Midterm 1 study guide
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The midterm study guide covers various concepts in environmental engineering including acid-base chemistry equations, alkalinity definitions, BOD and reaction kinetics equations, unit conversions, and atomic weights. Sample problems involve calculating pH from acid addition, H2CO3 concentration from pH and HCO3-, and total alkalinity from ion concentrations in well water.
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![CE 441 - ENVIRONMENTAL ENGINEERING
Midterm #1 Study Guide
The following information will be given in solving the problems:
H2CO3 H+ + HCO3
Ka1 = 5.0 x 10-7 M @ 25oC
HCO3 H+ + CO3=
Ka2 = 5.0 x 10-11 M @ 25oC
+
H2O H + OH
Kw = 10-14 M @ 25oC
Alkalinity = [HCO3-] + [CO3=] + [OH-] - [H+] (all concentrations expressed as CaCO3)
BODt = BODultimate(1 - e-kt)
KT = K20(慮)T-20
For a batch reactor and 1st order reaction: Ct/Co = e-kt; t1/2 = ln2/k = 0.693/k
Mass loading rate (lb/day) = Q (in MGD) x C (in mg/L) x 8.34
1 ft3 = 7.48 gal, 1 gal = 3.785 liters, 1 m3 = 35.3 ft3
Atomic weight: H =1, C =12, N = 14, O =16, Na = 23, Mg = 24, Al = 27, P =31, S =32, Ca = 40,
Fe = 56, Cl = 35.5
I. True or False (1 pt each, 18 pts total):
1. ___ The unit of the rate constant of a first-order reaction (dC/dt = -kC) is unitless.
II. Fill the Blanks (1 pts each, 10 pts total):
1. MCL (for potable water) = Maximum ______________________________________ level.
III. Short answers (4 pts each, 12 pts total):
1. Write down the general equation describing change in concentration relative to time.
IV. Calculation problems (Show your calculations; 5 pts each, 60 pts. total)
1. If 98 mg of sulfuric acid (H2SO4) is added to two liters of water at 25 oC, what is the final pH?
[Note: Sulfuric acid is a strong acid and H2SO4 2H+ + SO4=]
pH = ________________
2. A water sample contains 10-4 M HCO3- at pH = 7, estimate the H2CO3 concentration.
[H2CO3] = _______________M
3. The results of a well water analysis are given as:
Na+ = 60 mg/L, Ca++ = 165 mg/L, Mg++ = 15 mg/L, HCO3- = 122 mg/L, CO3= = 20 mg/L, SO4= =
50 mg/L, Cl- = 30 mg/L.
Total alkalinity __________ mg/L as CaCO3.
1](https://image.slidesharecdn.com/midterm1studyguide-140206222516-phpapp02/85/Midterm-1-study-guide-1-320.jpg)
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This document contains 7 questions from an environmental engineering homework assignment. The questions involve calculating BOD levels and theoretical oxygen demand of ethanol in wastewater. Additional questions calculate TSS, VSS, TDS and FDS levels based on compound concentrations. Other questions determine the fraction of maximum oxygen consumption after 5 days, the rate constant and half-life for an ultraviolet ozonation reaction, and the monthly chlorine usage for a water treatment plant.Homework 7 due december 12
Homework 7 due december 12Richard Templin
油
This document contains 4 homework problems related to environmental engineering:
1) Calculating the minimum pond volume needed to achieve 80% BOD removal for a 1.0 MGD flow based on given conditions.
2) Estimating the ultimate BOD downstream of a wastewater treatment plant discharge into a receiving stream given effluent BOD, stream flows and BODs.
3) Calculating the soil volume required to cover 6,000 tons of municipal solid waste based on a given waste-to-soil ratio and waste density.
