What could have caused coloration of dairy industry effluents after it has gone through allophanic soil columns?

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Tephra subsoil (allophanic) columns are used to determine the soil phosphorus (P) sorption capacity to remove P from dairy industry wastewater (pH = 8, with high sulfate concentration). The effluents collected had shown coloration - pale yellow to intense yellow although the influent was colorless. Could it be due to the presence of iron or silicate or can there be other reasons?
 

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Sameer Dohare
Very good question.
Also, looking for the answer.
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Jaspreet Kaur
You ned to study physicochemical parameters like pH (for both effluent and influent) temp, color, DO, BOD, COD, TDS, TSS, TS, Chloride Sulphate, Oil & grease also. to understand cause of coloration.
As you using allophanic filters, which helps to reduce the coloration of iron containing waste water. I guess, Iron is not the cause.
May Cheuyg
Hi Jaspreet,

Thank you for your reply. I have asked another soil scientist and he noted that colouration may have been due to the leaching out of iron/al oxides. I am also wondering if this could be due to precipitation of phosphate?
Sara S
Various physicochemical techniques have been studied for their applicability in treatment of wastewaters . Like sedimentation, screening, aeration, filtration, flotation, degassification, chlorination, ozonation, neutralization, coagulation, sorption, ion exchange, etc. Several limitations of physicochemical methods including partial treatment, higher cost, generation of secondary pollutants, higher quantity solids and use of chemicals agents make the biological methods a favorable alternative for the removal of pollutants. Waste materials associated with the food industry including the wastes generated by the dairy industry namely sludge, heavy organic matter, fats, oil & grease, fatty acids, nitrogenous compounds are notables.
Dairy wastewater deserves special attention since its levels of potential contaminants typically exceed those levels considered hazardous for domestic waste-water. May, what is the concentration of Sulphate? It will make me understand the situation at site, then I may be of some help.
May Cheuyg
Hi Sara,
Thank you for your reply. The concentration of sulfate ranged from 200 - 400ppm with initial pH of around 8.3.
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