scholarly journals Mitigation of Gaseous Emissions from Stored Swine Manure with Biochar: Effect of Dose and Reapplication on a Pilot-Scale

Atmosphere ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 96
Author(s):  
Baitong Chen ◽  
Jacek A. Koziel ◽  
Chumki Banik ◽  
Hantian Ma ◽  
Myeongseong Lee ◽  
...  
Keyword(s):  
Rural Communities ◽  
Statistical Significance ◽  
Swine Manure ◽  
Pilot Scale ◽  
Practical Significance ◽  
Gaseous Emissions ◽  
Percentage Reduction ◽  
Significant Percentage ◽  
Improved Performance ◽  
The One

Rural communities are affected by gaseous emissions from intensive livestock production. Practical mitigation technologies are needed to minimize emissions from stored manure and improve air quality inside barns. In our previous research, the one-time surficial application of biochar to swine manure significantly reduced emissions of NH3 and phenol. We observed that the mitigation effect decreased with time during the 30-day trials. In this research, we hypothesized that bi-weekly reapplication of biochar could improve the mitigation effect on a wider range of odorous compounds using a larger scale and longer trials. The objective was to evaluate the effectiveness of biochar dose and reapplication on mitigation of targeted gases (NH3, odorous, volatile organic compounds VOCs, odor, greenhouse gases (GHG)) from stored swine manure on a pilot-scale setup over 8-weeks. The bi-weekly reapplication of the lower biochar dose (2 kg/m2) showed much higher significant percentage reductions in emissions for NH3 (33% without and 53% with reapplication) and skatole (42% without and 80% with reapplication), respectively. In addition, the reapplication resulted in the emergence of a statistical significance to the mitigation effect for all other targeted VOCs. Specifically, for indole, the percentage reduction improved from 38% (p = 0.47, without reapplication) to 78% (p = 0.018, with reapplication). For phenol, the percentage reduction improved from 28% (p = 0.71, without reapplication) to 89% (p = 0.005, with reapplication). For p-cresol, the percentage reduction improved from 31% (p = 0.86, without reapplication) to 74% (p = 0.028, with reapplication). For 4-ethyl phenol, the percentage emissions reduction improved from 66% (p = 0.44, without reapplication) to 87% (p = 0.007, with reapplication). The one-time 2 kg/m2 and 4 kg/m2 treatments showed similar effectiveness in mitigating all targeted gases, and no statistical difference was found between the dosages. The one-time treatments showed significant percentage reductions of 33% and 42% and 25% and 48% for NH3 and skatole, respectively. The practical significance is that the higher (one-time) biochar dose may not necessarily result in improved performance over the 8-week manure storage, but the bi-weekly reapplication showed significant improvement in mitigating NH3 and odorous VOCs. The lower dosages and the frequency of reapplication on the larger-scale should be explored to optimize biochar treatment and bring it closer to on-farm trials.

scholarly journals Mitigation of Gaseous Emissions from Stored Swine Manure with Biochar: Effect of Dose and Reapplication on A Pilot-Scale

2020 ◽  
Author(s):  
Baitong Chen ◽  
Jacek A. Koziel ◽  
Chumki Banik ◽  
Hantian Ma ◽  
Myeongseong Lee ◽  
...  
Keyword(s):  
Rural Communities ◽  
Statistical Significance ◽  
Swine Manure ◽  
Pilot Scale ◽  
Practical Significance ◽  
Gaseous Emissions ◽  
Manure Storage ◽  
Improved Performance ◽  
The One ◽  
On Farm

