Evapotranspiration bed system for the wastewater from scenic and environmentally sensitive areas

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Courtesy of IWA Publishing

The Onsite Wastewater Treatment (OWT), also commonly known as Septic Tank System, is supposedly to provide adequate treatment for individual private dwellings.  In reality, because of its poor efficiency and lack of sound engineering design, the OWT has become a modern façade to pollute the land and groundwater resource.  The evapotranspiration bed (ET-bed) system can effectively treat wastewater effluent from OWTs located in scenic and environmentally sensitive areas (e.g., Switzerland and City of Malibu).  When engineered appropriately, it is very effective to locations where space is very limited, when the site does not percolate, when setback between ground surface and groundwater table is less than 5 feet and should be installed in areas located near water bodies.

Introduction

The On-site Wastewater Treatment (OWT)  systems have been widely used to treat wastewater from individual residence and community facilities in unsewered area.  In many classic literatures, it is named as septic tank systems.  There are about 20 to 30% of the population in Europe and North America utilizing OWT for domestic wastewater disposal.  Whereas, there are 17 million housing units, or 1/3 of all housing units, dispose of domestic wastewater through the use of septic tank systems in the US.  It has become an open and means to pollute our landscape.

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