1. Z.C. Guo, Z.X. Fu, Current situation of energy consumption and measures taken for energy saving in the iron and steel industry in China, Energy, 35 (2010) 4356–4360.
  2. J. Ernesto Ramírez, S. Esquivel-González, J. René Rangel- Mendez, S.L. Arriaga, M. Gallegos-García, G. Buitrón, F.J. Cervantes, Biorecovery of metals from a stainless steel industrial effluent through denitrification performed in a novel anaerobic swirling fluidized membrane bioreactor (ASFMBR), Ind. Eng. Chem. Res., 59 (2020) 2725–2735.
  3. P. Das, G.C. Mondal, S. Singh, A.K. Singh, B. Prasad, K.K. Singh, Effluent treatment technologies in the iron and steel industry - a state of the art review, Water Environ. Res., 90 (2018) 395–408.
  4. Y. Fernández-Nava, E. Marañón, J. Soons, L. Castrillón, Denitrification of wastewater containing high nitrate and calcium concentrations, Bioresour. Technol., 99 (2008) 7976–7981.
  5. U. Sandhya, D. Banerjee, I.J. Singh, P.K. Wattal, Denitrification of high sodium nitrate bearing effluents using flow-through bioreactor, Desal. Water Treat., 38 (2012) 52–58.
  6. W.L. Huang, B.G. Zhang, C.P. Feng, M. Li, J. Zhang, Research trends on nitrate removal: a bibliometric analysis, Desal. Water Treat., 50 (2012) 67–77.
  7. J.Y. Jung, S.J. Bae, W.J. Lee, Nitrate reduction by maghemite supported Cu-Pd bimetallic catalyst, Appl. Catal., B, 127 (2012) 148–158.
  8. G.P. Sun, J.F. Wan, Y.C. Sun, H.S. Li, C. Chang, Y. Wang, Enhanced removal of nitrate and refractory organic pollutants from biotreated coking wastewater using corncobs as carbon sources and biofilm carriers, Chemosphere, 237 (2019)124520–124528.
  9. M.M.M. Kuypers, H.K. Marchant, B. Kartal, The microbial nitrogen-cycling network, Nat. Rev. Microbiol., 16 (2018) 263–276.
  10. E. Raper, R. Fisher, D.R. Anderson, T. Stephenson, A. Soares, Nitrogen removal from coke making wastewater through a pre-denitrification activated sludge process, Sci. Total Environ., 666 (2019) 31–38.
  11. E. Marañón, I. Vázquez, J. Rodríguez, L. Castrillón, Y. Fernández, Coke wastewater treatment by a three-step activated sludge system, Water Air Soil Pollut., 192 (2008) 155–164.
  12. E.C. Li, S.G. Lu, Denitrification processes and microbial communities in a sequencing batch reactor treating nanofiltration (NF) concentrate from coking wastewater, Water Sci. Technol., 76 (2017) 3289–3298.
  13. P.L. McCarty, What is the best biological process for nitrogen removal: when and why?, Environ. Sci. Technol., 52 (2018) 3835–3841.
  14. J.L. Tang, X.C. Wang, Y.S. Hu, Y.H. Pu, J. Huang, H.H. Ngo, Y.G. Zeng, Y.Y. Li, Nutrients removal performance and sludge properties using anaerobic fermentation slurry from food waste as an external carbon source for wastewater treatment, Bioresour. Technol., 271 (2019) 125–135.
  15. S. Naahidi, M. Jafari, M. Logan, Y. Wang, Y.F. Yuan, H.J. Bae, B. Dixon, P. Chen, Biocompatibility of hydrogel-based scaffolds for tissue engineering applications, Biotechnol. Adv., 35 (2017) 530–544.
  16. A. Freeman, M.D. Lilly, Effect of processing parameters on the feasibility and operational stability of immobilized viable microbial cells, Enzyme Microb. Technol., 23 (1998) 335–345.
  17. H.H. Dong, W. Wang, Z.Z. Song, H. Dong, J.F. Wang, S.S. Sun, Z.Z. Zhang, M. Ke, Z.J. Zhang, W.-M. Wu, G.Q. Zhang, J. Ma, A high-efficiency denitrification bioreactor for the treatment of acrylonitrile wastewater using waterborne polyurethane immobilized activated sludge, Bioresour. Technol., 239 (2017) 472–481.
  18. H.A. Ahmad, S.-Q. Ni, S. Ahmad, J. Zhang, M. Ali, H.H. Ngo, W.S. Guo, Z.W. Tan, Q. Wang, Gel immobilization: a strategy to improve the performance of anaerobic ammonium oxidation (anammox) bacteria for nitrogen-rich wastewater treatment, Bioresour. Technol., 313 (2020) 123642–123654.
  19. T.-H. Hsia, Y.-J. Feng, C.-M. Ho, W.-P. Chou, S.-K. Tseng, PVAalginate immobilized cells for anaerobic ammonium oxidation (anammox) process, J. Ind. Microbiol. Biotechnol., 35 (2008) 721–727.
  20. R.R. Nair, P.B. Dhamole, S.S. Lele, S.F. D’Souza, Biotreatment of high strength nitrate waste using immobilized preadapted sludge, Appl. Biochem. Biotechnol., 151 (2008) 193–200.
  21. R. Aoyagi, R. Sato, A. Terada, H. Tokuyama, Novel composite gel beads for the immobilization of ammonia-oxidizing bacteria: fabrication, characterization, and biokinetic analysis, Chem. Eng. J., 342 (2018) 260–265.
  22. J.L. Xue, Y.N. Wu, K. Shi, X.F. Xiao, Y. Gao, L. Li, Y.L. Qiao, Study on the degradation performance and kinetics of immobilized cells in straw-alginate beads in marine environment, Bioresour. Technol., 280 (2019) 88–94.
