1. The community of Enviro, US (population 26,300) tests its drinking water supply forcoliform organisms by the fermentation tube method (five 10 ml portions per sample).The results for January, 2000 are tabulated below:No. of + portionsNo. of Samples2340525543210No. of - portions012345a) Calculate the monthly average MPN.b) Did the city comply with EPA regulations for sample frequency?c) Did the samples tested comply with the regulations? What would be considered a non-compliance?

To determine- 1) Monthly average MPN 2) Check for the city comply with EPA regulations for sample frequency 3) Tested sample comply with the regulations? what is Non Compliance ?Fermentation tube method is used to determine the presence of a member of a coliform group in surface or ground water. As it is tested for 5 samples then the positive value corresponding to 5 sample in +ve portion is 1 and the negative value corresponding to 5 sample is 1. therefore, from the table - No. of tubes giving +ve portions (10 ml) MPN index/100 ml 5 6.9 4 5.1 3 3.6 2 2.2 1 1.1 0 <1.1 1) Therefore, for average MPN taking first 5 sample - =6.9+5.1+3.6+2.2+1.15=3.78 ml Average MPN = 3.78 /100 ml

Engineering

Civil Engineering

1. The community of Enviro, US (population 26,300) tests its drinking water supply for coliform organisms by the fermentation tube method (five 10 ml portions per sample). The results for January, 2000 are tabulated below: No. of + portions No. of Samples N3TOS 2 4 0 5 25 543210 0 No. of - portions 0 12345

1. The community of Enviro, US (population 26,300) tests its drinking water supply for coliform organisms by the fermentation tube method (five 10 ml portions per sample). The results for January, 2000 are tabulated below: No. of + portions No. of Samples N3TOS 2 4 0 5 25 543210 0 No. of - portions 0 12345

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

The results of the COD analysis performed on a 100-mL sample containing 103 mg of glucose (C6H12O6) are given in the table below. The amount of FAS used for the blank and for the determination of the FAS normality is 9.92 mL and 20.34 mL, respectively. Calculate the COD concentration of the sample and comment on the COD to ThOD ratio.
A method known as multiple tube fermentation technique is used to check biological water quality. With reference to it choose the correct statements and use the following table for MPN calculations: Size of sample (ml) No. of positive tubes No. of negative tubes 1 1 0.1 2 3 0.01 3 0.001 1 4 Most probable number is a number which represents the bacterial density, which is most likely to be Correct Option present in the water. B The coliform actually is gram-negative, non-spore farming rod shaped bacteria that ferment lactose and the end products are alcohol and CO2. Volume of sample in negative tube is 1.334 ml. Correct Option D MPN/100 ml using Thomas equation is 331. Correct Option
A centrifuge dewaters digested sludge from ananaerobic digester. Pertinent performance data are; raw sludge feed rate to the anaerobicdigester = 60,000 lb/day on a dry solids basis, digester suspended solids removalefficiency = 55 percent, suspended solids concentration in digested sludge fed to thecentrifuge = 5.0 percent by weight, centrifuge cake solids concentration = 30 percent byweight, centrifuge solids capture = 90 percent. Sketch a process flow schematic of the system showing both the digester andcentrifuge and all flowing fluid streams, clearly identify the appropriate control surface(s)for mass balance analyses, and then determine;(i) dewatered sludge mass flow rate (lb/day)(ii) centrate flow rate (gal/day)(iii) centrate suspended solids concentration (mg/l).
An Analysis of water from a surface stream yields the following results Ca+2=60mg/L HCO3-=115mg/L Mg+2=10mg/L SO4-2=96mg/L Na+=7mg/L NO3-=10mg/L K+=20mg/L CI-=11 mg/L If an error of 10 percent is acceptable, should the analysis be considered complete?
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
Please upload your full solution to the following problem. A series of experiments was conducted in a batch reactor to assess the disinfection by chlorine of the protozoan Giardia lamblia. In each experimental run, the concentration of free available chlorine was varied and the time required to kill 99 percent of the organisms was determined. The results showed that a Ct value of 100 mg-min/L was sufficient to achieve 2-log removal. Assume that the Chick- Watson model holds with n = 1. A. What value is the psuedo-first order disinfection rate coefficient k (min ¹) when the chlorine concentration is 1 mg/L? B. At a chlorine concentration of 1 mg/L and a contact time of 10 minutes, what fraction of the G. lamblia organisms would be killed? C. At a chlorine concentration of 10 mg/L and a contact time of 5 minutes, estimate the fraction of the G. lamblia organisms that would be killed. 4
I need the answer as soon as possible
Solve it 11
Problem 4. A small community with a population of 25,200 is seeking your services as a consulting environmental engineer. They have tested their drinking water supply for coliform organisms by the fermentation tube method (five 10 ml portions per sample). They have come up with the following tabulated results for their April 2023 samples: No. of Samples 1 1 2 0 3 24 No. of + portions 5 4 3 2 1 0 No. of - portions 0 1 2 3 4 5 a. What is the calculated monthly average MPN? b. Just by looking at the calculated MPN can you comment on the safety of the drinking water of your client? -coliforms/100 ml.
11 Aerobic digestion takes place during pyrolysis. Select one: True False
Q1.Clearly indicate if each of the following is True or False 1) The amount of bypassed water in split treatment of hardness depends on material balance on Mg². 2) Most water treatment plants in Iraq are using polymers as a coagulant. 3) In drinking water, most of alkalinity comes from SO4². 4) Circle or ring system is the most common method used now to design water distribution systems. 5) Fecal Coliforms and E-Coli are generally pathogenic and we need to test them to avoid their diseases. 6) In flocculation process, we need rapid mixing to enhance formation of flocs for better settlement. 7) In filtration, the only mechanism involved is the straining. 8) It is better to travel downhill, avoid rush hours, and avoid left turn when designing a route for packers. 9) Ozone in Stratosphere layer helps prevent UV light from reaching earth and causing skin problems. 10) Transfer station is used to transfer solid waste to final destination in more efficient way.
Problem 4. A vessel contains 200 Liters of brine with 30 grams of dissolved salt. Brine containing 1 gram of salt per liter enters the vessel at 4 liters per minute. The solution is kept thoroughly mixed and drains from the vessel at the same rate. Calculate the amount of salt in the tank after 5 minutes.