TY - JOUR
T1 - Application of nitrogen sufficiency conversion strategy for microalgae-based ammonium-rich wastewater treatment
AU - Wang, Jinghan
AU - Zhou, Wenguang
AU - Yang, Haizhen
AU - Ruan, Roger
N1 - Publisher Copyright:
© 2016 Informa UK Limited, trading as Taylor & Francis Group.
PY - 2016/10/17
Y1 - 2016/10/17
N2 - Ammonium (NH4+-N)-rich wastewater, a main cause for eutrophication, can serve as a promising medium for fast microalgae cultivation with efficient (NH4+-N) -N removal. To achieve this goal, a well-controlled three-stage treatment process was developed. Two trophic modes (mixotrophy and heterotrophy) in Stage 1 and Stage 2, with two nitrogen availability conditions (N sufficient and N deprived) in Stage 2, and different (NH4+-N)concentrations in Stage 3 were compared to investigate the effects of nitrogen sufficiency conversion on indigenous strain UMN266 for (NH4+)-N removal. Results showed that mixotrophic cultures in the first two stages with N deprivation in Stage 2 was the optimum treatment strategy, and higher (NH4+)-N concentration in Stage 3 facilitated both microalgal growth and (NH4+) -N removal, with average and maximum biomass productivity of 55.3 and 161.0 mg L−1 d−1, and corresponding removal rates of 4.2 and 15.0 mg L−1 d−1, respectively, superior to previously published results. Observations of intracellular compositions confirmed the optimum treatment strategy, discovering excellent starch accumulating property of strain UMN266 as well. Combination of bioethanol production with the proposed three-stage process using various real wastewater streams at corresponding stages was suggested for future application.
AB - Ammonium (NH4+-N)-rich wastewater, a main cause for eutrophication, can serve as a promising medium for fast microalgae cultivation with efficient (NH4+-N) -N removal. To achieve this goal, a well-controlled three-stage treatment process was developed. Two trophic modes (mixotrophy and heterotrophy) in Stage 1 and Stage 2, with two nitrogen availability conditions (N sufficient and N deprived) in Stage 2, and different (NH4+-N)concentrations in Stage 3 were compared to investigate the effects of nitrogen sufficiency conversion on indigenous strain UMN266 for (NH4+)-N removal. Results showed that mixotrophic cultures in the first two stages with N deprivation in Stage 2 was the optimum treatment strategy, and higher (NH4+)-N concentration in Stage 3 facilitated both microalgal growth and (NH4+) -N removal, with average and maximum biomass productivity of 55.3 and 161.0 mg L−1 d−1, and corresponding removal rates of 4.2 and 15.0 mg L−1 d−1, respectively, superior to previously published results. Observations of intracellular compositions confirmed the optimum treatment strategy, discovering excellent starch accumulating property of strain UMN266 as well. Combination of bioethanol production with the proposed three-stage process using various real wastewater streams at corresponding stages was suggested for future application.
KW - Nitrogen sufficiency conversion
KW - ammonium-rich wastewater
KW - microalgae
KW - mixotrophic cultivation
KW - three-stage process
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U2 - 10.1080/09593330.2016.1158744
DO - 10.1080/09593330.2016.1158744
M3 - Article
C2 - 26979571
AN - SCOPUS:84961392387
SN - 0959-3330
VL - 37
SP - 2638
EP - 2648
JO - Environmental Technology (United Kingdom)
JF - Environmental Technology (United Kingdom)
IS - 20
ER -