(k) During biological N removal, what happens in the anoxic zone?i) NOx generationii) High in NOxiii) Converting NOx to N2iv) No additional organic addition(1) Which EPA requirement should be fulfilled to apply biosolids to land without furtherpathogen regulation?i) Class A requirementiii) 1st biosolids requirement(m) Which is more acutely toxic?i) LD50 5 mg/kg BWii) Class B requirementiv) Class 1 requirementii) LD50 1000 mg/kg BW(n) Under what circumstances can a registered engineer sign and seal plans or documents he/shedid not prepare?i) Registered engineers can coordinateprojects that include segments that they arenot competent in if a qualified registeredengineer signs and seals plans or documentsfor those segments of the projectiii) If the plans or documents were preparedby someone under the registered engineer'sdirect supervision and the registeredengineer is an expert in the subject matter.ii) Under no circumstances.iv) When practicing in a state different thanthe one in which the engineer is registered.(o) Which approach treats the most municipal solid waste in the US?i) Landfillingiii) Recyclingii) Combustioniv) Composting

(k) During biological N removal, what happens in the anoxic zone? iii) Converting NOx to N2 (l)…

Answered: (k) During biological N removal, what…

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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(iii) Name two biological processes that operate in a fixed film-growth mode? (iv) The ABC Citizens Waste Water Treatment Plant uses ferric chloride. a) What is it used to remove from the wastewater? b) In which process is the ferric chloride added
A new manufacturing plant is being constructed upstream of the inflow air vent of the factory which causesthe air inflow into the factory to have a PM2.5 concentration of 210 ug/m3. A stronger air purifier is requiredto treat the additional PM2.5 concentration exiting the factory. Determine the removal efficiency of the newair purifier to ensure that the local PM.25 standard is not exceeded
2. The raw water to be coagulated has a pH of 7.5, determine how much alkalinity the water must have for the addition of 150 mg/L alum without affecting the pH.
A water treatment plant treating 100,000 gallons/day has discovered that their source water is contaminated with 1,1,1-Trichloroethane from an industrial spill. The 1,1,1-Trichloroethane concentration in the source water is 0.30 mg/L (Co). The treatment plant must reduce the concentration to meet the MCL. Batch experiments with PAC have shown that equilibrium adsorption is reached in less than two hours. Using the data in Appendix E in MWH, 2012 (or similar reference), determine the required reactor volume, PAC dose (mg/L) and PAC daily usage rate (kg/day) for a powdered activated carbon treatment process.
An industrial waste with a flowrate of 110 L/min contains 40 mg/L of zinc. Calculate: 1.) the pH required to maintain a zinc concentration of 2.6 mg/L (EPA's industrial limit for discharge into a sanitary sewer), and 2.) the dose of hydrated lime (Ca(OH)2) required (g/min).
Which of the following is not a piece of EPA legislation designed to protect the environment? Clean Water Act Clean Air Act O Civil Rights Act ORCRA D Question 2 What water contaminant was responsible for the 2014 Flint, Michigan water crisis? O Mercury Lead O PCB Giardia Question 3 What condition must be satisfied for us to use the Continuously Stirred Tank Reactor (CSTR) approach? Uniform well-mixed conditions Mixing occurs only in the axial direction The substance is conservative There is only one inflow channel D Question 4 A plug flow reactor is O Less efficient at removing pollutants than a CSTR Has the same efficiency at removing pollutants as the CSTR More efficient at removing pollutants than a CSTR Can be more or less efficient than the CSTR depending on the pollutant
2. Cadmium is a pollutant of concern in mining. The initial concentration of cadmium in a mining wastewater (also called acid mine drainage) is 0.1 mg/L, and the EPA Maximum Contaminant Level (MCL) is 0.005 mg/L. What must the pH be so that the wastewater does not exceed the EPA MCL? Given: Cd(OH)2 → Cď²* + OH (unbalanced) K, = 5.33 x 1015 Cd(OH)2: Cd2+ = 112.4 g/mol 17.0 g/mol = 146.4 g/mol OH- =
An effluent stream sample (500 mL) from a metal-working facility contains 0.52 g nickel sulphate. (i) What is the nickel concentration of this effluent stream (in mg/L)? (ii) Would you regard this concentration as suitable for discharge to the local sewage system? (iii) How much total nickel (in kg) leaves the facility per year in this stream if ~1 ML of effluent is produced?
The Rajasthan river water suspended matter and particles is quite low at the Kanowit tributary. The planned water treatment plant source of raw water intake is the kanowit tributary. Proposed a suitable process to be adopted is designing the treatment plant. Justify the selected sequence proposed.prescribe the chemicals required in each step if any.
3. When IWW is discharged untreated to environment, which pollutants cause the depletion of natural oxygen resources: a. Suspended solids b. Nutrients OHeavy metals d. Chemical biodegradable organics 4. Which content of IWW cause the accumulation of deposits and sludge: a. Physical suspended solids 6)Nutrients (N, P) c. Dissolved organic solids d. Chemical biodegradable organics 5. One of followings is NOT an objective purpose of oxidation: @Converting undesirable chemical species to species such as (Mn, CN ) to harmless materials b. Oxidize of organics such as: phenol, amines, odors, colors OKilling of bacteria, and algae d. Reduce pH, alkalinity, turbidity and hardness
Given the following octanol water partition coefficients (Kow), indicate for which compounds is soil vapor extraction (SVE) a candidate process for removing the compound from the vadose zone of a contaminated soil. Assume that low values of Kow are <10. Provide a relative ranking of contaminants in terms of potential efficiency for SVE treatment. Compound Log Kow Trichloroethene 2.38 4.88 6.01 1.38 3.15 1.46 3.9 6.19 0.26 Pyrene PCBs Vinyl chloride Ethyl benzene Phenol Lindane DDT 2-Butanone (methyl ethyl ketone)
Jar testing was performed using alum on a raw drinking-water source that contained an initial turbidity of 20 NTU and an alkalinity of 35 mg/L as CaCO3. The optimum coagulant (alum: Al2(SO4)3•14H20) dosage was determined as 18 mg/L with a final turbidity of 0.25 NTU. Determine the quantity of alkalinity consumed as mg CaCO3 (1 significant figure)

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