Technology Catalog - Vendor Detail

DVO, Inc. - Ammonia Recovery
Renewables at Work

Company Description:

DVO is the U.S. market leader for AD and environmental engineering, providing reliable, proven solutions and services to industry and agriculture.  Since 2001, DVO has installed over 100 of its patented Two Stage Linear VortexTM digesters across the nation, producing 80 MW of electricity.  DVO also has expanded internationally, with installations in Canada, Chile, China, Serbia and South Korea.  In addition, DVO’s Phosphorus and Nitrogen Recovery systems economically capture nutrients, allowing customers to safely and reliably remove nutrients from sensitive watersheds and transport them to land in need of these valuable natural fertilizers. 

 

DVO Ammonia Stripping Main Image

Technology Description:

For organic waste streams that are drier than 12% Total Solids (TS) – such as food wastes, poultry layer manure and other mixed wastes scenarios – DVO has developed a digester system that further processes wastes after the digester (called “digestate”) and recycles some or all of it as-needed to wet the incoming (drier) wastes. Critically, the solids that are recovered in this system are dewatered such that they are stackable and transportable. This practice of “treating and recycling” digestate is well-proven on DVO digesters.

 

However, a challenge with the continuous recycling of digestates is the also-continuous accumulation of ammonium/ammonia in the liquid. Poultry waste, for example, is very high in protein compounds. At a level of ammonium/ammonia above 3,500 ppm, ammonium/ammonia can become toxic to the methanogenic bacteria in the digester. Without a (practical & economical) means to remove that ammonia, a digester will become acidic and eventually fail.

 

Therefore, DVO has patented and fully commercialized an efficient Ammonia Recovery (AR) system, where they further process the digester effluent to remove the ammonium/ammonia. Uniquely, using a natural, non-chemical method at a significant savings. DVO also captures this ammonia and places it in a stable and marketable form – thereby creating another revenue source (or operating cost offset) for the digester.

 

The Ammonia Recovery system can also be advantageously deployed wherever there is a nutrient-management benefit to reducing TOTAL nitrogen from a waste stream – including dairy and hog manure, and urban organic wastes generally. When AR is included in a DVO digester process configuration, total nitrogen removals can range from 40-80% depending upon the waste stream and desired agronomic goals.

 

DVO’s Ammonia Recovery (AR) is an efficient, continuous, low maintenance system that requires minimal labor inputs. It truly has resolved the issues surrounding the digestion of “difficult” waste streams such as food wastes, and poultry -- and is an asset to the waste management of any agricultural facility that wants to economically remove and capture ammonia and produce a salable product.

 

DVO Logo

DVO, Inc.

820 W. Main Street

Chilton, WI 53014

USA

920-849-9797

 

Technology Type

  • Ammonia Stripping

Vendor

  • Equipment Vendor
  • Project Developer

Product

  • Concentrated Nutrients
  • Energy
  • Fiber

Problem

  • Nitrogen
  • Odor
  • Pathogens

 

To view additional information about this vendor, click below.


Technology Strengths,Weaknesses and Critical Indicators

Ammonia-N can be harvested from manure and digestate using proven chemical/thermal processes:

  • Produces a concentrated source of nitrogen from a renewable source
  • Requires pre-treatment to remove coarse and fine solids
  • Pairs well with anaerobic digesters because digesters convert organic N into ammonium
  • Chemical storage required for process chemicals and final product
  •  Proven technology for nitrogen recovery, odor control, and pathogen reduction

Newtrient Comments/Opinions:

Ammonia-N can be harvested from manure using proven chemical/thermal processes.

  • Produces a concentrated source of nitrogen from a renewable source
  • Requires pre-treatment to remove coarse and fine solids
  • Pairs well with anaerobic digesters because digesters make more ammonia available
  • Chemical storage required for process chemicals and final product

 

DVO has devoted considerable R&D investment into their unique ammonia stripping technology that aims to: remove the need for chemical addition to raise pH, displace the need for potentially expensive tower media, and reduce the input of required air. They have installed full-scale iterations of their technology at several dairies and poultry facilities across the US, and at this time, DVO considers the technology a part of their product line.

 

DVO continues to strive to improve capital and operating cost structures as well as removal performance and efficiency, which have traditionally plagued ammonia stripping. Newtrient will continue to work with DVO to further refine the cost and performance information as more information comes in with additional experience on commercial dairy installations. DVO's ammonia stripping technology is being evaluated using Newtrient's 9-point scoring process because this technology just recently became commercially available. 

Comments added 02/07/2018

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