This document discusses how certain man-made chemicals persist in the environment and accumulate up the food chain, posing risks. It provides examples of persistent organic pollutants like DDT, PCBs, and heavy metals that accumulate in animals and can cause reproductive/developmental issues. These chemicals do not break down easily and accumulate more at higher trophic levels, as seen in the high PCB levels in orcas. Various species like amphibians have shown declines and deformities linked to such pollution. Bioremediation uses bacteria or plants to break down or absorb chemicals and help undo some environmental damage.
Middle School Science - an introduction to bioaccumulation and biomagnification in an ecosystem. Using DDT as an example and organic controls that can be used instead.
Biogeochemical cycle, any of the natural pathways by which essential elements of living matter are circulated. The term biogeochemical is a contraction that refers to the consideration of the biological, geological, and chemical aspects of each cycle.
The USEPA defines biodegradation as a process by which microbial organisms transform or alter (through metabolic or enzymatic action) the structure of chemicals introduced into the environment.
According to the definition by the International Union of Pure and Applied Chemistry, the term biodegradation is “Breakdown of a substance catalyzed by enzymes in vitro or in vivo.
The term is often used in relation to ecology, waste management, biomedicine, and the natural environment (bioremediation) and is now commonly associated with environmentally friendly products that are capable of decomposing back into natural elements.
Biodegradable matter is generally organic material such as plant and animal matter and other substances originating from living organisms, or artificial materials that are similar enough to plant and animal matter to be put to use by microorganisms.
Middle School Science - an introduction to bioaccumulation and biomagnification in an ecosystem. Using DDT as an example and organic controls that can be used instead.
Biogeochemical cycle, any of the natural pathways by which essential elements of living matter are circulated. The term biogeochemical is a contraction that refers to the consideration of the biological, geological, and chemical aspects of each cycle.
The USEPA defines biodegradation as a process by which microbial organisms transform or alter (through metabolic or enzymatic action) the structure of chemicals introduced into the environment.
According to the definition by the International Union of Pure and Applied Chemistry, the term biodegradation is “Breakdown of a substance catalyzed by enzymes in vitro or in vivo.
The term is often used in relation to ecology, waste management, biomedicine, and the natural environment (bioremediation) and is now commonly associated with environmentally friendly products that are capable of decomposing back into natural elements.
Biodegradable matter is generally organic material such as plant and animal matter and other substances originating from living organisms, or artificial materials that are similar enough to plant and animal matter to be put to use by microorganisms.
Micro stations d'épuration : Performance en conditions hivernales sévèresidealconnaissances
Intervention de Elmar Dorgeloh et Martina Defrain (Institut de Test pour l‘Épuration des Eaux), dans le cadre des 6èmes Assises Nationales de l'assainissement non collectif
Intervention de Philippe DANOIS, Chargé d'opération ANC, Agence de l'Eau Seine-Normandie, dans le cadre des 6èmes Assises Nationales de l'assainissement non collectif
It is a brief presentation made on Biomagnification at different tropic levels. Accumulation of toxic materials over time shows a drastic change and leads to severe consequences. Extinction of species is one of them.
Climate change is caused by carbon dioxide, but it is also linked to toxic chemicals. If we don't deal with the priority toxic chemicals, the reduction of carbon dioxide will have no impact
On the topic of Bioremediation.
Environmental Biotechnology -
the development, use and regulation of
biological systems for remediation of
contaminated environments (land, air,
water), and for environment-friendly
processes.
Bioremediation - the use of
microorganisms to remedy
environmental problems
What do they all have in common?
The advent of the Industrial Revolution
increase in products and waste
people moved to the city
increase in human population
Regulations were passed:
Resource Conservation and Recovery Act (1976)
Must identify hazardous waste and establish standards for managing it properly
Requires companies that store, treat or dispose to have permits stating how the wastes are to be managed
Record of its travels: Chain of Custody
EPA initiates the Superfund Program (1980)
Counteract careless and negligent practices
Environmental Genome Project
Study and understand the impacts of environmental chemicals on human diseases
Waste
Solid: landfills, combustion-including waste-to energy plants, recovery
slurries, composting
Liquid: septic: sewage treatment, deep-well injection
Gas: fossil fuels, chlorofluorocarbons
Hazardous –anything that can explode, catch fire, release toxic fumes, and particles or cause corrosion
Thanks!!
organic pollutants , are pollutants from organic pollutants
pollutants are substances which have adverse effects when present in the environment .
they are highly fat soluble , non biodegradable , can be transported for a long distance
it include DDT, dioxins,brominated dioxins, PCBs,Hexachlorobenzene,Polycyclic Aromatic Hydrocarbons (PAHs)
organic pollutants , are pollutants from organic pollutants
pollutants are substances which have adverse effects when present in the environment .
they are highly fat soluble , non biodegradable , can be transported for a long distance
it include DDT, dioxins,brominated dioxins, PCBs,Hexachlorobenzene,Polycyclic Aromatic Hydrocarbons (PAHs)
presentation was provided by Prof W.U Chandrasekara
Department of Zoology and Environmental Management
For Coastal and Marine resource management course
A Powerpoint intended for the South African Grade 11 Life Sciences syllabus. Contains information on environmental studies, water, air and land pollution, and environmental solutions.
