Barrons AP Environmental Science

Figure 9.8 Types of material found in the “Great Pacific Garbage Patch” The “garbage patch” formed gradually ...

CASE STUDY GULF OF MEXICO DEAD ZONE: Currently, the Gulf of Mexico’s dead zone, off the coast o ...

EXXON VALDEZ (1989): In 1989, the oil tanker Exxon Valdez spilled 11 to 30 million gallons (42 to 110 ...

(because groundwater recharge is lessened) and flooding since the amount of water that remains ...

WATER QUALITY—WATER TESTING Water quality refers to the chemical, physical, and biological characteristics of water. ...

and thus contributes to the overloading and pollution of natural water systems. Biological Oxygen Demand (BOD) The BO ...

Heavy Metals (Pb, Hg, Cd, Se) The most common metal pollution in freshwater comes from mining companies. When ...

carbon dioxide produced by respiration processes (in both plants [dark cycle] and animals) will lower the ...

death. High levels of total dissolved solids (TDS) can affect water clarity and photosynthesis and lead to a ...

These solids may come from soil erosion or channelization from dredging. Increased water flow rates ero ...

■ FILTRATION—removes clays, natural organic matter, precipitants, and silts from the treatment process. Filtration ...

Figure 9.9 A typical septic system Sewage (Wastewater) Treatment Facilities Wastewater treatment is a process th ...

Secondary treatment is designed to substantially degrade the organic and biological content of th ...

Figure 9.10 Sewage treatment plant DISPOSING OF SOLID WASTES FROM SEWAGE TREATMENT PLANTS Sewage sludge is ...

potential environmental effects of proposed federal agency actions. CLEAN WATER ACT (1972): This act established ...

the United States Figure 9.12 Solid waste flow diagram Types of solid wastes include: ■ ORGANIC—kitchen wast ...

destined for reuse, resale, salvage, recycling, disposal in landfills or the ocean, or for scrap (copper, ...

valuable materials. Local governments are addressing these challenges through a variety of strategies, as listed in ...

Pros ■ Released heat energy can be used to generate electricity. ■ Incineration reduces the impact on landfills. ...

■ The public will likely react poorly to the odor, vermin, and insects. ■ People may say NIMBY (not in my ...