EVEG 3110_HW_1_Assigned_01_30_24_moe (1)

Problem 4. A receipt of surface water sample is given in Table below: Substance Concentration (mg/L) Total Hardness 1000 mg/L CaCO3 Phenolphthalein acidity 5 mg/L CaCO3 Phenolphthalein Alkalinity 3 mg/L CaCO3 It is known that phenolphthalein alkalinity is only due to CO3²- and phenolphthalein acidity is only due to H₂CO3. Assuming the hardness of sample is because of calcium and magnesium ions, alkalinity-acidity are due to the carbonate species, calculate: a) The pH of sample. b) Temporary and permanent hardness as mg/L CaCO3. c) Total alkalinity and acidity as mg/L CaCO3. Molecular weights (g/mole): Ca = 40, Mg = 24, H = 1, C = 12, 0 = 16

Subject: Environmental Engineering

QUESTION 4 Adding 20ml sample to a 300ml DO bottle causes its dissolved oxygen concentration to decrease by 10 mg/l. by the end of the first day What is the BOD1 of the sample? Answer mg/L

Calculate Total Solids (TS), Total Dissolved Solids (TDS) and Total Suspended Solids (TSS) in mg/L from the following data of a water sample. All beaker weights were measured after a full day in the oven. Sample amount (mL): 250 Weight of beaker (g): 106.5113 Weight of beaker + solids before filtration of sample (g): 106.5603 Weight of beaker (g): 120.5748 Weight of beaker + solids after filtration of sample (g): 120.6123

Sanitary Engineering Potential of Hydrogen (pH) same question please help me:   1-What are alternative methods for determining the pH of aqueous samples?2- What are typical pH values of drinking water in Jordan? How do your datacompare with these values?3-Discuss the relationship between (a) pH and hydrogen ion concentration (b) pHand hydroxide ion concentration?

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Determine the preak point dosage of chlorine given the data below which was obtained from chlorination experiment. 5 6 7 Dosage(mg/L) Required Cl₂Cmg/L 0.2 0.45 1.05 2.75 4.5 5.15 6.03 1 2 3 4

Given concepts of water quality: Some of the more important general water quality parameters can be listed as (a), (b), and (c). Solids present in water can be evaluated through size exclusion by using a glass fiber and removing the water from each fraction in an oven at 103 °C. Once dried, the solids left behind can be weighed and three subcategories of solids can be determined: three categories can be further subdivided into furnace) and (d), (e), and (f) all (g) (lost during ignition at 550 °C in the (h) (remain in the dish after ignition at 550 °C). All terms are listed in the singular (solids is not a valid answer for a, b or c), there are no acronyms, or compounded terms. Allare single words. a) ; b) d) e) : e) ; f) ; h)

Topics Covered: Water Quality 1. Wastewater samples were prepared and incubated at 20°C for 5 days for BOD analysis. Sample dilutions and the corresponding initial and final dissolved oxygen concentrations are summarized in the following table. Using the correct dilutions, estimate BOD5. Estiamte ultimate BOD if the BOD rate constant is 0.36/d. Bottle Sample Volume Initial Final DO DO 1 1 9.1 8.5 9.0 6.3 15 9.0 1.2 40 8.9 0.2 234

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The chlorine demand test conducted in a laboratory for raw water samples is tabulated below. Sample A B с D E F G H I Chlorine dosage (mg/l) 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 Residual chlorine (mg/l) 0.15 0.31 0.48 0.60 0.55 0.24 0.45 0.65 0.85 What is the breakpoint dosage and chlorine demand at dosage of 1.4 mg/1 respectively?

Subject is Environmental Engineering

Waste Water Question 3: The following observations were made on 2% dilution of wastewater: Dissolved oxygen of aerated water used for dilution = 0 mg/l Dissolved oxygen of diluted sample after 5 days = 0.6 mg/l Dissolved oxygen of original sample = 2.0 mg/l The BOD of 5 days of the sample is:

Wastewater Engineering civil engineering (2)

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al 2. Please design a Type II settling tank that receives a 1000 m3/day of a waste stream, after flocculation, that displays the following settling behavior. The initial concentration for this test is 500 mg/L. Time (min) 5 10 20 30 40 50 60 75 1 meters 2 meters 481 418 331 270 225 193 154 133 490 456 425 361 325 279 240 198 3 meters 495 483 463 413 369 333 290 259 Concentrations are in mg/L If the required removal rate is 50%, how large should the tank be?

A sample of water from a surface stream is analyzed with the following results: Calcium = 98 mg/L, Chlorine = 89 mg/L, Bicarbonate = 317 mg/L Magnesium = 22 mg/L , Potassium = 71 mg/L, Sulphate = 125 mg/L i) Draw a bar diagram for the water, il) Determine the alkalinity of the water, ili) Determine the total hardness, carbonate hardness and non carbonate hardness for the water.

Specific gravity is calculated by the formula: S.G. = density of sample/density of water at a given temperature Using the table below, compute the specific gravity of assigned samples (density data provided) at 4 deg., 20 deg., and 25 deg. Centigrade as standards. Tab. 1. Temperature dependence of distilled water density ρH2O. t [°C]   ρH2O [g/cm3]  15       0.99996 16        0.99994 17        0.99990 18        0.99985 19        0.99978 20        0.99820 21        0.99799 22        0.99777 23        0.99754 24        0.99730 25        0.99705    Sample                                  Density a. Citronella                          0.882 b. Eucalyptus                        1.465 c. Lemongrass                       0.890 d. Tea Tree Oil                       0.895 e. Wintergreen                     1.182

A laboratory provides the following analysis obtained from a 500-mL sample of wastewater. 105 °C 550 °C 200 a) b) Net mass of residual solids without filtering (mg) Net mass of residual solids on the filter (mg) Net mass of residual solids passing through the filter (mg) 75 What is the concentration of the total suspended solids in this sample? What is the organic matter percentage of the total solids? 120 30

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Solids analysis is one of the most widely used parameters for assessing water quality. Use the following data to determine (a) total solids (TS); (b) volatile solids (VS); (c) dissolved solids (DS); (d) total suspended solids (TSS), and (e) total volatile suspended solids (TVSS) all in mg/L. A sample volume of 150 ml was used in performing all solids analyses. Tare mass of evaporating dish = 24.3520 g Mass of evaporating dish plus residue after evaporation @ 105°C = 24.3970 g Mass of evaporating dish plus residue after ignition @ 550°C = 24.3850 g Mass of Whatman filter and tare Mass of Whatman filter and tare after drying @ 105°C Residue on Whatman filter and tare after ignition @ 550°C = 1.5103 g 1.5439 g 1.5199 g

A laboratory provides the following analysis obtained for a wastewater sample: Total Solids = 200 mg/L %3D Total Suspended Solids 160 mg/L Fixed Suspended Solids 30 mg/L %3! Volatile Suspended Solids = 120 mg/L What is the concentration of the Total Dissolved Solids of this sample?

After three days, the BOD concentration in a water sample was determined to be 75 mg/lt with a response rate constant of 0.345/day. Calculate the quantity of BOD remaining in the water sample after ten days.

H Gy Q#4:The table shows data of a wastewater sample collected from a river with a temperature of 30 °C analyzed for the BODs test. The rate constant is 0.2 day-¹ at the lab temperature (20 C). Find BODs at the river. Initial dissolved oxygen, mg/L 9 What will be the BOD7 at the river? Final dissolved oxygen, mg/L 3.5 Sample volume, ml 35