This is a presentation by Dada Robert in a Your Skill Boost masterclass organised by the Excellence Foundation for South Sudan (EFSS) on Saturday, the 25th and Sunday, the 26th of May 2024.
He discussed the concept of quality improvement, emphasizing its applicability to various aspects of life, including personal, project, and program improvements. He defined quality as doing the right thing at the right time in the right way to achieve the best possible results and discussed the concept of the "gap" between what we know and what we do, and how this gap represents the areas we need to improve. He explained the scientific approach to quality improvement, which involves systematic performance analysis, testing and learning, and implementing change ideas. He also highlighted the importance of client focus and a team approach to quality improvement.
Welcome to TechSoup New Member Orientation and Q&A (May 2024).pdfTechSoup
In this webinar you will learn how your organization can access TechSoup's wide variety of product discount and donation programs. From hardware to software, we'll give you a tour of the tools available to help your nonprofit with productivity, collaboration, financial management, donor tracking, security, and more.
Synthetic Fiber Construction in lab .pptxPavel ( NSTU)
Synthetic fiber production is a fascinating and complex field that blends chemistry, engineering, and environmental science. By understanding these aspects, students can gain a comprehensive view of synthetic fiber production, its impact on society and the environment, and the potential for future innovations. Synthetic fibers play a crucial role in modern society, impacting various aspects of daily life, industry, and the environment. ynthetic fibers are integral to modern life, offering a range of benefits from cost-effectiveness and versatility to innovative applications and performance characteristics. While they pose environmental challenges, ongoing research and development aim to create more sustainable and eco-friendly alternatives. Understanding the importance of synthetic fibers helps in appreciating their role in the economy, industry, and daily life, while also emphasizing the need for sustainable practices and innovation.
We all have good and bad thoughts from time to time and situation to situation. We are bombarded daily with spiraling thoughts(both negative and positive) creating all-consuming feel , making us difficult to manage with associated suffering. Good thoughts are like our Mob Signal (Positive thought) amidst noise(negative thought) in the atmosphere. Negative thoughts like noise outweigh positive thoughts. These thoughts often create unwanted confusion, trouble, stress and frustration in our mind as well as chaos in our physical world. Negative thoughts are also known as “distorted thinking”.
Operation “Blue Star” is the only event in the history of Independent India where the state went into war with its own people. Even after about 40 years it is not clear if it was culmination of states anger over people of the region, a political game of power or start of dictatorial chapter in the democratic setup.
The people of Punjab felt alienated from main stream due to denial of their just demands during a long democratic struggle since independence. As it happen all over the word, it led to militant struggle with great loss of lives of military, police and civilian personnel. Killing of Indira Gandhi and massacre of innocent Sikhs in Delhi and other India cities was also associated with this movement.
Model Attribute Check Company Auto PropertyCeline George
In Odoo, the multi-company feature allows you to manage multiple companies within a single Odoo database instance. Each company can have its own configurations while still sharing common resources such as products, customers, and suppliers.
The Art Pastor's Guide to Sabbath | Steve ThomasonSteve Thomason
What is the purpose of the Sabbath Law in the Torah. It is interesting to compare how the context of the law shifts from Exodus to Deuteronomy. Who gets to rest, and why?
2024.06.01 Introducing a competency framework for languag learning materials ...Sandy Millin
http://sandymillin.wordpress.com/iateflwebinar2024
Published classroom materials form the basis of syllabuses, drive teacher professional development, and have a potentially huge influence on learners, teachers and education systems. All teachers also create their own materials, whether a few sentences on a blackboard, a highly-structured fully-realised online course, or anything in between. Despite this, the knowledge and skills needed to create effective language learning materials are rarely part of teacher training, and are mostly learnt by trial and error.
Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
Read| The latest issue of The Challenger is here! We are thrilled to announce that our school paper has qualified for the NATIONAL SCHOOLS PRESS CONFERENCE (NSPC) 2024. Thank you for your unwavering support and trust. Dive into the stories that made us stand out!
Palestine last event orientationfvgnh .pptxRaedMohamed3
An EFL lesson about the current events in Palestine. It is intended to be for intermediate students who wish to increase their listening skills through a short lesson in power point.
2. Chemical Pollutants
• Humans have been introducing synthetic
(man-made) chemicals into the environment.
Some examples are:
PCBs (polychlorinated
biphenyls) widely used in
paints, plastics, lubricants up
to 1977
DDT (an insecticide for
mosquitos) now banned in
many countries Dichloro-diphenyl trichloroethane
3. DDT
DDT was first used in WWII
to protect against diseases
such as typhus and malaria.
It is cheap and effective as
an insecticide – so it began to
be manufactured for home
use.
