M. Saleem


The hazardous and toxic nature of some of the constituent such as nitrite in the aquaculture wastewater is of major concern. Present study focuses the removal of nitrite from the aquaculture wastewater prior to disposal. Effect of certain operational parameters such as electrode material, current density, initial pH, and electrode spacing on nitrite removal from aquaculture wastewater was elucidated. Better nitrite removal efficiency achieved when nickel used as compared to stainless steel, graphite and aluminum electrodes. Nitrite removal is positively related to the current density however, increase is up to 31.4% when current density increased from 2.5 to 9.3 mA/cm2 . Further increase in current density does not improve the process efficiency. Removal efficiency of electrochemical process decreased with the increase in initial pH of test solution. However, with the passage of time this difference is diminishing. This may be attributed to the presence of higher amount of hypochloric acid which does not dissociate at lower pH values. Subsequently faster oxidation of nitrite achieved during first few minutes of test runs. Amount of available hypochloric acid reduced at high pH values and oxidation of nitrite reduced subsequently. Rate of nitrite removal found to be increased as the inter-electrode spacing decreased up to an optimal spacing of 3 cm which showed highest nitrite removal. Further reduction in spacing does not augment the removal efficiency probably due to the formation of scale on cathode surface and passivation of electrode which suppressed further oxidation process.

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UNDP, United Nations Development

Program, Human Development Report,

Oxford Press, New York (2003).

N. S. Abuzaid, Z. Al-Hamouz, A. A. Bukhari,

and M. H. Essa, Water, Air and Soil Pollution

(1999) 429.

J. Foley, D. Haas, Z. Yuan and P. Lant,

Water Research 44 (2010) 831.

P. B. Liao and R. D. Mayo, Aquacul. 3 (1974)

G. Otte and H. Rosenenthal, Aquacul Res. 28


S. Mahesh, B. Prasad, I.D. Mall and I. M.

Mishra, Ind. Eng. Chem. Res. 45 (2006)

Y. Lei, Z. Shen, X. Chen, J. Jia and W.

Wang, Wat. SA. 32 (2006) 205.

D. Kaplan, R. Wilhelm and A. Abeliovich,

Wat. Sci. and Tech. 42 (2000) 167.

S. Lin and C. Wu, Wat. Res. 30 (1996) 715.

G. Chen, Electrochemical Technologies in

Wastewater Treatment. Invited Seminar at

East China University of Science and

Technology. October (2003).

F. C. Walsh, Pure and Appl. Chem. 73

(2001) 1819.

M. A. Jorquera, G. Valencia, M. Eguchi, M.

Katayose and C. Riquelme, Aquacul. 207

(2002) 213.

M. M. Emamjomeh and M. Sivakumar,

J. Env. Manag. 90 (2009) 1663.

M. G. Poxton and S. B. Allhouse, Aquacul.

Engg. 1 (1982) 153.

Standard methods for the examination of

water and wastewater. 21st edition, APHA,

AWWA and WPCF, Washington, D.C (2000).

C. Belmont, R. Ferrigno, O. Leclerc and H. H.

Girault, Electrochimica Acta 44 (1998) 597.

S.T. Summerfelt, J.A. Hankins, A.L. Weber

and M.D. Duran, Aquacul. 158 (1997) 57.

V. Ashworth and C. J. L. Booker, C. J. L.,

Cathodic protection theory and practices.

Institute of Corrosion/Ellis Horward Ltd.,

London, England (1986) p. 152.

M. Saleem, A. Hussain, and N. Irfan, 2nd

National Conference on Energy and

Environment: Issues, Concerns and Options.

Quaid-e-Awam University of Engineering

Science and Technology, March 27-29

(2008) Nawabshah, Pakistan.

M. Saleem, M. H. Essa and M. H.

Chakrabarti. 1st International Conference on

Energy and Environment: Role of Energy

Resources in Sustainability of Environment.

Quaid-e-Awam University of Engineering

Science and Technology, February 26-29

(2009) Nawabshah, Pakistan.

C. C. Sun and T. C. Chou, J. of Mol. Cataly.

A: Chemical 151 (1994) 133.

S. Ghafari, M. Hasan and M. K. Aroua,

Electrochimica Acta 54 (2009) 4164.

J. Virkutyte, E. Rokhina and V. Jegatheesan,

Bioresource Technology 101 (2010) 1440.

R. Ferrigno, C. Comninellis, V. Reid, C.

Modes, R. Scannell and H. H. Girault,

Electrochimica Acta 44 (1999) 2871.

D. Reyter, D. Bélanger and L. Roué, J. of

Physical Chemistry C 113 (2009) 290.

D. Reyter, D. Bélanger and L. Roué, Wat.

Res. 44 (2010) 1918.


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