Environmental Chemist ry I
•
Environment al Chemist ry, Sevent h Edit ion,
1994 by St anley E. M anahan
Syllabus
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Introduction
•
Aquatic Chemistry
–
Basic Principles–
Oxidat ion-Reduct ion–
Phase Int eract ions–
Aquat ic M icrobial Biochemist ry–
Wat er Pollut ion–
Wat er Treat ment•
Atmospheric Chemistry
–
Basic Principles–
Part icles in t he at mosphere–
Gaseous Inorganic Air Pollut ant s–
Organic Air Pollut ant s–
Phot ochemical Smog–
The Endangered Global At mosphereEvaluat ion
•
Presence
•
Task
•
Environmental science
is t he science of t he
complex int eract ions t hat occur among t he
t errest rial, at mospheric, aquat ic, living, and
ant hropological environment s.
•
Environmental science
has evolved int o
ecology
.
ENVIRONM ENTAL CHEM ISTRY & ENVIRONM ENTAL BIOCHEM ISTRY
•
Environmental chemistry
is t he st udy of t he
sources, react ions, t ransport , effect s, and
fat es of chemical species in wat er, soil, air, and
living environment s and t he effect of
t echnology t hereon.
•
Environmental biochemistry
is t he st udy t hat
deals specifically w it h t he effect s of
•
Water and The hydrosphere
–
Wat er is an essent ial part of all living syst ems and is t he medium from w hich life evolved and inw hich life exist s.
•
Air and The atmosphere
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Earth and The geosphere
–
The most import ant part of t he geosphere for life on eart h is soil formed by t he disint egrat ivew eat hering act ion of physical, geochemical, and biological processes on rock.
•
Life and The biosphere
•
The Anthrosphere and Technology
–
The survival of humankind and of t he planet t hat support s it now requires t hat t he est ablished two-way interaction bet w een science and t echnology become a three-way relationship includingTHE BIOSPHERE
•
There is a st rong int erconnect ion bet ween t he
biosphere and t he ant hrosphere.
•
Humans depend upon t he biosphere for food,
fuel, and raw mat erials.
•
An
understanding of ecology
is essent ial in t he
management of modern
industrialized societies
in ways t hat are compat ible w it h
environmental
preservation and enhancement
.
•
Applied ecology
deals w it h predict ing t he
impact s of
technology
and development and
making recommendat ions such t hat t hese
ENERGY AND CYCLES OF ENERGY
•
Biogeochemical cycles
(biological, geological,
and chemical)
on Eart h are driven by energy from
t he sun.
•
During t he last t wo cent uries, enormous human
impact on
energy utilization
has result ed in many
of t he
environmental problems
now facing
humankind.
•
M at erials cycles may be divided bet ween
endogenic cycles and exogenic cycles.
•
Endogenic cycles
involve subsurface rocks of
various kinds.
•
Biogeochemical cycles can be described as
elemental cycles
involving
nutrient elements
HUM AN IM PACT AND POLLUTION
•
The demands of
increasing population
coupled w it h
the desire
of most people for a
higher mat erial st andard of living are result ing
in
worldw ide pollution
on
a massive scale
.
•
Environment al pollut ion can be divided
among t he cat egories of
water, air, and land
pollution
.
•
For example, some gases emit t ed t o t he
at mosphere can be convert ed t o st rong acids
by at mospheric chemical processes, fall t o t he
eart h as acid rain, and pollut e wat er w it h
acidit y.
•
Some of t he major ways in w hich
modern
technology
has cont ribut ed t o
environmental
alteration and pollution
are t he follow ing:
–
Agricultural practices t hat have result ed inint ensive cult ivat ion of land, drainage of w et lands, irrigat ion of arid lands, and applicat ion of
–
M anufacturing of huge quant it ies of indust rial product s t hat consumes vast amount s of raw mat erials and produces large quant it ies of airpollut ant s, w at er pollut ant s, and hazardous w ast e by-product s.
–
Energy product ion and ut ilizat ion w it henvironment al effect s t hat include disrupt ion of soil by mining, pollut ion of w at er by release of salt -w at er from pet roleum product ion, and
emission of air pollut ant s such as acid-rain-forming sulfur dioxide.
–
M odern transportation pract ices, part icularly•
There are numerous ways in w hich t echnology
can be applied t o minimize environmental
impact .
–
Use of state-of-the-art computerized control t o achieve maximum energy efficiency, maximumut ilizat ion of raw mat erials, and minimum product ion of pollut ant by-product s.
–
Applicat ion of processes and materials t hat enable maximum mat erials recycling andminimum w ast e product product ion, for example, advanced membrane processes for w ast ew at er t reat ment t o enable w at er recycling.
–
Use of best available catalysts for efficient synt hesis.