Ask Question, Ask an Expert

+1-415-315-9853

info@mywordsolution.com

Ask Other Engineering Expert

problem1. A water treatment plant uses a dual media filter. The two media employed are:

i) Anthracite coal with effective diameter of 1.1 mm, porosity of 0.6, and shape factor of 0.5.

ii) Sand with effective diameter of 0.5 mm, porosity of 0.45, and shape factor of 0.7.

The complete filter depth is 0.8 m with 0.5 and 0.3 meters of anthracite coal and sand correspondingly. Compute the total head loss in the clean filter if the loading rate is 200 m3/m2.day and operational temperature is100C.

problem2. A conventional surface water plant with flocculation, coagulation, sedimentation, and filtration produces filtered water with turbidity less than 0.3 NTU, pH 7 and temperature 10oC on a day when the peak hourly flow is 3.0 MGD.  After filtration, the water is chlorinated in a baffled reservoir.  For the peak hourly flow rate, t10 is 90 minutes.  What is the needed disinfection for the removal of Guardia cysts of the filtered water if free chlorine is employed?  The raw water microorganism concentration is <1/100 L.

Note: According to regulations, the free residual chlorine in water entering the distribution system can’t be less than 0.2 mg/L for more than 4 hours and a residual in distribution system should be detectable in at least 95% of the samples tested each month. 

problem3. The transmission main from the well field to the community is 2500 ft, the velocity of flow at peak pumping capacity is 3.5 fps, water temperature is 10oC, and pH is 7.5.  If free chlorine residual is applied at the well field and is 0.5 mg/L entering the distribution system, what is the log inactivation of viruses? 

problem4
. As part of their proposed latest research treatment plant, City of St. James is planning to employ five banks of rapid sand filter after their sedimentation tanks.  Each bank of sand filters has six filters operated in parallel.  Each filter bed has a surface area of 3m X 2m.  The design flow rate is 0.044 m3/second.  If the design loading rate to filter is 150 m3 /day. m2, compute the following:

i) What total filter surface area should be provided and how many banks of filters need to be operational?

ii) What is the loading rate when one filter is out of service?

Note: Experiments conducted with rapid sand filters at nearby water treatment plants have demonstrated that satisfactory water quality can be received with rates as high as 235 m3 /day. m2.

problem5. A groundwater contains the following constituents to be treated by the lime-soda process to the minimum hardness probable has the subsequent features: 

CO2 = 62.0 mg/L        HCO3- = 250.0 mg/L as CaCO3
Ca2+ = 80.00 mg/L        Cl- = 35 mg/L
Mg2+ = 36.6 mg/L        SO42- = 96.0 mg/L
Na+ = 23.0 mg/L
The facility is to treat 50 x 106 L/day of water from this source using lime-soda ash to     reduce the hardness.

i) Find out the total hardness, carbonate hardness, and non-carbonate hardness in mg/L as CaCO3.

ii) Find out the lime and soda-ash dosages for softening (units of kg/day).  Assume that the lime is 90 percent CaO by weight and the soda ash is pure sodium carbonate.

problem6. A water treatment plant is processing 19,000 m3/day of water.  A settling basin for Type- 2 suspension will remove 100 percent of all particles which has a settling velocity of 0.75 m/hour.  The basin has an average depth of 3.5 meters and the weir overflow rate is 8m3/m.hour. 

Find out:

i) Dimensions of each basin

ii) Detention time

iii) Weir length for each basin.

 Suppose there are 3 basins with a rectangular unit in that the length is 3 times the width.

problem7. Why is there a concern for dissolved organics and color in water supply and in water treatment plant?

Other Engineering, Engineering

  • Category:- Other Engineering
  • Reference No.:- M9855

Have any Question? 


Related Questions in Other Engineering

Short answers of 150-400 words1 engineering and

Short answers of 150-400 words 1. Engineering and architecture are two fields of knowledge that continually intersect and bifurcate in the period that we have been studying. What is relationship between architecture and ...

Problem 1a router is used to cut locating notches on a

Problem 1 A router is used to cut locating notches on a printer circuit board. The vibration level at the surface of the board as it is cut, is considered to be a major source of dimensional variation (lower the better) ...

Diode circuits1 the 6v zener diode below has zero zener

Diode Circuits 1. The 6V zener diode below has zero Zener resistance and a knee current of 5mA.The minimum value of R, so that the voltage across it does not fall below 6V is 2. A zener diode in the circuit shown in belo ...

Robotics assignment-investigation into the control of an

Robotics Assignment- Investigation into the control of an electric motor using MatLab. An electric motor can be described by  the following two coupled second order differential equations, see the PowerPoint notes for a ...

Assignment air traffic control systemconsider the following

Assignment: Air Traffic Control System Consider the following goal model fragment for an air traffic control system shown below. The parent goal roughly states that aircraft routes should be sufficiently separated. The r ...

Problem 1find the maximum likelihood ml test for a single

Problem 1. Find the Maximum Likelihood (ML) test for a single observation x(0) to distinguish between H 0 and H 1 if H 0 : P x (0)(x(0)) = 1/2exp (-|x(0)|) H 1 : P x (0)(x(0)) = 1/2exp (-|x(0) - A|) when A > 0. Find the ...

1 represent the following decimal numbers in both binary

1. Represent the following decimal numbers in both binary sign/magnitude and two's complement using 16 bits: -29. 2. A Computer uses IEEE-754 format to represent floating points. What value (in decimal) the computer repr ...

Assignmentdiscussionanalog integrated circuits amp

Assignment Discussion Analog Integrated Circuits & Lab Op-Amp Application and Datasheets Directions: Please answer BOTH of the questions and respond to a minimum of two of your classmates. Question A Discuss why it is im ...

Electronics assignment1 using pspice simulation print the

Electronics Assignment 1. Using PSpice simulation, print the waveforms of the following values for the circuit below (V S =100 mVpp, 1kHz). You can choose any npn transistor for the transistors in the circuit. a. Operati ...

Assignmentradio frequency applications and

Assignment Radio Frequency Applications and Feedback Directions: Please answer BOTH of the questions and respond to a minimum of two of your classmates. Question A Discuss some important op amp parameters needed for radi ...

  • 4,153,160 Questions Asked
  • 13,132 Experts
  • 2,558,936 Questions Answered

Ask Experts for help!!

Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

Ask Now Help with Problems, Get a Best Answer

WalMart Identification of theory and critical discussion

Drawing on the prescribed text and/or relevant academic literature, produce a paper which discusses the nature of group

Section onea in an atwood machine suppose two objects of

SECTION ONE (a) In an Atwood Machine, suppose two objects of unequal mass are hung vertically over a frictionless

Part 1you work in hr for a company that operates a factory

Part 1: You work in HR for a company that operates a factory manufacturing fiberglass. There are several hundred empl

Details on advanced accounting paperthis paper is intended

DETAILS ON ADVANCED ACCOUNTING PAPER This paper is intended for students to apply the theoretical knowledge around ac

Create a provider database and related reports and queries

Create a provider database and related reports and queries to capture contact information for potential PC component pro