Design of a HSSF Constructed Wetland - Copy

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 .