sep_biozone Subroutine

subroutine sep_biozone()

Uses

  • proc~~sep_biozone~~UsesGraph proc~sep_biozone sep_biozone module~basin_module basin_module proc~sep_biozone->module~basin_module module~hru_module hru_module proc~sep_biozone->module~hru_module module~organic_mineral_mass_module organic_mineral_mass_module proc~sep_biozone->module~organic_mineral_mass_module module~pathogen_data_module pathogen_data_module proc~sep_biozone->module~pathogen_data_module module~septic_data_module septic_data_module proc~sep_biozone->module~septic_data_module module~soil_module soil_module proc~sep_biozone->module~soil_module module~time_module time_module proc~sep_biozone->module~time_module module~carbon_module carbon_module module~organic_mineral_mass_module->module~carbon_module module~soil_module->module~carbon_module 
~ ~ ~ PURPOSE ~ ~ ~
This subroutine conducts biophysical processes occuring 
in the biozone layer of a septic HRU.

~ ~ ~ INCOMING VARIABLES ~ ~ ~
name             |units         |definition
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
bio_bd(:)        |kg/m^3        |density of biomass 
bio_bod(:)       |kg/ha         |BOD concentration in biozone
biom(:)          |kg/ha         |biomass of live bacteria in biozone       
bz_thk(:)        |mm            |thickness of biozone                    
coeff_bod_dc(:)  |m^3/day       |BOD decay rate coefficient
coeff_bod_conv(:)|none          |BOD to live bacteria biomass conversion factor
coeff_denitr(:)  |none          |Denitrification rate coefficient
coeff_fc1(:)     |none          |field capacity calibration parameter 1
coeff_fc2(:)     |none          |field capacity calibration parameter 2  
coeff_fecal(:)   |m^3/day       |Fecal coliform bacteria decay rate coefficient  
coeff_mrt(:)     |none          |mortality rate coefficient          
coeff_nitr(:)    |none          |Nitrification rate coefficient
coeff_plq(:)     |none          |Conversion factor for plaque from TDS           
coeff_rsp(:)     |none          |respiration rate coefficient          
coeff_slg1(:)    |none          |slough-off calibration parameter
coeff_slg2(:)    |none          |slough-off calibration parameter
fcoli(:)         |cfu/100ml     |concentration of the fecal coliform in the biozone 
                 |              |septic tank effluent
ihru             |none          |HRU number
i_sep(:)         |none          |soil layer where biozone exists           
isep_opt(:)      |none          |Septic system operation flag (1=active,2=failing,0=not operated)                 
plqm             |kg/ha         |plaque in biozone
rbiom(:)         |kg/ha         |daily change in biomass of live bacteria
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
~ ~ ~ ~ ~ ~ END SPECIFICATIONS ~ ~ ~ ~ ~ ~

Coded by J.Jeong and C.Santhi. BRC, Temple TX
Septic algorithm adapted from Siegrist et al., 2005

J.Jeong 3/09/09 Failing system: STE saturates upper soil layers Active system

Water content(eqn 4-12), biozone hydraulic conductivity(eqn 4-9), and percolation (eqn 4-8,10,11) are computed in percmain/percmicro

Field capacity in the biozone Eq. 4-6 ! Saturated water content in the biozone - Eq. 4-7

Respiration rate(kg/ha) Eq. 4-2
Mortality rate(kg/ha) Eq. 4-3
Slough-off rate(kg/ha)
Build up of plqm(kg/ha) Eq.4-5

Add build up to plqm ! kg/ha = kg/ha + kg/ha Add STE f.coli concentration by volumetric averaging nutrients reaction rate (Equation 4-13) BOD (kg/ha) 4-14 ! Fecal coliform(cfu/100ml) Eq 4-14, J.Jeong 3/09/09 change in nh3 & no3 in soil pools due to nitrification(kg/ha) Eq.4-13, 4-14
J.Jeong 4/03/09 denitrification,(kg/ha) Eq 4-14
daily change in live bacteria biomass(kg/ha) Eq. 4-1

total live biomass in biozone(kg/ha)
** tu Wunused-label: 1000 format(3i5,50es15.4)

Arguments

None