TY - JOUR
T1 - Bioavailable electron donors from ultrasound-treated biomass for stimulating denitrification
AU - Wang, Youke
AU - Zeng, Qiuyu
AU - Zou, Shasha
AU - Hu, Chao
AU - Chen, Fu
AU - Zhang, Yongming
AU - Rittmann, Bruce E.
N1 - Funding Information:
The authors acknowledge the financial support of the ability construction project of local Colleges and Universities in Shanghai ( 16070503000 ), Special Fund of State Key Joint Laboratory of Environmental Simulation and Pollution Control, China ( 16K10ESPCT ), Shanghai Gaofeng & Gaoyuan Project for University Academic Program Development .
Publisher Copyright:
© 2019 Elsevier Ltd
PY - 2019/11/15
Y1 - 2019/11/15
N2 - Finding low-cost electron donors to drive denitrification is an important target for many municipal wastewater treatment plants (MWTPs). Excess sludge (biomass) potentially is a low-cost electron donor generated internally to the MWTP, but it has to be made more bioavailable. Aerobic and anoxic biomasses were treated with ultrasound, and their supernatants were used as electron donors for stimulating denitrification. The supernatant from ultrasound-treated anoxic biomass achieved 54% faster nitrate-N removal than did supernatant from the treated aerobic biomass, and the supernatant of untreated biomass was ineffective as an electron donor. UV illumination of the supernatants further enhanced the rates, with increments of 19% and 14%, respectively for the aerobic and anoxic supernatants. Sodium acetate at a range of initial concentrations was compared as a readily bioavailable electron donor to gauge the acceleration impact of the supernatants as equivalent bioavailable chemical oxygen demand (COD). The total chemical oxygen demand (TCOD) of the supernatant harvested from anoxic biomass without UV illumination was 76% bioavailable, while its bioavailable TCOD was 78% after UV illumination. For the supernatant from the aerobic biomass, the bioavailable fractions were, respectively, 56% and 58% without and with UV illumination. The greatest impact for converting excess biomass into a source of bioavailable electron donor to drive denitrification came from ultrasound treatment of the biomass, which disrupted the biomass to form particulate chemical oxygen demand (PCOD) that was bioavailable. PCOD was at least 51% bioavailable, and it contributed no less than 82% of the bioavailable COD.
AB - Finding low-cost electron donors to drive denitrification is an important target for many municipal wastewater treatment plants (MWTPs). Excess sludge (biomass) potentially is a low-cost electron donor generated internally to the MWTP, but it has to be made more bioavailable. Aerobic and anoxic biomasses were treated with ultrasound, and their supernatants were used as electron donors for stimulating denitrification. The supernatant from ultrasound-treated anoxic biomass achieved 54% faster nitrate-N removal than did supernatant from the treated aerobic biomass, and the supernatant of untreated biomass was ineffective as an electron donor. UV illumination of the supernatants further enhanced the rates, with increments of 19% and 14%, respectively for the aerobic and anoxic supernatants. Sodium acetate at a range of initial concentrations was compared as a readily bioavailable electron donor to gauge the acceleration impact of the supernatants as equivalent bioavailable chemical oxygen demand (COD). The total chemical oxygen demand (TCOD) of the supernatant harvested from anoxic biomass without UV illumination was 76% bioavailable, while its bioavailable TCOD was 78% after UV illumination. For the supernatant from the aerobic biomass, the bioavailable fractions were, respectively, 56% and 58% without and with UV illumination. The greatest impact for converting excess biomass into a source of bioavailable electron donor to drive denitrification came from ultrasound treatment of the biomass, which disrupted the biomass to form particulate chemical oxygen demand (PCOD) that was bioavailable. PCOD was at least 51% bioavailable, and it contributed no less than 82% of the bioavailable COD.
KW - Bioavailable electron equivalents
KW - Excess sludge
KW - Nitrogen removal
KW - Ultrasound treatment
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U2 - 10.1016/j.jenvman.2019.109533
DO - 10.1016/j.jenvman.2019.109533
M3 - Article
C2 - 31551199
AN - SCOPUS:85072344363
SN - 0301-4797
VL - 250
JO - Journal of Environmental Management
JF - Journal of Environmental Management
M1 - 109533
ER -