Before it was banned in 1972
by the EPA for use in
agriculture, 1,350,000,000
pounds of DDT had been
made in North America.
4.
5.
6.
7.
8. EFFECTS OF DDT
• DDT is found to have
estrogenic effects:
– Causes reproductive
disorders
– Weakens the shells of
eggs (eggs break or do
not hatch)
– Can also cause nervous
system/ immune system
disorders in animals
9. DDT – Used as an Insecticide
• DDT is used today in such
African nations as
Zimbabwe and Ethiopia to
control mosquitoes and
the tsetse fly.
• These two insects cause
serious diseases, such as
malaria and sleeping
sickness.
10. PCBs
• Used widely in products like
paints, plastics, etc as softening
agents from the 1930’s – 1970’s
• Banned in North America in 1977
• There are 209 different congeners
(different chemical structures)
• PCBs interfere with immune
function making an organism
more susceptible to disease
(ex: cancer)
11. Heavy Metals
• Heavy metals are metallic
elements that are toxic to
organisms.
– Levels of lead in the soil have
increased due to human
activities.
• Lead is not considered safe
at any level.
• Many electronics contain
lead and must be recycled
carefully.
• Lead can cause anemia and
nervous and reproductive
system damage.
12. Heavy Metals (con’t)
– Cadmium is also found in low levels naturally.
• Cadmium is used in the manufacture of plastics and
nickel-cadmium batteries.
• It is toxic to earthworms and causes many health
problems in fish.
• In humans, the main source of cadmium is exposure to
cigarette smoke.
– Cadmium causes lung diseases, cancer, and nervous
and immune system damage.
13. Heavy Metals (con’t)
– Mercury also is found naturally.
– Mercury has entered ecosystems through the burning of fossil
fuels, waste incineration, mining, and the manufacture of items
like batteries.
• Coal burning accounts for 40 percent of the mercury released into the
atmosphere.
– Mercury bioaccumulates in the brain, heart and kidneys of many
animals.
• Mercury compounds
bioaccumulate in fish, adding
risk for any organisms eating
fish.
14. Persistent Pollutants!
• Both DDT and PCBs are called
“persistent organic pollutants” (POPs)
• This is because they take a LONG time
to break down
HALF-LIFE = the time it takes for ½ the
substance to break down
Half-life (PCBs) = 8 -10 years
Half-life (DDT) = 15 years
15. Bioaccumulation
• Bioaccumulation is the “build-up of
chemicals in living organisms”.
• The chemical accumulates because it
does not break down easily
(decomposers can’t break them down)
• The chemicals get stored in fat-cells of
organisms and can cause serious
problems...
NOTE: Accumulation is measured in parts per million (ppm)
16.
17. Bioaccumulation - EFFECTS
• How it affects organisms:
– Birth defects
– Failure to reproduce
• Amphibians live on both land and in the water.
– Amphibians are sensitive to chemical changes in the
environment and are valuable indicators of environmental
health.
– Since the 1980s, many of the world’s amphibian species
have suffered declines in population.
– There also have been alarming increases in amphibian birth
deformities.
18. Amphibians, like this frog, have exhibited drastic changes
since the 1980s.
o Many theories attempt to explain these changes, including
drought, increased UV rays, pollution, habitat loss, parasites,
and diseases.
19.
20. How BIOACCUMULATION affects ecosystems:
If an important part of the food chain cannot
reproduce, the whole food chain is affected.
Keystone species = species that can
greatly affect population numbers &
health of ecosystem.
21.
22.
23. Biomagnification
Biomagnification is
the process where
chemicals accumulate
AND become more
concentrated at each
trophic level of the
food chain.
24.
25.
26.
27. ORCAS- Biomagnification
• The PCB load of orcas (whales) is
the highest of any animal in the
world.
• PCBs concentrate in the blubber of
the whale
• When the blubber is burned for
energy, the PCBs are released into
bloodstream (where they affect
immune function).
• Calves are born with the same PCB
level as mother and then obtain
more through milk.
• PCB’s will affect the reproductive
cycles of orcas until at least 2030.
Reproductive success of BC’s resident orcas may be affected until 2030
28.
29.
30. Undoing the Damag e
• Science has found ways of reducing the effects of
chemical pollution on the environment...
BIOREMEDIATION
Using living organisms (plants, bacteria) to naturally
cleanup chemical pollutants through biodegradation
Chemical-eating bacteria and
micro-organisms can break down
chemicals into non-toxic
compounds!
31. Rhodococcus bacteria can
biodegrade PCBs Bacteria can be used to clean
up oil spills and underground leaks
32.
33. A Bright Idea!
Recently, scientists
were able to change
a gene in these
chemical-eating
bacteria allowing
them to fluoresce
(glow) when they are
in contact with oil or
other chemical
pollutants!
34. Bioremediation With Plants
• Plants can also be used to help
trap hazardous wastes such as
heavy metals
• The plants uptake the metals
and trap them in their tissues
• Plants also help stabilize by
reducing wind and water erosion
(that would spread
contaminants).