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Question: this first image is the question the second image has...

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2 Use reaction 6-10 to determine how much Alkalinity is destroyed when FeCls is added to water. Report as mg/L HCO3 andmg/L as CaCO3 This first image is the question. The second image has the reaction 6-10 that the question is referring to.

6-16 WATER AND WASTEWATER ENGINEERING the specifics of the product. Dry and liquid forms are available. The properties of iron with respe to forming large complexes, dose, and pH curves are similar to those of alum. An example of the reaction of FeCl3 in the presence of alkalinity is (6-10) Fecı3 + 3Hco; + 3H20 근 Fe(OH)3-31 120(s) + 3CO2 + 3C1- and without alkalinity FeCl3 +3H20 Fe(OH)3 3H20(s)+3HCI 6-11) forming hydrochloric acid, which in turn lowers the pH pIH and Dose Two important factors in coagulant addition are pH and dose. The optimum dose and pH must be determined from laboratory tests. The optimum pH range for alum is approximately 5.5 to 7.7 with adequate coagulation possible between pH 5 and 9 under some conditions (Figure 6-9a).

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