References
  -  H. Tee, P. Lim, C. Seng, M.A.M. Nawi, R. Adnan, Enhancement
    of azo dye Acid Orange 7 removal in newly developed horizontal
    subsurface-flow constructed wetland, J. Environ. Manage.,
    147 (2015) 349–355. 
-  A.B.D. Santos, M.P.D. Madrid, F.A.M.D. Bok, A.J.M. Stams,
    J.B.V. Lier, F.J. Cervantes, The contribution of fermentative
    bacteria and methanogenic archaea to azo dye reduction by a
    thermophilic anaerobic consortium, Enzyme Microb. Tech., 39
    (2006) 38–46. 
-  L. Wang, J. Li, Adsorption of C.I. Reactive Red 228 dye from
    aqueous solution by modified cellulose from flax shive: Kinetics,
    equilibrium, and thermodynamics, Ind Crop Prod., 42
    (2013) 153–158. 
-  K. Ravikumar, S. Krishnan, S. Ramalingam, K. Balu, Optimization
    of process variables by the application of response
    surface methodology for dye removal using a novel adsorbent,
    Dyes Pigments, 72 (2007) 66–74. 
-  J.R. Guimarães, M.G. Maniero, D.A.R. Nogueira, A comparative
    study on the degradation of RB-19 dye in an aqueous
    medium by advanced oxidation processes, J. Environ. Manage.,
    110 (2012) 33–39. 
-  K. Solanki, S. Subramanian, S. Basu, Microbial fuel cells for
    azo dye treatment with electricity generation: A review, Biores.
    Technol., 131 (2013) 564–571. 
-  J. Sun, Y. Hu, Z. Bi, Y. Cao, Simultaneous decolorization of azo
    dye and bioelectricity generation using a micro filtration membrane
    air-cathode single-chamber microbial fuel cell, Biores.
    Technol., 100 (2009) 3185–3192. 
-  Y. Mu, K. Rabaey, R.A. Rozendal, Z. Yuan, J. Keller, Decolorization
    of azo dyes in bioelectron chemical systems., Environ. Sci.
    Technol., 43 (2009) 5137–5143. 
-  Z. Li, X. Zhang, J. Lin, S. Han, L. Lei, Azo dye treatment with
    simultaneous electricity production in an anaerobic-aerobic
    sequential reactor and microbial fuel cell coupled system,
    Biores. Technol., 101 (2010) 4440–4445. 
-  H. Ding, Y. Li, A. Lu, S. Jin, C. Quan, C. Wang, Photo catalytically
    improved azo dye reduction in a microbial fuel cell with
    rutile-cathode, Biores. Technol., 101 (2010) 3500–3505. 
-  B. Hou, J. Sun, Y. Hu, Effect of enrichment procedures on performance
    and microbial diversity of microbial fuel cell for
    Congo red decolorization and electricity generation, Appl.
    Microbiol. Biot., 90 (2011) 1563–1572. 
-  W. Thung, S. Ong, L. Ho, Y. Wong, F. Ridwan, Y. Oon, Y. Oon,
    H.K. Lehl, A highly efficient single chambered up-flow membrane-
    less microbial fuel cell for treatment of azo dye Acid
    Orange 7-containing wastewater, Biores. Technol., 197 (2015)
    284–288. 
-  L.C. Davies, I.S. Pedro, J.M. Novais, S. Martins-Dias, Aerobic
    degradation of acid orange 7 in a vertical-flow constructed
    wetland, Water Res., 40 (2006) 2055–2063. 
-  S. Ong, K. Uchiyama, D. Inadama, Y. Ishida, K. Yamagiwa,
    Treatment of azo dye Acid Orange 7 containing wastewater
    using up-flow constructed wetland with and without supplementary
    aeration, Biores. Technol., 101 (2010) 9049–9057. 
-  A.K. Yadav, S. Jena, B.C. Acharya, B.K. Mishra, Removal of
    azo dye in innovative constructed wetlands: Influence of iron
    scrap and sulfate reducing bacterial enrichment, Ecol. Eng., 49
    (2012) 53–58. 
-  A. Hussein, M. Scholz, Dye wastewater treatment by vertical-flow constructed wetlands, Ecol. Eng., 101 (2017) 28–38. 
-  A.K. Yadav, P. Dash, A. Mohanty, R. Abbassi, B.K. Mishra, Performance
    assessment of innovative constructed wetland-microbial
    fuel cell for electricity production and dye removal,
    Ecol. Eng., 47 (2012) 126–131. 
-  C. Corbella, J. García, J. Puigagut, Microbial fuel cells for clogging
    assessment in constructed wetlands, Sci. Total Environ.,
    569 (2016) 1060–1063. 
-  C.T.M.J. Frijters, R.H. Vos, G. Scheffer, R. Mulder, Decolorizing
    and detoxifying textile wastewater, containing both soluble
    and insoluble dyes, in a full scale combined anaerobic/aerobic
    system, Water Res., 40 (2006) 1249–1257. 
-  S.A. Patil, V.P. Surakasi, S. Koul, S. Ijmulwar, A. Vivek, Y.S.
    Shouche, B.P. Kapadnis, Electricity generation using chocolate
    industry wastewater and its treatment in activated sludge
    based microbial fuel cell and analysis of developed microbial
    community in the anode chamber, Biores. Technol., 100 (2009)
    5132–5139. 