The rural communities are affected by gaseous emissions from intensive livestock production. Practical mitigation technologies are needed to minimize emissions from stored manure and improve air quality inside barns. In our previous research, the one-time surficial application of biochar to swine manure significantly reduced emissions of NH3 and phenol. We observed that the mitigation effect decreased with time during the 30-day trials. In this research, we hypothe-sized that bi-weekly reapplication of biochar could improve the mitigation effect on a wider range of odorous compounds using larger scale and longer trials. The objective was to evaluate the effectiveness of biochar dose and reapplication on mitigation of targeted gases (NH3, odor-ous VOCs, odor, GHGs) from stored swine manure on a pilot-scale setup over 8-weeks. The bi-weekly reapplication of the lower biochar dose (2 kg/m2) showed much higher significant percent reductions of emissions for NH3 (33% without & 53% with reapplication) and skatole (42% without & 80% with reapplication), respectively. In addition, the reapplication resulted in the emergence of statistical significance to the mitigation effect for all other targeted VOCs. Spe-cifically, for indole, the % reduction improved from 38% (p=0.47, without reapplication) to 78% (p=0.018, with reapplication). For phenol, the % reduction improved from 28% (p=0.71, without reapplication) to 89% (p=0.005, with reapplication). For p-cresol, the % reduction improved from 31% (p=0.86, without reapplication) to 74% (p=0.028, with reapplication). For 4-ethyl phenol, the percent emissions reduction improved from 66% (p=0.44, without reapplication) to 87% (p=0.007, with reapplication). The one-time 2 kg/m2 and 4 kg/m2 treatments showed similar effectiveness in mitigating all targeted gases, and no statistical difference was found between the dosages. The one-time treatments showed significant % reductions of 33% & 42% and 25% & 48% for NH3 and skatole, respectively. The practical significance is that the higher (one-time) biochar dose may not necessarily result in improved performance over the 8-week manure storage, but the bi-weekly reapplication showed significant improvement in mitigating NH3 and odorous VOCs. The lower dosages and the frequency of reapplication on the larger-scale should be explored to optimize biochar treatment and bring it closer to on-farm trials.

scholarly journals Evaluation of TiO2 Based Photocatalytic Treatment of Odor and Gaseous Emissions From Swine Manure With UV-A and UV-C

2021 ◽  
Author(s):  
Myeongseong Lee ◽  
Jacek A. Koziel ◽  
Wyatt Murphy ◽  
William S. Jenks ◽  
Baitong Chen ◽  
...  
Keyword(s):  
Rural Communities ◽  
Treatment Effectiveness ◽  
Swine Manure ◽  
Pilot Scale ◽  
Gaseous Emissions ◽  
Uv Treatment ◽  
Uv Dose ◽  
Economic Analyses ◽  
Uv Technology ◽  
Uv C

It is essential to mitigate gaseous emissions that result from poultry and livestock production to increase industry sustainability. Odorous volatile organic compounds (VOCs), ammonia (NH3), hydrogen sulfide (H2S), and greenhouse gases (GHGs) have detrimental effects on the quality of life in rural communities, the environment, and climate. This study's objective was to evaluate the photocatalytic UV treatment of gaseous emissions of odor, odorous VOCs, NH3, and other gases (GHGs, O3 – sometimes considered as by-products of UV treatment) from stored swine manure on a pilot-scale. The manure emissions were treated in fast-moving air using a mobile lab equipped with UV-A and UV-C lights and TiO2-based photocatalyst. Treated gas airflow (0.25 to 0.76 m3/s) simulates output from a small ventilation fan in a barn. Through controlling the light intensity and airflow, UV dose was tested for techno-economic analyses. The treatment effectiveness depended on the UV dose and wavelength. Under UV-A (367 nm) photocatalysis, the percent reduction of targeted gases was up to i) 63% of odor, ii) 51%, 51%, 53%, 67%, and 32% of acetic acid, propanoic acid, butanoic acid, p-cresol, and indole, respectively, iii) 14% of nitrous oxide (N2O), iv) 100% of O3, and 26% generation of CO2. Under UV-C (185+254 nm) photocatalysis, the percent reductions of target gases were up to i) 54% and 47% for p-cresol and indole, respectively, ii) 25% of N2O, iii) 71% of CH4, and 46% & 139% generation of CO2 & O3, respectively. The results proved that the UV technology was sufficiently effective in treating odorous gases, and the mobile lab was ready for farm-scale trials. The UV technology can be considered for the scaled-up treatment of emissions and air quality improvement inside livestock barns.

scholarly journals Evaluation of TiO2 Based Photocatalytic Treatment of Odor and Gaseous Emissions from Swine Manure with UV-A and UV-C

