What is liquid waste and classification? How can we manage to prevent a harmful effect? I try to a presentation in my classroom. It is very simple slideshoe.

1. Title: Presentation On Liquid Waste
Name: Abek Chakma
Hi!

2. What is Liquid Waste?
 Liquid waste can be defined as such Liquids as
wastewater, fats, oils or gases (FOG), used oil,
liquids, solids, gases, or sludge's and hazardous
household liquids.
 These liquids that are hazardous or potentially
harmful to human health or the environment.
 Liquid waste is any form of liquid residue that
is hazardous for people or the environment.

3. Some Example of Liquid Waste Source

4. Types of Liquid Waste
 Domestic Sewage
 Industrial Waste Water
 Sullage
 Storm Water
 Sewer
 Strom Sewer.

5. TYPES OF LIQUID WASTE AND POTENTIAL NEGATIVE IMPACTS
Surface Water Pollution:
Liquid waste has the ability to alter water’s
chemical composition.
It can happen slowly – i.e. a slow leak at a
chemicals processing plant or all at once from a
large-scale oil spill.
In turn, drinking water can be contaminated,
and aquatic ecosystems can be disrupted.

6. TYPES OF LIQUID WASTE AND POTENTIAL NEGATIVE IMPACTS
Soil Contamination:
 Liquid waste can quickly seep into the
earth.
 This pollution can cause harm to plants
growing in the soil.
 As well as to animals or people who
consume foods that were created in
contaminated soil.

7. TYPES OF LIQUID WASTE AND POTENTIAL NEGATIVE IMPACTS
Air Pollution:
 Although air pollution is more commonly
associated with dust.
 Gas and fine particle contamination.
 Liquid wastes can also impact air quality.
For example,
Foul smells are common with liquid waste
pollution, particularly with sewage systems.

8. Management of Liquid Waste
 Pit latrines are the most common method of
disposing of human wastes.
 Faecal sludge accumulates in pit latrines and septic
tanks and must be regularly removed and disposed
of safely.
 The aims of wastewater treatment are to reduce the
amount of biodegradable matter and solids in the
effluent, remove toxic materials and eliminate
pathogenic micro-organisms.

9. Management of Liquid Waste
 Storm water can be managed by sustainable
drainage systems.
 Sullage should be discharged to sewers or
septic tanks.
 If these are not available, it should be
discharged into a pit filled with gravel or sand.

10. 3 Ways To Waste Water Treatment
 Primary treatment :
Solids are separated.
 Secondary treatment:
Dissolved biological matter is converted into a
solid mass by using water-borne bacteria. 95% of the
suspended molecules should be removed.
 Tertiary treatment:
Biological solids are neutralized then disposed,
and treated water may be disinfected chemically or
physical.

11. Industrial Effluent Management
 Storm water can be managed by
sustainable drainage systems.

12. Sewage Management
 To stabilize the organic matters so that it can
be disposed off safely and to convert the
sewage water into an effluent of an acceptable
standard of purity which can be disposed of in
to land, rivers or sea.
 A standard test which is an indicator of the
organic content of the sewage is biochemical
oxygen demand(BOD).

13. Sewage Management
 BOD value range from 1mg/liter for natural
water to 300 mg/liter for untreated sewage.
 BOD is defined as the amount of oxygen
absorbed by a sample of sewage during
specified period, generally five days, at a
specific temperature, generally by living
organism

14. Disposal of Effluent
 Use for Irrigation.
 Disposal in river, sea, lakes,
ponds etc.

15. Sludge Digester
 3-4 weeks complete digestion takes
place and it is carried out in sludge
drying bed.
 Digested sludge is used as organic
fertilizer for agricultural purpose

16. Thank You All