Water treatment

The most important factor in coagulation- flocculation process control is: Select one: A. Adjusting the alkalinity B. Maintain the temperature C. Selection of the amount of chemical coagulant D. All of the above Alkalinity can be considered as Select one: A. Suspended impurities B. Dissolved impurities C. Colloidal impurites D. Both A&C Which of the following chemical compounds can be used to stop chemical precipitation in softening step: Select one: A. Carbon dioxide B. Carbon monoxide C. Sodium hydroxide D. soda ash