Quality and Treatability of Seafood Processing Wastewater Using Coagulation – Flocculation Method


Kavoos Dindarloo 1 , Hamzeali Jamali 2 , * , Vali Alipour 3 , Zohreh Kheradpisheh 3 , Babak Goodarzi 3


1 Assisstant Professor Department of Environmental Health Engineering, Social Determinants in Health Promotion Research Center, Hormozgan University of Medical Sciences, Bandar Abbas, Iran.

2 Assisstant Professor Department of Environmental Health Engineering, Qazvin University of Medical Sciences, Qazvin, Iran.

3 Instructor Department of Environmental Health Engineering, Hormozgan University of Medical Sciences, Bandar Abbas, Iran.


Hormozgan Medical Journal: 18 (2); e87810
Published Online: July 10, 2013
Article Type: Research Article
Received: February 06, 2013
Accepted: July 10, 2013




Introduction: Seafood processing wastewater, containing high concentrations of pollutants
discharged to receiving waters will reduce the quality of water resources. The present study
was conducted to assess the quality and treatability of wastewater of fish market in Bandar
Abbas using coagulation – flocculation process.
Methods: In this cross-sectional study, 12 composite sample of wastewater from the fish
market in Bandar Abbas were selected randomly. Variables to assess the quality of the effluent
were TSS, COD, BOD5, pH, TP, TKN and FOG. Using jar test apparatus, appropriate
coagulant was chosen. Then coagulant dose and pH were optimized. Data analyses based on
measures of central tendency dispersion were performed using SPSS Software.
Results: The results of this study revealed that BOD5, COD, TSS, FOG, TKN and TP were
1200 mg/L, 1760 mg/L, 330 mg/L, 280 mg/L, 104 mg/L and 45.8 mg/L, respectively. These
indices were 46, 28, 8, 18, 24 and 2 times respectively greater than the maximum allowable
concentration levels for industrial wastewater discharge to receiving waters. Also based on the
results, poly aluminum chloride at the optimum dose of 150-17mg/L, the efficiency on COD
removal was 75%-90%, the optimum dose of ferric chloride 200-250mg/L, efficiency was
70%-90%, ferrous sulfate with 250-300mg/L, efficiency was 80%-90%, alum with optimal dose
250-300mg/L, efficiency was 60%-70%. Optimum pH values for poly aluminum chloride, ferric
chloride, ferrous sulfate and alum were 6-7, 5-6, 5-7 and 5-6, respectively.
Conclusion: In order to prevent pollution of coastal waters of Persian Gulf with wastewater
originated from fish market of Bandar Abbas, it is essential to treat this wastewater. Based on
the findings of this study, coagulation – flocculation process can significantly reduce the COD
of wastewater. It seems that in choosing the appropriate type and dose of coagulants and
optimum pH, environmental considerations are important.


Coagulation – Flocculation - Bandar Abbas

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