On-Site_07_FINAL_PAPER.pdf - R.M.C Patterson e-mail...

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R.M.C Patterson, e-mail [email protected] and A.C. Gatley, e-mail [email protected] SEVERELY LIMITED SIT ES NEED „EVAPOCYCLE‟ TECHNOLOGY, A SUPER EFFICIENT EVAPORATIVE OSMS PART A. EVAPOCYCLE TM ( Patented design ) R.M.C. Patterson (Environmental Consultant), [email protected] ABSTRACT On-site wastewater management on severely limited sites is difficult. Used with primary wastewater treatment systems the small footprint Evapocycle is proven to significantly reduce pathogens while applying zero, or very little, hydraulic loading on land application systems. The system has modest capital, maintenance and operating costs. Evapocycle, a pressure dosed ETA/mound hybrid system, was originally development at the Centre for Environmental Studies at the University of Tasmania, it complies with AS/NZS 1547:2000 as an alternative system. Since 1996 „Evapocycles‟ have operated on a number of commercial and domestic sites throughout Tasmania and Adelaide. An “energy input/sequestered carbon” budget is included to determine CO 2e credits that may be available to developers to offset energy costs. LGAs and other authorities classifying this technology as an agreed system for projects on areas requiring special management techniques may also benefit from greenhouse credits. Key Words: hybrid system, hydraulic load, maintenance, pathogens, carbon trading, sequestered carbon, greenhouse gas, audit 1 INTRODUCTION There is an increasing trend to use on-site wastewater treatment and disposal systems away from centralised sewerage treatment systems having resulted from many factors including availability (to connect), cost and more recently an increasingly poor performances of sewage treatment plants (resulting in large scale pollution and environmental degradation). The performance requirements for on-site wastewater treatment and disposal treatment systems are identified in Australian/New Zealand Standard (AS/NZS) 1547:2000. On-site domestic-wastewater management. AS/NZS 1547:2000 defines various means of compliance for land application systems (conventional ground absorption trenches and evapotranspiration systems), waste-water treatment units (Aerobic Wastewater Treatment Systems (AWTS)) and other wastewater systems such as „„ EVAPOCYCLE ‟‟. Historically, land application systems (formally known as basic septic tank systems using conventional in- ground absorption trenches) were generally restricted to building lots of sufficient size with no site limitations such as non-absorbent soil types, high ground water tables, rock and steep slopes as identified in the Australian Standard. The early 1980‟s saw the introduction of the AWTS in Tasmanian and a number of mainland states. AWTS were originally designed to fit into large wastewater holding tanks that were pumped out on a regular basis into road tankers for transport to sewerage treatment plants. AWTS produced chlorinated wastewater that was approved for surface disposal onto prescribed garden beds. AWTS solved the high cost associated with the use of pump out road tankers however, other problems with the wide spread use
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R.M.C Patterson, e-mail [email protected] and A.C. Gatley, e-mail [email protected]
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  • Fall '04
  • CharlesLadd

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