In-Situ Groundwater Nitrification and De-Nitrification Remediation Processes Presented ... 2016-01-22¢ 

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  • In-Situ Groundwater Nitrification and De-Nitrification Remediation Processes

    Presented by Steve Mailath, EBA Engineering Consultants

    Ltd. Phone: 403.723.6898

  • Problems with Ammonia and Nitrate

    • Over fertilization (eutrophication) of surface waters with N

    • Ammonia toxic to animal species – fish and invertebrates

    • Nitrate contamination of drinking water – blue baby syndrome – methemoglobinemia

    • Discounted value of brown-field development

  • Environmental and Regulatory Issues

    • Environmental regulations are becoming more stringent with time – Environmental enforcement orders

    • Growing public concern of environmental management

    • Restricted land use

  • Where is the Problem – Who is responsible

    • Fertilizer manufacturing and storage facilities – Brown-field developer

    • Sewage treatment facilities – City of Calgary

    • Agricultural areas – Farmers

    • Airports – Calgary airport authority

  • Problems with Existing Solutions

    • Expense – Treatment facilities – Piping – Operating

    • Large footprint, need to close site

  • In-Situ Groundwater Nitrification and De-Nitrification Remediation Processes

    In-situ nitrification: • Extracting groundwater • Adding oxygen and nutrients • Injection of amended groundwater

    In-situ de-nitrification • Extracting groundwater • Adding carbon and nutrients • Injection of amended groundwater

    By: Steve Mailath, EBA Engineering Consultants Ltd. Patent Pending: David Reese, University Technologies International, Phone: 270.2434

    Dr. Angus Chu, U of C, Phone: 220.8987 Steve Mailath, EBA, Phone: 723.6898

  • Advantages

    • Performs as well as best in class solutions at less than half the cost

    • Full mass removal - nitrates reduced to N gas • Small footprint and less intrusive than most

    solutions • Requires fewer wells and piping • Year round treatment • Free bio-reactor (in situ)

  • Options

    Options Main Limitations Capital ($ Million)

    Operatin g

    ($/year)

    Present Value Cost1 ($ million)

    1. Groundwater Extraction and Irrigation Summer treatment

    $0.85 $57,000 $1.4

    2. Groundwater Extraction and Discharge to City Sanitary Sewer

    Removal of ammonia only

    $0.69 $50,000 $1.2

    3. Groundwater Extraction and Electrochemical Treatment

    High cost $3.1 $155,000 $4.7

    4. Groundwater Extraction and Biological Treatment (Nitrification)

    High cost $1.6 $100,000 $2.6

    5. Groundwater Extraction and Wetlands Disposal

    Summer treatment, low N

    $0.64 $51,000 $1.2

    6. In-Situ Electrochemical Treatment Low perm soils $2.8 >$35,000 >$3.0

    7. On-Site Ex-Situ Biological Treatment High cost $5.0 to $7.0

    >$35,000 >$5.0

    8. In-Situ Nitrification and High perm soils $0.2 $30,000 $0.5

    De-Nitrification $0.1 $25,600 $0.4 1 Present value based upon 15 year life and 5% rate of return.

  • Nitrate Plume

  • Ammonia Plume

  • Site Plot Plan

  • Cross-Section A-A’

  • Cross-Section D-D’

  • Typical Gravel

  • Hydraulic Parameters

    • Section length 425 m (perpendicular to flow • Section thickness 3.0 m • Hydraulic conductivity 49 m/day • Hydraulic gradient 0.0023 • Groundwater velocity 0.3 – 0.5 m/day • Groundwater flux 144 m3/day (22 igpm) • Ammonia concentration 63.2 mg-N/L • Nitrate concentration 94 mg-N/L (i.e., 31 mg-N/L

    in-situ plus 63 mg-N/L generated by nitrification)