4) Estimating the average moisture content in a municipal solid waste stream based on given composition percentages and moisture contents for different components.Homework 6 due dec3
Homework 6 due dec3Richard Templin
油
This document contains instructions for 4 homework problems related to environmental engineering calculations. Problem 1 asks to calculate the volume of an aeration tank given parameters like flow rate, BOD loading, and MLVSS concentration. Problem 2 asks to calculate hydraulic retention times for continuous flow stirred tank and plug flow reactors treating wastewater. Problem 3 provides data to calculate organic loading rate, F/M ratio, and sludge wasting rate for an activated sludge process. Problem 4 gives specifications for a trickling filter to estimate hydraulic loading rate and effluent BOD.Full answer key to hw2
Full answer key to hw2Richard Templin
油
This document contains worked examples for an environmental engineering homework assignment on acid-base chemistry calculations. It includes calculating molarity, normality, and concentrations from other units. Example problems cover solubility products, pH calculations, alkalinity, and converting between ion concentrations and nitrogen concentrations. Step-by-step workings are shown for each multi-part question, demonstrating how to set up and solve the relevant chemical equations to obtain the requested values.Dec 3 haz waste
Dec 3 haz wasteRichard Templin
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This document provides an overview of hazardous waste management. It defines hazardous waste and discusses the key US regulations governing its handling - the Resource Conservation and Recovery Act (RCRA) and the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA). It also covers hazardous waste sources and health effects, risk assessment procedures, site remediation techniques, and various treatment technologies.1. 441 intro to environmental engineering peng
1. 441 intro to environmental engineering pengRichard Templin
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This document provides an overview of CE 441 - Introduction to Environmental Engineering, taught by Dr. Jian Peng at California State University, Fullerton. The course covers fundamental concepts in environmental engineering, including water and wastewater treatment processes, air pollution control, and environmental regulations. It aims to help students understand key environmental topics and prepare for engineering licensing exams. The document outlines the course goals, schedule, assignments, grading policy, and guest speakers.Week8
Week8Richard Templin
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This document provides an overview of a wastewater treatment course. It begins with an outline of course content including preliminary treatment, primary treatment, secondary treatment, advanced treatment, and sludge treatment. It then discusses why wastewater treatment is important to protect receiving waters and public health. Various unit processes are described at a high level, including wastewater collection systems, preliminary treatment like bar racks and grit removal, primary sedimentation, and secondary biological treatment processes like activated sludge. Key terms are also defined, such as BOD, TSS, and the 30/30 rule for secondary effluent quality.Ad
Midterm 1 study guide
- 1. CE 441 - ENVIRONMENTAL ENGINEERING Midterm #1 Study Guide The following information will be given in solving the problems: H2CO3 H+ + HCO3 Ka1 = 5.0 x 10-7 M @ 25oC HCO3 H+ + CO3= Ka2 = 5.0 x 10-11 M @ 25oC + H2O H + OH Kw = 10-14 M @ 25oC Alkalinity = [HCO3-] + [CO3=] + [OH-] - [H+] (all concentrations expressed as CaCO3) BODt = BODultimate(1 - e-kt) KT = K20(慮)T-20 For a batch reactor and 1st order reaction: Ct/Co = e-kt; t1/2 = ln2/k = 0.693/k Mass loading rate (lb/day) = Q (in MGD) x C (in mg/L) x 8.34 1 ft3 = 7.48 gal, 1 gal = 3.785 liters, 1 m3 = 35.3 ft3 Atomic weight: H =1, C =12, N = 14, O =16, Na = 23, Mg = 24, Al = 27, P =31, S =32, Ca = 40, Fe = 56, Cl = 35.5 I. True or False (1 pt each, 18 pts total): 1. ___ The unit of the rate constant of a first-order reaction (dC/dt = -kC) is unitless. II. Fill the Blanks (1 pts each, 10 pts total): 1. MCL (for potable water) = Maximum ______________________________________ level. III. Short answers (4 pts each, 12 pts total): 1. Write down the general equation describing change in concentration relative to time. IV. Calculation problems (Show your calculations; 5 pts each, 60 pts. total) 1. If 98 mg of sulfuric acid (H2SO4) is added to two liters of water at 25 oC, what is the final pH? [Note: Sulfuric acid is a strong acid and H2SO4 2H+ + SO4=] pH = ________________ 2. A water sample contains 10-4 M HCO3- at pH = 7, estimate the H2CO3 concentration. [H2CO3] = _______________M 3. The results of a well water analysis are given as: Na+ = 60 mg/L, Ca++ = 165 mg/L, Mg++ = 15 mg/L, HCO3- = 122 mg/L, CO3= = 20 mg/L, SO4= = 50 mg/L, Cl- = 30 mg/L. Total alkalinity __________ mg/L as CaCO3. 1