The document discusses aeration in water treatment. Aeration serves several purposes including increasing dissolved oxygen, removing gases like hydrogen sulfide and methane, and oxidizing iron and manganese from soluble to insoluble states. Common aerators used are gravity aerators, fountain aerators, injection aerators, and mechanical aerators. Gravity aerators expose water to atmosphere using cascades or multi-tray designs. Injection aerators introduce fine air bubbles using perforated pipes or diffusers. Aeration converts iron and manganese into insoluble forms that precipitate out for removal.
Here you will get all information about sewer design, its type & various tests carried out on it for any leakage or any obstruction present and of improper joints.
Lecture notes of Environmental Engineering-II as per Solapur university syllabus of TE CIVIL.
Prepared by
Prof S S Jahagirdar,
Associate Professor,
N K Orchid college of Engg and Technology,
Solapur
Hardy cross method of pipe network analysissidrarashiddar
Hardy Cross Method of pipe network analysis has revolutionized the municipal water supply design. i.e., EPANET, a public domain software of water supply, uses the Hardy cross method for pipe network analysis. It is an iterative approach to estimate the flows within the pipe network where inflows (supply) and outflows (demand) with pipe characteristics are known.
Here you will get all information about sewer design, its type & various tests carried out on it for any leakage or any obstruction present and of improper joints.
Lecture notes of Environmental Engineering-II as per Solapur university syllabus of TE CIVIL.
Prepared by
Prof S S Jahagirdar,
Associate Professor,
N K Orchid college of Engg and Technology,
Solapur
Hardy cross method of pipe network analysissidrarashiddar
Hardy Cross Method of pipe network analysis has revolutionized the municipal water supply design. i.e., EPANET, a public domain software of water supply, uses the Hardy cross method for pipe network analysis. It is an iterative approach to estimate the flows within the pipe network where inflows (supply) and outflows (demand) with pipe characteristics are known.
Sedimentation is an effective techniques involved for treatment of waste water . Various sedimentation techniques are employed world wide for the purpose.
Plain sedimentation is the simplest technique involving quiescent settling or storage of water, such as would take place in a reservoir, lake, or basin, without the aid of chemicals, preferably for a month or longer, particularly if the source water is a sewage-polluted river water.
This presentation covers various plain sedimentation tanks & design considerations of the same .
If you like it ,Please press the thumb up button & donot forget to give your feedback in comments section, it would be extremely valuable . Any query ? Feel free to post in comments section. All the best ! Enjoy !
Industrial wastewater treatment describes the processes used for treating wastewater that is produced by industries as an undesirable by-product. After treatment, the treated industrial wastewater (or effluent) may be reused or released to a sanitary sewer or to a surface water in the environment. Some industrial facilities generate wastewater that can be treated in sewage treatment plants. Most industrial processes, such as petroleum refineries, chemical and petrochemical plants have their own specialized facilities to treat their wastewaters so that the pollutant concentrations in the treated wastewater comply with the regulations regarding disposal of wastewaters into sewers or into rivers, lakes or oceans.
Lecture notes of Environmental Engineering-II as per Solapur university syllabus of TE CIVIL.
Prepared by
Prof S S Jahagirdar,
Associate Professor,
N K Orchid college of Engg and Technology,
Solapur
Sedimentation is an effective techniques involved for treatment of waste water . Various sedimentation techniques are employed world wide for the purpose.
Plain sedimentation is the simplest technique involving quiescent settling or storage of water, such as would take place in a reservoir, lake, or basin, without the aid of chemicals, preferably for a month or longer, particularly if the source water is a sewage-polluted river water.
This presentation covers various plain sedimentation tanks & design considerations of the same .
If you like it ,Please press the thumb up button & donot forget to give your feedback in comments section, it would be extremely valuable . Any query ? Feel free to post in comments section. All the best ! Enjoy !
Industrial wastewater treatment describes the processes used for treating wastewater that is produced by industries as an undesirable by-product. After treatment, the treated industrial wastewater (or effluent) may be reused or released to a sanitary sewer or to a surface water in the environment. Some industrial facilities generate wastewater that can be treated in sewage treatment plants. Most industrial processes, such as petroleum refineries, chemical and petrochemical plants have their own specialized facilities to treat their wastewaters so that the pollutant concentrations in the treated wastewater comply with the regulations regarding disposal of wastewaters into sewers or into rivers, lakes or oceans.
