A wastewater sample was diluted 10% with tap water for conducting BOD Test. The DO content in wastewater sample was 1.2 mg/l and water was 6 mg/l. After 5 days incubation at 20°C, the DO of the sample was 0.5 mg/l. Calculate (i) 5 day BOD of wastewater and (ii) ultimate BOD. Assume K₂0 = 0.12/day. ion.

A wastewater sample was diluted 10% with tap water for conducting BOD Test. The DO content in wastewater sample was 1.2 mg/l and water was 6 mg/l. After 5 days incubation at 20°C, the DO of the sample was 0.5 mg/l. Calculate (i) 5 day BOD of wastewater and (ii) ultimate BOD. Assume K₂0 = 0.12/day. ion.

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

A water sample was incubated at 20 °C for 3 days and its BOD3 concentration was found to be 150 mg/L. Given k20°c = 0.20/day (base e) and temperature coefficient for the rate constant is equal to 1.05. (a) BODultimate of this water sample=..............….mg/L (b) The BODs of this sample at 20 °C (in mg/L) =...……...... (c) kıs°c (in day-¹) mg/L.............. (d) The BODs of this sample at 15 °C (in mg/L) =...............
If the filtration equation for a suspension of solids at a constant pressure of 38.7 psia is: t/V=(6.1*10^-5)*V+.01, where t is in seconds and V is in liters for P in psia. If the filtration is run at a constant rate of 10 L/s, how many minutes will it take to reach 50 psia?
In a constant head permeability test a sample 10 cm long was tested in a permeameter with an inside diameter of 6 cm. Under a head of 60 cm, a discharge of 140 cu.cm. was collected in 40 seconds. Compute the coefficient of permeability.
3. The dissolved solids content is determined by filtering a portion of the sample through a glass fiber filter disc into a porcelain evaporating dish, drying the sample at 100°C, and igniting the residue by placing the dried sample in a muffle furnace at 550°C. The following masses are recorded: *Volume of sample: 25 mL •Mass of empty dish: 51.494 g a) The total dissolved solids content is: •Mass of dish and dried solids: 51.524g •Mass of dish and ignited solids: 51.5069 g b) The volatile dissolved solids content is: Does the total solids content equal the sum of the suspended and dissolved solids? c) The fixed dissolved solids content is:
Q5/ In a test to determine the bulk modulus of a liquid it was found that as the absolute pres- sure was changed from 15 to 3000 psi the volume decreased from 10.240 to 10.138 in.³ Determine the bulk modulus for this liquid.
C. What is the concentration UI SUINUS 5. Determine the size (diameter and depth) of the secondary clarifier (s) at a municipal activated sludge treatment facility: The wastewater flow is 25,000 m³/d, the recycle ratio (recycle sludge flow/wastewater flow) is 0.25. The suspended solids concentration is assumed to be 2500 mg/L in the activated sludge tank. The over flow rate is 50 m3/d- m2 and solids loading is 125 kg/d-m2. Estimate detention time if the depth is 4.5 m. What would be the weir loading? Department of Civil & Environmental Engineering P.O. Box 519 Mail Stop 2510, Prairie View, Texas 77446 w.pvamu.edu Phone (936) 261-1660/1665(dept) Fax (936) 261 1662 Ensuring o Using Zoom o
A synthetic sample of water is prepared by adding 100 mg Kaolinite (a clay mineral), 200 mg glucose, 168 mg NaCl, 120 mg MgSO4, and 111 mg CaCl₂ to 1 liter of pure water. The concentrations of total solids (TS) and fixed dissolved solids (FDS) respectively in the solution in rug/L are equal to A 699 and 599 B с D 599 and 399 699 and 199 699 and 399
1. The following information is provided for an activated sludge system design: Parameter Symbol Value Units Flow rate Q 10000 m³/d Influent BOD So 150 mg/L Effluent BOD S 2 mg/L Hydraulic residence time Ꮎ 4 hr Mean cell residence time Oc 6 d Maximum specific growth rate μm 3 1/d Half saturation constant Ks 40 mg/L Yield coefficient Y 0.5 Endogenous decay coefficient b 0.08 1/d Death rate coefficient γ 0.04 1/d Determine: a) The aeration tank biomass concentration (X) in mg/L b) The aeration tank oxygen requirement in kg/d c) The rate of biomass wasting in kg/d
Note: If you don't know the solution please leave it but don't give me wrong solution. Thank you
From water sample, 25 mg/L HCO3" as CacO3, 10 mg/L C032 as Caco3 and 50 mg/L Ca* as CaCO3 were measured. pH was near neutral. What is alkalinity? () mg/L as Cac03 (*Answer in whole number only)
Question 8A 200 g/l solution of common salt was discharged into a stream at a constant rate of 25l/s. The background concentration of the salt in the stream water was found to be 10 ppm. At a downstream section where the solution was believed to have been completely mixed, the salt concentration was found to reach an equilibrium value of 45 ppm. Estimate the discharge in the stream.