Environmental Chemistry: Earth Spheres, Industrial Ecology, and the Anthrosphere

Comprehensive vocabulary flashcards covering the chemical and physical principles of the hydrosphere, atmosphere, geosphere, biosphere, anthrosphere, and industrial ecology.

Hydrosphere

The environmental sphere containing Earth's water, covering $70\%$ of the Earth's surface, with $>97\%$ stored in oceans and most of the remainder existing as ice.

Biochemical Oxygen Demand (BOD)

A measure of the oxygen consumed by biodegradable organic matter ($\text{CH}_2\text{O}$), such as municipal sewage, during aerobic microbial decomposition: $\text{CH}_2\text{O} + \text{O}_2(g) \rightarrow \text{CO}_2 + \text{H}_2\text{O}$.

Eutrophication

The excessive proliferation of algae in water bodies caused by nutrient enrichment (dissolved sulfates, potassium ions, and nitrogen compounds) primarily from agricultural runoff.

Hydrophilic substances

Compounds that readily dissolve in water, migrating with the flow into groundwater aquifers or being removed from the atmosphere via precipitation.

Hydrophobic substances

Compounds that are repelled by water, which tend to remain in the atmosphere or bind onto mineral surfaces in groundwater and surface water sediments.

Landfill leachate plume

A contaminant zone formed when precipitation infiltrates buried landfill waste and migrates beneath the water table into sandy and clay strata.

Troposphere

The lowest layer of the atmosphere extending to an altitude of approximately $11\,\text{km}$, characterized by temperatures dropping from $15^\circ\text{C}$ at sea level down to $-56^\circ\text{C}$ at its upper boundary.

Stratosphere

The atmospheric layer extending directly above the tropopause where temperature increases with altitude from $-56^\circ\text{C}$ to $-2^\circ\text{C}$ as ozone ($\text{O}_3$) absorbs solar ultraviolet radiation.

Atmospheric Layers

The thermal division of Earth's protective gas envelope into the troposphere ($7\text{--}16\,\text{km}$), stratosphere ($50\,\text{km}$), mesosphere ($80\,\text{km}$), thermosphere ($500\,\text{km}$), and exosphere, separated by respective pauses.

Photochemical reaction

An atmospheric reaction driven by the absorption of ultraviolet radiation photons with energy equal to $h\nu$, where $h$ is Planck's constant and $\nu$ is frequency in $\text{s}^{-1}$.

Greenhouse effect

The temperature-stabilizing atmospheric process in which gases such as $\text{CO}_2$ absorb incoming solar infrared radiation and prevent it from immediately escaping into space.

Industrial Ecology

A field of study that views industrial systems as artificial ecosystems, seeking to mimic natural systems by conserving, recycling, and exchanging materials and energy between neighboring entities.

Industrial Symbiosis

A cooperative network—exemplified by Kalundborg, Denmark—where wastes or by-products from facilities like power plants, oil refineries, and pharmaceutical plants become feedstocks for gypsum wallboard plants, cement factories, and fish farms.

Green chemistry

The practice of chemical science and technology designed to avoid environmental pollution by preventing waste, minimizing energy consumption, and using safe, non-toxic, renewable materials.

Biosphere

The collective sphere encompassing all living entities on Earth, which mediates biogeochemical cycles, soil formation, and atmospheric oxygenation.

Biodegradation

The breakdown of biomass by living organisms to prevent environmental accumulation, taking place either through aerobic respiration or anaerobic fermentation ($2\{\text{CH}_2\text{O}\} \rightarrow \text{CO}_2(g) + \text{CH}_4(g)$).

Population crash

An abrupt, unchecked decline in an ecosystem's species population following exponential growth, induced by resource depletion, waste accumulation, or predation.

Toxicology

The scientific study of poisons and toxicants that destroy living tissues or disrupt vital biochemical mechanisms.

Geosphere

The solid, non-living terrestrial part of the Earth comprising a solid iron-rich inner core, an outer core, a mantle, and an outer crust.

Earth Crust

The outermost solid layer of the geosphere ($5\text{--}40\,\text{km}$ in depth) where humans reside and extract food, building materials, minerals, and fossil fuels.

Anthrosphere

The environmental sphere constructed, modified, and inhabited by humans for their activities, functioning as the primary origin of environmental pollutants and toxic emissions.

Technology

The ways in which humans construct and operate the anthrosphere using materials and energy, derived from engineering-based science explaining energy, matter, time, and space.

Hazardous Wastes

Substances discarded from industrial or anthropogenic processes that are toxic, corrosive, flammable, or chemically reactive (explosive), presenting contamination threats to air and water.

End-of-pipe measures

Waste management techniques that collect, treat, or remediate pollutants after generation, including electrostatic precipitators for particulates and flue gas desulfurization for $\text{SO}_2$.

Evolution of the Anthrosphere

The historical progression of dealing with industrial pollution, advancing through: 1) ignoring pollution and dumping wastes, 2) end-of-pipe pollution control, to 3) closing the loop by fully integrating industrial cycles with the environment.