  • In-Situ Nitrification

  • Pilot Test Site

  • Test Site

    GROUNDWATER FLOW

  • Test Site

    INJECTION WELL

    EXTRACTION WELL

  • Installing Monitoring Wells

  • Test Site

    TREATMENT SHED

  • Nitrification

    TREATMENT SHED

  • Oxygen Addition

    OXYGEN SOURCE

  • Amendment Addition

    GAS LIQUID REACTOR

    NUTRIENT DELIVERY

    OXYGEN DELIVERY

  • Amendment Addition

    VENTURI

  • Nitrification Results

    0.00

    20.00

    40.00

    60.00

    80.00

    100.00

    120.00

    1 5 9 13 17 21 25 29 33 37 41 45 49 53 57 61 65 69 73 77 81 85 89 93 97 10 1

    10 5

    10 9

    11 3

    11 7

    12 1

    12 5

    12 9

    13 3

    13 7

    14 1

    14 5

    14 9

    Days

    D O

    , A m

    m on

    ia ,

    N itr

    at e

    - N C

    on ce

    nt ra

    tio n

    (m g/

    L)

    0.00

    0.20

    0.40

    0.60

    0.80

    1.00

    1.20

    Ph os

    ph at

    e - P

    C on

    ce nt

    ra tio

    n (m

    g/ L)

    TH13 NH4 TH13 NO3 TH13 DO TH13 PO4 4 per. Mov. Avg. (TH13 NH4) 4 per. Mov. Avg. (TH13 NO3) 4 per. Mov. Avg. (TH13 DO)

    66 – 89 % AMMONIA REDUCTION

  • In-Situ De-Nitrification

  • Pilot Test Site

  • Amendment Addition

    NUTRIENT DELIVERY

    NO OXYGEN DELIVERY

  • De-Nitrification

    NUTRIENT DELIVERY CARBON

    DELIVERY

  • Field Lab

  • De-Nitrification Results

    0.00

    10.00

    20.00

    30.00

    40.00

    50.00

    60.00

    70.00

    3 4 5 6 7 8 9 10 11 12 13 14 15 16 17

    Days

    D O

    , A

    m m

    on ia

    , N itr

    at e

    - N C

    on ce

    nt ra

    tio n

    (m g/

    L)

    4 per. Mov. Avg. (TH1 DO) 4 per. Mov. Avg. (TH1 NH4) 4 per. Mov. Avg. (TH1 NO3)

    Nitrate

    Ammonia

    Dissolved oxygen

    78 – 99 % NITRATE REDUCTION

  • Options

    Options Main Limitations Capital ($ Million)

    Operating ($/year)

    Present Value Cost1 ($ million)

    1. Groundwater Extraction and Irrigation Summer treatment $0.85 $57,000 $1.4

    2. Groundwater Extraction and Discharge to City Sanitary Sewer

    Removal of ammonia only

    $0.69 $50,000 $1.2

    3. Groundwater Extraction and Electrochemical Treatment

    High cost $3.1 $155,000 $4.7

    4. Groundwater Extraction and Biological Treatment (Nitrification)

    High cost $1.6 $100,000 $2.6

    5. Groundwater Extraction and Wetlands Disposal

    Summer treatment, low N

    $0.64 $51,000 $1.2

    6. In-Situ Electrochemical Treatment Low perm soils $2.8 >$35,000 >$3.0

    7. On-Site Ex-Situ Biological Treatment High cost $5.0 to $7.0 >$35,000 >$5.0

    8. In-Situ Nitrification and High perm soils $0.2 $30,000 $0.5

    De-Nitrification $0.1 $25,600 $0.4 1 Present value based upon 15 year life and 5% rate of return.

  • Questions

    In-Situ Groundwater Nitrification and De-Nitrification Remediation Processes

    By: Steve Mailath, EBA Engineering Consultants Ltd. Patent Pending: David Reese, University Technologies International,

    Phone: 270.2434 Dr. Angus Chu, U of C, Phone: 220.8987 Steve Mailath, EBA, Phone: 723.6898

    QUESTIONS

  • Problems with Ammonia and Nitrate Environmental and Regulatory Issues Where is the Problem – Who is responsible Problems with Existing Solutions In-Situ Groundwater Nitrification and�De-Nitrification Remediation Processes Advantages Options Nitrate Plume Ammonia Plume Site Plot Plan Cross-Section A-A’ Cross-Section D-D’ Typical Gravel Hydraulic Parameters In-Situ Nitrification Pilot Test Site Test Site Test Site Installing Monitoring Wells Test Site Nitrification Oxygen Addition Amendment Addition Amendment Addition Nitrification Results In-Situ De-Nitrification Pilot Test Site Amendment Addition De-Nitrification Field Lab De-Nitrification Results Options Questions

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