Aerobic Digestion

Shammas, Nazih K.; Wang, Lawrence K.

doi:10.1007/978-1-60327-156-1_15

Cited by 5 publications

(3 citation statements)

References 28 publications

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“…It has to take place in a well-managed process to obtain a valuable product with minimum negative environmental impacts. The composting process reduces AW volume, moisture content, viable weed seeds, insect larvae (flies problems), and odor; it also reduces/eliminates pathogens due to the high process temperature (thermophilic) and it produces a humus-like compost (40-50% of the starting substrate) with fine, moderate, or coarse texture and rich in nutrients to be used as a biofertilizer [48,50], which subsequently can be used in organic agriculture to produce a top-quality food by enhancing the environment and maintaining soil fertility [51], which leads to increasing crops yield [49]. The duration of the composting process reaches 90 days, but it can also last for 75 days [52].…”

Section: Aerobic Digestion (Composting)mentioning

confidence: 99%

Bioconversion of Egypt's Agricultural Wastes into Biogas and Compost

Elfeki¹,

El-Bestawy²,

Tkadlec³

2017

Pol. J. Environ. Stud.

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Section: Aerobic Digestion (Composting)mentioning

confidence: 99%

Bioconversion of Egypt's Agricultural Wastes into Biogas and Compost

Elfeki¹,

El-Bestawy²,

Tkadlec³

2017

Pol. J. Environ. Stud.

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“…Biological treatment by aerobic digestion is the biochemical oxidative stabilization of wastewater sludge. It can reduce GHG emissions, odors, and pathogens; however, it entails higher capital costs for aeration and monitoring, and it does not produce useful byproducts such as methane [23]. Thermal conversion techniques, such as gasification and pyrolysis, have been widely used to convert organic waste into energy.…”

Section: Livestock Waste Managementmentioning

confidence: 99%

Evaluation of Biogas Potential from Livestock Manures and Multicriteria Site Selection for Centralized Anaerobic Digester Systems: The Case of Jalisco, México

et al. 2020

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The state of Jalisco is the largest livestock producer in Mexico, leading in the production of swine, eggs, and milk. This immense production generates enormous amounts of waste as a byproduct of the process itself. The poor management of livestock-derived waste can lead to multiple environmental problems like nutrient accumulation in soil, water eutrophication, and air pollution. The aim of this work is to establish a replicable geographic information system (GIS)-based methodology for selecting priority sites in which to implement anaerobic digestion units. These units will use multiple parameters that evaluate environmental risks and viability factors for the units themselves. A weighted overlay analysis was used to identify critical regions and, based on the results, clusters of individual livestock production units (LPUs) across the state were selected. Nitrogen and phosphorus recovery, as well as the energetic potential of the selected clusters, were calculated. Four clusters located mainly in the Los Altos region of Jalisco were selected as critical and analyzed. The results indicate that Jalisco has the potential to generate 5.5% of its total electricity demand if the entirety of its livestock waste is treated and utilized in centralized anaerobic digestion units. Additionally, 49.2 and 31.2 Gg of nitrogen and phosphorus respectively could be valorized, and there would be an estimated total reduction of 3012.6 Gg of carbon dioxide equivalent (CO2eq).

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“…However, the major drawback of aerobic digestion is that it requires a huge input of power to supply oxygen, even for small plants [22].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Digestibility of Attached and Suspended Growth Sludge in an Aerobic Digester for a Small Community

Azizi

Kamika

Tekere

2018

Water

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Abstract:The aerobic sludge digestion process for waste sludge generated from suspended biomass (i.e., activated sludge process, ASP) and attached biomass (i.e., moving bed bioreactor, MBBR and modified packed bed biofilm, PBBR) reactors in a residential complex were analyzed. The rate of digestion with respect to different sludge characteristics generated through these various treatment processes were examined; the results revealed that waste sludge from ASP took 16 days to achieve complete digestion while MBBR and PBBR took nine and seven days, respectively. The most important factors influencing the sludge digestion such as sludge volume index (SVI), mixed liquor suspended solid (MLSS), and mixed liquor volatile suspended solid (MLVSS) were examined. The ASP which had the highest initial MLSS and MLVS took a longer time for digestion. Aerobic sludge digestion in all the treatment reactors was studied under laboratory scale conditions in batch experimentation to evaluate sludge characteristics and the rate of digestion as well as through a continuous bench scale pilot system to optimize the process parameters. Removal efficiencies of volatile solids (VS) 90.71% in ASP, 84.27% in MBBR and 84.07% in PBBR in aerobic digestion during batch mode were also observed. The study revealed that the aerobic sludge digestion process utilized in curbing sludge is not feasible application for a small community due to very long digestion times and a large amount of space although Packed Bed Biofilm (PBBR) used the lowest time (seven days) compared to the other systems.

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Aerobic Digestion

Cited by 5 publications

References 28 publications

Bioconversion of Egypt's Agricultural Wastes into Biogas and Compost

Bioconversion of Egypt's Agricultural Wastes into Biogas and Compost

Evaluation of Biogas Potential from Livestock Manures and Multicriteria Site Selection for Centralized Anaerobic Digester Systems: The Case of Jalisco, México

Evaluation of the Digestibility of Attached and Suspended Growth Sludge in an Aerobic Digester for a Small Community

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