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Wastewater Treatment

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on 10 December 2014

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Transcript of Wastewater Treatment

Tertiary
Any water that has been degraded in quality by anthropogenic sources...
What's the problem?
Inadequately treated wastewater can cause adverse health effects on humans, the economy, and the environment

Secondary
Treatment of Wastewater
Divided into:
Primary
Secondary
Tertiary

Primary Treatment
Wastewater Treatment
Emerging contaminants
Combined Sewer Overflow
Case Study: Detroit
Solutions
Jeopardy!
What is
wastewater?
Residential
Agricultural
Industrial
Agricultural
Industrial
Residential
According to the World Health Organization, there are 2.4 billion people without access to a sanitary waste disposal system (2001)
Developing Countries
The United States
“The EPA estimates that the nation must invest $390 billion over the next 20 years to replace existing systems and build new ones to meet increasing demands” (ASCE)
Pharmaceuticals/Pharmacologically Active Compounds (
PhACs
)

Endocrine Disrupting Compounds (
EDCs
)

About
50%
-
90%
of a drug in its original or biologically active form can be excreted after human use

Compounds are unregulated in wastewater treatment process
What is "
safe"
?
"Mechanical treatment"
Removal of suspended solids and grits
Reduces the amount of BOD by 20-30% and suspended solids by 50-60%
Non-point sources
Sediment
Nitrogen & phosphorus
Pesticides
Point sources
Animal waste
Slaughtering waste
Vegetable washing water
Inorganic
wastewater
coal & steel
nonmetallic minerals
Organic
wastewater
pharmaceuticals, soaps, synthetic detergents, pesticides, herbicides
textiles
brewing
metal processing
tanneries
metal processing
Asbestos
Lead
Mercury
Nitrates
Phosphates
Sulfur
Oils
Petrochemicals
Wastewater comes from every room in the house
Blackwater
Graywater

The Current Situation
Aging infrastructure
Lack of funds
Largest polluter of phosphorous secreting into Lake Erie
Water Shut off
Job cuts
"Biological" treatment
Removal of dissolved organic matter
Conversion to Carbon Dioxide, water, and energy
85% reduction in BOD and suspended solids
Major technology updates
Infrastructure
Regulatory Standards
Funding
Huge Undertaking
~99% of impurities removed
Very expensive
Disinfection
-Combination of:
Rainwater runoff
Residential sewage
Industrial wastewater
-Can overflow after heavy rain/snowmelt events
POLLUTION
Linnea Johnson, Emily Bassett, Julianne Foisy
Full transcript