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Jar Test Lab(3) - Jar Test Lab University of Colorado CVEN...

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Jar Test Lab University of Colorado, CVEN 3424 Group D: Will Zweig Justin Walker Andrew Jensen Christopher Severs Steve Haag Preformed: February 21, 2008 at 9:30 AM Submitted: March 13, 2008
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Table of Contents List of Figures Figure 1 – Alum Dose vs. pH .............................................................................................. 5 Figure 2 – Alum Dose vs. Turbidity .................................................................................... 6 Figure 3 – Alum Dose vs. TOC ........................................................................................... 6 List of Plots Table 1 – Index of Sample Water Initial Conditions ........................................................... 3 Table 2 – Alum Dose per Jar ............................................................................................... 3 Table 3 – Mixer Speed / Process Simulation ....................................................................... 4 Table 4 – TOC Removal Requirements ............................................................................... 4 Table 5 – Turb./TOC Controlling Factor Determination ..................................................... 7 2
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Objective To determine the optimal coagulant doses needed to reduce the turbidity and natural organic matter (TOC) in water samples of various conditions. Approach 1.) Setup four stations, each with a set of six 2-liter “jars” and mixers. Figure 1 is a typical setup for jar test station. Designate a station to each of the four types of water to be tested (Boulder Reservoir Water, High Turbidity, High NOM, and Low pH/Low Alkalinity). Fill the jars with test water. 2.) Measure the initial concentrations for each set of jars, as summarized in Table 1, below. Table 1 – Index of Sample Water Initial Conditions Water pH Turbidity TOC UVA 254 Alkalinity Sample (NTU) (mg/L) (cm -1 ) (mg/L as CaCO 3 ) BRW 7.8 5.0 5.0 0.12 62 High Turb 7.8 50 7.4 0.18 62 High NOM 7.6 3.2 9.1 0.23 62 Low pH 6.2 3.2 5.0 0.12 40 3.) Set the mixer speed to rapid mix then add the amount of coagulant to each jar as specified by Table 2, below. Table 2 – Alum Dose per Jar Jar 1 2 3 4 5 6 Alum dose (mg/L) 0 5 10 20 40 80 Stock Vol Added (mL) 0 0.5 1.0 2.0 4.0 8.0 3 Figure 1 – Typical Jar Test Station Setup
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4.) Following Table 3, below, mix each jar for the specified amount of time. Table 3 – Mixer Speed / Process Simulation Simulated Mean Velocity Gradient, G Mixer Speed Mixing Time Process (s -1 ) (rpm) (min) Rapid Mix 600-800 200-400 .5-2 Flocculation 1 60-40 70-50 10-15 Flocculation 2 20-10 40-20 10-15 Sedimentation 0 0 15-60 5.) Measure and record the turbidity, pH, and TOC sample in each jar after sedimentation. 6.) Calculate the percent TOC removal and note alum dosages that met the TOC removal requirements, as indicated below in Table 4. Also, note alum dosages that met advisory target turbidity levels of 2 NTU for the high turbidity water and high NOM water samples and 1 NTU for the other two water samples.
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