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Equalisation guide COMMONWEALTH OF MASSACHUSETTS EXECUTIVE OFFICE OF ENVIRONMENTAL AFFAIRS DEPARTMENT OF ENVIRONMENTAL PROTECTION ONE WINTER STREET BOSTON MA - - JANE SWIFT Governor BOB DURAND Secretary LAUREN A LISS Commissioner TITLE RECIRCULATING SAND

COMMONWEALTH OF MASSACHUSETTS EXECUTIVE OFFICE OF ENVIRONMENTAL AFFAIRS DEPARTMENT OF ENVIRONMENTAL PROTECTION ONE WINTER STREET BOSTON MA - - JANE SWIFT Governor BOB DURAND Secretary LAUREN A LISS Commissioner TITLE RECIRCULATING SAND FILTERS DESIGN GUIDANCE E ?ective Date June updated April Policy BRP BWP WPeP G - Program Applicability BRP DWM Watershed Permitting Title Program Supersedes Recirculating Sand Filters RSF Design Guide Regulation Reference CMR Approved By signed Cynthia Giles Assistant Commissioner Bureau of Resource Protection I PURPOSE This document has been prepared by the Department of Environmental Protection to serve as a guide to the design of ??Recirculating Sand Filters ? RSF This is not intended to be a comprehensive design manual nor is it intended to restrict professional judgment in the design but rather re ects accepted design criteria for a typical RSF This guidance also does not apply to proprietary sand ?lter systems with certi ?cations or approvals from the Department Deviations from the design guidelines presented in this document can be allowed by DEP if scienti ?cally and technically valid The design criteria described herein generally apply to larger systems i e greater than gallons per day Accordingly changes in the design parameters may be necessary and desirable when designing for smaller systems II INTRODUCTION In recent years a variety of environmental economic and technological factors have conjoined to make enhanced treatment of sanitary sewage a viable alternative to the conventional on-site septic tank and soil absorption system These alternative systems can treat sanitary sewage to produce e uent meeting or bettering secondary standards of milligrams per liter mg L biochemical oxygen demand BOD and mg L total suspended solids TSS In addition some of these systems will nitrify and denitrify to Printed on Recycled Paper This information is available in alternate format by calling our ADA Coordinator at - DEP on the World Wide Web http www state ma us dep CTITLE RECIRCULATING SAND FILTER DESIGN GUIDANCE produce an e uent with a total nitrogen concentration of mg L or less While many enhanced treatment systems rely on proprietary technology the RSF can provide a nonproprietary enhanced treatment alternative Title CMR requires the use of RSF or equivalent alternative technology for facilities with design ows from to less than gallons per day GPD when located in nitrogen sensitive areas RSF are Certi ?ed for General Use for enhanced nitrogen removal and approved for Remedial Use under Title ? s approval process for alternative systems CMR et seq Title recognizes the denitrifying capability of the RSF For facilities with a design ow up to GPD CMR allows an increase in wastewater loading to GPD per acre with the use of an RSF or equivalent alternative technology III PROCESS SUMMARY A typical RSF system consists of a septic tank may include an equalization tank prior to the recirculation tank and a sand ?lter followed by a soil absorption system SAS The septic tank provides primary treatment for the in uent The septic tank e uent may ?rst