TY - JOUR
T1 - Comparison of heterotrophic and autotrophic denitrification processes for nitrate removal from phosphorus-limited surface water
AU - Wang, Zheng
AU - He, Shengbing
AU - Huang, Jungchen
AU - Zhou, Weili
AU - Chen, Wanning
N1 - Funding Information:
The study was supported by The National Natural Science Foundation of China ( 51678356 ); The Program for Chinese National Key Projects of Water Pollution Control and Reclamation ( 2017ZX07205003 ).
Publisher Copyright:
© 2018 Elsevier Ltd
PY - 2018/7
Y1 - 2018/7
N2 - Phosphorus (P) limitation has been demonstrated for micro-polluted surface water denitrification treatment in previous study. In this paper, a lab-scale comparative study of autotrophic denitrification (ADN) and heterotrophic denitrification (HDN) in phosphorus-limited surface water was investigated, aiming to find out the optimal nitrogen/phosphorus (N/P) ratio and the mechanism of the effect of P limitation on ADN and HDN. Furthermore, the optimal denitrification process was applied to the West Lake denitrification project, aiming to improve the water quality of the West Lake from worse than grade V to grade IV (GB3838-2006). The lab-scale study showed that the lack of P indeed inhibited HDN more greatly than ADN. The optimal N/P ratio for ADN and HDN was 25 and a 0.15 mg PO4 3--P L−1 of microbial available phosphorus (MAP) was observed. P additions could greatly enhance the resistance of ADN and HDN to hydraulic loading shock. Besides, The P addition could effectively stimulate the HDN performance via enriching the heterotrophic denitrifiers and the denitrifying phosphate-accumulating organisms (DNPAOs). Additionally, HDN was more effective and cost-effective than ADN for treating P-limited surface water. The study of the full-scale HDBF (heterotrophic denitrification biofilter) indicated that the denitrification performance was periodically impacted by P limitation, particularly at low water temperatures. The lack of phosphorus inhibited HDN more greatly than ADN.
AB - Phosphorus (P) limitation has been demonstrated for micro-polluted surface water denitrification treatment in previous study. In this paper, a lab-scale comparative study of autotrophic denitrification (ADN) and heterotrophic denitrification (HDN) in phosphorus-limited surface water was investigated, aiming to find out the optimal nitrogen/phosphorus (N/P) ratio and the mechanism of the effect of P limitation on ADN and HDN. Furthermore, the optimal denitrification process was applied to the West Lake denitrification project, aiming to improve the water quality of the West Lake from worse than grade V to grade IV (GB3838-2006). The lab-scale study showed that the lack of P indeed inhibited HDN more greatly than ADN. The optimal N/P ratio for ADN and HDN was 25 and a 0.15 mg PO4 3--P L−1 of microbial available phosphorus (MAP) was observed. P additions could greatly enhance the resistance of ADN and HDN to hydraulic loading shock. Besides, The P addition could effectively stimulate the HDN performance via enriching the heterotrophic denitrifiers and the denitrifying phosphate-accumulating organisms (DNPAOs). Additionally, HDN was more effective and cost-effective than ADN for treating P-limited surface water. The study of the full-scale HDBF (heterotrophic denitrification biofilter) indicated that the denitrification performance was periodically impacted by P limitation, particularly at low water temperatures. The lack of phosphorus inhibited HDN more greatly than ADN.
UR - http://www.scopus.com/inward/record.url?scp=85044594314&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85044594314&partnerID=8YFLogxK
U2 - 10.1016/j.envpol.2018.03.080
DO - 10.1016/j.envpol.2018.03.080
M3 - Article
C2 - 29605616
AN - SCOPUS:85044594314
SN - 0269-7491
VL - 238
SP - 562
EP - 572
JO - Environmental Pollution
JF - Environmental Pollution
ER -