Fishing Industry Waste Water Treatment by Polyelectrolytes

The fishing industries consume huge amount of water and also produce tonnes of waste water from fish preservation and fish tanks. The fishing industry wastewater treatment can be done by sequence of treatment processes such as sedimentation, coagulation. Characteristics of fishing industry wastewater are the color is light brown, pH is 8, COD is 576.0mg/l, BOD3 is 185.0mg/l, VSS is 0.56mg/L, TSS is 110.5mg/l, conductivity is 39300.0µs/cm, oil and grease is 2.1mg/l, fecal coliform is >2400MPN, total phosphorous is 22.6mg/l, total nitrogen is 60.0mg/l, ammonical nitrogen is <0.05, TOC is 20.8mg/l and turbidity is 3.9NTU. The optimum dosage of aluminium chloride as a polyelectrolyte is found to be 100mg/l, optimum pH is 7 and optimum time 30min. The reduction in turbidity for the fishing industry wastewater is 79%, reduction in BOD3 is 65%, reduction in COD is 66%, reduction in TSS is 87% and reduction in VSS is 61%, conductivity is 41%, oil and grease is 90%, total phosphorous is 94%, total nitrogen is 67% and TOC is 95% by the influence of the polyelectrolyte aluminium chloride. Optimum dosage of bentonite clay is 500mg/l, optimum pH is 6 and optimum time 45min. The reduction in turbidity for the fishing industry waste water is 62%, reduction in BOD3 is 58%, reduction in COD is 61%, reduction in TSS is 80% and reduction in VSS is 73%, conductivity is 40%, oil and grease is 81%, total phosphorous is 92%, total nitrogen is 50% and TOC is 94% by the influence of the polyelectrolyte bentonite clay. Optimum dosage of ferrous sulphate monohydrate is 300mg/l, optimum pH is 7 and optimum time 45min. The reduction in turbidity for the fishing industry wastewater is 18%, reduction in BOD3 is 49%, reduction in COD is 56%, reduction in TSS is 69% and reduction in VSS is 39%, conductivity is 30%, oil and grease is 76%, total phosphorous is 93% and TOC is 94% by the influence of the polyelectrolyte ferrous sulphate monohydrate. There is no change in fecal coliform and ammonical nitrogen by the effect of these polyelectrolytes. Similarly there is no change in total nitrogen by the effect of ferrous sulphate monohydrate.