In one of the industrial zones, sewage is treated to produce usable fertilizers and arable water by removing polluting materials from it. If you know that 12% of polluting materials are removed in one hour. A- What is the percentage of sewage water that can be treated in one day? (Calculate 24 working hours today) B-How many hours does it take to treat 10% of the sewage? C- How many hours does it take to treat half of the sewage water?

In one of the industrial zones, sewage is treated to produce usable fertilizers and arable water by removing polluting materials from it. If you know that 12% of polluting materials are removed in one hour. A- What is the percentage of sewage water that can be treated in one day? (Calculate 24 working hours today) B-How many hours does it take to treat 10% of the sewage? C- How many hours does it take to treat half of the sewage water?

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

Problem 3: You are considering three design alternatives for treating a pollutant in wastewater using a first- order process (k = 1.1 min'). The flow is 8.6 million gallons per day (mgd). The three alternatives, each of which has a total volume of 9,000 gallons, are: (1) one 9,000 gallon well-mixed basin; (2) two 4,500 gallon well-mixed basins in series (see sketch below); and (3) one 9,000 gallon pipe. Calculate the percent removal of the pollutant for each alternative at steady state. Which system gives the best removal? Two tanks in series
You are provided with the following information about a municipal wastewater treatment plant. This plant uses the traditional activated-sludge process. Assume the microorganisms are 46 percent efficient at converting food to biomass, the organisms have a first-order death rate constant of 0.04/day. There are 150,000 people in the community (their wastewater production is 225 L/day-capita, 0.1 kg BOD5/capita-day). The effluent standard is BOD5 = 20 mg/L and TSS = 20 mg/L. Suspended solids were measured as 4,300 mg/L in a wastewater sample obtained from the biological reactor, 15,000 mg/L in the secondary sludge, 200 mg/L in the plant influent, and 100 mg/L in the primary clarifier effluent. Volume is 4.6 million liters. Assume 30 of incoming BOD is removed during primary treatment so 70% reaches the aeration basin. What is the mean cell residence time in days?
The wastewater to be treated is flowing into the treatment plant at a rate of 2670 m3/day. The dosage of chlorine used for disinfection is 15 mg// and its disinfection model is given as N=Noe0.145t_ Calculate the volume of disinfection tank necessary to kill 98% microbes.
A wastewater sample contains two nitrogen species, namely ammonia and nitrate. Consider the atomic weight of N, H, and O as 14 g/mol, 1 g/mol, and 16 g/mol, respectively. In this wastewater, the concentration of ammonia is 34 mg NH3/liter and that of nitrate is 6.2 mg NO3/liter. The total nitrogen concentration in this wastewater is milligram nitrogen per liter. (round off to one decimal place)
PLEASE ANSWER QUESTION D You have been contracted to determine the characteristics of raw water at 20°C. You complete a chlorine dosing experiment to aid in designing your chlorination process (Figure Below).a. What is the breakpoint chlorine dosage?b. What is the chlorine demand at a chlorine dosage of 1.2 mg/L?c. For a plant that processes 10 m3/hr, how much chlorine should I add per day to reach a constant residual chlorine concentration of 0.7 mg/ld. Design a chlorine contact tank that would achieve the required Ct value for a 3 log deactivation of Girardia (Ct = 54 mg/l min).
ENVIRONMENTAL ENGINEERING-WATER POLLUTION: Incoming wastewater, with BOD5 equal to 200mg/L, is treated in a well-run secondary treatment plant that removes 90% of the BOD. You are to run a five-day BOD test with a standard 300mL bottle, using a mixture of treated sewage and dilution water (no seed). Assume the initial DO is 9.2 mg/L. FIND: Roughly what maximum volume of treated wastewater should be put into the bottle in you want to have at least 2.0 mg/L of DO at the end of the test (filling the rest of the bottle with water)? If you make a mixture of half water and half treated wastewater, what DO would you expect after five day?
1. Based on the water filter activity, how would you design a water filter to clean the water you would be using at home? a. What pollutants would you need to filter out? b. What materials would you use to filter each kind of pollutant?
11.61 A 4.0% sodium fluoride solution is applied to increase the fluoride concentration from 0.4 to 1.0 mg/l in a municipal water supply. (a) What is the application rate of NaF solution in gal/mil gal? (b) How many pounds of commercial-grade sodium fluoride are needed per million gallons?
Select the most suitable treatment for wastewaters given below. Justify your answer for the treatment of each wastewater. Wastewater Optimum Explanation treatment 50 mg/L NO3-N 2 ug/L PCBS 1500 mg/L Ca2+ 50 mg/L Hydrogen sulfide (H2S)
Coming home after the end of the winter semester, you find that your family’s swimming pool has not be maintained well. In particular, it has no chlorine residual at all, and it is full of tree leaves. You buy a concentrated chlorine solution (1% as Cl2) and begin to meter it into the pool at a rate of 100 mL/hour. The pool has a volume of 200 m3. You also add new water, and remove in-pool water, at a rate of 3.785 L/minute. The chlorine reacts with the organic matter in the with a rate of 0.5/hour. How long will it take to get the Cl2 residual up to 1 mg/L if you add Cl2 continously.
Determine how much extra volume is needed to treat the following wastewater in a CSTR than in a plug flow reactor. • Influent TOC: 273 mg/L • Required Effluent TOC: 57.0 mg/L • Flow: 792,500 gallons/day • First Order Microbiological Rate Coefficient (k’): 5.98/day Answer: 295,000 gallons 2. Discuss in detail at least two ways the k’ value may have been obtained and which technique is probably more accurate?
in simple terms, explain how to use a lagoon and evapotranspiration in wastewater processing and disposal.