This PPT speaks about the concept of environment and various types of pollution our human society faces in its day today life .It also covers the impact of environmental pollution on all the dimensions of development as well the need for environmental protection and so on
1. ENVIRONMENTAL PROTECTIONENVIRONMENTAL PROTECTION
Dr. R. DakshinamurthyDr. R. Dakshinamurthy
Associate ProfessorAssociate Professor
Centre for study of social Exclusion andCentre for study of social Exclusion and
Inclusive Policy,Inclusive Policy,
Bharathidasan University,Bharathidasan University,
Tiruchirappalli.Tiruchirappalli.
2. WHAT IS ENVIRONMENTWHAT IS ENVIRONMENT
The sum total of all surroundings of aThe sum total of all surroundings of a
living organism, including natural forcesliving organism, including natural forces
and other living things, which provideand other living things, which provide
conditions for development and growth asconditions for development and growth as
well as of danger and damage.well as of danger and damage.
3. ENVIRONMENTAL POLLUTIONENVIRONMENTAL POLLUTION
Environmental pollution is the discharge ofEnvironmental pollution is the discharge of
material, in any physical state, that ismaterial, in any physical state, that is
dangerous to the environment or humandangerous to the environment or human
health.health.
The most common pollutants are usuallyThe most common pollutants are usually
chemicals, garbage, and waste water.chemicals, garbage, and waste water.
4. EXTENT OF ENVIRONMENTALEXTENT OF ENVIRONMENTAL
POLLUTIONPOLLUTION
Environmental pollution is happening inEnvironmental pollution is happening in
many parts of the world, especially in formmany parts of the world, especially in form
of air and water pollution. The bestof air and water pollution. The best
example for air pollution are some ofexample for air pollution are some of
China's cities, including capital Beijing,China's cities, including capital Beijing,
and the best example for water pollution isand the best example for water pollution is
India with its Ganges river pollutionIndia with its Ganges river pollution
problem.problem.
5. Cont….Cont….
Globally environmental pollution problemGlobally environmental pollution problem
is much bigger than we think it is, even inis much bigger than we think it is, even in
many our cities there are problems withmany our cities there are problems with
dirty air, or sound pollution from trafficdirty air, or sound pollution from traffic
and different other disturbing noises.and different other disturbing noises.
6. Cont…..Cont…..
The most severe environmental pollution
is happening in developing countries of
the third world because not only to they
lack any form of sustainable
management but they also lack even the
basic sanitation so you can imagine how
bad is the environmental condition in
these countries.
7. IMPACT OF ENVIROMENTAL POLLUTIONIMPACT OF ENVIROMENTAL POLLUTION
Pollution of the environment is causing greatPollution of the environment is causing great
damage to ecosystem that depend upon thedamage to ecosystem that depend upon the
health of this environment. Air and water pollutionhealth of this environment. Air and water pollution
can cause death of many organisms in givencan cause death of many organisms in given
ecosystem, including humans. Water pollutionecosystem, including humans. Water pollution
according to some estimates cause 14.000according to some estimates cause 14.000
deaths each day in the world, most of them indeaths each day in the world, most of them in
India. This is really no surprise when you look atIndia. This is really no surprise when you look at
the data that says that 700 million Indians do notthe data that says that 700 million Indians do not
even have access to a proper toilet, whethereven have access to a proper toilet, whether
alone clean water.alone clean water.
8. Many developed countries haveMany developed countries have
introduced certain laws to not onlyintroduced certain laws to not only
regulate various types of pollution but alsoregulate various types of pollution but also
the laws to mitigate the adverse effects ofthe laws to mitigate the adverse effects of
pollution. Pollution levels need to bepollution. Pollution levels need to be
controlled all the time if we want to keepcontrolled all the time if we want to keep
our environment safe and healthyour environment safe and healthy
cont…cont…
9. Con…Con…
Without proper pollution controlWithout proper pollution control
environment soon becomes unhealthy.environment soon becomes unhealthy.
Preventing introduction of pollutants intoPreventing introduction of pollutants into
some environment is the best way tosome environment is the best way to
protect environment from pollution. To doprotect environment from pollution. To do
so it is important to develop ecologicalso it is important to develop ecological
conscience of nearby communities, andconscience of nearby communities, and
effective waste management in form ofeffective waste management in form of
recycling.recycling.
10. cont..cont..
