The document discusses waste management and wastewater treatment. It defines different types of waste such as organic, inorganic, thermal, and radioactive waste. It also outlines the impacts of waste on health, environment, and aquatic life. The main methods of waste management are reduce, reuse, recycle, and refuse. Wastewater treatment involves preliminary treatment like screening and grit removal, primary treatment through sedimentation, and secondary treatment using trickling filters, activated sludge, sludge handling, and disinfection. The overall goal of waste and wastewater management is to minimize environmental impacts and utilize resources.

1. Management of waste &
waste water
Md. Husain Bin Siddiqui
ID. UG08-20-12-002
State University Of Bangladesh
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2. Waste
Any material that is discarded ,useless
or unwanted is considered as a waste
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3. Sources of Wastes
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4. Sources of Wastes
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5. Types of Waste
1. Organic
2. Inorganic
3. Heated (Thermal)
4. Radioactive
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6. Organic Waste
This is a type of waste that may come from
animals or plants. Natural organic wastes
can be consumed by bacteria & other small
organisms. Organic Waste is the most
common waste in cities and towns.
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7. Inorganic Waste
Inorganic waste is waste material such as
sand, salt, iron, calcium, and other mineral
materials. These wastes are chemical
substances of mineral and metal origins.
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8. Heated (Thermal) Waste
Heated waste comes from wastewater with
the temperature exceeding certain
requirements. This type of waste comes
from cooling processes used by industrial or
thermal power stations.
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9. Radioactive Waste
This type of waste is usually controlled at
the source it's coming from. Radioactive
waste most commonly comes from research
labs, hospitals, or nuclear plants.
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10. Impacts of waste on health
Chemical poisoning through chemical inhalation
Uncollected waste can obstruct the storm water
runoff resulting in flood
 Low birth weight
 Cancer
 Congenital malformations
 Neurological disease
 Nausea and vomiting
 Increase in hospitalization of diabetic residents living near hazard
waste sites.
 Mercury toxicity from eating fish with high levels of mercury.
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11. Impacts of waste on animals
and aquatics life
 Increase in mercury level in fish due to disposal
of mercury in the rivers.
 Plastic found in oceans ingested by birds.
 Resulted in high alga population in rivers and
sea.
 Degrades water and soil quality.
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12. Impacts of waste on
Environment
 Waste breaks down in landfills to form methane,
a potent greenhouse gas
 Change in climate and destruction of ozone layer
due to waste biodegradable
 Littering, due to waste pollutions, illegal dumping,
Leaching: is a process by which solid waste enter
soil and ground water and contaminating them.
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13. Waste Management
Waste management is the collection,
transport , processing, recycling or
disposal and monitoring of waste materials
l
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14. Waste Management
Four concept
Reduce
Reuse
Recycle
Refuse
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15. Refuse
Use containers that are already at home
Refuse to buy the new item when they are
not required
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16. Reuse
If you cannot prevent waste then reuse
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17. Recycle
Use shopping bags made of cloth which
can be use over and over again
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18. Reduce
Reduce generation of unnecessary waste
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19. The main purpose of waste management is
to minimize the adverse effects on the
environment, by
Collection wastes
Disposal wastes
Utilization wastes
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20. Collection of waste
Gathering the waste
Transporting to centralized location
Disposal of waste
Compaction
Incineration
Manual separation
Utilization of waste
Conservation of natural resources
Economic development
Generate many useful product
Employment opportunities
Control of air pollution
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21. Wastewater Management
Reuse
Recycle
Discharge and Treat
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22. Reuse
Some relatively clean wastewater can be reused
without treatment. Graywater is wastewater generated
by washing, laundry, and bathing (not from toilets)
Recycle
Wastewater can be treated (on-site or off-site) and
reused for nondrinking purposes Closed-loop treatment
systems are often used to capture, treat, and reuse
wastewater on-site. Wastewater reclamation involves
treating the wastewater and using it for a different
purpose.
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23. The Treatment Process
Preliminary Treatment
The preliminary treatment process has four
different processes to ensure that coarse material
is separated from the wastewater.
l. Screening
2. Shredding
3. Grit removal
4. Flow meterUse
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24. Screening
A screen is used to collect debris, such as wood,
rags, and other objects from going through the
treatment process.
 Constructed with parallel bars placed at an angle in
a channel.
Shredding
Devices called barminutor and comminutor are
placed after a bar screen to cut or shred any of the
leftover material that passed through the screen.
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25. Grit Channels
A grit channel is a long, narrow trough that's
designed at a slight angle to provide a flow-through
velocity of one foot per second for wastewater to
flow through.
Flow Measuring Devices
A meter, designed in many different ways to show
how much wastewater is flowing into a wastewater
treatment facility.
They are most commonly found in the headwords,
or treatment plant.
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26. Primary Treatment
The primary treatment process is made up of only one
process : Sedimentation
Sedimentation
The waste goes into and through a large tank or basin.
The flow velocity is about 0.03 feet per second. The
wastewater will flow through a clarifier to provide about 2
hours of detention time.
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27. Secondary Treatment
After the primary treatment wastewater leaves the
clarifier, and goes through the secondary treatment. The
secondary treatment is the final process to ensure the
operator that the facility treated as much as waste as
possible.
There are four different processes to make up the last of
the processes.
1. Trickling Filters
2. Activated Sludge
3. Sludge Handling
4. DisinfectionUse
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28. Trickling Filters
Using a bed of 1/2 - 5 inch rock or blocks which settles
wastewater from the primary clarifier. The wastewater is
usually applied by an overhead rotating distributor, and
trickles over and around the media.
Activated Sludge
An aeration tank is used for this process. It serves the
same purpose as a trickling filter. Wastewater is piped to
a large aeration tank, where oxygen is supplied into the
bottom of the tank, or by churning the surface
mechanically.
This leads to the secondary clarifier.
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29. Sludge Handling
The solids that are left are removed from the treatment
process are commonly broken down by biological treatment
process called sludge digestion.
Disinfection
The wastewater will go through the last faze, disinfection
to kill pathogenic organisms. Disinfection in wastewater is
most commonly accomplished by applying chlorine
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