Fish canning wastewater treatment in sequencing batch reactor with activated sludge

Dijana Grgas,Tea Štefanac,Tibela Landeka Dragičević,Merima Toromanović,Jasmina Ibrahimpašić,Marina Ugrina

doi:10.33765/thate.10.2.1

Dijana Grgas, Tea Štefanac + Show 4 more

Open Access

https://doi.org/10.33765/thate.10.2.1

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Abstract

The biological performance of flocculent sludge in sequencing batch reactor for the treatment of fish canning wastewater was evaluated in terms of organic matter and nutrient removal by gradual increase of salt concentration in the nitritation-denitritation process. Salinity negatively affected the biological system performance in a way that reduced organic and nutrient removal. The removal efficiency of organic matter and nitrogen showed good performance below 20 g NaCl/L, while phosphate accumulating organisms activity was deteriorated and declined during whole experiment. Nitrogen removal occurred as ammonium oxidation with nitrite accumulation. Nitrite reduction was not affected by salt concentration.

Highlights

Fish processing industries generate wastewater, the amount and composition of which depend on the type of fish processed, the additives and the water source used, and the type of the operation process applied
In experiments with synthetic wastewater the activated sludge showed high metabolic activity for organic matter and nitrogen removal at salt concentration below 25 g NaCl/L, while PO4-P removal significantly decreased at salinity 20 g NaCl/L
The salt concentration 20 g NaCL/L affected the activated sludge with 70 % and 64 % removal efficiency for chemical oxygen demand (COD) and NH4-N, respectively, and further decrease of COD and NH4-N removal efficiency was observed with the increase of salinity (Figure 1)

Summary

Introduction

Fish processing industries generate wastewater, the amount and composition of which depend on the type of fish processed, the additives and the water source used, and the type of the operation process applied. Simultaneous nitritation-denitritation at salinities up to 50 g NaCl/L in the treatment of fish canning wastewater by aerobic granular sludge resulted in total nitrogen below 10 mg/L in effluent [6]. The objective of this research was to study the treatment of fish canning wastewater with a gradual increase of salt concentration in order to evaluate the removal efficiency of organic matter and nitrogen in the sequencing batch reactor (SBR) with flocculent sludge.

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Results

Conclusion