Healthy environment is prerequisite ofHealthy environment is prerequisite of
healthy life for us and our children, andhealthy life for us and our children, and
fighting pollution is definitely the best wayfighting pollution is definitely the best way
to keep our environmental healthy.to keep our environmental healthy.
12. Voluntary environmentalVoluntary environmental
agreementsagreements
Ecosystems approachEcosystems approach
International environmentalInternational environmental
agreementsagreements
APPROACHES TO ENVIRONMENTAL APPROACHES TO ENVIRONMENTAL
PROTECTIONPROTECTION
13. In industrial countries, voluntary environmental In industrial countries, voluntary environmental
agreements often provide a platform for agreements often provide a platform for
companies to be recognized for moving beyond companies to be recognized for moving beyond
the minimum regulatory standards and thus the minimum regulatory standards and thus
support the development of best environmental support the development of best environmental
practice. For instance, in India, Environment practice. For instance, in India, Environment
Improvement Trust (EIT) has been working for Improvement Trust (EIT) has been working for
environment & forest protection since 1998. A environment & forest protection since 1998. A
group of Green Volunteers get a goal of Green group of Green Volunteers get a goal of Green
India Clean India concept. India Clean India concept.
VOLUNTARY ENVIRONMENTAL
AGREEMENTS
14. Ecosystems approachEcosystems approach
An ecosystems approach to resource An ecosystems approach to resource
management and environmental protection management and environmental protection
aims to consider the complex aims to consider the complex
interrelationships of an entire ecosystem in interrelationships of an entire ecosystem in
decision making rather than simply decision making rather than simply
responding to specific issues and challenges. responding to specific issues and challenges.
15. cont…cont…
Ideally the decision-making processes under Ideally the decision-making processes under
such an approach would be a collaborative such an approach would be a collaborative
approach to planning and decision making approach to planning and decision making
that involves a broad range of stakeholders that involves a broad range of stakeholders
across all relevant governmental across all relevant governmental
departments, as well as representatives of departments, as well as representatives of
industry, environmental groups and industry, environmental groups and
community. This approach ideally supports a community. This approach ideally supports a
better exchange of information, development better exchange of information, development
of conflict-resolution strategies and improved of conflict-resolution strategies and improved
regional conservation.regional conservation.
16. International environmentalInternational environmental
agreementsagreements
Many of the earth's resources areMany of the earth's resources are
especially vulnerable because they areespecially vulnerable because they are
influenced by human impacts acrossinfluenced by human impacts across
many countries. As a result of this, manymany countries. As a result of this, many
attempts are made by countries toattempts are made by countries to
develop agreements that are signed bydevelop agreements that are signed by
multiple governments to prevent damagemultiple governments to prevent damage
or manage the impacts of human activityor manage the impacts of human activity
on natural resources.on natural resources.
17. This can include agreements that impactThis can include agreements that impact
factors such as climate, oceans, riversfactors such as climate, oceans, rivers
and air pollution. These internationaland air pollution. These international
environmental agreements are sometimesenvironmental agreements are sometimes
legally binding documents that have legallegally binding documents that have legal
implications when they are not followedimplications when they are not followed
and, at other times, are more agreementsand, at other times, are more agreements
in principle or are for use as codes ofin principle or are for use as codes of
conduct.conduct.
cont ….cont ….
Hinweis der Redaktion
BUT THERE ARE MANY FORMS OF CORROSION OTHER THAN PITTING. THESE ARE NINE GENERAL CATAGORIES OF CORROSION. EACH OF THESE CATAGORIES HAS SEVERAL, IF NOT MANY, SUB-CATAGORIES WITH ITS OWN CHARACTERISTICS, CAUSES, AND CURES. BEING ABLE TO RECOGNIZE THE TYPE OF CORROSION CAUSING A PROBLEM IS A MAJOR PART OF THE CORROSION CONTROL PROCESS.
THERE ARE MANY VARIABLES THAT WILL AFFECT WHAT HAPPENS IN THE CORROSION PROCESS. SOME OF THEM ARE SHOWN HERE. THIS IS WHY A PERSON QUALIFIED AND KNOWLEDGEABLE IN THE CAUSES AND CONTROL OF CORROSION NEEDS TO BE INTIMATELY INVOLVED IN ANY PROJECT INVOLVING CORRODIBLE MATERIALS.
