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Wastewater treatment

sua o filr nay luon nhe
by

tuan mai kha

on 8 November 2013

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Transcript of Wastewater treatment

Identify specific existing or emerging water pollution problems.
Gather information to design specific pollution prevention or remediation programs
Determine whether compliance with pollution regulations or implementation of effective pollution control actions are being met
Respond to emergencies, such as spills and floods.
- Remove carbonaceous BOD and nitrification
- Need oxygen to microorganisms decompose organic into carbon dioxide, water and other end products
- Performance remove high BOD, reaching 90 percent
- Include : four aerobic system treatment: Activated sludge, aerobic digestion, trickling filters and rotating biological contactor

Aerobic process
Anaerobic process
Water
Polution

The using water in Viet Nam
Situation
- Water demand is huge => Challenges for Vietnam are large.

- Vietnam has two main deltas: Red river and Mekong deltas.

- Vietnam has 3200km of coasts, and the length of each river mouth is about 20km in average => are highly sensitive to water uses and pollution.
Quality of water resources
Vietnam has many rivers are polluted severely
Water Pollution in Vietnam
PURE WATER FOR ALL
What would we do?
The Vedan plants polluting Thi Vai River
(Binh Phuoc province) heavy polluting
Wastewater treatment Solution
Physical
methods
Biological methods
Chemical wastewater treatment method
Biological wastewater treatment methods
Chemical methods
Water purifiers
Sand layer
Activated carbon layer
Removes:
99% of microbial cysts
99% of pharmaceuticals and lead
97% of the chlorine.
Nanotube carbon
Sewer grates
Remove large pieces of trash and debris
-> Ensure safe for wastewater treatment system
Using some chemical reaction or reactions to improve the water quality
Some chemical method: Oxidation reaction, neutralization reaction, Ion exchange reaction,...
Neutralization reaction
Use some chemicals: NaOH, KOH, Ca(OH)2
The cheapest and the most effective is Ca(OH)2
Oxidation reactions
Chlorination 
Ozonation
Use chlorine gas
Compounds chlorine
(Ca(ClO)2,CaOCl2)
Use ozone
Material Piroluzition
Oxidation by hydroperoxide
Use hydroperoxide
Doan Phuong Kieu
Nguyen Van Long
Vu Huu Long
Mai Kha Tuan
Nguyen Thi Le

Presenters:
Use dioxide manganese
Biological wastewater treatment methods
Mechanism

- Use microorganisms, mostly bacteria, in the biochemical decomposition of wastewater
- The products of the decomposition process are CO2, H2O,
N2, sulfide ion ...

Purpose

Removal of organic matter (COD, BOD)

Meaning

- Low cost
- Friendly environment
- Easy to do

3 types: raw, medium and smooth
Remove BOD by anaerobic microorganism
Decompose organic into methane and carbon dioxygen
Performance reach from 80 percent to 85 percent
Include: anaerobic digestion and sludge blanket – upflow anaerobic sludge blanket (UASB)
Made of carbon atoms
10000 times thinner than human hair.

Activated sludge process
drinking water
in agriculture
in electricity production
Trickling Filter
- Remove BOD by anaerobic microorganism
- Decompose organic into methane and carbondioxygen
- Performance reach from 80 percent to 85 percent
- Include: anaerobic digestion and sludge blanket – upflow anaerobic sludge blanket (UASB).

UASB
Water pollution Monitoring
The water-related problems
the flood in Hanoi
the coastal retreat in Camau
Classification
Ceramic
layer
Pebbles layer
To Lich river
Day river
Water
Active Carbon layer
The results were reported
Pollution and depletion of water resources threaten the security of water and food security
Thi Vai River
Cause nr.1
cause nr.3
Reverse osmosis and ultrafiltration
cause nr.4
cause nr.5
Allow water molecules to pass through the interior of the cylinders while chemical and microbial contaminants could not
cause nr.6
Strong ability to adsorb many types of chemical and microbial contaminants
Total Suspended Solids(TSS)?
Thank for your attention!
References
1. U.S. Army Public Health Command (Provisional). Aberdeen Proving Ground, MD 21010-5403. Commercial 410-436-3919 or DSN 584-3919
2. Venkata K.K. Upadhyayula, Shuguang Deng, Martha C. Mitchell, Geoffrey B. Smith: Application of carbon nanotube technology for removal of contaminants in drinking
water
3. Waste definitions: Environment Protection Authority (EPA) licenses, existing publications,
legislation and Australian Standards
4. www.wikimepia.com
5. "Wastewater Treatment Principles" by Karen Mancl. Ohio State University
6. Industrial waste water - Discharge standards: TCVN 5945:2005
7. King Country. Water Quality Index for Stream and River, 2007.
Why do monitoring for water pollution?
Water sampling analysis
Monitoring is conducted for many purposes:
Selecting sampling stations

River


Lakes and reservoirs


Underground
Types of sample
Depth-integrated
Area-integrated
Time-integrated
Discharge-integrated

Sampling surface waters
Sampling surface waters
Chemical & Physical analyses
Estimate and forecast
Microbiologcal analyses
cause nr.2
The polluting agents

1. The organic material: Bottles, cans, nylon bags,...

2. The inorganic material: Trees, plants or animal material.

3. The toxic metals: Arsenic, Chrorium, Radi,...

4. The pathogenic microorganisms: bacteria Ecoli,..

Fertilisers are often used in farming, sometimes these fertilisers run-off into nearby water causing an increase in nutrient levels.
This causes phytoplankton to grow and reproduce more rapidly, resulting in algal blooms.
This bloom of algae disrupts normal ecosystem functioning and causes many problems.
The algae may use up all the oxygen in the water, leaving none for other marine life. This results in the death of many aquatic organisms such as fish, which need the oxygen in the water to live.
The bloom of algae may also block sunlight from photosynthetic marine plants under the water surface.
Some algae even produce toxins that are harmful to higher forms of life. This can cause problems along the food chain and affect any animal that feeds on them.
Dumping of litter in the sea can cause huge problems. Litter items such as 6 pack ring packaging can get caught in marine animals and may result in death. Different items take different lengths of time to degrade in water: cardboard(2ws), newspaper(6ws), photodegradable packaging(6ws), foam(50ws), styrofoam(80ws), aluminium(200ys), plastic packaging or glass (so long)...
Nuclear waste is produced from industrial, medical and scientific processes that use radioactive material. Nuclear waste can have detrimental effects on marine habitats. Nuclear waste comes from a number of sources:

Operations conducted by nuclear power stations produce radioactive waste. Nuclear-fuel reprocessing plants in northern Europe are the biggest sources of man-made nuclear waste in the surrounding
ocean. Radioactive traces from these plants have been found as far away as Greenland.
Mining and refining of uranium and thorium are also causes of marine nuclear waste.
Waste is also produced in the nuclear fuel cycle which is used in many industrial, medical and scientific processes.
of agricultural practices produce
Oil spills make up about 12% of the oil that enters the ocean. The rest come from shipping travel, drains and dumping.
An oil spill from a tanker is a severe problem because there is can be catastrophic to local marine wildlife such as fish, birds and sea otters.
Uses Remote sensing and GIS in water monitoring
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