Designing the system


The EnviroServer is a pre-engineered pre-packaged MBBR aerobic treatment system designed to treat domestic strength wastewater.  There are several models available in the ES series.  Before choosing the EnviroServer model needed for the site, the designer should verify the following information:


Standard design


  • Type of facility generating wastewater
  • If the system is generating nonresidential wastewater consult with MicroSepTec on design parameters
  • Effluent quality required as per local code
  • Gallons Per Day
  • Using the chart at the beginning of this section, select the EnviroServer that is closest to the estimated hydraulic loading
  • Do not select a system if you expect the actual flows will be greater than design flow
  • Availability of electrical for the EnviroServer


Influent characteristics (NSF/ANSI standard 40 CLASS I)

Note:  The following typical residential influent wastewater characteristics must be met to meet treatment standard for NSF/ANSI 40 CLASS I Treatment standards.

BOD5: 100-300 mg/L
TSS: 100-350 mg/L
FOG: <50 mg/L
Temperature: 50F-86F
Denitrification Design


Note: The key to superior denitrification is controlled recirculation of treated wastewater through a treatment system that contains biomedia for attached growth of beneficial organisms.  These organisms aid and support the denitrification process.


The EnviroServer was specifically developed for denitrification of wastewater.  In the standard operation of the system with typical residential strength wastewater the EnviroServer will reduce total Nitrogen by 50%.  If greater than 50% reduction of Nitrogen is required, timed recirculation should be used, using either a Solenoid Valve or Mechanical Recirculation Pump (MRP).  If greater than 65% reduction in Nitrogen is required, MicroSepTec must be consulted for system design.  With designs of greater than 65% reduction in Nitrogen, MicroSepTec may require additional chemical feeds needed to control PH, Alkalinity, Phosphorous and other chemicals that affect the stoichiometry of the system to ensure the desired effluent quality is met.  It is highly recommended that flow monitoring be used to control proper recirculation ratio.


  • Choose a model that is as close to designed Gallons Per Day required without under-sizing
  • Metered effluent flow of the system is needed for proper adjustment of recirculation
    • If targeted effluent Total Nitrogen is less than 25mg/L it is highly recommended that pump discharge with a flow meter (both supplied by others) be installed to help determine actual flows for setting proper recirculation, future service, and trouble shooting
  • Known or estimated influent organic load
  • Desired effluent quality for local jurisdiction
  • Future potential high and low flow situations


Influent characteristics (NSF/ANSI Standard 245)

Note:  The following typical residential influent wastewater characteristics must be met in order to meet minimal treatment of 50% denitrification.

BOD5: 100-300 mg/L
TSS: 100-350 mg/L
TKN: 35-70 mg/L
FOG: <50 mg/L
Alkalinity:> 7:1 ratio no less than 175 mg/L (alkalinity may need adjusting in certain situations)
Temperature: 50F-86F

PH: 7.5-8.0 SU