2. Air pressure in the wastewater system is
maintained by______.
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Thousands of homeowners dump similar, undiluted household chemicals down their own drains. But instead of being neutralized at sewage treatment plants, scientists have concluded, virtually all the organic chemicals simply evaporate into the air, where they are inhaled by people living nearby....
Aeration in an activated sludge process is based on pumping air into a tank, which promotes the microbial growth in the wastewater. ... After settling in a separate settling tank, bacteria forming the "activated sludge" flocks are continually recirculated back to the aeration basin to increase the rate of decomposition....
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WIND.
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