THESE ARE FOUR METHODS OF CORROSION CONTROL. THERE ARE OTHER METHODS ALSO. CATHODIC PROTECTION IS NOT USUALLY APPLIED BY ITSELF. MATERIAL SELECTION IS MOST OFTEN MADE BY CONSIDERATIONS SUCH AS STRUCTURAL AND ECONOMIC RATHER THAN FOR THE CORROSION RESISTANCE ASPECT. COATINGS, THEN ARE USUALLY NECESSARY TO MINIMIZE CORROSION ON THE MATERIAL SELECTED. MATERIALS AND COATINGS USUALLY DO NOT OFFER ADEQUATE PROTECTION UNTO THEMSELVES. FOR EXAMPLE, STAINLESS STEEL IS USUALLY EXPENSIVE AND IS USED ONLY IN CRITICAL AREAS SUCH AS AT MITER SEALS. HOWEVER, THE USE OF CARBON STEEL NEXT TO THE STAINLESS STEEL WILL CAUSE THE CARBON STEEL TO CORRODE VERY FAST SINCE IT WILL ACT AS AN ANODE TO PROTECT THE STAINLESS STEEL. COATING THE CARBON STEEL WILL CAUSE SEVERE PITTING CORROSION WHERE THE COATING IS NOT PERFECT. CONSEQUENTLY, FOR LONG STRUCTURE LIFE, CATHODIC PROTECTION IS NECESSARY TO PROTECT THE UNDERLYING METAL WHERE THE COATING IS DAMAGED OR WHERE HOLIDAYS OCCURRED IN THE ORIGINAL COATING.
Cathodic protection, properly applied, is one method of providing corrosion control. This drawing shows basically how cathodic protection works to mitigate the pitting corrosion previously shown. By putting an anode in the electrolyte near the structure and connecting it electrically to the structure, all points on the structure become cathodic with respect to the anode. Hence the structure is protected and the anode corrodes.
THIS ILLUSTRATION ACCOMPLISHES THE SAME FUNCTION AS THE PREVIOUS ARRANGEMENT EXCEPT THAT THE VOLTAGE AND CURRENT FROM THE ANODE ARE FURNISHED BY AN ELECTRICAL POWER SUPPLY (RECTIFIER) PASSING CURRENT THROUGH A VERY DURABLE, NON-DETERIORATING CONDUCTING MATERIAL (SUCH AS HIGH SILICON CAST IRON, GRAPHITE OR CERAMIC) WHICH SERVES AS THE ANODE. THE ADVANTAGE OF USING THE RECTIFIER IS THAT THE VOLTAGE AND CURRENT CAN BE VARIED OVER A MUCH WIDER RANGE AND, IF PROPERLY INSTALLED AND MAINTAINED, WILL PROVIDE MUCH LONGER SYSTEM LIFE AND BETTER PROTECTION.
WHEN DESIGNING A CATHODIC PROTECTION SYSTEM, IT IS NOT SUFFICIENT TO JUST PUT SOME ANODES OUT THERE AROUND THE STRUCTURE AND HOPE FOR THE BEST. MANY VARIABLES COME INTO PLAY SUCH AS THOSE SHOWN HERE. WHILE SOME STRUCTURES MIGHT SEEM IDENTICAL TO ANOTHER, THERE COULD BE SOME IMPORTANT DIFFERENCES. THEREFORE A DESIGN MADE FOR ONE STRUCTURE SHOULD NOT BE APPLIED TO A SIMILAR STRUCTURE AT ANOTHER LOCATION WITHOUT A QUALIFIED CORROSION SPECIALIST’S APPROVAL.
CATHODIC PROTECTION SYSTEMS ARE ALMOST ALWAYS DESIGNED TO WORK AS A SUPPLEMENT TO COATINGS ON STRUCTURES. TO GET THE BEST AND LONGEST LASTING CORROSION PROTECTION FROM THE COATING SYSTEM IT IS ESSENTIAL THAT ALL SURFACES BE PROPERLY PREPARED. SOME COATING SYSTEMS ARE NOT SUITABLE FOR USE IN A PARTICULAR ENVIRONMENT OR WITH CATHODIC PROTECTION SYSTEMS. ONCE THE BEST SYSTEM IS SELECTED IT IS CRITICAL THAT IT BE APPLIED, USING PROPER SOLVENTS, APPLICATION TOOLS, TIMES BETWEEN APPLICATIONS, ETC. MANY STRUCTURES HAVE BEEN DAMAGED BECAUSE THE COATINGS WERE NOT PROPERLY APPLIED. CP EQUIPMENT MUST BE PURCHASED AND INSPECTED TO ASSURE COMPLIANCE WITH DESIGN SPECIFICATIONS. CP SYSTEMS ARE NOT COMMONLY INSTALLED BY THE NORMAL WORKMEN AND CONSEQUENTLY THEY DO NOT HAVE KNOWLEDGE OF WHAT IS IMPORTANT IN THE INSTALLATION OF CP EQUIPMENT. IT IS THEREFORE VERY IMPORTANT THAT ALL WORK AND PROCEDURES BE APPROVED AND INSPECTED BY PERSONNEL SPECIALIZED AND QUALIFIED IN CP. QUALIFIED PERSONNEL SHOULD ALSO BE PRESENT DURING ENERGIZING, ADJUSTMENT, AND TESTING OF THE COMPLETED SYSTEMS.