Animals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 1289
Author(s):  
Myeongseong Lee ◽  
Jacek A. Koziel ◽  
Wyatt Murphy ◽  
William S. Jenks ◽  
Baitong Chen ◽  
...  
Keyword(s):  
Rural Communities ◽  
Treatment Effectiveness ◽  
Swine Manure ◽  
Pilot Scale ◽  
Gaseous Emissions ◽  
Uv Treatment ◽  
Uv Dose ◽  
Economic Analyses ◽  
Uv Technology ◽  
Uv C

It is essential to mitigate gaseous emissions that result from poultry and livestock production to increase industry sustainability. Odorous volatile organic compounds (VOCs), ammonia (NH3), hydrogen sulfide (H2S), and greenhouse gases (GHGs) have detrimental effects on the quality of life in rural communities, the environment, and climate. This study’s objective was to evaluate the photocatalytic UV treatment of gaseous emissions of odor, odorous VOCs, NH3, and other gases (GHGs, O3—sometimes considered as by-products of UV treatment) from stored swine manure on a pilot-scale. The manure emissions were treated in fast-moving air using a mobile lab equipped with UV-A and UV-C lights and TiO2-based photocatalyst. Treated gas airflow (0.25–0.76 m3∙s−1) simulates output from a small ventilation fan in a barn. Through controlling the light intensity and airflow, UV dose was tested for techno-economic analyses. The treatment effectiveness depended on the UV dose and wavelength. Under UV-A (367 nm) photocatalysis, the percent reduction of targeted gases was up to (i) 63% of odor, (ii) 51%, 51%, 53%, 67%, and 32% of acetic acid, propanoic acid, butanoic acid, p-cresol, and indole, respectively, (iii) 14% of nitrous oxide (N2O), (iv) 100% of O3, and 26% generation of CO2. Under UV-C (185 + 254 nm) photocatalysis, the percent reductions of target gases were up to (i) 54% and 47% for p-cresol and indole, respectively, (ii) 25% of N2O, (iii) 71% of CH4, and 46% and 139% generation of CO2 and O3, respectively. The results proved that the UV technology was sufficiently effective in treating odorous gases, and the mobile lab was ready for farm-scale trials. The UV technology can be considered for the scaled-up treatment of emissions and air quality improvement inside livestock barns. Results from this study are needed to inform the experimental design for future on-farm research with UV-A and UV-C.

scholarly journals Mitigation of Odor, NH3, H2S, GHG, and VOC Emissions With Current Products for Use in Deep-Pit Swine Manure Storage Structures

2020 ◽  
Vol 8 ◽  
Author(s):  
Baitong Chen ◽  
Jacek A. Koziel ◽  
Chumki Banik ◽  
Hantian Ma ◽  
Myeongseong Lee ◽  
...  
Keyword(s):  
Swine Manure ◽  
Pilot Scale ◽  
Scientific Data ◽  
Gaseous Emissions ◽  
Factors Affecting ◽  
Deep Pit ◽  
Wide Range ◽  
Manure Storage ◽  
User Friendly ◽  
Storage Structures

Odorous gas emissions from swine production have been a concern for neighbors and communities near livestock farms. Manure storage is one of the main sources of gaseous emissions. Manure additive products are marketed as a simple solution to this environmental challenge. Manure additives are user-friendly for producers and can be applied (e.g., periodically poured into manure) without changing the current manure storage structure. Little scientific data exist on how these products perform in mitigating gaseous emissions from swine manure. The research objective was to evaluate the effectiveness of 12 marketed manure additives on mitigating odor, ammonia (NH3), hydrogen sulfide (H2S), greenhouse gases (GHG), and odorous volatile organic compounds (VOCs) from stored swine manure. A controlled pilot-scale setup was used to conduct 8-week long trials using manufacturer-prescribed dosages of additives into swine manures. Manure was outsourced from three swine farms to represent a variety of manure storage types and other factors affecting the properties. Measured gaseous emissions were compared between the treated and untreated manure. None of the tested products showed a significant reduction in gaseous emissions when all (n = 3) manures were treated as replicates. Selected products showed a wide range of statistically-significant reduction and generation of gaseous emissions when emissions were compared in pairs of manure types from one farm. The latter observation highlighted the lack of consistent mitigation of gaseous emissions by manure additives. The results of this study do not warrant full-scale trials with the tested products.