-  S.R. Higgins, D. Foerster, A. Cheung, C. Lau, O. Bretschger,
    S.D. Minteer, K. Nealson, P. Atanassov, M.J. Cooney, Fabrication
    of macro porous chitosan scaffolds doped with carbon
    nano tubes and their characterization in microbial fuel cell
    operation, Enzyme Microb. Tech., 48 (2011) 458–465. 
-  M.S. Khehra, H.S. Saini, D.K. Sharma, B.S. Chadha, S.S.
    Chimni, Biodegradation of azo dye C.I. Acid Red 88 by an
    anoxic–aerobic sequential bioreactor, Dyes Pigments, 70 (2006)
    1–7. 
-  D. Cui, Y.Q. Guo, H.Y. Cheng, B. Liang, F.Y. Kong, H.S. Lee, A.J.
    Wang, Azo dye removal in a membrane-free up-flow biocatalyzed
    electrolysis reactor coupled with an aerobic bio-contact
    oxidation reactor, J. Hazard. Mater., 239 (2012) 257–264. 
-  F. Kong, A. Wang, H.Y. Ren, Improved azo dye decolorization
    in an advanced integrated system of bioelectro chemical module
    with surrounding electrode deployment and anaerobic
    sludge reactor, Biores. Technol., 175 (2014) 624–628. 
-  S.Y. Kim, J.Y. An, B.W. Kim, The effects of reductant and carbon
    source on the microbial decolorization of azo dyes in an anaerobic
    sludge process, Dyes Pigments, 76 (2008) 256–263. 
-  Y.F. Lin, S.R. Jing, T.W. Wang, D.Y. Lee, Effects of macro phytes
    and external carbon sources on nitrate removal from groundwater
    in constructed wetlands, Environ. Pollut., 119 (2002)
    413–420. 
-  G. Fu, L. Huangshen, Z. Guo, Q. Zhou, Z. Wu, Effect of plantbased
    carbon sources on denitrifying microorganisms in a
    vertical flow constructed wetland, Biores. Technol., 224 (2016)
    214–221. 
-  Y. Ding, X. Song, Y. Wang, D. Yan, Effect of supplying a carbon
    extracting solution on denitrification in horizontal subsurface
    flow constructed wetlands, Korean J. Chem. Eng., 30 (2013)
    379–384. 
-  M. Zhang, L. Zhao, C. Mei, L. Yi, G. Hua, Effects of plant material
	  as carbon sources on TN removal efficiency and N2O flux
    in vertical-flow-constructed wetlands, Water Air Soil Poll., 225
  (2014) 2181–2190. 
-  D.L. Klass, Biomass for renewable energy, fuels, and chemicals,
    Academic Press, San Diego, 2000. 
-  Z. Fang, H. Song, N. Cang, X. Li, Performance of microbial fuel
    cell coupled constructed wetland system for decolorization
    of azo dye and bioelectricity generation, Biores. Technol., 144
    (2013) 165–171. 
-  J.F. Payne, A. Mathieu, W. Melvin, L.L. Fancey, Bacterial decolorization
    and degradation of azo dyes, Int. Biodeter. Biodegr.,
    59 (2007) 73–84. 
-  Z. Fang, H. Song, R. Yu, X. Li, A microbial fuel cell-coupled
    constructed wetland promotes degradation of azo dye decolorization
    products, Ecol. Eng., 94 (2016) 455–463. 
-  V.D.Z. Fp, G. Lettinga, J.A. Field, Azo dye decolourisation by
    anaerobic granular sludge, Chemosphere, 44 (2001) 1169–1176. 
-  A. Stolz, Basic and applied aspects in the microbial degradation
    of azo dyes, Appl. Microbiol. Biot., 56 (2001) 69–80. 
-  Z. Fang, H. Song, N. Cang, X. Li, Electricity production from
    Azo dye wastewater using a microbial fuel cell coupled constructed
    wetland operating under different operating conditions,
    Biosens Bioelectron., 68 (2015) 135–141. 
-  B.Y. Chen, K.W. Lin, Y.M. Wang, C.Y. Yen, Revealing interactive
    toxicity of aromatic amines to azo dye decolorizer Aeromonas
    hydrophila, J. Hazard. Mater., 166 (2009) 187–194. 
-  P.L. Skipper, M.Y. Kim, H.L.P. Sun, G.N. Wogan, S.R. Tannenbaum,
    Monocyclic aromatic amines as potential human carcinogens:
    old is new again, Carcino Genesis., 31 (2010) 50–58. 
-  S. Jian, Y.Y. Hu, B. Zhe, Y.Q. Cao, Simultaneous decolorization
    of azo dye and bioelectricity generation using a micro filtration
    membrane air-cathode single-chamber microbial fuel cell,
    Biores. Technol., 100 (2009) 3185–3192. 
-  J. Sun, Y.Y. Hu, B. Hou, Electrochemical characteriztion of the
    bioanode during simultaneous azo dye decolorization and
    bioelectricity generation in an air-cathode single chambered
    microbial fuel cell, Electrochim. Acta., 56 (2011) 6874–6879. 
-  B.Y. Chen, M.M. Zhang, C.T. Chang, Y. Ding, K.L. Lin, C.S.
    Chiou, C.C. Hsueh, H. Xu, Assessment upon azo dye decolorization
    and bioelectricity generation by Proteus hauseri.,
    Biores. Technol., 101 (2010) 4737–4741.