ONCE CORROSION OCCURS CATHODIC PROTECTION CAN’T REPAIR THE DAMAGE TO THE STRUCTURE, IT CAN ONLY PREVENT ADDITIONAL DAMAGE. TO HAVE COST EFFECTIVE, PROPERLY MAINTAINED CATHODIC PROTECTION SYSTEMS, IT IS NECESSARY TO HAVE A WELL ORGANIZED AND CONSTANT PROGRAM IN PLACE. ON IMPRESSED CURRENT SYSTEMS AT LOCKS, LOCK OPERATORS CAN TAKE RECTIFIER READINGS WEEKLY AND SEND THEM TO THE DISTRICT CP SPECIALIST WHERE HE CAN DETERMINE IF ANYTHING DRASTIC HAS HAPPENED TO THE SYSTEM. SHORTED ANODES AND BLOWN FUSES IN THE RECTIFIERS CAN BE DETECTED IN THIS WAY. FIELD MAINTENANCE PERSONNEL CAN BE DISPATCHED BY OPERATIONS DIV. TO MAKE THE NECESSARY REPAIRS. SOME CHANGES IN CP SYSTEMS OCCUR GRADUALLY OVER A LONG PERIOD OF TIME. AN ANNUAL SURVEY OF PROTECTIVE POTENTIALS TAKEN AT ALL AREAS OF MITER GATES AND OTHER STRUCTURES SHOULD BE MADE AND THE RESULTS SENT TO THE CP SPECIALIST FOR HIS ANALYSIS. MAJOR ADJUSTMENTS TO RECTIFIERS SHOULD BE MADE ONLY AS HE DIRECTS. IF MAJOR ADJUSTMENTS ARE REQUIRED ADDITIONAL TESTS AND ADJUSTMENTS MAY BE NECESSARY AFTER A WEEK OR MORE. THE DISTRICT CP SPECIALIST SHOULD CONDUCT OR ATTEND THE ANNUAL SURVEY AT LEAST EVERY THREE YEARS TO MAKE SURE TESTS ARE BEING CONDUCTED PROPERLY AND TO MAKE NOTE OF SIGNIFICANT CHANGES IN THE STRUCTURE THAT MIGHT AFFECT THE CORROSION CONTROL MEASURES NEEDED. ANY REPAIRS TO THE CP SYSTEMS OR TO THE STRUCTURE ITSELF SHOULD BE DONE AS SOON AS POSSIBLE TO MINIMIZE FURTHER DAMAGE DUE TO CORROSION.
CORROSION NEVER SLEEPS AND IT TAKES MANY FORMS. I SHOWED YOU A LIST OF NINE DIFFERENT CATAGORIES OF CORROSION. CORROSION CONTROL IS A PROVEN WAY TO SAVE MONEY AND TO KEEP EQUIPMENT OPERATING. THERE ARE ALSO BENEFITS IN SAFETY AND ENVIRONMENTAL CONCERNS. PROPERLY APPLIED CATHODIC PROTECTION, IN CONJUNCTION WITH GOOD COATINGS, IS A PROVEN METHOD OF PROVIDING CORROSION CONTROL ON BURIED AND SUBMERGED METAL STRUCTURES. IN SOME SITUATIONS, FOR EXAMPLE ON UNDERGROUND FUEL STORAGE TANKS OR GAS PIPE LINES, IT IS REQUIRED BY LAW. BECAUSE OF THE COMPLEXITIES OF CORROSION AND CORROSION CONTROL TECHNIQUES, SUCH AS CATHODIC PROTECTION, IT IS CRITICAL THAT CORROSION SPECIALISTS BE USED THROUGHOUT THE LIFE OF THE PROJECT.