Abstract:The objective of this experiment was to evaluate the impact of feeding biochar in a growing diet on cattle performance, methane (CH4) and carbon dioxide (CO2) emissions. Biochar was sourced from ponderosa pine wood waste (High Plains Biochar, Laramie, WY) and was 83% C with 426 m2/g surface area. Crossbred steers (n = 160; initial BW = 357 kg ± 44 kg) were utilized in a randomized block design (blocked by BW), steers assigned randomly to pen (n = 16), and pens assigned randomly to treatment. Two treatments wer… Show more
“…The A 2 /O process pilot sludge was obtained from the on-site A 2 /O aeration tank. After 15 days of aeration treatment in the sedimentation tank, the experiment lasted for 6 months [13][14][15].…”
Section: Experimental Schemementioning
confidence: 99%
“…The A 2 /O process pilot sludge was obtained from the on-site A 2 /O aeration tank. After 15 days of aeration treatment in the sedimentation tank, the experiment lasted for 6 months [13][14][15]. In the SBR process, the relatively advanced long cylindrical short-pass nitrification SBR (PN-SBR) reactor is selected to treat sewage.…”
Section: Experimental Schemementioning
confidence: 99%
“…Before studying the emission characteristics of N2O and NO gas under different temperature conditions, PN-SBR is required to simulate the treatment of sewage with 30 °C and the same water quality. It operates for 4 cycles every day, and each cycle lasts for 6 h[15][16][17]. In the experiment of exploring the effect of temperature change on PN-SBR greenhouse gas emissions, the temperature conditions set were 30, 25, 20, 15, and 10 °C.…”
With the rising awareness of environmental protection, more sewage treatment plants have been built. However, this is also one of the main sources of greenhouse gas emissions. This study carried out a series of sewage treatment experiments to analyze the factors affecting the greenhouse gas emissions of the two commonly used treatment processes in the current urban sewage treatment: the A/O and SBR methods. The experimental results showed that the total amount of greenhouse gases emitted by the A/O method was 415.63 gCO2-eq/m3, and the total amount of greenhouse gases emitted by the SBR method was 879.51 gCO2-eq/m3. The N2O emission factor in the A/O method experimental group was 0.76% of the nitrogen content in the influent. In the aerobic section, when the content of dissolved oxygen was in the range of 1.30~2.10 mg/L, and the content of dissolved oxygen was 1.90 mg/L, the minimum N2O emission factor was reduced to 0.29% of the nitrogen content of the influent. In the SBR experimental group, the ammonia oxidation rate of sewage decreased rapidly as the temperature decreased, thus affecting the discharge rate of N2O. At 25 °C, the biological enzyme activity of nitrifying bacteria was higher, thus promoting denitrification and generating more greenhouse gases. The research results provide reference for strengthening the management of sewage treatment plants and reducing greenhouse gas emissions from sewage treatment plants.
“…The A 2 /O process pilot sludge was obtained from the on-site A 2 /O aeration tank. After 15 days of aeration treatment in the sedimentation tank, the experiment lasted for 6 months [13][14][15].…”
Section: Experimental Schemementioning
confidence: 99%
“…The A 2 /O process pilot sludge was obtained from the on-site A 2 /O aeration tank. After 15 days of aeration treatment in the sedimentation tank, the experiment lasted for 6 months [13][14][15]. In the SBR process, the relatively advanced long cylindrical short-pass nitrification SBR (PN-SBR) reactor is selected to treat sewage.…”
Section: Experimental Schemementioning
confidence: 99%
“…Before studying the emission characteristics of N2O and NO gas under different temperature conditions, PN-SBR is required to simulate the treatment of sewage with 30 °C and the same water quality. It operates for 4 cycles every day, and each cycle lasts for 6 h[15][16][17]. In the experiment of exploring the effect of temperature change on PN-SBR greenhouse gas emissions, the temperature conditions set were 30, 25, 20, 15, and 10 °C.…”
With the rising awareness of environmental protection, more sewage treatment plants have been built. However, this is also one of the main sources of greenhouse gas emissions. This study carried out a series of sewage treatment experiments to analyze the factors affecting the greenhouse gas emissions of the two commonly used treatment processes in the current urban sewage treatment: the A/O and SBR methods. The experimental results showed that the total amount of greenhouse gases emitted by the A/O method was 415.63 gCO2-eq/m3, and the total amount of greenhouse gases emitted by the SBR method was 879.51 gCO2-eq/m3. The N2O emission factor in the A/O method experimental group was 0.76% of the nitrogen content in the influent. In the aerobic section, when the content of dissolved oxygen was in the range of 1.30~2.10 mg/L, and the content of dissolved oxygen was 1.90 mg/L, the minimum N2O emission factor was reduced to 0.29% of the nitrogen content of the influent. In the SBR experimental group, the ammonia oxidation rate of sewage decreased rapidly as the temperature decreased, thus affecting the discharge rate of N2O. At 25 °C, the biological enzyme activity of nitrifying bacteria was higher, thus promoting denitrification and generating more greenhouse gases. The research results provide reference for strengthening the management of sewage treatment plants and reducing greenhouse gas emissions from sewage treatment plants.
Beef production is the primary contributor to greenhouse gas emissions in animal husbandry. But the carbon emission distribution, potential for carbon reduction, and pathways in the main links of the beef cattle industry chain are not yet clear. Balancing efficiency and fairness while taking tailored emission reduction paths according to local conditions is crucial in helping to achieve the low-carbon animal husbandry and “dual carbon” goals. This research adopts an industry chain perspective to assess four leading beef production regions’ carbon emissions, potential, and pathways in China from 2007 to 2021. We use life cycle assessment, the potential index which considers efficiency and fairness; the results are as follows: (1) The potential for carbon emission reduction in China’s beef industry showed an inverted U-shaped change trend from 2007 to 2021, and the average potential for carbon emission reduction in most provinces fluctuated around 0.500. (2) The main producing areas of China’s beef industry were divided into four areas of high efficiency and low fairness (Area A); high efficiency and high fairness (Area B); low efficiency and low fairness (Area C); and low efficiency and high fairness (Area D). (3) Differentiated emission reduction pathways were designed to reduce emissions, highlighting the need to implement region-specific carbon reduction policies.
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