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| Effects of acidification on gas emissions fromraw pig slurry and biogas liquid during storage |
| Received:November 09, 2015 |
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| KeyWord:acidification;pig slurry;biogas liquid;greenhouse gas;ammonia |
| Author Name | Affiliation | E-mail | | LI Lu-lu | Key Laboratory of Energy Conservation and Waste Management of Agricultural Structures, Ministry of agriculture, Institute of Environment & Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China | | | DONG Hong-min | Key Laboratory of Energy Conservation and Waste Management of Agricultural Structures, Ministry of agriculture, Institute of Environment & Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China | | | ZHU Zhi-ping | Key Laboratory of Energy Conservation and Waste Management of Agricultural Structures, Ministry of agriculture, Institute of Environment & Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China | zhuzhiping@caas.cn | | WANG Yue | Key Laboratory of Energy Conservation and Waste Management of Agricultural Structures, Ministry of agriculture, Institute of Environment & Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China | |
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| Abstract: |
| This study aimed to investigate the emissions of greenhouse gases(CH4, N2O and CO2) and ammonia from acidified raw pig slurry and biogas liquid during their storages. Dynamic flux chamber method was used to continuously monitor gaseous emissions during a 75-day storage period. One control and two treatment groups were tested. For raw pig slurry, its pH was 6.5 in control group(RCK) while 5.1(RT1) and 5.7(RT2) in the treatment groups. For biogas liquid, pH in control was 7.8(BCK), but 5.7(BT1) and 6.5(BT2) in two treatments. The average daily gas emission rates in RCK, RT1, and RT2 were 32.2, 2.37, and 3.10 g CH4·m-3·d-1, 336.45, 23.36, and 29.79 mg N2O·m-3·d-1, 1.01, 0.82, and 1.63 g NH3·m-3·d-1, 109.14, 99.66, and 110.55 g CO2·m-3·d-1, respectively. Those of BCK, BT1, and BT2 were 0.24, 0.86, and 0.63 g CH4·m-3·d-1, 2.54, 73.43, and 268.66 mg N2O·m-3·d-1, 8.02, 1.35, and 1.51 g NH3·m-3·d-1, 48.9, 44.3, and 44.0 g CO2·m-3·d-1, respectively. For biogas liquid, acidification significantly increased CH4 and N2O emissions, but reduced NH3 emissions by 81% to 83%, while increased NH4+ by 40%to 54%, compared with the control. Based on 100-year global warming potentials(GWPs) of CH4 and N2O, total GHG(GHGs=CH4+N2O) emissions were reduced by 91% to 92% by acidifying raw pig slurry, whereas acidification increased total GHG emissions by 5 to 11 times for biogas liquid. These results show that the acidification significantly reduces GHG emissions from raw slurry, but increases GHG emissions from biogas liquid to some extent, whereas acidification significantly alleviates NH3 emissions and conserves the N content in biogas liquid. |
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