Pit Manure additives study results

By Purdue University - 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.

Each product was tested three times (42 days each replicate) in an enclosed 15-inch diameter by 48- inch tall manure storage reactor. Product effectiveness was determined by comparing odor, hydrogen sulfide, and ammonia measurements in treated reactors against measurements in untreated reactors.

Manure characteristics were evaluated at the beginning and end of each trial. Each product summary includes a manufacturer/marketer product description, the method and rate of application of these products to the manure storage pits, any unique application instructions needed to calculate the amount of product to be applied, and the current retail price.

The product tables list parameters measured in the manure or the airspace (headspace) above the manure surface. The table heading of least squares mean and standard error is the statistical average of the three replicate measurements.

The graphs shown for each product represent odor dilution threshold (ODT) and hydrogen sulfide (H2S). ODT, the best measure of odor, was measured on four (4) separate days during each replicate. H2S was measured several times a day throughout the 42-day replicates. Each graph displays the product’s ODT or H2S value difference from the untreated manure value for each of the three replicates. The x-axis of the graph represents the day of sampling.

Each line on the graph represents the difference between treated and untreated manure in the corresponding replicate of testing. The y-axis provides the measure of difference, calculated as treated concentration minus untreated concentration. A negative value indicates a decrease in concentration from the untreated reactor levels. A positive value indicates an increase in concentration above untreated reactor levels.

Statistical analysis provides measures of probability of differences in product activity. The comparison of interest is between untreated manure reactors and the product reactors. While scientists regularly use a 95% probability of success to declare product activity, many producers would be willing to make a decision from 75% probability of success.

Results are reported at both levels of certainty, 95% and 75%. Each product summary table lists the degree of certainty and in what direction (increase or decrease) the treated manure was different from the untreated manure. Also presented is the percent (%) change in product response compared to the control. Listed below are those products that were found to have either a 95% or 75% level of certainty that odor dilution threshold, hydrogen sulfide and ammonia would be decreased under these testing procedures as a result of the product treatment.

Odor Dilution Threshold

95% Certainty of Decrease

None of the products tested decreased odor dilution threshold at this level of certainty.

75% Certainty of Decrease

Alken Clear-Flo®	see page 43
Biological Manure Treatment (BMT)	see page 55
Super Microbial Odor Control (SMOC)	see page 155
Zymplex.	see page 167

Headspace Hydrogen Sulfide Concentration

95% Certainty of Decrease

Alken Clear-Flo®	see page 43
Biocharge Dry	see page 51
GT-2000OC & BC-2000AF	see page 75
INHIBODOR®	see page 79
Roebic Odor Eliminator (ROE)	see page 143
Super Microbial Odor Control (SMOC)	see page 155
Zymplex	see page 167

75% Certainty of Decrease

MBA-S	see page 99
PS1	see page 135
UC-40™ Microbe Formula	see page 159

Headspace Ammonia Concentration

95% Certainty of Decrease

AgriKlenz Plus	see page 39
AWL-80	see page 47
Biocharge Dry	see page 51
Biological Manure Treatment (BMT)	see page 55
EM Waste Treatment	see page 71
Krystal Air™	see page 87
Manure Management Plus ™	see page 95
Peroxy Odor Control	see page 127

75% Certainty of Decrease

Agricycle™ & Microcycle™	see page 35
Digest 54 Plus	see page 67
MBA-S	see page 99
N-P 50	see page 119

This table shows the degree of certainty that products were successful in decreasing odor, H2S, and NH3 during Testing.
Product Name	Decreases Odor (ODT)		Decreases Hydrogen Sulphide H2S		Decreases Ammonia NH3		see page
	Decrease %	Certainty %	Decrease %	Certainty %	Decrease %	Certainty %
Agri-Clean							31
Agricycle™					3%	75%	35
AgriKlenz Plus					6%	95%	39
Alken Clear-Flo®	27%	75%	47%	95%			43
AWL-80					10%	95%	47
Biocharge Dry	37%	95%			7%	95%	51
Biological Manure Treatment	25%	75%			5%	95%	55
BIO-MAX Biosystem							59
Conserve-N							63
Digest 54 Plus					2%	75%	67
EM Waste Treatment					15%	95%	71
GT-1000OC & BC-2000AF			34%	95%			75
INHIBODOR®			36%	95%			79
KOPROS®							83
Krystal Air™					7%	95%	87
Lagoon Aid							91
Manure Management Plus™					6%	95%	95
MBA-S			19%	75%	3%	75%	99
MICROBE-LIFT							103
MUNOX®							107
M2 Acid Buffer							111
Nature’s Key Pit & Lagoon Treatment™							115
N-P 50					3%	75%	119
OdorKlenz BMT							123
Peroxy Odor Control					3%	95%	127
Pit Remedy							131
PS1			14%	75%			135
Roebic Manure Liquefier							139
Roebic Odor Eliminator			23%	95%			143
SEPTI-SOL							147
Solmar AW-509							151
Super Microbial Odor Control (SMOC)	32%	75%	37%	95%			155
UC-40™ Microbe Formula			15%	75%			159
X12							163
Zymplex	28%	75%	27%	95%			167

To view the whole 197 page pdf report Click Here

Source: US National Pork Board - January 2001

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