Presentation on theme: "WSNTG Annual Conference September 2006 Water Services National Training Group 10 th Annual Conference 7 th September 2006."— Presentation transcript:
WSNTG Annual Conference September 2006 Water Services National Training Group 10 th Annual Conference 7 th September 2006
WSNTG Annual Conference September 2006 Alternative Wastewater Systems - Technical Aspects: S.T.E.D.S. Geoff Salthouse Project Engineer Orenco Systems ®, Inc. (U.S.)
WSNTG Annual Conference September 2006 Presentation Outline Introduction Brief History of the Technology Orenco ® Effluent Sewer Overview Secondary Treatment Overview Collection and Treatment System Costs
WSNTG Annual Conference September 2006 Orenco Systems ®, Inc. Established in 1981 About 300 Employees Designers and manufacturers of decentralized wastewater technologies for individual properties and small communities –Injection-molded fiberglass tanks –Effluent pumping and filtration systems –Community collection systems –Advanced treatment systems –Monitoring and control devices
WSNTG Annual Conference September 2006 History of Effluent Sewers “If there is not enough fall to give a self-cleaning velocity in the main drain, it will sometimes be possible to put in a septic tank at the head of it. The effluent from a septic tank, being free from any solids capable of choking a drain, may safely be laid with a merely nominal fall.” -- A. J. Martin The Work of the Sanitary Engineer London, 1935
WSNTG Annual Conference September 2006 History of Effluent Sewers 1960: Zambia* 1962: Australia** –STED (septic tank effluent disposal) systems developed Simple oxidation lagoons provide secondary treatment Reuse developed, using small extended aeration plants Over 110,000 people in S. Australia served by STEDs 1964: Nigeria* * The Design of Small Bore Sewer Systems, 1985. ** EPA Alternative Wastewater Collection Systems Manual, October 1991.
WSNTG Annual Conference September 2006 History of Effluent Sewers
WSNTG Annual Conference September 2006 History of Effluent Sewers
WSNTG Annual Conference September 2006 What are Effluent Sewers? An alternative to conventional gravity sewer The collection and transportation of wastewater to a treatment site –Usually associated with decentralized treatment –Can be integrated into an existing conventional gravity sewer
WSNTG Annual Conference September 2006 Effluent vs Gravity Sewer
WSNTG Annual Conference September 2006 Effluent Sewers in the U.S.
WSNTG Annual Conference September 2006 Effluent Sewer Supported In 1997, the USEPA submitted a Response to Congress on Use of Decentralized Wastewater Treatment Systems An excerpt from the EPA’s Executive Summary: Adequately managed decentralized wastewater systems are a cost-effective and long-term option for meeting public health and water quality goals...
WSNTG Annual Conference September 2006 Effluent Sewer Overview
WSNTG Annual Conference September 2006 Shallow burial depth Laid to contour of land No minimum velocities No oversized designs Low operation and maintenance costs Odor control necessary in certain applications Effluent Sewer Overview
WSNTG Annual Conference September 2006 Septic Tank Effluent Pumping Septic Tank Effluent Gravity Orenco Effluent Sewers
WSNTG Annual Conference September 2006 Orenco Effluent Sewers Orenco Effluent Sewers –25 years of documented system performance in Glide, Oregon; 900 connections Regional examples: –North: SW Barry County, Michigan; 1000+ Strathcona, Alberta; 300 –West: Missoula, Montana; 2500 Penn Valley, California; 240 –South: Ariton, Alabama; 340
WSNTG Annual Conference September 2006 Primary treatment in interceptor tanks 4000-litre tank per residence 70% removal of fats, oils, and greases 24-hour emergency storage 12-year pumpout with 95% confidence Abuses stay in interceptor tank Chemical sources easier to identify Orenco Effluent Sewers
WSNTG Annual Conference September 2006 Effluent Pump Non-corroding stainless steel Designed for wastewater Lightweight; under 14 kg Long life; 20 to 30 years Orenco Effluent Sewers
WSNTG Annual Conference September 2006 VeriComm allows for 24/7 supervision with remote monitoring Operation and maintenance is simplified Standard panel without telemetry is available Orenco Effluent Sewers
WSNTG Annual Conference September 2006 Flexible in design –Adaptable to varying site conditions –Allows for phased buildout –Can be integrated into existing sewer infrastructure Design includes storage/reserve in the event of power outages or need to repair mainline break Low-impact construction –Minimal disruption to community Effluent Sewer Advantages
WSNTG Annual Conference September 2006 Quality of Treatment The ONLY collection technology that provides treatment –70 to 90% reduction in waste strength Collection and treatment technology integration –Reduced hydraulic and biological loading to treatment facility
WSNTG Annual Conference September 2006 Secondary Treatment Packed Bed Filter - Attached Growth Process Highly stable, reliable Uses fixed film media Operates in an unsaturated condition (not submerged) Employs intermittent dosing Uses filtration and biological/chemical reduction Produces a net reduction in cellular mass due to endogenous respiration –Little or no sloughing –Minimal solids accumulation
WSNTG Annual Conference September 2006 AdvanTex ® Treatment Packed bed filter Engineered textile material Appropriate tankage and timed dosing Complete, pre- manufactured package
WSNTG Annual Conference September 2006 Attached Growth Aerobic microbes attach and grow on media Wastewater flows across a zoogleal film created by microbes Microbes extract and digest soluble organic matter from the wastewater
WSNTG Annual Conference September 2006 Installed Cost: €2700 - €3500 Building sewer Interceptor tank, risers and lids ProSTEP™ pump package Control panel Electrical conduit & wire Electrical power to controls Service line Orenco STEP Cost
WSNTG Annual Conference September 2006 On-Lot O&M Costs STEP systems –Annual power consumption: €10 –Inspection and monitoring: €25 per year –Inspections conducted: every other year STEG systems –Annual power consumption: €0 –Inspection and monitoring: €16 per year –Inspections conducted: every other year Tank pumpout (10 to 12 year intervals)
WSNTG Annual Conference September 2006 Collection System Typical Installed Costs ItemCost Collection pipe (50 - 150 mm) € 15 - € 40 per metre Air release assembly € 250 - € 500 each Pigging port assembly € 400± each Cleanout assembly € 120± each Crossings (stream/RR) € 400± per metre
WSNTG Annual Conference September 2006 Treatment System Costs Treatment system installation –€0.83 to €2.10 per treated cubic metre Includes engineering, permitting, and construction O&M costs –Approximately €10/month/cubic metre
WSNTG Annual Conference September 2006 Initial vs. Deferred Costs
WSNTG Annual Conference September 2006 Summary Effluent Sewers are: –Affordable Low Installation, Operating, and Maintenance Costs –Effective Provide Consistent Primary Treatment Reduce Treatment Plant Size –Proven Hundreds of Installed Systems –Versatile Designed for Specific Applications
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