Advantages and disadvantages of coagulation and flocculation
Answers
ADVANTAGES and DISADVANTAGES==>
Particular pollutants can be removed from the wastewater using coagulation/flocculation, which would otherwise be impossible without adding these chemicals.
Limited investment is required for these tanks and dosage units. However, a major disadvantage of this technique are the operational costs. In some cases, considerable quantities of coagulant and flocculant are needed to achieve the required level of flocculation. A certain quantity of physico-chemical sludge is also formed, which is normally processed externally. These costs can escalate, particularly with large volumes of wastewater.
The correct dosage of chemicals is also very important for the process to work correctly. This is not straightforward with wastewater with a widely varying composition. Effective buffering of wastewater offers a good solution in this case.
The accuracy with which chemicals must be dosed, makes this a complex process.