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Practical Report-7 Alum Dosage Concentration

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    Royal University of Bhutan College of Science and Technology Rinchending: Bhutan Environmental Engineering Academic Year 2014, Winter Semester Tutor: Tadashi Takahashi Civil Engineering Department   Practical Report-VII: Optimum Alum Dosage Group ID: B-1 Submission Date: 7 th /11/2014 Submitted By:  EDC2011041; Sanjit Kumar  EDC2011051; Tashi Zangmo  EDC2011052; Tenzin Norbu  EDC2011053; Tenzin Zam  EDC2011054; Thinley Gyelmo  EDC2011055; Tshering Cheki  Optimum alum dose Significance of experiment It is necessary to consider various factors for determination of the quantity of flocculants in the coagulation treatment .(quantity of turbidity, quality of suspended matter, pH, coexistence material,etc) Therefore, the quantity of floculant is set experimentally. Principle of measurement 2.1, The jar-test test: Adds flocculant of the different density in plural beakers (i.e.,  jar) with same stirring condition and find the best additive rate that showed the best cohesiveness. 2.2, By the coagulation process, it is important that mixing flocculant uniformly rapidly. 2.3,We must be careful that settle ability will be worsening if flocculant becomes superabundant Procedure  Apparatus   Results Sample No. Alum Dosage Alum Concentration (mg/l) Turbidity (NTU) pH Value 1 1 20 32.3 6.6 2 4 80 25.4 5.9 3 8 160 22.5 5.4 4 12 240 28.4 4.0 5 16 320 35.2 3.5 Optimum Alum Dosage : 160 mg/l Graph y = -0.2121x + 6.8091 R² = 0.9805 0.05.010.015.020.025.030.035.040.0024681012141618    T  u  r   b   i   d   i   t  y    (   N   T   U    )  a  n   d  p   H    V  a   l  u  e  Alum Dosage Concentration (ml) Turbidity VariationTurbidity Variationy = -1E-08x 4  + 6E-06x 3  - 0.0004x 2  - 0.1144x + 34.712 0.05.010.015.020.025.030.035.040.0050100150200250300350    T  u  r   b   i   d   i   t  y    (   N   T   U    )  Alum Concentration (mg/l) Optimum Alum Dosage-Tubidity    Calculation By differentiation method: (assuming the alum dosage concentration variation to be of power 4) y = -1E-08x 4  + 6E-06x 3  - 0.0004x 2  - 0.1144x + 34.712 Comments and Impression : EDC2011041: Sanjit Result: Optimum Alum Concentration: 160 mg/l Discussions:     Amount of alum dosage required for coagulation depends on the turbidity of raw water.    The use of optimum amount of coagulant is indicated by the formation of large feathery flakes and approximately determined by Jar Test.    The revolution speed of the stirrer is very important. Rapid mixing causes disperse the chemicals and slow mixing causes floc formation. y = -0.2121x + 6.8091 R² = 0.9805 0.01.02.03.04.05.06.07.0024681012141618   p   H    V  a   l  u  e  Alum Concentration (mg/l) pH Value Variation

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