Odour Reduction Technologies

See Also




Odours can be greatly reduced by processing manure - if you have solid manure, by composting - If you have liquid manure, by anaerobically digesting the manure in closed vessels.  These processing practices also substantially reduce pathogen levels in the final product.

In-barn odour levels can be substantially reduced by regular removal of manure to an enclosed vessel (liquid) or to a covered structure (solids), preferably while still fresh, to minimize odour emissions while preserving as much ammonia as possible. There are new belt separation technologies being evaluated and installed that separate feces from urine, which result in lower odour levels and reducing ammonia emissions.


An assessment of odour emissions from land applied swine manure. (2007) [532 KB pdf] E. Smith, R. Gordon, A. Campbell and C.P.A Bourque, Nova Scotia Agric. Coll., Box 550, Truro, NS B2N 5E3; Can. Biosystems Eng. 49: 6.33 - 6.40. Objective of this research was therefore to quantify odour emissions from surface applied swine manure using olfactometry and assess and evaluate a theoretical profile shape (TPS) micrometeorological approach in combination with olfactometry for odour flux field assessments.

Solid Manure Injection Proved Technically Feasible. ( Farmscape Article 2632, Nov. 3, 2007. The Prairie Agricultural Machinery Institute (PAMI) reports that from a technical point of view solid manure injection technology is ready to move to commercialization. The two piece system was designed to land apply solid and semi solid organic fertilizers containing 20 percent solids or higher. One of the potential benefits of getting solid manure below the surface is reducing some  accumulation of nutrients (N & P) at the surface of the soil where they may be susceptible to movement into water bodies by surface runoff waters.

Comparison of Odour Measurements Using Olfactometry and n-Butanol Scale (2002). Qiang Zhang, Dept of Biosystems Eng. U. of Manitoba, Winnipeg, MB R3T 2N2. Odour from swine operations is a complex mixture of many different odorous compounds resulting mainly from the anaerobic decomposition of swine manure. The odour intensity depends on the concentration of each compound and the combination of these compounds as well. There was a strong correlation between the odour concentration measured with olfactometers and the odour intensity of bagged samples measured by Nasal Rangers in the laboratory.

Barn Management and Control of Odours [50 KB pdf]; Stephane LeMay, Prairie Swine Centre Inc, Saskatoon, SK - from  Adv. in Pork Production (1999)Vol. 10 - Odour emanating from the ventilation system of a hog barn, as well as odour produced from manure storage and handling, is a significant contributor to the total farm odour emissions.  In Bundy (1997), figures are presented on the justifiable complaints associated with different odour sources in swine production. Buildings were the source of 22% of the total odour complaints; slurry storage was accountable for 17%; slurry spreading for 52%; animal feed production for 8% and silage clamps for 1%.

Determination of the Areal Extent of Odour Plume from Large Hog Facilities in Manitoba (MLMMI 98-01-04) Full Report [86 KB pdf]- study concluded odours essentially travel in the direction of the wind (longitudinal) and that there is little lateral dispersement in other directions provided the wind is in a constant direction.  

Novel Technology for Hog Manure Odour Control/Remediation. Use of Crystal Engineering, Synthetic Clays, Synthetic Zeolites, Clathrates. (MLMMI 98-01-19)Full Report [63  KB pdf] project explores application of crystal engineering principles to establish the ability of organic clays and metal-organic coordination polymers to retain odour-causing molecules through sorption or adsorption as an odour control and remediation process.  

Development of a Treatment Technology using Lime, Lime-clay Combination and Plant Derived Phyto chemicals for Eliminating Odour from Hog Operations.  (MLMMI 98-01-23) Full Report [46 KB pdf] - This study describes a technology which acts on the root cause of these odours ammonia and sulphur compounds in the manure. The process removes almost all the sulphur compounds from the manure and captures manure to produce clear, odour-free water which can be recycled as barn wash or for watering horticultural crops.  

Demonstration of the Performance of a Three-Stage Waste Treatment Technology. Odour Treatment Through Solids Separation with Aerobic and Anaerobic Digestion.  (MLMMI 98-01-31) Full Report [270 KB pdf] - The process involves passing the manure through a solid-liquid separator to remove the larger solids; anaerobic digestion of the liquid fraction; followed by aerobic treatment.

Development of a Negative Air Pressure Cover System for Swine Manure Earthen Storages in Manitoba (MLMMI 98-01-32) Full Report [178 KB pdf] - negative air pressure cover system will provide livestock producers with a single, inexpensive method to eliminate odour, the most prominent problem, associated with manure storages. 

Measurement of Odour Emissions from Hog Operations in Manitoba (MLMMI 99-01-27) Full Report [86 KB pdf] - Odour emissions were measured by olfactometer and trained observers on ten hog farms in Manitoba. No apparent correlations were found between the odour level and the general farm characteristics, such as the age and type of operation, ventilation system, and manure handling system.

