Marble wastewater is already alkaline in nature due to CaCo3, but also need pH and coagulant dosage to remove Total Suspended Solids (TSS)
This seems odd.
How do you know that you should add more alkalinity in order to remove suspended solids from such water?
Calcium carbonate is less soluble in water. At equilibrium state only 40 mg/L CaCO3 will be available to neutralize the H+ ions produce by a coagulant (Alum). Therefore, to accelerate the process of coagulation and save time a calculated amount of alkalinity in the form if sodium carbonate or bicarbonate will be required. In this way the process of coagulation is not only initiated but accelerated too. If time is not a problem, the produced H+ ion will react with the available CaCO3 and will help out the settling process, but a little slow.
Prof. Henrik
Recent studies shows that the coagulant like ferric chloride, alum and aluminium chloride are used as coagulant additives to treat wastewater of marble and other natural stone processing industries. one of response surface method is used to optimize the operating variables such as coagulant dosages and pH to remove TSS. Our lab analysis results also shows that the highest removal efficiencies of TSS and turbidity using coagulants dosages at high pH. we used two other different coagulants in this experimentation which have shown good results in the basic pH too.
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