A review of ammonia emission mitigation techniques for concentrated animal feeding operations

Ndegwa, Pius M.; Hristov, A.N.; Arogo, J.; Sheffield, Ronald E.

doi:10.1016/j.biosystemseng.2008.05.010

Cited by 248 publications

(183 citation statements)

References 127 publications

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“…Therefore livestock producers are concerned about developing new methods and technologies to meet regulatory requirements and maintain good environmental standards. For instance, strategies for ammonia reduction includes renovation of barns, change in animal nutrition, regular cleaning of exhaust air from farm structures and proper manure treatment (Ndegwa et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Influence of pH on hydrothermal treatment of swine manure: Impact on extraction of nitrogen and phosphorus in process water

Ekpo

Ross

Camargo‐Valero

et al. 2016

Bioresource Technology

177

105

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This study investigates the influence of pH on extraction of nitrogen and phosphorus from swine manure following hydrothermal treatment. Conditions include thermal hydrolysis (TH) at 120°C and 170°C, and hydrothermal carbonisation (HTC) at 200°C and 250°C in either water alone or in the presence of 0.1M NaOH, H2SO4, CH3COOH or HCOOH. Phosphorus extraction is pH and temperature dependent and is enhanced under acidic conditions. The highest level of phosphorus is extracted using H2SO4 reaching 94% at 170°C. The phosphorus is largely retained in the residue for all other conditions. The extraction of nitrogen is not as significantly influenced by pH, although the maximum N extraction is achieved using H2SO4. A significant level of organic-N is extracted into the process waters following hydrothermal treatment. The results indicate that operating hydrothermal treatment in the presence of acidic additives has benefits in terms of improving the extraction of phosphorus and nitrogen.

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Section: Introductionmentioning

confidence: 99%

Influence of pH on hydrothermal treatment of swine manure: Impact on extraction of nitrogen and phosphorus in process water

Ekpo

Ross

Camargo‐Valero

et al. 2016

Bioresource Technology

177

105

View full text Add to dashboard Cite

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“…In the United States, one of the main methods used to improve the indoor air quality of poultry houses and, indirectly, to enhance the fertilizing value of poultry litter is the use of chemical additives (Ndegwa et al, 2008). Currently, the most effective products seem to be those that react chemically to lower the pH of the litter, usually metal salts.…”

Section: Introductionmentioning

confidence: 99%

Effect of aluminum sulfate on litter composition and ammonia emission in a single flock of broilers up to 42 days of age

Sánchez

López

Valverde

et al. 2012

Animal

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New alternatives are necessary if the environmental impact linked to intensive poultry production is to be reduced, and different litter handling methods should be explored. Among these, acidifying amendments added to poultry litters has been suggested as a management practice to help reduce the potential environmental effect involved in multiple flock cycles. There have been several studies on the use of aluminum sulfate (alum) and its benefits, but almost no data are available under farm conditions in Europe. An experiment with Ross 308 broilers from 1 to 42 days of age was conducted to evaluate the effect of alum on litter composition, the solubility of some mineral elements and NH3emission during a single flock-rearing period in commercial houses located in southeast Spain. Broilers were placed on clean wood shavings in four commercial houses, containing 20 000 broilers each. Before filling, alum was applied at a rate of 0.25 kg/m2to the wood shavings of two poultry houses, whereas the remaining two were used as control. Litter from each poultry house was sampled every 3 to 5 days. Ammonia emissions from the poultry houses were monitored from 37 to 42 days of age. In comparison with the control group, alum treatment significantly reduced the pH level of the litter (P< 0.001) with an average difference of 1.32 ± 0.24 units. Alum-treated litter showed, on average, a higher electrical conductivity than the control litter (5.52v.3.63 dS/m). The dry matter (DM) and total N and P contents did not show differences between the treatments (P> 0.05). Regarding the NH4+-N content, alum-treated litter showed a higher value than the untreated litter, with an average difference of 0.16 ± 0.07% (on a DM basis). On average, alum-treated litter had lower water-soluble P, Zn and Cu contents than the untreated litter. Alum noticeably reduced the in-house ammonia concentration (P< 0.001), with an average of 4.8 ppm at 42 days of age (62.9% lower than the control), and ammonia emissions from 37 to 42 days of age were significantly reduced by the alum treatment (P< 0.001), representing a reduction of 73.3%. The lower pH values might have reduced ammonia volatilization from the litter, with a corresponding positive effect on the building environment and poultry health. For these reasons, litter amendment with alum could be recommended as a way of reducing the pollution potential of European broiler facilities during a single flock cycle.

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“…Ammonia emission and deposition leads to progressive soil acidification and, together with hydrogen sulphide, is also responsible for significant odour impact (Ndegwa et al, 2008). Indoors, ammonia is a notorious irritating gas that results in adverse effects on production, health and welfare.…”

Section: Introductionmentioning

confidence: 99%

Effect of Bacillus spp. direct-fed microbial on slurry characteristics and gaseous emissions in growing pigs fed with high fibre-based diets

Prenafeta-Boldú¹,

Fernández²,

Viñas³

et al. 2017

Animal

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A 26-day trial with 18 Pietrain × (Landrace × Duroc) pigs was conducted to investigate the effect of two dose levels of a specifically selected Bacillus spp. direct-fed microbial (DFM) product, on the emission of environmentally harmful gasses (methane, ammonia and hydrogen sulphide) from manure. Pigs were assigned to one of three treatments in a randomized complete block design according to their sex and initial BW. Each treatment contained three replications with two pigs per pen. The test treatments included a Bacillus spp. DFM containing 3 × 10 8 colony-forming unit/g, added at a low (250 mg/kg) and high (500 mg/kg) dose to an antibiotic free high fibre-based diet, and a non-supplemented control diet. Manure from pigs fed with the supplemented diets emitted lower amounts of atmospheric contaminants. The most significant reduction was observed with low DFM supplementation, in which methane and ammonia volatilization decreased ( P < 0.05) by >40% and 50%, respectively, on fresh weight basis in relation to the control. Microbiome analysis of manure by high through put sequencing techniques on eubacterial and archaeal 16S rRNA genes highlighted the complex interactions between indigenous gut microflora and inoculated Bacillus spp. The tested Bacillus DFM could be considered as a best available technique in reducing the environmental impacts of growing pigs fed with high fibre-based diets.

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A review of ammonia emission mitigation techniques for concentrated animal feeding operations

Cited by 248 publications

References 127 publications

Influence of pH on hydrothermal treatment of swine manure: Impact on extraction of nitrogen and phosphorus in process water

Influence of pH on hydrothermal treatment of swine manure: Impact on extraction of nitrogen and phosphorus in process water

Effect of aluminum sulfate on litter composition and ammonia emission in a single flock of broilers up to 42 days of age

Effect of Bacillus spp. direct-fed microbial on slurry characteristics and gaseous emissions in growing pigs fed with high fibre-based diets

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