Lab #4 Letter - Dr. Kauser Jahan Associate Professor of...

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Dr. Kauser Jahan Associate Professor of Civil and Environmental Engineering 33 Rowan Hall Glassboro, NJ 08028 Dear Dr. Jahan; We are submitting the results of the coagulation and flocculation analysis conducted for the Rowan Pond located in Glassboro, New Jersey. This body of water is categorized at surface water and is for visual and fishing purposes. The water sample was collected on October 19, 2011 at 1:30 PM and transported to the laboratory in a clear plastic container. The jar test, standard method ASTM D2035 – 08, was conducted by adding varying dosages of alum [Al 2 (SO 4 ) 3 ∙ 18H 2 O] to 900 mL of water, stirred, and then allowed to settle. The turbidity of each sample was taken and compared to the matching dosage. A figure showing the relationship between the data and the optimal dose of alum is attached for your convenience. Result indicate that the optimal dose of alum is 15.73 mg/L. Theoretically, if 1.42 mL of alum is added to 900 mL of Rowan Pond water, the final turbidity reading will be 8.30 NTU. If the dosage of alum were to surpass the optimal dose, the turbidity of the water would increase and the pH would decrease. A decrease in pH shows the water is becoming more acidic due to the production of carbonic acid [H 2 CO 3 ] and the decrease of alkalinity. Alum reacts with the alkalinity of the water and forms aluminum hydroxide precipitate. Please feel free to contact my team if you have any further questions. Thank you. Sincerely, Benjamin Lamac, Jake Taylor, Nick Vaspoli, Miken Shah Team Leader Rowan Hall Glassboro, NJ 08028 Email: lamacb14@students.rowan.edu Enclosure: Lab Report
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Laboratory 4 COAGULATION – FLOCCULATION Team 1 Ben Lamac, Nick Vaspoli, Jake Taylor, Miken Shah Environmental Engineering I, Fall 2011 CEE 08311 Section 2 Dr. Jahan 29 October 2011
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Laboratory 4: Coagulation-Flocculation, Jahan, 2 Abstract The purpose of this experiment was to gain an understanding of coagulation and flocculation processes used in water treatment, which is a vital stage in clarifying water. The coagulant used in experimentation was alum [Al 2 (SO 4 ) 3 ∙ 18H 2 O] in liquid form and was added to six samples of Rowan Pond water, each in different dosages. The standard method ASTM D2035 – 08, also referred to as the jar test of water, was conducted in order to find the optimal amount of alum that needs to be added to the water in order to lower its turbidity the greatest. The raw data seen in Appendix A was plotted, as seen in Figure 1 and a polynomial regression line was fitted to the data, as seen in Figure 2. According to the regression equation, the optimal dose of alum that should be added to Rowan Pond water was 15.73 mg/L. In theory, if 1.42 mL of alum is added to 900 mL of Rowan Pond water, it should reduce that turbidity of the water from the initial 18.8 NTU to 8.30 NTU. When the dosage of alum surpasses the optimal dose, the turbidity of the water increases while the pH decreases meaning the water is more acidic. Introduction
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This note was uploaded on 11/17/2011 for the course ENGINEERIN 1 taught by Professor Cag during the Spring '08 term at Rowan.

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Lab #4 Letter - Dr. Kauser Jahan Associate Professor of...

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