• Manure Digester
  • Manure Digester
  • Manure Digester

Manure Digester

10 Litres, 205 Litres

Designed for the following manure systems: Shallow & deep pit systems, straw packs / dry mounds & bio-shelters, shallow gutters with scrapers, slurry stores & lagoons, solid separation systems, open fields & pens.

May also be with used with various compost systems such as domestic compost enclosures.

Decreases odors and gases for a safer, healthier and more pleasant environment for workers and livestock. Loosens, liquifies, and reduces solids for easier pumping. Aids in removing and preventing crusts for easier manure management. Reduces overall volume to minimize hauling, frequency of pumping and spreading which saves time and money.

  • Independent Trials
  • Swine Industry
  • Poultry Industry
  • Cattle / Feedlot Industry
  • Other Industries
  • Downloads
  • F.A.Q.

Average odor reduction of 83% (Iowa State University)

Ammonia gas reduction of 63% within barns (Iowa State University)

Nearly 100% reduction in depth of organic solids in pits. Treated pits also maintained a thin liquid consistency and a complete absence of crusting. (AURI – Agricultural Utilization Research Institute)

Reduces ammonia volatilization and retains more N in manure

Loosens, liquefies, and reduces solids for easier pumping

Improves breakdown of waste materials

Can be applied directly into pens containing animals

Save up to 45% on manure handling costs

Spreadable manure in as little as 90 days

Retains available nutrients in manure

Helps decompose bedding

More available nutrients retained in manure

Can be applied directly into pens containing animals

Manure Digester Safety Data Sheet (SDS) English / French
Manure Digester Application Guide Contains guidelines for determining application rates. Download
Manure Digester Technical Bulletin SHAC research information. Download

Initial applications of Manure Digester are generally based on volume of the presently stored waste. Maintenance rates are based on the rate of inflow of waste from confinement operations. Variable rates are used according to the severity of the problems related to the waste (eg. high solids to liquids ratio, offensive odors, dry-crusting, solids accumulation, lack of percolation, pest infestation).

Rates are as follows: Lagoon/pit stored waste can be treated at any rate ranging from 10L to 30L per 100,000 gallons of waste. Adequate moisture must be present in the waste for treatment to be effective. Minimum moisture for biological decomposition is 30%. Minimum moisture for waste which must flow is 80%. Therefore, water application and upkeep is often required along with Manure Digester treatment.

To estimate volume, first determine total cubic area:

  • For lagoons, calculate the total cubic area using the following equation: Length x Width x Depth x 0.7 (or appropriate slope factor*) = cubic area (ft³ or m³)
  • For barn pits, calculate the total cubic area using no slope factor: Length x Width x Depth = Total Cubic Area (ft³ or m³)
  • For round slurry stores (cylinder-shaped), calculate the total cubic area using the following equation: Depth (height) x 3.14 x Radius2 = Total Cubic Area (ft³ or m³)

Then multiply total cubic area by one of the following:

  • 6.25 to convert cubic feet to Imperial gallons
  • 7.5 to convert cubic feet to US gallons
  • 1000 to convert cubic meters to Litres

* To calculate the slope factor, simply divide the elevation change in feet by the length of the actual slope. A slope factor of 0.7 (for a 70% slope) may be used for steep sided lagoons. It is important to properly determine the slope value at a site in order to accurately estimate volume.

Yes, Manure Digester has been developed to assist the biological decomposition of all organic matter. For crust applications the crust must first be agitated. This procedure ensures that the solids forming the crust are moist and are broken sufficiently to allow the transfer of oxygen into the lagoon/pit slurry. Oxygen is required as a necessary element in the complete decomposition of organic matter. A depletion of oxygen in the slurry was likely a determining factor in the original cause of the crust formation. That said, continuous artificial aeration is not recommended, (though it can be a useful tool in odor control) as excessive oxygenation of the slurry will prevent the necessary anaerobic biodigestion of organic solids and cause the accumulation of solids in the bottom of a lagoon or pit.

*Excessive disposal of chemicals, cleaners, heavy metals or salts (from feed or water sources) and antibiotics will limit results of Manure Digester application and should be limited as much as possible.

