Question

environmental engineering wastewater treatment. waste water
treatment.

1- In a 2 steps cascade aeration, each step increases oxygen
concentration from 10 % to 30 % of saturation level. If the initial
oxygen concentration is 20 % of saturation level and minimum oxygen
is required to be 5 mg/L at the end of aeration, is the system
efficient or not? Show your calculations. Inlet water temperature
is 15 C (Cs = 10.2 mg/L)

2- Design flocculation tanks (2 tanks, 5 compartments for
each) for the flow rate of 600 m3/hour.

-Select & control G&T values.

-Calculate dimensions (width-length-depth)

water treament.

water treatment

Answer #1

1.sincequestion number was not mentioned i solved 1st question

minimum oxygen concentration after end of aeration is 4.08mg/L<5mg/L

Not efficient

Envriromental Engineering ( wastewater treatment )
A high-rate aeration system produces 1140 m3/d of waste sludge.
The sludge is wasted directly from the aerator and has a solids
content of 3300 mg/L. This sludge is thickened by a dissolved air
flotation unit to 3.0 percent solids. Determine the volume of the
thickened sludge.

A 2,250 m3/day extended aeration system is used to treat sewage
from Taman Maju Jaya.
The average BOD influent of the sewage treatment plant is 250 mg/L
and is reduced by
65% after the primary clarifier. It has two rectangular aeration
tanks (working in parallel)
with a dimension of 4 m width, 6 m length and 3.5 m water depth.
The aeration tank
maintains a biomass concentration of about 4000 mg/L.
(i) Determine the food-to-microorganism ratio of the aeration
tank...

You are tasked with conducting BOD studies for a waste treatment
facility and its discharge to a nearby river. You are told that the
facility removes 93% of the BOD in total with a discharge rate of
1.0 m3 /s. you sample the receiving water and find that it has a
0.5 mg/L deficit from saturation concentration (saturation is at
9.7 mg/L) and a BOD5 content of 10 mg/L. The river flows at a speed
of 0.25 m/s and has...

You are tasked with conducting BOD studies for a waste treatment
facility and its discharge to a nearby river. You are told that the
facility removes 93% of the BOD in total with a discharge rate of
1.0 m3 /s. you sample the receiving water and find that it has a
0.5 mg/L deficit from saturation concentration (saturation is at
9.7 mg/L) and a BOD5 content of 10 mg/L. The river flows at a speed
of 0.25 m/s and has...

Environmental Engineering
biological processes,
A wastewater with a COD concentration of 970 mg / L 8,000 m3 /
day flow, fully mixed back It will be treated in a cyclic activated
sludge system.Treatment system mud age will be 5 days will be
designed in a way. Kinetic and stoichiometric coefficients were
determined as follows.
Volumetric organic loading speed: 0,5 kg COD/m3.day
uH : 3,7 day-1,
bH: 0,04 day-1,
KS: 45 mg
COD/L, YH: 0,5 g VSS/g COD
VSS/TSS: 0,8 mg...

The town of Camp Verde has been directed to upgrade its primary
Waste Water Treatment Plant (WWTP) to a secondary plant that can
meet an effluent standard of 25 mg/L BOD5 and 30 mg/L suspended
solids. They have selected a completely mixed activated sludge
system for the upgrade. The existing primary treatment plant has a
flow rate of 0.029 m3/s. The effluent from the primary tank has a
BOD5 of 240 mg/L. Using the following assumptions, estimate the
required volume...

A rectangular, well-mixed aeration lagoon is 75 m long, 5 m
wide, and 2 m deep. It receives 400 m3/d of wastewater
with a BOD5of 367mg BOD5/L for treatment. The
biodegradation rate constants for the wastewater are the following:
yield coefficient = 0.8 mg VSS/mg BOD5, endogenous decay
constant = 0.08 d-1, maximum specific microbial growth
rate = 1 d-1, and half velocity constant = 76.0 mg
BOD5/L.
What must the hydraulic detention time be in the aeration pond?
(days)...

ANSWER as much as possible:
Design an activated sludge process consisting of a complete mix
flow through aeration tank followed by final settling tanks. The
sizing of the reactor and all appurtenances should be based on a
solids retention time, (SRT), of 4 days and the particulates given
below.
Biological characteristics: Ks = 20
mg/L COD, kd = 0.1 per day, mumax = 3
gVSS/gVSS-day,
Y = 0.4 gVSS/gCOD
Primary settling Tank Effluent
Characteristics:
Q= 20MGD, biodegradable COD, bCOD...

Problem #3: Biochemical Oxygen Demand (BOD) and Stream
Quality
A wastewater
treatment plant designed for a community of 45,000 people has a
flow of 100 gal/person/day and a BOD5 loading of 0.2
lb/person/day. The upstream characteristics of the receiving waters
are:
stream flow rate =
20 cfs and BOD5 = 2 mg/L
The water quality
standards require the in-stream BOD5 to be less than 7
mg/L in this stretch of the river.
The minimum BOD
removal efficiency that the treatment...

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