Lecture notes of Environmental Engineering-II as per Solapur university syllabus of TE CIVIL.
Prepared by
Prof S S Jahagirdar,
Associate Professor,
N K Orchid college of Engg and Technology,
Solapur
L12 -SECONDARY TREATMENT OF SEWAGE ACTIVATED SLUDGE PLANT.pptxPRACHI DESSAI
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The aqua silencer system is design for replace commonly used single unit silencers in engine with it’s slender structure and less weight. It plays an important role in control the noise and emission of gases from engines. Air pollution causes dangerous physical effect on the human body, animal and environment. The main reason to use aqua silencer is because nowadays air pollution is increasing rapidly. This system reduces the dangerous exhaust gases from the auto.
These emissions are controlled by the activated charcoal layer around perforated tube and lime water. The charcoal layer having high capacity to absorb emission gases from engine. This type charcoal layer with lime water reacts chemically with emission gases and change the chemical structure of emission gases. The smoke or emission gases and noise level in aqua silencer is very less than the commonly used silencers.
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Raw water coming from different sources contains dissolved salts and un-dissolved or suspended impurities. It is necessary to remove harmful salts dissolved into the water before feeding it to the boiler.
Spray Angle Expansion Method of a Twin-Fluid Atomizer for the Application to ...IJRES Journal
This paper presents the results of an experimental study for a new type twin-fluid atomizer, which is based on a multi fluids mixer patented by Sadatomi & Kawahara (2012). This atomizer has a simple structure and can suck water by itself without a pump by introducing pressurized air alone into an internal mixing chamber with less energy consumption. The present study focuses on the improved design of the atomizer for spray angle expansion and its application to CO2 absorption. Experiments relating to two angle expansion methods (Coanda effect and propellers) were conducted, also six sizes of PET (Polyethylene Terephthalate) propellers were tested. We found that, the atomizer with a PET propeller of 4 blades and 25 mm in diameter showed the best spray angle expansion effect and presented a good spray quality, especially reduced the Sauter mean diameter (d32) significantly. Finally, the mist sprayed by the optimized atomizer was applied to CO2 absorption, and experimental results showed that the mist sprayed by the optimized atomizer can significantly decrease the CO2 concentration in a closed room.
05 Treatment of water - Aeration and Sedimentation (C+F)akashpadole
The presentation has prepared as per the syllabus of Mumbai University.
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Aerated lagoons are a type of wastewater treatment system that uses artificial aeration to promote the biological oxidation of wastewaters. They are relatively simple and inexpensive to construct and operate, and they can be effective in removing a wide range of pollutants from wastewater, including organic matter, nutrients, and pathogens.
Not only fish but also all animals, must obtain oxygen from the environment for respiration. Oxygen is far less available to aquatic organisms than it is to air-breathers, and the dissolved oxygen content of water may limit the activities of fish. In most natural waters, the supply of oxygen to water (diffusion from the atmosphere and production from underwater photosynthesis) exceeds the amount used in oxygen-consuming processes, and fish seldom have problems obtaining enough oxygen to meet normal metabolic demands.
In aquaculture ponds, however, the biomass of plants, animals and microbes is much greater than in natural waters, so oxygen is sometimes consumed faster than it is replenished. Depending on how low the dissolved oxygen concentration is and how long it remains low, fish may consume less feed, grow more slowly, convert feed less efficiently, be more susceptible to infectious diseases, or suffocate and die. Aqua culturists avoid these problems by aerating ponds mechanically to supplement normal oxygen supplies.
Unit processes* designed to
remove _________________________
remove __________ ___________
inactivate ____________
*Unit process: a process that is used in similar ways in many different applications
Unit Processes Designed to Remove Particulate Matter
Screening
Coagulation/flocculation
Sedimentation
Filtration
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In today’s fast-changing business environment, it’s extremely important to be able to respond to client needs in the most effective and timely manner. If your customers wish to see your business online and have instant access to your products or services.
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NUMERICAL SIMULATIONS OF HEAT AND MASS TRANSFER IN CONDENSING HEAT EXCHANGERS...ssuser7dcef0
Power plants release a large amount of water vapor into the
atmosphere through the stack. The flue gas can be a potential
source for obtaining much needed cooling water for a power
plant. If a power plant could recover and reuse a portion of this
moisture, it could reduce its total cooling water intake
requirement. One of the most practical way to recover water
from flue gas is to use a condensing heat exchanger. The power
plant could also recover latent heat due to condensation as well
as sensible heat due to lowering the flue gas exit temperature.
