Sludge management in anaerobic swine lagoons: A review

Owusu-Twum, Maxwell Y.; Sharara, Mahmoud

doi:10.1016/j.jenvman.2020.110949

Cited by 27 publications

(12 citation statements)

References 74 publications

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“…Dairy farmers can earn carbon credits by lowering gas emissions, odors, and other volatile organic compounds. Approaches to mitigate gas emissions during manure treatment and storage include proper design and sizing of storage structures (Aboltins et al., 2017); use of lagoon covers (Dougherty et al., 2017; VanderZaag et al., 2008); avoiding aeration and agitation (Rumburg et al., 2004; Owusu‐Twum & Sharara, 2020); energy recovery (Cantrell et al., 2008; Yarberry et al., 2019); use of chemical processes, such as NH 3 stripping and struvite precipitation (Arogo et al., 2006; Vendramelli et al., 2017); segregating manure and urine to reduce the contact of enzymes in the feces with the urea (Ndegwa et al., 2008); and acidifying of the manure (Cao et al., 2020; Sokolov et al., 2019). Approaches like proper design and sizing, avoiding aeration and agitation, and acidifying manure cannot solely mitigate emissions and should be used in combinations.…”

Section: Introductionmentioning

confidence: 99%

Efficacy of a vermifilter at mitigating greenhouse gases and ammonia emissions from dairy wastewater

et al. 2022

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Dairy effluent is a potential source of gaseous pollutants associated with global warming and soil acidification. Mitigating such emissions during handling and storage requires substantial financial and labor input. This study evaluated a low‐cost technology for mitigating gaseous emissions from dairy wastewater. For 9 mo, a pilot‐scale vermifilter system installed on a commercial dairy farm was studied. Bimonthly samples of the dairy wastewater influent and effluent from the vermifilter system were collected. These samples’ potential gas emissions (ammonia [NH3], methane [CH4], carbon dioxide [CO2], and nitrous oxide [N2O]) were measured using a closed‐loop dynamic flux chamber method. Results indicated the following reductions in emissions of these gases by the vermifilter system: 84–100% for NH3, 58–82% for CO2, and 95–100% for CH4. Nitrous oxide emissions were mainly below our instrument detection limits and were thus not reported. The vermifilter showed the potential of reducing the global warming potential from the dairy wastewater by up to 100%. This study further indicated that higher ambient temperatures led to higher emissions of CH4 (R2 = .56) and NH3 (R2 = .53) from untreated dairy wastewater. Overall, the vermifilter system has potential to mitigate gaseous emissions from dairy wastewater.

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Section: Introductionmentioning

confidence: 99%

Efficacy of a vermifilter at mitigating greenhouse gases and ammonia emissions from dairy wastewater

et al. 2022

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“…Swine manure generally contains high levels of organic matter, nutrients, and pathogens, and thus can be considered as a point source of nutrients from agriculture, as well as a source of nonpoint pollution via runoff and seepage to nearby waterbodies. Traditional treatment methods primarily focus on removing solid contents via sedimentation and anaerobic digestion in lagoons for subsequent disposal [1,2]. However, lagoon supernatants contain high levels of biological contaminants [3] and are often used to irrigate crops or discharged into adjacent streams, which indirectly or directly threatens fragile aquatic systems.…”

Section: Introductionmentioning

confidence: 99%

A Sustainable and Low-Cost Soil Filter Column for Removing Pathogens from Swine Wastewater: The Role of Endogenous Soil Protozoa

Kim¹,

Yan²,

Yost³

et al. 2021

Water

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The increase of swine production in the Pacific Islands has inevitably led to environmental pollution concerns from discharged wastewater derived from both washing and manure. The slurry accumulates in lagoons, where supernatant wastewater containing high levels of pathogens and nutrients becomes nonpoint source water pollution that deteriorates the quality of receiving water bodies. Soil filtration is a promising cost-effective technology for removing pollutants from swine wastewater; however, the excessive growth of bacteria in soil media often accompanies the filtration process. This study investigates soil filtration mediated by protozoa activities to remove Escherichia coli (E. coli) in synthetic swine wastewater. The experiment used plastic columns packed with Leilehua soil from Oahu Island, Hawaii. The soil physicochemical adsorption was seen to reduce 95.52%–96.47% of E. coli. However, the average removal efficiencies were increased to 98.17% in a single stage, and 99.99% in two sequential columns, under predation conditions. The filtration media containing naturally established bacterivores with the prey, provided a bioactive means to remove E. coli from the influent. The proper design of Leilehua soil filters potentially removes E. coli from the influent to meet the standard level of recycled water.

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“…It has been reported that the main environmental impacts are focused in the feed supply chain, which is made up of corn, soybeans, wheat, barley, among other agricultural products. In addition to the pig meat production processes, animal waste, such as slurry, is also the cause of contamination when deposited in water and soil, as well as air emissions that generate bad odors and negative social and aesthetic effects [9,10]. At a global level, it has been reported that intensive pig rearing generates around 10% of GHG emissions from livestock, which corresponds to second place in this sector [11], while its energy consumption represented 31% of consumption in the agro-livestock sector [12,13].…”

Section: Introductionmentioning

confidence: 99%

Environmental Impacts Associated with Intensive Production in Pig Farms in Mexico through Life Cycle Assessment

et al. 2021

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In this research, environmental impacts associated with the intensive production of pigs on a farm in Mexico were determined through the application of life cycle assessment methodology. The research was focused on the following stages of the product system: (i) pig rearing and growth phases; (ii) production operations in the pig-house; (iii) the supply of feed. The life cycle inventory database was mainly made up of data collected in field visits to local farms. The functional unit was defined as one finished swine weighing 124 kg. The results for the selected impact categories of carbon, water, and energy footprints were 538.62 kg CO2eq, 21.34 m3, and 1773.79 MJ, respectively. The greatest impact was generated in the final stages of pig fattening, mainly due to the large quantity of feed supplied. The impacts caused by operation of the pig farm were less significant, their contribution in all cases was less than a third of the total quantified values. The energy conversion of pig slurry improves the environmental performance of the product system by reducing the carbon footprint.

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Sludge management in anaerobic swine lagoons: A review

Cited by 27 publications

References 74 publications

Efficacy of a vermifilter at mitigating greenhouse gases and ammonia emissions from dairy wastewater

Efficacy of a vermifilter at mitigating greenhouse gases and ammonia emissions from dairy wastewater

A Sustainable and Low-Cost Soil Filter Column for Removing Pathogens from Swine Wastewater: The Role of Endogenous Soil Protozoa

Environmental Impacts Associated with Intensive Production in Pig Farms in Mexico through Life Cycle Assessment

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