scholarly journals Emissions from Swine Manure Treated with Current Products for Mitigation of Odors and Reduction of NH3, H2S, VOC, and GHG Emissions

Data ◽  
2020 ◽  
Vol 5 (2) ◽  
pp. 54 ◽  
Author(s):  
Baitong Chen ◽  
Jacek A. Koziel ◽  
Chumki Banik ◽  
Hantian Ma ◽  
Myeongseong Lee ◽  
...  
Keyword(s):  
Swine Manure ◽  
Ghg Emissions ◽  
Pilot Scale ◽  
Storage Conditions ◽  
Performance Comparison ◽  
Scientific Data ◽  
Gaseous Emissions ◽  
Swine Industry ◽  
The Public ◽  
Ch4 And N2o

Odor and gaseous emissions from the swine industry are of concern for the wellbeing of humans and livestock. Additives applied to the swine manure surface are popular, marketed products to solve this problem and relatively inexpensive and easy for farmers to use. There is no scientific data evaluating the effectiveness of many of these products. We evaluated 12 manure additive products that are currently being marketed on their effectiveness in mitigating odor and gaseous emissions from swine manure. We used a pilot-scale system simulating the storage of swine manure with a controlled ventilation of headspace and periodic addition of manure. This dataset contains measured concentrations and estimated emissions of target gases in manure headspace above treated and untreated swine manure. These include ammonia (NH3), hydrogen sulfide (H2S), greenhouse gases (CO2, CH4, and N2O), volatile organic compounds (VOC), and odor. The experiment to test each manure additive product lasted for two months; the measurements of NH3 and H2S were completed twice a week; others were conducted weekly. The manure for each test was collected from three different farms in central Iowa to provide the necessary variety in stored swine manure properties. This dataset is useful for further analyses of gaseous emissions from swine manure under simulated storage conditions and for performance comparison of marketed products for the mitigation of gaseous emissions. Ultimately, swine farmers, the regulatory community, and the public need to have scientific data informing decisions about the usefulness of manure additives.

Anaerobic Digestion of Swine Manure in Conventional and Hybrid Pilot Scale Plants: Performance and Gaseous Emissions Reduction

2009 ◽  
Author(s):  
Roberto Chiumenti ◽  
Alessandro Chiumenti ◽  
Francesco da Borso ◽  
Sonia Limina ◽  
Antonio Landa
Keyword(s):  
Anaerobic Digestion ◽  
Swine Manure ◽  
Pilot Scale ◽  
Emissions Reduction ◽  
Gaseous Emissions

scholarly journals Low prevalence of active trachoma and associated factors among children aged 1–9 years in rural communities of Metema District, Northwest Ethiopia: a community based cross-sectional study

2021 ◽  
Vol 47 (1) ◽  
Author(s):  
Kessete Ayelgn ◽  
Tadesse Guadu ◽  
Atalay Getachew
Keyword(s):  
Rural Communities ◽  
Associated Factors ◽  
Statistical Significance ◽  
Cross Sectional Study ◽  
Northwest Ethiopia ◽  
Sectional Study ◽  
Community Based ◽  
Cross Sectional ◽  
Active Trachoma ◽  
Study Participants

Abstract Background Trachoma is an infectious disease of the eye caused by Chlamydia trachomatis and transmitted via contact with eye discharge from infected persons and leading to blindness worldwide. Children less than 9 years of age affected more seriously. The disease is common where access to water and sanitation are limited. Objective To determine the prevalence of active trachoma and associated factors among children aged 1–9 years in rural communities of Metema District, West Gondar Zone, Northwest Ethiopia. Method A community based cross-sectional study design was used to collect data from 792 children aged 1–9 years old in Metema district from April to May 2018. Multistage sampling technique was used to select the study participants. Pretested interviewer-administered structured questionnaire and eye examination using binocular loupe to differentiate trachoma cases was the data collection methods and tools. The bivariable and multivariable binary logistic regression model was employed for analysis. P-value < 0.05 was considered to declare statistical significance. Results A total of 752 children aged l-9 years were enrolled in this study with response rate of 94.9%. The overall prevalence of active trachoma among the study participants was 11.8% (95% CI, 9.5–13.9). Unprotected source of water (AOR = 4.7; 95% CI: 2.5–8.9), lower household water consumption (AOR = 2.8; 95% CI: 1.3–6.0), improper latrine utilization (AOR = 3.2; 95% CI: 1.5–6.7), and frequency of face washing once per day (AOR = 5.3; 95% CI: 1.2–26.6) were the factors significantly associated with active trachoma. Conclusion The current study revealed a lower overall prevalence of active trachoma (11.8%) than the WHO threshold prevalence (20%) used to declare it as a severe public health problem. All residents and health professional should collaborate on trachoma prevention by implementing the WHO SAFE strategy- surgery for trichiasis, antibiotics, facial cleanliness and environmental improvement for further trachoma elimination.

