Layne Heavy Civil – Complete Mix Digester

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Layne Heavy Civil – Complete Mix Digester

Water, Mineral, Energy

About the Company:

Layne Heavy Civil offers complete EPC (Engineer Procure Construct) services utilizing proven European biogas technology for your renewable energy project.

Layne has partnered with experienced industry leaders in the AD field offering over 30 years of experience in the design, construction and commissioning of biogas plants worldwide. This teaming arrangement provides the renewable energy industry the full service construction capabilities of a nationally recognized water resources contractor with proven performance of state of the art European technology.

About the Solution:

The most common biogas system is a complete mix CSTR-Digester.  The CSTR features a gas tight, vertical, cylindrical digester vessel.  The mixing of its contents is provided by a centered vertical low-speed agitator which is characterized by its high circulation rate.  Thus the digester content is perfectly mixed.

At the same time, the low rotation speed guarantees gentle treatment of the anaerobic microorganisms and due to continuous mixing, provides optimal substrate transport for the bacteriological degradation of the organic substances into biogas.

The CSTR-Digester technology is suitable for the treatment of higher solid materials, such as bio waste and sludge, as well as for scum developing material. Sediments can be removed easily during operation. It is especially suitable for large scale biogas plants because of construction sizes of up to 1.9 million gallons (7,500 m3).

This digester type is commonly used for the treatment of all kinds of degradable organic wastewater or sludge, animal manures, industrial and commercial organic waste streams from the food industry, restaurants, grocery stores, etc.

Layne Heavy Civil 4520 N. State Rd. 37 Orleans, IN USA 812-865-3232 Visit Company Website

Solution Type

  • Anaerobic Digestion


  • Equipment Vendor
  • Project Developer


  • Concentrated Nutrients
  • Energy
  • Fiber


  • GHG
  • Odor
  • Pathogens

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Solution 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
Layne is a large industrial contractor with a wealth of experience in construction and project management. They have expressed interest in doing anaerobic digestion projects in the past and have experience with a project at Disney in Florida. Newtrient is not aware of any dairy based system that Layne has constructed at this time. Newtrient will continue to reach out to Layne to get cost, performance and operating data on their system.

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