By Anne E Maczulak
That includes full-color images and line illustrations, this ebook explores equipment in pollutants cleanup. It takes readers in the course of the step by step strategy of discovering, trying out, and cleansing up dangerous waste websites, starting with illness evaluate and finishing with a wiped clean and restored physique of land or water.
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Additional info for Cleaning Up the Environment: Hazardous Waste Technology
Technicians then recover the metals, organic chemicals, and cleaned water and send them either to a disposal site or a facility that reuses them. In some spots, however, SQI could not work. A nightmare of trenches, pits, basins, and pools overflowed with hazardous substances and needed pumping or excavation rather than SQI. Extraction and Stabilization Excavation removes polluted soils; extraction removes toxic liquids from soils. Pollution extraction can be either active or passive, depending on the energy required for doing the job.
These low concentration levels are explained in the “Parts Measuring Contamination 19 Parts per Million and Parts per Billion M any pollutants are dangerous in minute amounts in the living tissue of humans or animals. Environmental scientists therefore measure hazardous chemicals in units called parts per million (ppm), parts per billion (ppb), and even parts per trillion (ppt). These are equal to mg/L, µg/L, and ng/L, respectively. Polluted water sometimes contains large amounts of sediments or salts.
Plant scientists seek plant varieties that extract greater amounts of contaminants, and more quickly. These plants are called hyperaccumulator plants. Hyperaccumulators that take up metals usually live in areas Excavation of Contaminated Sites 41 with naturally high soil metal concentrations. Their roots have evolved the ability to bind large amounts of metal ions, perhaps as a guard against metal toxicity—some plants even absorb radioactive uranium. Unfortunately, hyperaccumulator plants have two disadvantages that must be overcome for them to be useful in contaminant cleanup.