ANALYSIS OF ENERGY RECOVERY AND CARBON EMISSION DURING SLUDGE ANAEROBIC DIGESTION UNDER DIFFERENT TREATMENT ROUTES

XIA Xue; SHAO Qianqi; CAO Yue; HUANG Wenxuan; FENG Qian; CAO Jiashun; LUO Jingyang

doi:10.13205/j.hjgc.202307001

Volume 41 Issue 7

Jul. 2023

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2023 > 41(7): 1-7,13

CAO Lixia, LI Wenshuan, LIN Xin, LI Xiaojun, FU Wanlong. EFFECTS OF SELENIUM APPLICATION ON ARSENIC UPTAKE AND ACCUMULATION IN RICE[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(7): 271-276. doi: 10.13205/j.hjgc.202307036

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XIA Xue, SHAO Qianqi, CAO Yue, HUANG Wenxuan, FENG Qian, CAO Jiashun, LUO Jingyang. ANALYSIS OF ENERGY RECOVERY AND CARBON EMISSION DURING SLUDGE ANAEROBIC DIGESTION UNDER DIFFERENT TREATMENT ROUTES[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(7): 1-7,13. doi: 10.13205/j.hjgc.202307001

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ANALYSIS OF ENERGY RECOVERY AND CARBON EMISSION DURING SLUDGE ANAEROBIC DIGESTION UNDER DIFFERENT TREATMENT ROUTES

doi: 10.13205/j.hjgc.202307001

XIA Xue^1,2,
SHAO Qianqi^1,2,
CAO Yue³,
HUANG Wenxuan^1,2,
FENG Qian^1,2,
CAO Jiashun^1,2,
LUO Jingyang^{1,2,4
,
,}

1. Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes of the Ministry of Education, Hohai University, Nanjing 210098, China;
2. College of Environment, Hohai University, Nanjing 210098, China;
3. School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, China;
4. Anhui Provincial Key Laboratory of Environmental Pollution Control and Resource Reuse, Hefei 230601, China

Received Date: 2022-11-16

Abstract

Abstract

Anaerobic digestion (AD) is one of the promising approaches to treat sludge for resource recovery and carbon reduction, but the efficiency of resource recovery and carbon reduction varied greatly under different treatment strategies. This work comprehensively evaluated the energy recovery and carbon emissions of four different treatment routes (i.e. conventional anaerobic digestion (R₁), hydrothermal pretreatment at 90℃/170℃ (R₂), co-digestion (R₃) and hydrothermal pretreatment with co-digestion (R₄), based on the Intergovernmental Panel on Climate Change (IPCC) methodology. Results indicated that the methane production followed an order of R₁ < R₂^90℃ < R₂^170℃ < R₃ < R₄, while the net carbon emission followed an order of R₃ < R₂^90℃ < R₁ < R₄ < R₂^170℃. All routes have achieved the aims of carbon neutrality >100% and negative carbon emissions, due to the self-sufficient heat and electricity. R₂^170℃ generated 15.4% more methane than R₂^90℃, but simultaneously increased 110% heat consumption and 60.5% carbon emissions (with a proportion of 74.3% indirect carbon emission). R₄ produced 6.3% more methane than R₃, but also increased 110% heat consumption and 61.9% carbon emissions (with a proportion of 95.9% indirect carbon emission). However, in R₃, more than 40.9% methane was generated compared with that of R₂^170℃, and it also reduced 52.7% heat consumption and 413% carbon emissions. These results implied that the co-digestion showed advantages over hydrothermal pretreatment for sludge anaerobic treatment in view of both energy recovery and carbon emission reduction. A balance between more energy input and increased operational performance should be considered in selecting the optimal sludge treatment route.
- carbon reduction,
- anaerobic co-digestion,
- sludge,
- food wastes,
- hydrothermal pretreatment,
- energy recovery

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References

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