Industrial wastewater treatment for fertilizer industry—A case study

Vinay M. Bhandari*, Laxmi Gayatri Sorokhaibam, Vivek V. Ranade

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)
4707 Downloads (Pure)

Abstract

Wastewaters from chemical fertilizer industry mainly contain organics, alcohols, ammonia, nitrates, phosphorous, heavy metals such as cadmium and suspended solids. The nature of effluent streams varies in terms of its constituents and complexity. The present work attempts to fill the void in the literature that mostly reports synthetic wastewater treatment studies, by evaluating effluent treatment solutions and comparison of different methods for real wastewaters from the fertilizer industry. An attempt has been made to devise suitable methodology mainly using a new device in the form of vortex diode for hydrodynamic cavitation and also using adsorption, for several real wastewater streams from different locations in one major fertilizer industry of Maharashtra, India. The strategy involved characterization of wastewaters, studies on the effective removal of chemical oxygen demand (COD) and devising solutions for effective reduction in ammoniacal nitrogen—a more serious issue in the fertilizer industry. The characterization of wastewaters from different streams revealed huge variation in COD from 50 to 140,000 ppm and ammoniacal nitrogen from 6 to 1,700 ppm. Some effluent streams contained alcohol up to 5%. Hydrodynamic cavitation using vortex diode and adsorption with modified carbons were used to treat these streams. Cavitation studies were carried out on a pilot plant and the effect of pressure drop, cavitating device and process intensification were studied. It was observed that the effluent treatment strategy requires careful identification and application of suitable treatment method on the basis of the nature of the effluent. Also, hydrodynamic cavitation, using vortex diode appears to be techno-economically attractive option in treating fertilizer wastewaters giving a very high reduction in COD and ammoniacal nitrogen (up to 85%), similar to adsorption. The results clearly identify potential of newer methodologies in the treatment of effluents in the fertilizer industry.

Original languageEnglish
Number of pages11
JournalDesalination and Water Treatment
Early online date19 May 2016
DOIs
Publication statusEarly online date - 19 May 2016
Externally publishedYes

Keywords

  • Adsorption
  • Ammoniacal nitrogen
  • Cavitation
  • Effluent
  • Industry

ASJC Scopus subject areas

  • Pollution
  • Water Science and Technology
  • Ocean Engineering

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