Economic Feasibility Study to Determine the Cost and Market Effectiveness of SEI Technology for Eliminating Odours from Hog Manure(MLMMI 99-01-34)  Full Report [69 KB pdf] - Treatment consists of a two-stage chemical treatment process which results in a significant settling of solids and elimination of odours from the untreated hog manure; objective of this project was to determine the economic feasibility of application of SEI technology under various operating conditions.

Comparison of Odour Measurement Using Olfactory and N Butanol Scale (MLMMI 00-02-11) Full Report [117 KB pdf] - This method was developed by St. Croix Sensory Inc. (Stillwater, MN) to use trained human odour assessors (Nasal Rangers) to quantify odour intensity according to n-butanol reference scales. The specific objective of this study was to establish a relationship between odour intensity assessed by the Nasal Ranger technique and odour concentration measured with olfactometers.

Odour Production, Evaluation and Control (MLMMI 02-HERS-03) Full Report [525 KB pdf] - One of the greatest obstacles to the advancement of odour management is the difficulty of measuring odour itself. Olfactometers are only capable of measuring the odour concentration. The electronic nose (e-nose) technology has the potential of measuring both quality and quantity of odour. Research is needed to correlate human perceptions of odours to e-nose measurements and to develop portable e-noses for field measurements of odour.

Odour Generating Bacteria in Swine Manure and Composted Swine Manure Identification by Molecular Techniques  (MLMMI 02-01-11) Full Report [40 KB pdf] - This project has increased understanding of the microbiology occurring in swine manure by identifying many species of bacteria which are common in manure. The techniques used to identify these bacteria have just begun to be used in this type of microbiology and should provide much information in the future.


Pit Additives

Anti-Pollutant Bio-Stimulant For odor Control & Waste Management. EcoChem Organics, Box 1388, Hanna, Alberta TOJ 1PO; Tel: (403) 854-3617 - There are three general types of chemical compounds that claim to reduce odor in animal manure: (1) masking agents designed to override offensive odor; (2) compounds designed to block the sensing of odor and (3) odor absorption chemicals that react with manure to reduce odor. CBPA does NOT fit any of these profiles. CBPA is a liquid, organic proprietary blend of selected natural beneficial microorganisms, essential nutrients and synergists formulated for odor abatement and manure management applications. The components in CBPA are selected both for their effectiveness in organic waste treatment and for their ability to grow synergistically to high concentrations. CBPA is effective in aqueous or non-aqueous facultative environments.

Laboratory Testing of Commercial Manure Additives for Swine Odor Control (648 KB pdf)- Dr. Albert J. Heber, et al, Agricultural and Biological Engineering Department, Purdue Univ. (Jan 25, 2001) - Thirty-five manure storage pit additive products were evaluated by the Purdue University Agricultural Air Quality Laboratory in an experiment supported by the National Pork Board. Vendors voluntarily submitted their products to a well-defined evaluation protocol.

Evaluation of Commercial Manure Additives  [78 KB pdf] (Oct. 1, 1997) Jack Johnson, Agricultural Utilization Research Institute (AURI), PO Box 251, Waseca, MN 56093 - The objective of the project was not to test one product versus another product for effectiveness on odor reduction. Rather, the objective was to evaluate manure treatment products versus an untreated control barn on the same site under identical production conditions.

Effectiveness of Three Manure Pit Additives in Commercial Scale Manure Channels and Simulated Outdoor Storage. R. Stinson1, S.P. Lemay1, E.M. Barber2and T. Fonstad3 . 1Prairie Swine Centre Inc., Saskatoon, SK;  2U. of Sask., Saskatoon ,SK ; 3 Dept of Agricultural & Bioresource Eng., U. of Sask. -  The effectiveness of three manure pit additives was evaluated in commercial scale channels and simulated outdoor storage with grower-finisher pig manure. The additives were American BioCatalysts, Pit Boss and Westbridge (H4-5O2).

Effectiveness of Manure Additives [1069  KB pdf] (1992) Naveen Patni, Centre for Food and Animal Research, Agriculture & Agri-Food Canada, Ottawa - A study was conducted at Agriculture Canada's Centre for Food and Animal Research in Ottawa to determine the effectiveness of a few manure additives to control the production of known odorous chemicals, to retain nitrogen and organic matter, and to improve the ease of flow of stored swine manure slurry.

Penergetic-g for pig slurry and liquid manure [764 KB pdf]; Dairy Farm Application [511 KB pdf] - An additive that promotes homogenization of manure slurry and reduces odours - Penergetic-g slurry treatment (dairy), Penergetic-g special slurry treatment (pig), Penergetic-k (dry manure/compost).- Contact: Heather Pratt, Penergetic Canada, Ste 329 West Blvd., Vancouver BC V6M 3W6; Tel: 604-736-0907.



Bruce T. Bowman, Archivist
Last Updated: Thursday, July 26, 2018 01:12:54 PM