The CAFO Challenge
Concentrated Animal Feed Operations face intensifying pressure on two fronts simultaneously — operational efficiency and environmental compliance. Manure management sits at the intersection of both. Poorly managed slurry creates economic burden through labour costs, structural damage to equipment, regulatory exposure through odour and emissions, and downstream soil health consequences when over-loaded lagoon water is applied to land.
The widespread adoption of hybrid wheat straw as bedding material has compounded the problem significantly. New short-stalk wheat varieties produce thicker, denser bedding material that resists microbial degradation. The result is heavy crust formation in pull pits and lagoons — creating expanded anaerobic zones, elevated hydrogen sulphide and ammonia production, increased insect breeding environments, and substantially higher labour requirements for solids removal.
Chemical inputs cannot solve a biological problem.
Conventional approaches to pit and lagoon management rely on physical removal, chemical treatment, or dilution. Each carries cost, risk, or both. The most effective and sustainable path is to restore the microbial activity that breaks down solids naturally — dramatically reducing the need for human intervention, chemical inputs, and the environmental burden placed on downstream land.
Hybrid Wheat Straw Problem
Modern short-stalk wheat varieties produce bedding with thicker cell walls and higher lignocellulose content. Standard Bacillus blends lack the cellulase enzyme activity to break this material down efficiently, causing crust to build progressively across the season.
Anaerobic Zone Consequences
As crust depth increases, anaerobic zones expand below it. These conditions drive ammonia volatilisation, hydrogen sulphide production, and VOC generation — creating welfare risks for housed animals, health risks for workers, and odour complaints from surrounding land.
Regulatory Direction of Travel
UK and EU regulatory frameworks continue to tighten around agricultural ammonia emissions and nutrient management. Operations that cannot demonstrate measurable reduction in NH3 and odour output face increasing scrutiny and potential permit conditions.
The RAD Microbes Formulation Approach
RAD Microbes worked with Aster Bio to develop a targeted biological formulation specifically designed to address the structural and biochemical challenges of modern CAFO manure management. The formulation goes beyond standard Bacillus blends by incorporating organisms selected for their performance under the specific conditions found in pull pits and aerated lagoons.
The dry formulation is broadcast directly onto hog house floors and washed through slats into pull pits during routine washdown — no additional equipment, no specialist application. For lagoon treatment, product is broadcast from the shore, enabling rapid biological activation across the full water surface.
Trial Design & Comparative Testing
Formal research-grade trials were conducted in commercial hog farming operations in Russia in partnership with a specialist agricultural services company. The trials compared five treatment conditions across two testing environments — working pull pits inside live hog houses, and controlled 50-litre batch test pots — with measurements taken before treatment commencement and at the four-week point.
Measurements covered physical and chemical characteristics of slurry (suspended solids, COD, BOD5, ammonia, pH, volatile solids), atmospheric gas analysis inside barns (NH3, H2S, VOC, CH4, NO, NO2, CO2), and odour power assessment via olfactometer. Sludge depth in pits was also tracked across three application points per section.
Pull Pit Results — Working Hog Houses
The pull pit trials were conducted in live commercial hog housing. All five treatment conditions were applied simultaneously across separate sections of the same facility, ensuring consistent baseline conditions. Results are reported as percentage change from pre-treatment baseline after four weeks.
| Parameter | Control | RAD / AB S20 ★ | Ecomic Pro B | Bactofor-3 | Microzyme WT |
|---|---|---|---|---|---|
| Suspended Solids (liquefaction) Key Metric | -30.3% | +184.1% | -32.6% | +57.5% | +19.1% |
| BOD5 (biological activity) | +54.4% | +709.1% | +648.5% | +251.6% | +174.1% |
| NH3 Barn Atmosphere | +34.1% | -29.9% | -15.9% | -19.1% | -31.5% |
| VOC Barn Atmosphere | -11.1% | -55.6% | -35.7% | 0% | +100% |
| H2S (all <2.0 ppm — safe) | +5.0% | +166.7% | +237.5% | +30.0% | +25.0% |
| COD | +54.7% | +720.7% | +654.7% | +256.9% | +179.7% |
| NO (nitrogen oxide) | -98.4% | -80.0% | -98.6% | -94.0% | -97.7% |
| Odour Power D/T (olfactometer) | +11.0% | +22.3% | -23.7% | -20.0% | -75.7% |
What the solids liquefaction result means in practice.
The 184% increase in suspended solids in the water phase is the headline result for operations managers. This confirms that solid crust and settled sludge is being actively converted into liquid form by microbial activity. In a pull pit system, liquid material flows freely through slats and washdown channels into downstream lagoons. Solid material does not. The RAD formulation converts the problem directly at source, eliminating the need for manual labour, additional water volumes, or mechanical agitation to move solids out of the housing environment.
H2S readings across all treatment plots remained below 2.0 ppm throughout the trial — well within safe working limits. The increases recorded reflect enhanced anaerobic activity in deeper pit zones during active solids breakdown, not a welfare or safety concern.