scholarly journals Two-Segment Foot Model for the Biomechanical Analysis of Squat

2017 ◽  
Vol 2017 ◽  
pp. 1-11
Author(s):  
E. Panero ◽  
L. Gastaldi ◽  
W. Rapp
Keyword(s):  
Body Weight ◽  
Inverse Dynamics ◽  
Statistical Significance ◽  
Lower Limbs ◽  
Biomechanical Analysis ◽  
Wide Range ◽  
Foot Model ◽  
Partial Body ◽  
The One ◽  
Midtarsal Joint

Squat exercise is acquiring interest in many fields, due to its benefits in improving health and its biomechanical similarities to a wide range of sport motions and the recruitment of many body segments in a single maneuver. Several researches had examined considerable biomechanical aspects of lower limbs during squat, but not without limitations. The main goal of this study focuses on the analysis of the foot contribution during a partial body weight squat, using a two-segment foot model that considers separately the forefoot and the hindfoot. The forefoot and hindfoot are articulated by the midtarsal joint. Five subjects performed a series of three trials, and results were averaged. Joint kinematics and dynamics were obtained using motion capture system, two force plates closed together, and inverse dynamics techniques. The midtarsal joint reached a dorsiflexion peak of 4°. Different strategies between subjects revealed 4° supination and 2.5° pronation of the forefoot. Vertical GRF showed 20% of body weight concentrated on the forefoot and 30% on the hindfoot. The percentages varied during motion, with a peak of 40% on the hindfoot and correspondently 10% on the forefoot, while the traditional model depicted the unique constant 50% value. Ankle peak of plantarflexion moment, power absorption, and power generation was consistent with values estimated by the one-segment model, without statistical significance.

Co-composting of food waste and swine manure augmenting biochar and salts: Nutrient dynamics, gaseous emissions and microbial activity

2021 ◽  
pp. 126300
Author(s):  
Balasubramani Ravindran ◽  
Mukesh Kumar Awasthi ◽  
Natchimuthu Karmegam ◽  
Soon Woong Chang ◽  
Dhiraj Kumar Chaudhary ◽  
...  
Keyword(s):  
Microbial Activity ◽  
Food Waste ◽  
Nutrient Dynamics ◽  
Swine Manure ◽  
Gaseous Emissions

scholarly journals The Other Half of the Story: Effect Size Analysis in Quantitative Research

2013 ◽  
Vol 12 (3) ◽  
pp. 345-351 ◽  
Author(s):  
Jessica Middlemis Maher ◽  
Jonathan C. Markey ◽  
Diane Ebert-May
Keyword(s):  
Educational Research ◽  
Effect Size ◽  
Quantitative Research ◽  
Statistical Significance ◽  
The Other ◽  
Practical Significance ◽  
Significance Testing ◽  
Size Analysis ◽  
Significance Tests ◽  
Statistical Significance Testing

Statistical significance testing is the cornerstone of quantitative research, but studies that fail to report measures of effect size are potentially missing a robust part of the analysis. We provide a rationale for why effect size measures should be included in quantitative discipline-based education research. Examples from both biological and educational research demonstrate the utility of effect size for evaluating practical significance. We also provide details about some effect size indices that are paired with common statistical significance tests used in educational research and offer general suggestions for interpreting effect size measures. Finally, we discuss some inherent limitations of effect size measures and provide further recommendations about reporting confidence intervals.

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