Additionally, harmful acids released from the stack can be
reduced in a condensing heat exchanger by acid condensation. reduced in a condensing heat exchanger by acid condensation.
Condensation of vapors in flue gas is a complicated
phenomenon since heat and mass transfer of water vapor and
various acids simultaneously occur in the presence of noncondensable
gases such as nitrogen and oxygen. Design of a
condenser depends on the knowledge and understanding of the
heat and mass transfer processes. A computer program for
numerical simulations of water (H2O) and sulfuric acid (H2SO4)
condensation in a flue gas condensing heat exchanger was
developed using MATLAB. Governing equations based on
mass and energy balances for the system were derived to
predict variables such as flue gas exit temperature, cooling
water outlet temperature, mole fraction and condensation rates
of water and sulfuric acid vapors. The equations were solved
using an iterative solution technique with calculations of heat
and mass transfer coefficients and physical properties.
2. 2.1 Purpose of Aeration in water Treatment
Aeration is used for many purposes in water Treatment theAeration is used for many purposes in water Treatment , the
main uses are:
1. Increase the dissolved oxygen concentration in water.1. Increase the dissolved oxygen concentration in water.
2. Decrease CO2 concentration thereby reduce its
corrosiveness.corrosiveness.
3. Reduce taste and odor caused by dissolved gases such as
Hydrogen sulphide (H2S) and methane (CH4) that areHydrogen sulphide (H2S) and methane (CH4) that are
removed during aeration.
4. Oxidize iron and manganese from their soluble to4. Oxidize iron and manganese from their soluble to
insoluble states and cause them to precipitate so that they
maybe removed by sedimentation and filtration processes.
2
5. Remove certain volatile organic compounds.
3. 2.2 Types of aerators used in water Treatment
The most common aerators used in water treatment are :The most common aerators used in water treatment are :
1. Gravity Aerators: In gravity aerators, water is allowed to fall
by gravity such that a large area of water is exposed toby gravity such that a large area of water is exposed to
atmosphere, sometimes aided by turbulence. Cascade
aerators and Multi‐tray aerators are two examples of this
type.
2. Fountain Aerators : These are also known as spray aerators
with special nozzles to produce a fine spray.
3. Injection or Diffused Aerators : It consists of a tank with
perforated pipes, tubes or diffuser plates, fixed at the
b tt t l fi i b bbl f itbottom to release fine air bubbles from compressor unit.
4. Mechanical Aerators : Mixing paddles as in flocculation are
d P ddl b ith b d t th f
3
used. Paddles may be either submerged or at the surface.
21. Cascade AeratorCascade Aerator
Cw,e = gas concentration in the effluent water, mg/L
Cw,0 = gas concentration in the influent water, mg/L
21
,
Cs = gas saturation concentration in water at specific temperature , mg/L
h = height of one step, m
23. Cascade AeratorCascade Aerator
3
10*
*)( ggas
a
V
CMW
C
Ca = gas concentration in air, mg/L
(MW)gas = molecular weight of gas, gram
C i i i
10*airV
Cg = gas concentration in air, ppm
Vair = volume of 1 mole of air at a given pressure and temperature, L
nRT
P
nRT
Vair
n = number of air moles, ( in this case n =1)
R = universal gas constant, 0.08285 (atm.L)/(mole.K)
T = temperature in degrees Kelven.
P = air pressure , atm
Typical values of Cg :
CH4 = 1.5‐2.00 ppp
H2S = 20‐30 ppm
23
CO2 = 350‐450 ppm
25. Cascade AeratorCascade Aerator
Example:
C d i b d h f d h d hCascade is to be used to remove methane from ground water. The cascade has
5 steps each 0.40 m. The initial concentration of methane in the ground water is
0.80 mg/L and its saturation concentration (CS ) in water under atmospheric pressure
i i l t 0 /Lis is close to 0 mg/L.
‐What is the efficiency of methane removal after the 5 steps?
