Manure and Digestate Treatment

Digested Organics has solutions for both small and large farms, in addition to farms that already have a digester: the BioEliminator™ and Nutrient Concentration & Water Reclamation (NCWR) System. Together these form our Integrated Manure Management System (IMMS). The BioEliminator™ is a high efficiency anaerobic digester for fast manure treatment and the NCWR System reduces the volume of manure or digestate to produce a concentrated fertilizer and clean, reusable water.

Download a one page overview of the Integrated Manure Management System

Key Features:

  • Reduces manure hauling and spreading costs

    Greywater effluent is ideal for irrigation, helping reduce costs and keep trucks off the roads

  • Reduce odors, pathogens, and runoff

    Helps prevent groundwater contamination and reduces odor complaints

  • Grow your herd without adding more land

    Effectively manage your nitrogen and phosphorus when expanding your operations

  • Compact, scalable, and modular design

    Customizable solution with short 3-5 day residence time for high-rate treatment

  • Turn manure into greywater with almost no solids and 65% less phosphorus–ideal for irrigation
  • Destroy >99.9% of pathogens to protect groundwater
  • Add our Nutrient Concentration & Water Reclamation System to generate water suitable for direct discharge or reuse as drinking water in the barn
  • Reduce manure phosphorus by 65% and concentrate it in a solids product that can be used as a targeted fertilizer
  • Mineralize organic nitrogen to ammonia-nitrogen, a more bioavailable fertilizer
  • Add our Nutrient Concentration & Water Reclamation System to reduce the volume of manure and create a nutrient-rich liquid fertilizer
  • Convert the organic matter in manure into biogas containing >65% methane
  • Use a boiler to combust biogas and generate heat, reducing propane purchases on the farm
  • Use a generator to combust biogas and generate electricity and heat
  • Use a dryer to produce dry bedding or feed

Example process flow diagram for a typical dairy farm (shown with optional dryer):

BioEliminator™

How does the BioEliminator™ work?

  • We recommend using a screw-press to remove coarse solids from raw manure prior to digestion.
  • The liquid manure (pressate) is then passed through our proprietary high-pressure micronization process to disintegrate solids and create a homogenous mixture ready for digestion.
  • We add BioSupport™ to the micronized pressate to ensure microbes have the proper nutrition they need for optional treatment.
  • The mixture of pressate and BioSupport™ then flows through our patent-pending horizontal anaerobic digester  In most cases, these reactors are buried underground alongside barns or existing lagoons in lengths of 40 to 120 feet long.  The reactors are filled with a filter material that microbes grow attached to. These microbes consume the organic matter and produce methane-rich biogas (natural gas) that we capture to generate power, heat, or compressed natural gas (CNG).
  • By housing the microbes on the filter material inside the reactor, the BioEliminator™ system can remove very high levels of the total suspended solids, organic matter, and E. coli/coliform bacteria present in the waste in less than 5 days. The BioEliminator™ also improves the bioavailability of nitrogen (through mineralization) while capturing some phosphorus as a settled solid that can be easily removed.
  • The effluent greywater is ideal for irrigation and the phosphorus-rich solids, removed periodically throughout the year, can be economically transported and applied where needed most.
NCWR™

How does the NCWR™ work?

  • Raw manure or digestate is first screened to remove large solids that could clog the filtration system.
  • The screened material then goes through an ultrafiltration system to remove all the suspended solids.
  • The solids-free water then goes through a reverse osmosis system to produce clean, re-usable water.

Overall, the NCWR system can turn 1,000 gallons of manure or digestate into 700 gallons of clean water and 300 gallons of concentrated liquid fertilizer, all for less that you currently spend hauling and spreading.

How does the BioEliminator™ compare to traditional farm digesters?

Anaerobic digestion is becoming increasingly popular on large farms in the US.  However, these digesters tend to suffer frequent upsets, produce a nutrient laden wastewater (i.e. digestate) that can be difficult to manage, and are often poor investments financially.  There are several explanations for this lackluster performance:

  • Shorter treatment times

    Mixed or plug-flow digesters are typically designed with a 30 to 60 day retention time, requiring large tanks that are expensive to build and take up lots of space.  The BioEliminator™ is designed for a 3-5 day retention time.

  • Better treatment efficiency

    Only 30-50% of the organic matter in animal manures is typically converted into renewable natural gas in traditional digesters, meaning 50-70% of the energy value of this waste is being left untouched.  That’s a lot of uncaptured revenues and excessive amounts of oxygen-consuming material that can run-off into nearby waterways! The BioEliminator™ will convert >90% of the organic matter into biogas.

  • Cleaner effluent

    Typical digesters produce a wastewater called digestate that is high in ammonia and phosphorous, often times requiring storage (another costly tank) and hauling to increasingly distant farm fields for spreading during allowed times.  While the nutrient value in digestate does have some value, in many situations, the cost of storing and transporting this wastewater outweighs the financial benefits.  The greywater exiting a BioEliminator™ is ideal for irrigation throughout the growing season.