  23. N. Li, H.C. Xu, Y.P. Yang, X.M. Xu, J.L. Xue, Preparation, optimization and reusability of immobilized petroleumdegrading bacteria, Environ. Technol., (2019) 1703826–1703826.
  24. Y.M. Dong, Z.J. Zhang, Y.W. Jin, J. Lu, X.H. Cheng, J. Li, Y.-Y. Deng, Y.-N. Feng, D.N. Chen, Nitrification characteristics of nitrobacteria immobilized in waterborne polyurethane in wastewater of corn-based ethanol fuel production, J. Environ. Sci., 24 (2012) 999–1005.
  25. F. Ma, Y.L. Sun, A. Li, X.N. Zhang, J.X. Yang, Activation of accumulated nitrite reduction by immobilized Pseudomonas stutzeri T13 during aerobic denitrification, Bioresour. Technol., 187 (2015) 30–36.
  26. X.Y. Xu, C.P. Lv, X.L. You, B. Wang, F.Y. Ji, B.B. Hu, Nitrogen removal and microbial diversity of activated sludge entrapped in modified poly(vinyl alcohol)–sodium alginate gel, Int. Biodeterior. Biodegrad., 125 (2017) 243–250.
  27. L.G. Hou, J. Li, Y. Liu, Microbial communities variation analysis of denitrifying bacteria immobilized particles, Process Biochem., 87 (2019) 151–156.
  28. L.G. Hou, J. Li, Z.M. Zheng, Q. Sun, Y.T. Liu, K. Zhang, Cultivating river sediments into efficient denitrifying sludge for treating municipal wastewater, R. Soc. Open Sci., 6 (2019) 190304–190304.
  29. E.W. Rice, R.B. Baird, A.D. Eaton, L.S. Clesceri, Standard Methods for the Examination of Water and Wastewater, American Public Health Association, American Water Works Association, Water Environment Federation, Washington, D.C., 2012.
  30. K. Bernat, I. Wojnowska-Baryła, A. Dobrzyńska, Denitrification with endogenous carbon source at low C/N and its effect on P(3HB) accumulation, Bioresour. Technol., 99 (2008) 2410–2418.
  31. L. Pelaz, A. Gómez, A. Letona, G. Garralón, M. Fdz-Polanco, Nitrogen removal in domestic wastewater. Effect of nitrate recycling and COD/N ratio, Chemosphere, 212 (2018) 8–14.
  32. H.D. Hu, K.W. Liao, J.J. Geng, K. Xu, H. Huang, J.F. Wang, H.Q. Ren, Removal characteristics of dissolved organic nitrogen and its bioavailable portion in a postdenitrifying biofilter: effect of the C/N ratio, Environ. Sci. Technol., 52 (2018) 757–764.
  33. X.Y. Fan, H.-q. Li, P. Yang, B. Lai, Effect of C/N ratio and aeration rate on performance of internal cycle MBR with synthetic wastewater, Desal. Water Treat., 54 (2015) 573–580.
  34. J. Torno, C. Naas, J.P. Schroeder, C. Schulz, Impact of hydraulic retention time, backflushing intervals, and C/N ratio on the SID-reactor denitrification performance in marine RAS, Aquaculture, 496 (2018) 112–122.
  35. Y.D. Guo, L. Guo, M. Sun, Y.G. Zhao, M.C. Gao, Z.L. She, Effects of hydraulic retention time (HRT) on denitrification using waste activated sludge thermal hydrolysis liquid and acidogenic liquid as carbon sources, Bioresour. Technol., 224 (2017) 147–156.
  36. G. Guo, Y.Y. Wang, T.W. Hao, D. Wu, G.-H. Chen, Enzymatic nitrous oxide emissions from wastewater treatment, Front. Environ. Sci. Eng., 12 (2018) 10–22.
  37. O. Auguet, M. Pijuan, H. Guasch-Balcells, C.M. Borrego, O. Gutierrez, Implications of downstream nitrate dosage in anaerobic sewers to control sulfide and methane emissions, Water Res., 68 (2015) 522–532.
  38. T. Zhang, M.-F. Shao, L. Ye, 454 Pyrosequencing reveals bacterial diversity of activated sludge from 14 sewage treatment plants, ISME J., 6 (2012) 1137–1147.
  39. J.L. Wang, L.B. Chu, Biological nitrate removal from water and wastewater by solid-phase denitrification process, Biotechnol. Adv., 34 (2016) 1103–1112.
  40. Q. Ma, Y.Y. Qu, W.L. Shen, Z.J. Zhang, J.W. Wang, Z.Y. Liu, D.X. Li, H.J. Li, J.T. Zhou, Bacterial community compositions of coking wastewater treatment plants in steel industry revealed by Illumina high-throughput sequencing, Bioresour. Technol., 179 (2015) 436–443.
  41. D. Chen, K. Yang, H.Y. Wang, High nitrate removal by autohydrogenotrophic bacteria in a biofilm-electrode reactor, Desal. Water Treat., 55 (2015) 1316–1324.
  42. M.Z. Siddiqi, W. Sok, G.M. Choi, S.Y. Kim, J.-H. Wee, W.T. Im, Simplicispira hankyongi sp. nov., a novel denitrifying bacterium isolated from sludge, Antonie Van Leeuwenhoek, 113 (2020) 331–338.
  43. A. Olaya-Abril, J. Hidalgo-Carrillo, V.M. Luque-Almagro, C. Fuentes-Almagro, F.J. Urbano, C. Moreno-Vivián, D.J. Richardson, M.D. Roldán, Exploring the denitrification proteome of Paracoccus denitrificans PD1222, Front. Microbiol., 9 (2018) 1–12.