We would like to biologically treat our effluent waste to reduce our sulphates content in the effluent discharge through the municipal sewer and reduce the COD as well. We're currently sorting out license with the municipality to install the required equipment in our plant (such as aeration tanks).
Sulfate can be removed easily through treatment with hydrated lime. COD can be easily removed by activated sludge. However, if you want to reduce both then it may be difficult. The preferred strategy is to use anaerobic treatment, with enriched sulfur-reducing bacteria. But they are several complications, depending on the actual sulfur concentration.
Thank you Parashant, it is more likely that I will use anaerobic for Sulphates followed by aerobic treatment for COD (using AS as you've alluded to). Currently my sulphates content in the waste water is above 1500 mg/l.
For treatment of such effluent first anaerobic treatment should be done it should be followed by aerobic treatment such as ASP or SAFf or MBBR.
Anaerobic treatment are generally more efficient in removing sulfates as hydrogen sulfide gas, another alternative would be to use microalgae, they use these and other ions such as nitrates, phosphates, etc. to produce biomass.
For decrease of sulphates, anaerobic treatment is good but may reduce by lime addition
Lime addition is the better option to reduce the Sulphate in Effluent streams
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