Description of Technology

SeptiTech Models 400, 550, 750, 1200, 1500, 3000 and SeptiTech Engineered Systems

The SeptiTech System is a Secondary Treatment Unit (STU), that uses an enhanced recirculating biological trickling filter to remove biochemical oxygen demand (BOD5) and total suspended solids (TSS) from wastewater. The System utilizes a hydrophobic media, composed of polystyrene beads or polystyrene beads and solid media, in a two-stage process where biological growth occurs within the media pore spaces. Models 400 through 750 are installed in high-density polyethylene (HDPE) or concrete tanks. Models 1200 through 3000 are installed in concrete tanks. A programmable logic controller (PLC) controls the treatment process by continuously monitoring incoming flows and adjusting the treatment process (recirculation, sludge return and discharge cycles). Details of this process are as follows:

 Wastewater from the septic tank enters the treatment tank and collects in a reservoir at the base of the tank where it mixes with treated wastewater,

 A recirculation pump controlled by the PLC pumps the wastewater to the treatment area at the top of the tank where air is drawn into the wastewater,

 The aerated wastewater is sprayed over the hydrophobic media which is suspended above reservoir, wastewater trickles through the media and returns to the reservoir,

 Wastewater is circulated over the media 70 or more times per day,

 Solids in the reservoir are periodically returned to the septic tank, and

 The PLC activates the recirculation, return sludge and discharge pumps.

 

SeptiTech models M400N, M550N, M750N, M1200N, M1500N, M2500N and M3000N and SeptiTech Engineered Systems

The SeptiTech unit (the ‘System’) is installed in series between the building sewer and the soil absorption system (SAS) of a standard Title 5 system in a manner which neither intrudes on, replaces a component of, or adversely affects the operation of a Title 5 system constructed in accordance with 310 CMR 15.000, subject to the provisions of this Approval. Two or more units may be installed in parallel to accommodate larger design flows.

The System is an aerobic treatment system that uses an enhanced recirculating biological trickling filter treatment process with anoxic phase to reduce biochemical oxygen demand (BOD5), total suspended solids (TSS) and total nitrogen from sanitary wastewater by biological degradation. The wastewater flows into the first of two tanks consisting of a two compartment primary- anoxic tank where primary settling and partial denitrification occur. The second processor tank contains the trickling filter media and pumps for recirculation within the trickling filter, recirculation back to the anoxic tank and for discharge to the distribution box of the SAS or to a pressure distribution system. In addition to BOD reduction, further nitrification occurs in the mixed-liquor as it passes through the trickling filter with the ammonium in the wastewater converting to nitrate. The System uses a hydrophobic media composed of either polystyrene beads or polystyrene beads with honeycomb shaped solid media, in a two-stage process that allows biological growth within the media pore spaces.

SeptiTech Models M400N through M750N come prefabricated in HDPE or concrete tanks and have hydrophobic bead media in mesh bags. SeptiTech Models M1200N through M3000N are configured similar to M400N series tanks however these units include a larger processor tank and use a combination of the larger commercial solid media and hydrophobic bead media in mesh bags. A programmable logic controller (PLC) controls the treatment process. The PLC continuously monitors incoming flows and adjusts the treatment process (recirculation, recycle, sludge return and discharge cycles).

• Wastewater from the primary anoxic tank enters the treatment tank and collects in a reservoir at the base of the tank where it mixes with treated wastewater,
• A recirculation pump controlled by the PLC pumps the wastewater to the treatment area at the top of the tank where air is drawn into the wastewater,
• The aerated wastewater is sprayed over the hydrophobic media which is suspended above the reservoir, wastewater trickles through the media and returns to the reservoir,
• Wastewater is circulated over the media 70 or more times per day,
• Effluent is returned on a scheduled basis to the anoxic tank for denitrification
• Solids in the reservoir are periodically returned to the anoxic tank

The control panel including alarms are mounted in a location accessible to the operator (or Service Contractor) of the System.

Massachusetts Technology Approvals

Approval Type	General	Remedial	Provisional	Pilot
Secondary Treatment
Nitrogen Removal Credit			(Some Models)
Phosphorus Removal Credit

Please check the Title 5 Innovative/Alternative Technology Approval Letters webpage at Massachusetts DEP for the most up-to-date information.

Real-World Data

Test Center Reports & Data