Rhode Island
Advantex® Treatment Systems
AX Series (AX20 & AX100) (click here for copy of approval)
A Prepackaged packed bed filter that significantly reduces BOD and TSS inside a water proof
container installed after a two compartment tank prior to discharge to a leach field which
may be reduced by 50%.
Approval Status: Class I - Advanced Treatment system
RX Series (RX30) (click here for copy of approval)
In a recirculation process (modes 3a or 3b) effluent is pumped to a prepackaged packed bed
filter of fibrous textile media inside a watertight container from a two compartment tank
prior to discharge to a leach field. The system significantly reduces BOD, TSS, and
Nitrogen and a 50% reduction in leach field size is allowed.
Approval Status: Class II - Nitrogen Reducing Treatment system
Recirculating Sand Filters (click here for Guidance Document)
Wastewater, having received primary treatment in a septic tank or equivalent, flows by gravity to a recirculation (mixing) tank. In doses controlled by both a programmable timer and float switch, the mixed fresh wastewater and partially treated filter effluent is applied to abed of coarse sand (fine gravel) media. This mixed wastewater is dispersed over the filter surface in a PVC distribution network surrounded in pea stone. Wastewater trickles down through the sand media, where biological treatment occurs. The treated effluent is collected in an underedrain at the bottom of the filter and discharged back to the recirculation tank. There most of it mixes with incoming wastewater, a small amount gets discharged to the drainfield, and the cycle begins again. Typically, a buoyant ball check valve is used to control discharge and recirculation. Treated wastewater is discharged to a drainfield for additional treatment. The system is capable of significantly reducing biological oxygen demand (BOD), total suspended solids (TSS), and total nitrogen in the effluent. The technology is targeted for use in critical resource areas and in intended to be used with shallow pressurized drainfields.
Intermittent (Single Pass) Sand Filters (click here for Guidance Document)
Wastewater, having received primary treatment in a septic tank or equivalent unit, is pressure dosed to a bed of specified sand media. Wastewater is applications to the filter surface are controlled by both a programmable timer and float switch. Wastewater is dispersed over the sand filter surface in a PVC pipe distribution network surrounded in pea stone. Wastewater trickles down in unsaturated thin film-flow through the sand media, where biological treatment occurs. The treated wastewater (sand filter effluent) is collected in an underdrain at the bottom of the filter and discharged by pressure to a shallow - narrow drainfield, where additional treatment occurs. The system is capable of significantly reducing biological oxygen demand (BOD), and total suspended solids (TSS).
Bottomless Sand Filters (click here for Guidance Document)
Wastewater, having received secondary or better treatment in advanced treatment unit(s), is intermittently pressure dosed using a programmable timer to a bed of specified sand media. Wastewater is dispersed over the bottomless sand filter surface in a PVC pipe distribution network surrounded in pea stone. Wastewater trickles down in unsaturated thin film-flow through sand media, where physical and biological treatment occurs. The small size of particle media promotes straining and subsequent removal of pathogenic organisms. The treated wastewater (bottomless sand filter effluent) infiltrates into the underlying native soil, where it may receive additional treatment as it percolates down through air-filled soil pore spaces, before entering the saturated zone.
Pressurized Shallow Narrow Drainfield (click here for Guidance Document)
Wastewater, having received secondary or better treatment in advanced treatment unit(s), is intermittently pressure dosed to a number of trenches, typically installed in the native material. Wastewater is dispersed over the soil trenches through a PVC pipe distribution network. This network consists of a pressurized lateral resting on supports that raise the lateral above the soil surface and support the 12"wide PVC dome cover during backfill. With 98% of the soil biota located within the top 16 inches of soil, dispersing the effluent close to the surface may further decrease the wastewater strength before it enters the groundwater.
OSI Screened Pump Vaults
The OSI screened pump vault is installed at the outlet end of a single or double compartment septic tank. The screened vault captures solids so that only liquid from the "clear zone" between the tank's scum and sludge layers is pumped. The OSI effluent filter is a polyethylene wastewater filter installed at the outlet of a septic tank to prevent solids from passing to the drain field.
Approval Status: Class I - Effluent Filter and Pump Vault Filter
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