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How to design a HSSF Constructed wetland from First order model.
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A Wastewater Types
Item Description Units Domestic or Sanitarywastewater
Wastewater type Industrial wastewater
Population Nos. Stormwater Runoff
Residence type
Design Flow Rate 35 m3
Peak Factor 1.7
Max. Flow Rate 59.5 m3/day
Av. Annual Temp. 18 oC
Average Flow Rate 60.5 B Population size
0 - 5000
5001 - 10000
10001 - 15000
Input Output 15001 - 20000
Ammonia Nitrogen NH4+ mg N/l 60 20001 - 25000
Biochemical Oxygen Demand BOD mg O2/l 200 25001 - 30000
Fecal Coliform F cfu/100ml 1000000
Nitrate Nitrogen NO3- mg N/l 45
Organic Nitrogen Org-N mg N/l 60
Temperature oC oC 18
Total Kjeldahl Nitrogen TKN mg N/l 60
Total Nitrogen TN mg N/l 60
Total Phosphorus P mg P/l 15
Input Output
Ammonia Nitrogen NH4+ mg N/l 15
Biochemical Oxygen Demand BOD mg O2/l 30
Fecal Coliform F cfu/100ml 10000
Nitrate Nitrogen NO3- mg N/l 20
Organic Nitrogen Org-N mg N/l 15
Temperature oC oC 18
Total Kjeldahl Nitrogen TKN mg N/l 15
Total Nitrogen TN mg N/l 15
Total Phosphorus P mg P/l 6
Designing a Horizontal Subsurface Flow Constructed Wetland
Basic Design Parameters
Effluent Wastewater Characteristics
General Description
Influent Wastewater Characteristics
= ⋅ ⋅= ⋅= Δ ∕
Residence type
Commercialbuildings
Homes Parameters Description Input Unit
Hospitals Ci Influent Concentration Pollutant 200 m
Institutions Co Effluent Concentration Pollutant30.0 m
Warehouse KTV Temperature dependent rate constant0.983 d-1
t Hydraulic Retention Time -1.930 d
Wetland Input Unit Parameters Description Input Unit
Length 31 m ΔH Head differential 0.100 m
Width 12.5 m L Length 31.000 m
Depth 0.5 m s Hydraulic gradient 0.00323 m/m
Volume 193.75 m3
Parameters Description Input Unit
W Width 12.500 m
d Mean water depth 0.500 m
Ac Cross sectional area 6.250 m2
Parameters Description Input Unit
Ks Hydraulic onductivity 3000 m/d
Ac Cross sectional area 6.250 m2
S Hydraulic gradient 0.003 m/m
Q Flow rate (max) 60.5 m3/d
Designing a Horizontal Subsurface Flow Constructed WetlandCalculations
Basic Design Parameters
Residence Time
Hydraulic Gradient
Cross Sectional Area
Hydraulic Design - Darcy Formula
Average Flow Rate
Process k20 θ
BOD removal 1.104 1.06NH4= removal (nitrification) KNH 1.048 Design Date:
NO3- removal (dentrification)1.000 1.15 Weather:
Temp.
Influent Wastewater Characteristics Influent Concentration Pollutant
Input Effluent Concentration Pollutant
Ammonia Nitrogen NH4+ mg N/l 60 Temperature dependent rate constant
Biochemical Oxygen Demand BOD mg O2/l 200 Hydraulic Retention Time
Fecal Coliform F cfu/100ml 1,000,000
Nitrate Nitrogen NO3- mg N/l 45 First order rate constant
Organic Nitrogen Org-N mg N/l 60 Temperature
Temperature oC oC 18 Temperature coefficient for rate constant
Total Kjeldahl Nitrogen TKN mg N/l 60
Total Nitrogen TN mg N/l 60
Total Phosphorus P mg P/l 15
Nitrification rate constant at 20 oC
Effluent Wastewater Characteristics
Input
Ammonia Nitrogen NH4+ mg N/l 15 Design Flow rate
Biochemical Oxygen Demand BOD mg O2/l 30 Influent Concentration Pollutant
Fecal Coliform F cfu/100ml 10,000 Effluent Concentration Pollutant
Nitrate Nitrogen NO3- mg N/l 20 Temperature dependent rate constant
Organic Nitrogen Org-N mg N/l 15 Mean water depth
Temperature oC oC 18 Wetland porosity (decimal fraction)
Total Kjeldahl Nitrogen TKN mg N/l 15 Wetland surface area
Total Nitrogen TN mg N/l 15
Total Phosphorus P mg P/l 6
First Order Model according to Reed
Fraction of HSSF bed depth occupied by root zone(decimal fraction, 0 to 1)
Wetland Surface Area
Designing a Horizontal Subsurface Flow Constructed Wetland
BOD Removal
LAB.: Design Date:
Test #: Weather:
Sampled By: Temp.
Parameter Input Units
Influent Concentration Pollutant Ci 200 mg/l Influent Concentration Pollutant
Effluent Concentration Pollutant Co 30 mg/l Effluent Concentration Pollutant
Temperature dependent rate constant KTV 0.983 Temperature dependent rate constant
t -1.9299288 d Hydraulic Retention Time
Parameter Input Units
K20 1.104 1/d First order rate constant
T 18 oC Temperature
Temperature coefficient for rate constant θ 1.06 Temperature coefficient for rate constant
KT 0.983
rz
Nitrification rate constant at 20 oC KNH 0.01854 1/d Nitrification rate constant at 20 oC
Parameter Input Units
Q 35 m3/d Design Flow rate
Influent Concentration Pollutant Ci 200 mg/l Influent Concentration Pollutant
Effluent Concentration Pollutant Co 30 mg/l Effluent Concentration Pollutant
Temperature dependent rate constant KTV 0.983 1/d Temperature dependent rate constant
d 0.5 m Mean water depth
Wetland porosity (decimal fraction) n 0.35 Wetland porosity (decimal fraction)
A 385.985755 m2 Wetland surface area
Fraction of HSSF bed depth occupied by root zone(decimal fraction, 0 to 1)
Wetland Surface Area
Designing a Horizontal Subsurface Flow Constructed WetlandFirst Order Model according to Reed et al. 1995
BOD Removal
Fraction of HSSF bed depth occupied by root zone(decimal fraction, 0 to 1)
Wetland Surface Area
Ammonia Nitrogen Removal
= ln − ln ∕ ⋅ ⋅
= ⋅
= ⋅
= 0.01854 + 0.3922 .
LAB.:
Test #:
Sampled By:
Parameter Input Units
Influent Concentration Pollutant Ci 60 mg/l
Effluent Concentration Pollutant Co 15 mg/l
Temperature dependent rate constant KTV 0.983
Hydraulic Retention Time t -1.4102689 d
Parameter Input Units
First order rate constant K20 0.41074 1/d
T 18 oC
Temperature coefficient for rate constant θ 1.048
KT 0.374
Parameter Input Units
rz 1
Nitrification rate constant at 20 oC KNH 0.41074 1/d
Parameter Input Units
Design Flow rate Q 35 m3/dInfluent Concentration Pollutant Ci 60 mg/l
Effluent Concentration Pollutant Co 15 mg/l
Temperature dependent rate constant KTV 0.983 1/d
Mean water depth d 0.5 m
Wetland porosity (decimal fraction) n 0.35
Wetland surface area A 282.053787 m2
Fraction of HSSF bed depth occupied by root zone(decimal fraction, 0 to 1)
Wetland Surface Area
Ammonia Nitrogen Removal
*K20 = KNH
= ln − ln ∕ ⋅ ⋅
= ⋅
= ⋅
= 0.01854 + 0.3922 .