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Simultaneous improvement of denitrification and settleability of activated sludge process by pyrolytic biochar
Xiaofeng Sima
Author NameAffiliationE-mail
Xiaofeng Sima University of Science & Technology of China smxf2013@mail.ustc.edu.cn 
Abstract:
Biochar is a massively produced by-product of biomass pyrolysis to obtain renewable energy and has not been fully used to date. At same time, insufficient denitrification of sewage and incomplete separation of activated sludge from the treated wastewater are two of the main factors that influence the efficiency of activated sludge process. In this study, we demonstrated a new approach to simultaneously improve the denitrification and settleability of activated sludge by adding biochar. Results show that dosing of biochar obtained at 573 K (char-573) exhibits 3-fold higher nitrate removal efficiency of that without biochar during 15 d run. Raman spectra indicate that the aromatization of organic carbon compounds in the biochar occurs at 773 K and increases with increasing pyrolysis temperature (973 K), which may be responsible for the decrease of denitrification effect by char-773 and char-973. Microbial community analyses clearly illustrate that char-573 provides a certain amount of carbon resource for bacterium growth and denitrification. Moreover, biochar can improve the settleability of activated sludge by changing the physicochemical characteristics of sludge (e.g., flocculating ability, ζ-potential, hydrophobicity, and EPS constituents). The new application of biochar demonstrated here facilitates the production of biomass renewable energy and abatement of carbon emission.
Key words:  Biochar  Biological denitrification  Carbon source  Activated sludge  Settleability.
FundProject:
Simultaneous improvement of denitrification and settleability of activated sludge process by pyrolytic biochar
司马小峰
摘要:
Biochar is a massively produced by-product of biomass pyrolysis to obtain renewable energy and has not been fully used to date. At same time, insufficient denitrification of sewage and incomplete separation of activated sludge from the treated wastewater are two of the main factors that influence the efficiency of activated sludge process. In this study, we demonstrated a new approach to simultaneously improve the denitrification and settleability of activated sludge by adding biochar. Results show that dosing of biochar obtained at 573 K (char-573) exhibits 3-fold higher nitrate removal efficiency of that without biochar during 15 d run. Raman spectra indicate that the aromatization of organic carbon compounds in the biochar occurs at 773 K and increases with increasing pyrolysis temperature (973 K), which may be responsible for the decrease of denitrification effect by char-773 and char-973. Microbial community analyses clearly illustrate that char-573 provides a certain amount of carbon resource for bacterium growth and denitrification. Moreover, biochar can improve the settleability of activated sludge by changing the physicochemical characteristics of sludge (e.g., flocculating ability, ζ-potential, hydrophobicity, and EPS constituents). The new application of biochar demonstrated here facilitates the production of biomass renewable energy and abatement of carbon emission.
关键词:  Biochar  Biological denitrification  Carbon source  Activated sludge  Settleability.
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