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TOWA Insider - Texas Onsite Wastewater Association

TOWA Insider - Texas Onsite Wastewater Association

TOWA Insider - Texas Onsite Wastewater

TOWA Insider The Official Texas On-Site Wastewater Association Publication Volume 13 - Number 3 - 3rd Issue 2006 In This Issue: President’s Message Jeff Snowden-Austin, TX NSF Listed Treatment Units, ONLY for Residential! President’s Message.............. TOWA Board of Directors....... 2006 Corporate Partners........ 5 Executive Director’s Report.... 5 Legal Counsel Update............ 7 TOWA Calendar of Events..... Local Chapter Contacts.......... 9 Fall Superconference Recap.. 11 Board Nominations Form....... 13 High Strength Designs........... 15 New TOWA Staff.................... 15 TOWA-PAC Form................... 19 Basic Maintenance Courses.. 19 Annual Waco Exhibit Info....... 21 Basic ATU Requirements....... 23 www.txowa.org 512-494-1125 1 3 9 With increasing frequency, people are asking how to use NSF-listed home plants for offi ce, restaurant, or other nonresidential applications. Based on the last several years of experience, I now have come to the opinion that at no time should any NSF-listed home plant be used on anything other than residential strength wastewater. There are two basic reasons for this opinion. The fi rst reason is that nonresidential applications usually generate wastewater of higher strength and higher solids content than residential wastewater. The treatment capacity of these home plants is insuffi cient to handle higher strength wastewater. Further, the pretreatment and treatment capacity of these home plants is not intended to handle the higher solids content. The second reason is that many nonresidential applications have other wastewater strength parameters that are also outside the treatment capacities of these home plants. Restaurants, for example, have high fats, oils and grease (FOG) content, high levels of undigested foods, high levels of toxic products, as well as often having high temperature wastewater. I don’t believe that any home plant is intended to treat this type of wastewater. It is my opinion that the only way a home plant can be used correctly on a nonresidential strength wastewater application is if the wastewater is fi rst pretreated by a product or process specifi cally designed for the high strength constituent. If the wastewater is pretreated to reduce the strength to a residential strength, then, and only then, can a home be used correctly. The following is a listing of quotes that seem to support our opinion for only using home plants for residential applications. NSF Standard 40: Residential Wastewater Treatment Systems 1.1 Purpose: The purpose of this Standard is to establish minimum materials, design and construction, and performance requirements for residential wastewater treatment systems. 1.2 Scope: This standard contains minimum requirements for residential wastewater treatment systems having simple, defi ned discharge points and rated treatment capacities between 1514 L/day (400 gal/day) and 5678 L/ day (1500 gal/day). 3.6 Residential Wastewater: Human body waste and liquid waste generated by the occupants of an individual residence.” 3.7 Residential Wastewater Treatment System: An organized and coordinated system of components that functions to treat wastewater generated by individual residences. 30TAC285: Since the promulgation of these rules in February 1997, Table III has stated, “Commercial / institutional facilities (continued on page 3)

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