Prepared by wmc consulting Engineers Inc. Prepared by wmc consulting Engineers Inc



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tarix17.11.2018
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Prepared by WMC Consulting Engineers Inc.

  • Prepared by WMC Consulting Engineers Inc.

  • John A. Wengell




Student Population Fluctuates between 230 students to 300 students

  • Student Population Fluctuates between 230 students to 300 students

  • 50 Faculty Members & 70 Staff Members

  • Water Usage 23,200 GPD (Averaged- School in Session)

  • Population Fluctuates – Added 15% Variation = Average 26,700 GPD

  • Design Flow with a 50% Safety factor (DEEP requirement) = 40,000 GPD



Connect to the Town of Salisbury wastewater treatment system (2+ miles)

  • Connect to the Town of Salisbury wastewater treatment system (2+ miles)

  • Construct a standard type leaching system

  • Install a pretreatment system and disperse effluent via low pressure to constructed leaching bed with an additional leaching layer

  • Install a pretreatment system and disperse effluent via low pressure to constructed leaching bed and thru a series of wetland cells



Use of enhanced pretreatment with deemed cost effective

  • Use of enhanced pretreatment with deemed cost effective

  • On Site disposal allows for groundwater reclamation into existing groundwater system

  • Variety of enhanced pretreatment options approved by DEEP

  • Reduction of cost with installation of wetland cells over additional leaching layer needed to achieve 21 days of travel time



Zenon Systems (Cycle-Let) Technology consisting of pretreatment, anoxic and aerobic stage biological treatment, ultra-filtration membrane separation, carbon adsorption and UV disinfection

  • Zenon Systems (Cycle-Let) Technology consisting of pretreatment, anoxic and aerobic stage biological treatment, ultra-filtration membrane separation, carbon adsorption and UV disinfection

  • Constructed Fill Leaching System

  • Constructed Wetland Cell System





Zenon System is capable of treating Nitrogen to levels less than 10 mg/L

  • Zenon System is capable of treating Nitrogen to levels less than 10 mg/L

  • Zenon System is capable of treating Total Phosphorus to levels less than 2 mg/L

  • Researched and proven to remove total coliform to levels < 2.2 MPN/100ml and virus to levels exceeding 99.998%

  • Performance around State







Effluent dispersed via low pressure dispersal system into leaching bed (18” Washed Stone)

  • Effluent dispersed via low pressure dispersal system into leaching bed (18” Washed Stone)

  • Effluent flows thru a constructed fill layer 24” thick of unsaturated material

  • To avert concerns of mounding a 12” blanket drain of highly permeable material was placed below the leaching fill

  • Allowed to break out at the toe of slope into a collection swale











Wetland Cells were designed to provide 100% bacteria/virus removal back-up to the Zenon System

  • Wetland Cells were designed to provide 100% bacteria/virus removal back-up to the Zenon System

  • Wastewater treatment via constructed wetlands can provide high levels of bacteria and virus removal efficiencies at Hydraulic Residence Times (HRTs) of five to seven days

  • To comply with DEEP requirements the Wetland Cells were designed to have an HRT of a minimum of twenty one days.



Cells were designed to retain 21 days of inflow minus losses

  • Cells were designed to retain 21 days of inflow minus losses

  • Inflow = Treatment Plant design Flow plus a 50% safety factor, Direct Rainfall into the cells and overland flow from run-off

  • Losses = Infiltration, Evaporation, Transpiration and Cell Overflow

  • Conservatively Losses were only computed for Evaporation



Inflow (7,255 c.f./day) – Losses (567 c.f./day) = 6,688 c.f./day

  • Inflow (7,255 c.f./day) – Losses (567 c.f./day) = 6,688 c.f./day

  • Storage of 140,448 c.f. necessary for 21 day requirement

  • Approximately 69,000 s.f. of pond area at a 2’ depth was constructed

  • Discharge Rate of 35 gpm spread over 150’ long level spreader

















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