‐What is the effluent methane concentration?
l iSolution:
From the table in a previous slide: kCH4 = 27 %
K = 1‐ (1‐k)n = 1‐ (1‐ 0.27)5 = 0.793
,0,, wew
CC
CC
K
80000
80.0
793.0 ,
ewC
Cw,e = (CCH4) effluent = 0.166 mg CH4/L.
0,ws CC 80.00.0
25
26. Cascade AeratorCascade Aerator
Example:
h i h l h f h C d i h i l if i iWhat is the length of the Cascade aerator in the previous example if its capacity
is 35 m3/h per 1 m length of the step. The total water flow to be treated is 625 m3/h.
What is the total surface area of the cascade if the width to height ratio of the steps
i 1 1?is 1:1?
Solution:
L cascade = 625/35 = 17.86 m
Acascade = (number of steps ‐1)*step width*Lcascade
= (5‐1)*0 40*17 86 = 28 58 m2 (5 1) 0.40 17.86 28.58 m
26
27. Multiple tray aerator
This is an economical solution that occupies little space.
It consists of three to eight trays with perforated bottoms. The
p y
holes are 5 to 13 mm in diameter and spaced at 75 mm center to
center.
The trays are placed one on top of another with a 30‐50cm space e ays a e p aced o e o op o a o e a 30 50c space
between them.
The water is evenly distributed in the first tray through porous
pipes or by stopping the gush with a bar (as shown in the figure) sopipes, or by stopping the gush with a bar (as shown in the figure), so
that the water trickles into the tray at a rate of 40‐200 L/min per
square meter of the tray’s surface.
Small droplets are then sprayed into the next traySmall droplets are then sprayed into the next tray.
To obtain a finer spray, the aerator trays can be filled with thick
gravel approximately 10cm deep (50‐150 mm) in diameter.
27
28. Multiple tray aeratorp y
The removal of carbon dioxide by multiple tray aerators is represented by
h f ll ( )the following equation ( AWWA,1990):
kn
e
C
e
C 0
C = effluent concentration, mg/l
C0 = influent concentration, mg/l
k removal rate constant from 0 28 to 0 37 for COk = removal rate constant, from 0.28 to 0.37 for CO2.
n = number of trays
28
29. Multiple tray aeratorp y
Example:
A ground water containing 8 mg/L of CO2 is to be degasified using multiple trayA ground water containing 8 mg/L of CO2 is to be degasified using multiple tray
aerator with three steps. The groundwater flow rate is 990 L/min. The k value
is 0.33 and the hydraulic loading rate of the trays is 400 L/(min.m2)
1 What is the CO concentration in the treated effluent?1. What is the CO2 concentration in the treated effluent?
2. What is the size of the trays if the length to width ratio is 2:1?
Solution:
1. C = C0 * e –kn = C0 * e –0.33X3 = 8*0.3716 = 2.98 mg CO2/L
2. Area of each tray = (990 L/min)/[(400L/(min.m2)] = 2.47 m22. Area of each tray = (990 L/min)/[(400L/(min.m )] = 2.47 m
Dimensions of the tray : L = 2 W
L* W = 2.47 m2
2W*W = 2.47 m2
W = 1.57 m
L = 3 14 m
29
L = 3.14 m
30. Removal of Iron and Manganese from water by Aeration:Removal of Iron and Manganese from water by Aeration:
Iron and manganese in excess of 0.30 mg/L and 0.05 mg/L , respectively ,should be
removed according to secondary standards of EPA. They cause staining of laundry and
plumbing fixtures, produce unacceptable taste and color.
Aeration provides the dissolved oxygen needed to convert the iron and manganese
from their ferrous and manganous forms to their insoluble oxidized ferric and manganic
forms. The produced precipitates of ferric hydroxide and manganic oxide are then
d b di t ti f ll d b id d filt tiremoved by sedimentation followed by rapid sand filtration.
It takes 0.14 mg/L of O2 to oxidize 1 mg/L of iron; and 0.29 mg/L of O2 to oxidize 1 mg/L
of manganeseof manganese.
Oxidation reaction of iron is:
4 Fe(HCO3)2 + 2H2O + O2 > 4 Fe(OH) 3 ↓ + 8CO23 2 2 2 3 2
Oxidation reaction of iron is:
2MnSO4 + 2H2O + O2 > 2MnO2 ↓ + 2H2SO4
30
2Mn(HCO3)2 + O2 > 2MnO2 ↓ + 2H2O + 4CO2