Terragon Environmental Technologies Inc. is pleased to report that after 6 months of testing, its WETT-G technology has been found to conform to the performance requirements of the NSF/ANSI 350 standard for greywater treatment for onsite residential and commercial water reuse. Four international plumbing and building codes now require that water reuse systems comply with NSF International’s standard for water reuse systems.
Typically, greywater is defined as the wastewater generated by showers, baths, laundry and bathroom sinks; it does not include toilet or urinal wastewater, or water from kitchen sinks and dishwashers. Residential greywater contains important concentrations of detergent, soaps, suspended particles, organic compounds, oils, nitrogen, phosphorus, and pathogens. Greywater treated to the NSF/ANSI 350 standard can be used for non-potable activities, such as toilet flushing, laundry and unrestricted irrigation.
The WETT-G testing was carried out by the Centre des technologies de l’eau (CTE), associated with the CEGEP de Saint-Laurent in Montréal. The WETT-G system was installed in the CEGEP and used to treat greywater generated from the sports complex showers as well as a laundry machine used to wash sports team uniforms. The system was operated continuously over a period of 6 months (September 2017 to March 2018) during weekdays.
The treated effluent generated was found to meet NSF/ANSI 350 requirements at all times, with good durability and stability in terms of equipment and treatment performance. Unlike many greywater treatment systems, WETT-G was shown to be capable of treating the more concentrated greywater produced by laundry activities, as well as mixtures of laundry and shower greywater. The clear colorless treated effluent was used to provide toilet flush water; due to its disinfection and the presence of a small oxidation residual, no biofilm was created in the toilet tank over the study period.
The unique and innovative WETT-G is based on a proprietary and patented electrocoagulation unit, a turbidity removal unit, a polishing stage, and a disinfection unit. WETT-G is entirely electrochemical and does not depend on biological treatment, chemical addition, chlorine pucks, UV disinfection, filters, or membranes. It is an automated system that generates all that is required for treatment in-situ, without operator attendance. The system has low maintenance requirements, and can be remotely monitored. As well, the system automatically starts and stops, depending on whether or not greywater is available for treatment, and can be programmed to operate during selected time periods as desired.
WETT-G is available in capacities and sizes suitable for residential homes (1.4 m3/day or multiples of this value), as well as in capacities that are required for commercial, government, or multi-occupancy buildings (7.2 m3/day or multiples of this value).
Greywater treatment is of interest in regions with a high cost of water or with water scarcity; it is also of interest in buildings which need to significantly reduce or eliminate wastewater discharges to the environment. Greywater recycling reduces the volume of potable water required and consequently the volume of wastewater generated. As well, greywater treatment and reuse is an aspect of green sustainable buildings and is a component of the LEED (Leadership in Energy and Environmental Design) and BOMA (Building Owners and Managers Association) BEST green certification programs.
Please contact Terragon and we will be pleased to discuss how WETT-G can best be used in your project.