Batch Test Results — 50-Litre Controlled Pots
Parallel testing in controlled 50-litre batch pots allowed isolation of biological variables and more precise gas-phase measurement. Starting conditions were standardised across all five treatment plots. Results confirm the field trial data and add additional precision to odour reduction performance.
| Product | Before Treatment (D/T) | After 4 Weeks (D/T) | Change |
|---|---|---|---|
| Control (untreated) | 500 | 500 | 0% |
| RAD / AB S20 Best Result | 500 | 60 | -88% |
| Ecomic Pro B | 500 | 400 | -20% |
| Bactofor-3 | 500 | 100 | -80% |
| Microzyme Waste Treat | 500 | 100 | -80% |
The batch test odour result is particularly relevant for UK operators. Planning applications for new or expanded CAFO facilities increasingly require odour impact assessments and mitigation commitments. A demonstrated 88% reduction in odour power under controlled conditions provides a strong baseline for both regulatory engagement and neighbour relations management.
Pit Sludge Level Data
Sludge depth measurements were taken at three application points within each treatment section before and after the four-week trial period. A reduction in measurable sludge depth is the expected long-term outcome of a successful biological programme driven by solids liquefaction.
| Section | Product | Point 1 Before | Point 1 After | Point 2 Before | Point 2 After | Point 3 Before | Point 3 After |
|---|---|---|---|---|---|---|---|
| Section 4.3 | RAD / AB S20 Lowest Final | 10 | 0 | 34 | 58 | 15 | 4 |
| Section 3.1 | Control | 6 | 15 | 2 | 22 | 0 | 35 |
| Section 3.2 | Ecomic Pro B | 0 | 5 | 26 | 38 | 10 | 10 |
| Section 4.2 | Bactofor-3 | 13 | 2 | 17 | 1 | 6 | 0 |
| Section 5.1 | Microzyme WT | 0 | 0 | 20 | 47 | 8 | 0 |
The sludge level data shows variation across measurement points that reflects the complexity of monitoring within a working hog house. The increase recorded at Point 2 in the RAD section is consistent with active solids liquefaction drawing material from adjacent pit zones into the measurement area — a function of the suspended solids conversion mechanism confirmed in the liquid phase data. A full-barn trial would provide more definitive sludge reduction figures. The suspended solids data from the liquid phase measurements is the stronger and more consistent indicator of biological activity — and RAD consistently leads all products tested on that metric.
Quebec Dairy Farm — Lagoon Management
A dairy operation in Quebec has been running the RAD formulation in their manure treatment lagoons as part of an ongoing management programme. The operator applied the same biological blend used in the Russian hog house trials, adapted for open lagoon application in a dairy context.
As biological treatment improves the nitrogen conversion and microbial profile of lagoon water, land application becomes a more effective and more controlled nutrient input rather than a waste disposal exercise. This shifts the economic framing of manure management from a cost centre to a partial nutrient recovery system.
Application for UK Hog Operations
The challenges documented in this case study are directly applicable to UK intensive pig production. UK operators using pull-pit housing systems with wheat straw bedding face identical structural biology problems to those that drove the Russian trial programme. The regulatory environment in England, Wales, and Scotland has also accelerated significantly in terms of ammonia emission obligations and nutrient management planning requirements.
Ammonia Reduction Obligations
UK National Emission Ceilings Regulations and the Gothenburg Protocol commit the UK to progressive ammonia reduction targets. Intensive pig operations are primary contributors. The 30% NH3 reduction demonstrated in live barn conditions provides a directly relevant data point for compliance planning conversations.
Nutrient Neutrality & NVZs
Operators in Nitrate Vulnerable Zones face strict controls on slurry application volumes and timings. Improving the quality and biological activity of lagoon water through microbial treatment supports more efficient nutrient use and reduces the risk of over-application events that trigger regulatory action.
Labour & Operational Cost
The conversion of pit solids to liquid phase is one of the most labour-intensive operations in pig housing management. Eliminating or substantially reducing the frequency of manual pit cleaning translates directly to measurable labour cost savings and reduced worker exposure to hazardous conditions.
Planning & Odour Management
UK planning applications for new or expanded livestock facilities require odour impact assessment and documented mitigation strategies. An 88% reduction in odour power under controlled conditions, and a 56% reduction in VOCs in live barn atmosphere, represents a strong evidential base for planning documentation and community engagement.
A biological solution with a documented evidence base.
RAD Microbes is positioned to bring the Aster Bio formulation to UK CAFO operators with a clear value proposition: field-validated biological treatment that reduces solid waste management burden, cuts atmospheric ammonia and odour output, supports regulatory compliance, and improves the agronomic value of treated lagoon water applied to land. This is a documented outcome from a comparative trial programme conducted under commercial operating conditions.
Begin a Conversation
RAD Microbes welcomes enquiries from UK pig producers, farm managers, and agricultural advisors interested in understanding whether a biological treatment programme is appropriate for their operation. The starting point is always a site-specific conversation — understanding your housing system, your current management approach, your regulatory position, and what measurable outcomes matter most to you.
There is no obligation at the enquiry stage. We will review your situation and give you an honest assessment of what a biological programme can and cannot deliver for your specific context.