New Technology Transforms Farm Effluent into Cash Crop

A pioneering technology that transforms farm manure into valuable Soil Amendment and Renewable Fuel is catching the US farming industry attention.

When you consider a well fed hog can produce up to 2.5lbs of manure per day and some farms in the US have concentrated up to 70,000 animals into one location, that’s nearly 90 tons of manure produced per day - every day.  A dairy cow produces apx 120 lb/day. Today, the most common method for disposing this mountain of effluent is to plow or spray it onto crop fields which not only present logistical issues, it has potentially serious implications for health, public safety and the environment. In an age where manure management practices are under environmental scrutiny, an innovative version of a proven technology can now produce an effective alternative management system and create a cash return.




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In raw state manure has value as soil amendment but nothing like the value it offers when the solids are dried. (Source: USDA Soil Tilth Laboratory, Ames, Iowa)  It’s a matter of getting the maximum volume of recoverable nutrient out of a manure source and putting it on a field with the least amount traffic at the lowest wheel weight possible, says Crena Resources. And by eliminating contaminated water typically associated with spreading liquid manure, many other risk exposures are also eliminated.

When an animal excretes solid waste there is a 3 day window of opportunity to dry the material and capture maximum available nutrient before biological activity starts to break the solids down. As decay progresses the volume of available nutrients diminish. The Crena technology works by eliminating moisture from manure to stop bio-decay and capture nutrient in a dry stable form more suitable for topical application.

It is well recognized that manure works as a soil fertilizer because of the nutrient it carries and its ability to biotically stimulate soil into becoming more fertile. Fresh Hog manure for example, typically carries 3.86% Nitrogen (N), 1.92% Phosphorous (P2O5) and, 1.43% Potassium (K2O) (samples @ 17.82% then dried and tested over 17 weeks by USDA certified laboratory.)   

A 10,000 gallon tanker full of liquid manure @ 2% solids and weighing 98,000 lb could distribute apx 550 lbs of solids to a field. However, if local regulation restricts the distribution of raw liquid manure to 3500 gallons applied per acre, and volatilization and runoff loss is 50%, then net N value applied by liquid manure is calculated at 11.27lbs per acre. 

It is universally recognized amongst Corn growers that 180 lbs ± of Nitrogen must be replaced per acre after each harvest.  Per the manure sample test results referenced, it shows that 180 lb of N can be recovered from 4,800 lb (2.33 Tons) of dried manure. More significantly, any problem associated with the volume of contaminated water (3,300 gal) in raw liquid manure required to deliver only 11.27lbs of nitrogen, is eliminated.   

Drying high volumes of the stuff rapidly and efficiently (on the farm) is the promise of new mobile technology offered by Crena Resources of California. When the reduction in scale and weight of equipment to spread dry manure is assessed, the concentration of mineral and biotic nutrient delivered to a field at one twelfth the wheel weight, one answer to the “Why Dry Manure” question becomes very clear.


The value of a system that has proven its capability when drying; wheat for flour, coal slag and waste wood for high octane furnace fuel and sewage sludge for fertilizer and heating fuel, its viability is assured. Utilizing it to dry wet manure for biotic fertilizer is a logical application where a high volume of nutrient rich raw material is abundantly available. The Crena mobile dryer will turn manure to cash when adopted for ‘on-farm’ service with minimal capital investment. Crena Resources Business Plan accommodates Joint Venturing with companies that currently offer manure disposal services to livestock farmers.    

Whether the dried manure is used by the livestock farmer, or sold at a price equivalency for comparable NPK grade Biotic Fertilizer ($350.00 - $400.00 per ton depending on market), it promises to add value at many levels. Creating a biotic base ingredient from raw liquid manure to produce higher NPK grade Biotic Organic Fertilizer is the first upgrade. When soil fertility is increased without the negative effects of soil saturation and compaction, its real value proposition can start to be assessed.



The environmental impact of spreading manure in dry form deserves consideration.

 US Federal Court judgments entered during 2018 that exceed $500 million dollars against a single livestock producer (McKiver et al v. Murphy-Brown, LLC.) in one state, it demonstrates how successful nuisance lawsuits because of; smells, flies & pests, are fast becoming a new threat for livestock farmers and must be taken seriously.


The Crena Dryer is driven onto a farm when stockpiled manure is ready to be processed. Components assembled on two trailers that comprise the complete module are connected and when ready, pre-conditioned manure is fed into the module.

o   Dried manure powder is deposited into large Tote bags for transport and storage by the farmer or purchaser.

o   Water vapor gas produced off the drying process is condensed and clean water is recycled for farm use.  

How it all happens is the subject of USA and European Registered Patents.

It is required of farm management to provide adequate access to the raw material.

 The system provides cost effective Alternative Manure Management, which is designed to increased farm profits at multiple levels.

Some of the largest livestock operations in the country are currently evaluating the system for its ability to monetize manure in their Crop-Feed-Crop cycles.

Partnership and licensing inquiries welcomed.

Contact Crena Resources:
Tel: +1 (866) 572-6909