Larsen Engineers – Recirculating Anaerobic Ditch Digester (RAD2)

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Larsen Engineers – Recirculating Anaerobic Ditch Digester (RAD2)

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Company Description:

Larsen Engineers is a multi-disciplinary firm that has been serving the needs of municipalities, federal and state government agencies, and private companies since its inception in 1955. Larsen offers a broad and diverse range of services including Civil & Environmental Engineering, Survey, Planning and Energy Conservation and has provided services throughout the northeastern part of the United States and Asia. There office is located in Rochester, NY.

Technology Description:

RAD2 ANAEROBIC DIGESTER SYSTEMS: ANALYSIS, DESIGN, FUNDING, IMPLEMENTATION & MANAGEMENT   Recent advances in digester technology paired with development of high-quality, low-cost combined heating and power systems have made anaerobic digesters an attractive option for many modern dairy farms. As more digesters come online, this technology has become increasingly reliable. By integrating established technology with modern farming practices, Larsen Engineers is a leader in the Anaerobic Digester Revolution.

Larsen Engineers 700 West Metro Park Rochester, NY USA 585-272-7310 Visit Company Website

Technology Type

  • Anaerobic Digestion

Vendor

  • Project Developer

Product

  • Energy

Problem

  • GHG
  • Odor
  • Pathogens

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Technology Strengths, Weaknesses and Critical Indicators

Anaerobic Digestion:

  • Long usable life and can be run reliably
  • Creates energy and generates environmental credits
  • Proper feeding & system monitoring is required to avoid system downtime
  • Proven technology for odor control
  • Proven technology for GHG reduction
  • Proven technology for pathogen reduction
  • Different types of systems produce varying gas production rates
  • Requires proper preparation of the feedstock
  • Requires other technologies for energy utilization
  • Requires other technologies for digestate handling
  • Requires other technologies to prevent nitrogen loss
  • Complex systems may require expertise not available on-farm

Newtrient Comments/Opinions:

Anaerobic Digester technology:

  • Is proven technology for odor, GHG and pathogen reduction and energy production
  • Has a long usable life and can be run reliably
  • Require proper preparation of the feedstock
  • Usually requires other technologies for energy utilization
  • Usually requires other technologies for digestate handling
  • Proper feeding & system monitoring is required to avoid system downtime
Larsen Engineers is the first company in the US to use the novel approach of using membrane materials and earth to develop the anaerobic digestion vessel, exterior heating, and in-vessel mixing.  Their flagship project, commissioned in October, 2014, is located at Spruce Haven Farm, LLC (Auburn, NY).  This digester is paired with a McLanahan sand-manure separation system (SMS) where the SMS effluent is processed by the Larsen Engineers Recirculated Anaerobic Ditch Digester (RAD2).  Spruce Haven Farm reported in a Cornell Dairy Environmental Systems case study that the project was financially feasible due to the reduced capital cost over the many other technologies investigated.

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