Please solve all points Clearly indicate if each of the following is true or false?1.1 Proper F/M ratio in a conventional activated sludge process is 0.2 to 0.5.1.2 In wastewater treatment plants, all suspended solids can be removed in a grit chamber.1.3 Some advantages in screw pumps are to provide good aeration and no clog.1.4 The main focus in wastewater secondary treatment is to remove TSS.1.5 Streeter Philips model may estimate environmental damages and DO level due to single or multiplepollution discharging points to a river,1.6 Critical point is the point where maximum deficit in dissolved oxygen occurs.1.7 Sequencing batch reactor requires two tanks, one for aeration and another for settling.1.8 No need for returning sludge to the aeration tank in the Activated Sludge Method1.9 Filamentous bacteria is an organisms that grow in thread or filamentous form and prevent settling of sludgein the secondary clarifier1.10 Spring/fall turnover may cause the death of algae in a lake.

1.1 Proper F/M (Food to Microorganism) ratio in a conventional activated sludge process typically…

Answered: Clearly indicate if each of the…

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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sludge process that could works without primary sedimentation tank is: A- Extended aeration B- Conventional C-High rate aeration D- Step feed aeration **Good Luck**
MPN of effluent is 10/100 ml and it reduces to 102/100 ml after chlorination. Find percentage removal (%R) and log removal (logR) of MPN.
You have designed a treatment system for contaminant Z. The treatment system consists of two parts: (1) a pipe with a volume of 15 m3 and (2) a CSTR has a volume of 60 m3. The pipe feeds into the CSTR. The inflow to the pipe is 10 m3/d and the influent Z concentration at the start of the pipe is 2,500 mg/L. The effluent from the pipe has a Z concentration of 1500 mg/L. Assume the reaction is first order. What is the reaction rate constant in units of (1/day)?
A typical biological process in treating waste water using aerated lagoon can be described by one of the following schematic diagrams Cl, E (A)--BR AL Cl, ST CH BR AL E_ (B) ST Cl, (C) -BR AL ST (D)--BR CH AL ST
Q2: Determine the resultant about the point O of the four forces and one couple which act on the plate shown in the Figure below. Note : for the resutant of 3osihys Forc es, You should computy the magnitude Kdirechion 30N 5 m- 3 ocos4s 25N 2 m 70 N-m 20N 40N o 30
1. Screening and comminution are preliminary treatment processes True b) False devices remove materials which would damage equioment or interfere with a process a) Grit O Screening c) Oxidation d) Reduction represents the heavier inert matter in wastewater aj Debris b) Waste c) Screens Grit is a process which involves further removal of the nitrogen al Nitrification O Denitrification C) Ammonification d) Reduction 5. Turbidity in water is caused by which of these following? a) Total dissolved solids O Suspended solids c) lons d) Heavy metals O True b) False
Waste activated sludge can be described as a Newtonian fluid with a kinematic viscosity of 20 x 10 ft/sec. At the same temperature, the kinematic viscosity v of water is 10 ft/sec. The relative roughness of the piping system is 0.001. The pressure drop for flow of water at a Reynolds number of 10' in this piping system was determined to be 1.0 psi. If waste activated sludge flows at the same velocity through the piping" system, the pressure drop (psi) is most nearly:
A sample of wet aggregate 297.2 N. After drying in an oven, this sample weighed 281.5. The absorption of this aggregates is 2.5%. Calculate the percent of free water in the original wet sample. Weight of the wet aggregates (Wwet) = 297.2 N Weight of the dry aggregates (Wdry) = 281.5 N
In a laboratory we are doing a series of tests on a sample of aggregate. This sample has the wet weight of 586.3 gr and dry weight of 513.9 gr. If the absorption of this aggregate is measured as 2.23%. Calculate the percent of free water in the original wet sample.
I) Two aggregates (Al and A2) were obtained from the field. A sieve analysis was performed on each sample, and the samples (originally 500g in mass) were brought to the oven dry condition (OD) and weighed. Data was obtained for each of the aggregates and is presented in the tables below. (Density of water-1g/cm) Table 1. Results from sieve analysis. Sieve Size Opening (mm) Weight of Aggregate retained (g) A1 A2 3/8" 9.5 No. 4 4.75 65 No. 8 2.36 60 25 No. 16 1.18 100 396 No. 30 0.6 50 No. 50 0.3 118.5 10 No. 100 0.15 75 15 Pan 75 Table 2. Absorption capacity and moisture content data. Al A2 500 g 500 g Field Weight Oven Dry Weight Absorption Capacity (%) 0.7 % 498.5 g 496 g 0.6 % a) Plot the grading curve for each aggregate (x-axis: sieve opening, y-axis: %passing). (Note: In the grading curves, you must show all data points. You can draw the gradation chart using excel or by hand. If you draw by hand, you have to use a ruler. The format of the gradation chart should be same as in the…
A BOD test is run using 100mL of treated wastewater. The initial DO of the mixture after diluting the waste sample with distilled water is 9.0mg/L. After 5-day incubation, the DO measured was 4.0mg/L. After a long period of time, the DO is 2.0mg/L and no longer seems to be decreasing. Assume that nitrification has been inhibited. Determine the following: a)BOD5 & BODu of the waste sample b) BOD5 of the mixture and c) k THANK YOU
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