proven in over 14 _ *amain in the septic tank. Conse- - <br /> years of operation- Quentiy, the STEP pump conveys a. <br /> fairly clear effluent to the discharge <br /> • <br /> point. - - <br /> cFtAIG B.MOaGAN AND ASSOCIA7lS,P.A <br />