Beckwith Middle & Palmer River Elementary Campus – Rehoboth, MA
In 1996 the Dighton Rehoboth School District began supplying drinking water to the Palmer River Elementary School and the Beckwith Middle School, both located on the same campus in Rehoboth, MA, from an onsite water supply well. This technically placed the wastewater dispersal system into a nitrogen sensitive area as defined by the Massachusetts Department of Environmental Protection.
This meant that the wastewater treatment system had to denitrify the wastewater prior to disposal in a subsurface soil absorption system. At this time the District installed a Fixed Film Activated Sludge Treatment (FAST) system to provide nitrification (the biochemical conversion of organic nitrogen compounds to the inorganic form of Nitrate) of the wastewater in this aerobic treatment unit and attempted to denitrify (the biochemical reduction of Nitrate to Nitrogen gas) the wastewater by recycling the nitrified effluent from the aerobic treatment unit to an anoxic tank.
The system was never able to nitrify the wastewater which makes denitrification impossible since nitrification is required prior to denitrifying. This meant the system was not producing the effluent quality that was required by the Massachusetts Department of Environmental Protection. The District asked Wastewater Alternatives to evaluate the existing system and develop a plan of action to remediate the situation and bring the system into compliance with its permit.
We analyzed all of the operational parameters that affect the nitrification and denitrification processes. During this evaluation we determined that one of theprimary problems with the system was the lack of flow equalization and therefore, for the step in bring the system into compliance, we recommended the installation of a flow equalization basin. Wastewater Alternatives prepared design plans and specifications for the installation of a flow equalization basin and construction is slated to begin in February of 2008.
Once installed and the new flow regime takes effect, Wastewater Alternatives will begin testing the system for compliance and make minor system adjustments to bring this system into compliance with its permit.
Cambridge School of Weston - Weston, MA
Approximately half of the school facilities on The Cambridge School campus are connected to the Massachusetts Water Resource Authority’s (MWRA) sewer system that serves much of the Boston metropolitan area. Recently the school learned that their sewer system, constructed in the nineteen sixties through eighties, was never appropriately permitted.
Wastewater Alternatives provided the school with special permitting consulting services such as those required to bring their existing sewer system into compliance with MWRA regulations. We put an emphasis on the enlighten approach that the school has toward education and their ongoing involvement with the community and environment. We developed a report that outlined accurate wastewater flows now going to the MWRA sewer system and developed permitting fees from this at an approximate 30% savings from the initial MWRA estimate.
The situation was a difficult one considering the lack of historical documentation available to determine the status of specific permits for different legs of the CSW sewer. Wastewater Alternatives assembled and organized all existing documentation available and presented this in a report clarifying the situation allowing the permitting process to proceed to a fair and equitable conclusion for the Cambridge School.
Wastewater Alternatives, L.C. | 11 Russell Street | Plymouth MA 02360 | Phone: 508.747.1158 | Fax: 508.747.2892