**In barns with sub-floor fans above the pits, maintaining moisture in the slurry is crucial to optimal biodigestion of organic solids, as air drawn past the pit contents tends to dry the waste and perpetuate crusting.

***During periods of drought, it may be difficult to manage moisture in lagoons. Under these circumstances, artificial chemical oxygenation or dry storage of the manure may be satisfactory alternatives to moisture intensive biodigestion.

Yes, solids accumulation in the bottom of the pit is a signal that either biodigestion is being dominated by aerobic microbes or that all forms of microbial activity are being limited for some reason. Manure Digester can assist by binding to toxins (eg. salts/heavy metals) via the activated carbon present in the product while stimulating and balancing the microbial populations that encourage organic decomposition.

Manure Digester has been independently tested for this purpose and findings have indicated reductions in odor as high as 83% and ammonia by as much as 43.1%.

Foaming pits are generally the result of high phosphorus rations and/or excessive cleaning product disposal in the pits. Although Manure Digester can reduce the tendency for pits to foam, this particular situation has not been well studied and optimal application rates/procedures have not been determined. Reducing phosphorus sources in the ration will also reduce foaming.

Independent research and customer testimonial have indicated that applications of Manure Digester to pits and lagoons increase the total nitrogen in manure by 22.5-39.1%. This increased nitrogen content of treated manure can significantly offset crop fertilizer costs.

This varies relative to the pre-treatment conditions, the user's ability to reduce or eliminate mitigating factors, and the required result. Generally odor reductions from pits and lagoons can be measured in 2-4 weeks after initial applications are made. Solids reduction and flow-ability are improved in 3-6 weeks. A minimum retention time of 3 weeks (eg. shallow pits) is required for any product applications to be effective. With regular monthly maintenance applications, pits/lagoons can be treated for up to six months consecutively before being flushed.

In pits, changes in any part of the barn operation pre-assessment conditions may potentially affect the result of Manure Digester application (eg. feed ration alterations, medication applications, cleaning procedures, abnormal humidity and/or temperature changes, genetics, etc). Lagoons are similarly affected; however, they are under additional exposure to changes in local weather changes (eg. heavy precipitation, drought, extreme cold/heat, etc). If this occurs, a SHAC certified distributor or technical representative will be able to help you determine what may have occurred to cause the change.

If corners or areas furthest from the plugs or agitators are not draining well, but the remainder is, the problem may be the solids to liquids ratio (>80% moisture is required for sufficient biodigestion to maximize flow-ability). Also, individual pit drainage design may require a specific procedure to be followed in order to properly flush the pits clean (eg. hairpin pits - two drain plugs and a semi-complete wall dividing two pits). This design requires that a single plug is pulled; alternating sides each time the pit is flushed. Past solids accumulations in a single pit may be affecting and perpetuating poor overall drainage. Inadequate drainage piping may cause outflow pipes to slow and/or back-up to the degree that solids remain in the pits while liquids are removed (eg. two 8 inch pipes collecting into a single 10 inch diameter pipe will create back pressure and not allow free flowing of the slurry from the pit to the lagoon).

Two to three days after treatment of a lagoon or pit the liquids should be bubbling and biologically more active than prior to treatment. If no activity is observed cease treatment and contact a SHAC technical advisor to assist you in determining what factors in your operation may be adversely affecting the biological activity in the slurry (eg. excessive amounts of antibiotics, heavy metals, salts, cleaners/sanitizers, etc)

It is not recommended because new concrete has a tendency to leach lime based minerals which can negatively impact microbial activity in general. Try to use the pit for at least two flushes before applying Manure Digester.

Manure Digester must be applied at numerous locations within a pit or lagoon to achieve adequate dispersal of the product. If the manure being treated is fairly solid (no standing water above solids) it is recommended that water is also added during the application of Manure Digester. Enough water should be added to maintain a minimum of one inch of liquid standing above the accumulated solid matter. The water ensures a minimum of adequate moisture throughout the slurry and maximizes the ability for Manure Digester to stimulate viable populations of aerobic and anaerobic microbes which is crucial to achieve odor and solids reduction.

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