Development of the Processed Based Ammonia Model

1
Development of theProcessed Based Ammonia Model
ISSRC University of California at
Riverside University of California at
Davis Environ Iowa State University

• NH3 Conference Call, July 30, 2004

2
Overview

• Review conference call (06/25/04) minutes
• Future monthly NH3 conference calls
• Coordination among the NH3 team
• Brief overview of EPA NEI ammonia emissions
• Current progress on the process-based ammonia
  emissions model
• Discussions on the data document (due 08/31/2004)
• Key dates in August

3
Review conference call (06/25/04) minutes

• Coordination among the NH3 team
• Model Development
• Model framework
• Development of farm ammonia emissions model
• Transfer of science equations
• Prepare final document.
• Three separate documents would be produced.
• Science document (Draft 03/31/04 Final
  09/30/2004)
• Data document (Draft 08/31/04 Final 02/28/05)
• Coding document (Draft 09/30/04 Final
  12/15/04)
• Discussions on the data document

4
Future monthly NH3 conference calls

• Monthly conference call on last Friday of each
  month (1200 EDT, 1100 CDT, 1000 MDT, 900 PDT)
• June 25, 2004
• July 30, 2004 (Ruihong, Tom, Zion)
• August 27, 2004 (Jim, Tom, Zion)
• Sept. 24, 2004 (Ruihong, Jim, Tom, Zion)
• October 29, 2004 (Zion, Ruihong, Jim, Tom)
• November 19 (Zion, Ruihong, Jim?, Tom)
• January 14, 2005
• February 28, 2005
• March 25, 2005

5
Coordination among the NH3 Team(Personnel
Updates)

• UC Davis (Ruihong, Jim, Tom, Jactone)
• taking the lead to develop the equations for the
  ammonia model
• Transfer developed equations for each sub-model
  to UCR/Environ
• UCR (Zion, Glen, Gail)
• Data Document (Zion)
• Taking the lead to develop the data document
• Work closely with UCD and Iowa State Univ.
• SQL model development (Glen, and another SQL
  programmer)
• Work with Environ to develop coding document
• Provide feedback to UCD regarding NH3 emissions
  from sub-models
• Environ (Gerry, John, Gary, Thuyen)
• Work with UCR to develop coding document
• SQL model development, will work closely with UCR
  and UCD
• Iowa State University (Hong-wei)
• Work with UCD and UCR on the data document and
  data collection

6
EPA NEI Ammonia Emissions from Animal Husbandry
Operations

• US EPA National Emission Inventory Ammonia
  Emissions from Animal Husbandry Operations, Draft
  Report, January 30, 2004.
• EPAs approach
• Determine county-level population of animals for
  2002
• For each county, apportion animal population for
  beef, dairy, swine, and poultry to a manure
  management train (MMT).
• Estimate county-level emissions from each MMT
  using emission factors obtained from literature
  using a process-based inventory model that
  applies mass balance principle.
• Estimate county-level population of animals and
  ammonia emissions for 2010, 2015, 2020, and 2030.

7
EPA NEI Ammonia Emissions from Animal Husbandry
Operations (2)

• Step 1 Animal population estimates
• Step 2 Distribution of MMTs
• Step 3 Estimate Nitrogen Excretion
• Step 4 Identify and develop emissions factors

8
EPA NEI Ammonia Emissions from Animal Husbandry
Operations (3)

• Step 5 Emission estimate calculations

9
Current progress on the NH3 model Development -
UCD

• Animal nitrogen excretion sub-model is completed
  and is being evaluated. The sub-model employs
  equations specified by the new ASAE Standard for
  nitrogen excretion from different species of
  animals based on growth stage, diet,
  productivity, etc. (Fadel)
• Animal housing sub-model is under development
  (Rumsey and Zhang).
• Animal manure storage sub-model is near
  completion (Arogo and Zhang).
• Land application model is in the literature
  review stage (Arogo, Rumsey and Zhang).

10
Animal Nitrogen Excretion Sub-Model

• The model employs equations specified by the new
  ASAE Standard for nitrogen excretion from
  different species of animals based on growth
  stage, diet, productivity, etc.
• Key Input Parameters (Dairy as example)
• Number of cows
• Milk production
• Milk true protein
• Days in milk
• Average live body weight
• Dry matter intake
• Dry matter digestibility
• Crude protein content of ration
• Crude Protein intake

11
Animal Housing Sub-Model

• Patterned after housing models developed by
  Pinder (2004) and Hutchings (1996) with new
  inclusion of nitrogen release from feces as well
  as from urine and an expanded list of housing
  types and manure collection methods.
• Well-mixed and lumped mass transfer and balance
  models using ordinary differential equations to
  track the mass balances of feces, urine, urea,
  and total ammonia nitrogen.
• Key input parameters
• Ambient weather data
• Animal population
• Defecation and urination rates
• Manure removal method and schedule
• Floor and pit surface areas
• Ventilation type and rate

12
Manure Storage Sub-Model

• Well-mixed fed-batch model for storage ponds and
  well-mixed continuous model for treatment
  lagoons, using partial and ordinary differential
  equations to track the mass balances of manure
  and total ammonia nitrogen.
• Assumed that the feces degradation follows the
  first order to allow calculation of ammonia
  release from the feces over time.
• Key input parameters
• Environmental conditions around the storage
• Manure (Urine and Feces) daily mass loading rate
• Storage time

13
Discussions on the data document(draft version
due 08/31/2004)

• A data exchange format (input data format for the
  NH3 model) based on the Nation Emissions
  Inventory Input Format (NIF) is being developed.
• Potential data sources include
• US EPA The EPAs Draft Report (National Emission
  Inventory Ammonia Emissions from Animal
  Husbandry Operations, Draft Report, Jan 30, 2004)
  along with animal population and emissions at
  http//www.epa.gov/ttn/chief/net/2002inventory.htm
  l
• Census of Agriculture website (http//www.nass.usd
  a.gov/census/)
• Interactive website for data at states and
  counties levels (http//agcensus.mannlib.cornell.e
  du)
• A three CD-ROM set containing all of the 1997
  Census of Agriculture Geographic Area Series
• USDAs National Agricultural Statistical Service
  (NASS) website that provides data on livestock,
  farms, etc.. (http//www.usda.gov/nass/search.htm)
  .

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Discussions on the data document(continued)

• Data quality and reliability issues will be
  addressed
• After the draft data document (and data) is
  released in August, States would review, update,
  and send data in this format back to the
  development team.
• Data collected by February 28, 2005 would be used
  to create a final set of NH3 emission
  calculations (in March, 2005).

15
Key dates in August

• ASAE/CSAE Annual Meeting August 1-4 (No formal
  presentations will be made. However, Ruihong
  Zhang and Hongwei Xin will attend the meeting and
  contact potential advisors for the project).
• August 13 (development team meeting at UC Davis)
  to discuss
• Data requirement depend on the exact
  configuration of the science equations developed
  for each sub-model
• Transfer of equations to UCR and Environ.
• Detail breakdown of coding the model between UCR
  and Environ.
• August 27 next conference call
• August 31 release of the draft data document