Reference Terms
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Activated sludge
Activated sludge is a process in sewage treatment in which air or oxygen is forced into sewage liquor to develop a biological floc which reduces the organic content of the sewage.
Note: The above text is excerpted from the Wikipedia article "Activated sludge", which has been released under the GNU Free Documentation License.
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Earth & Climate News
January 20, 2025
Jan. 13, 2025 — Scientists have mapped the amount of water stored beneath volcanic rocks at the crest of the central Oregon Cascades and found an aquifer many times larger than previously estimated -- at least 81 cubic kilometers. The finding has implications for ...
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Jan. 10, 2025 — The way cricket frogs move across the surface of water has long been thought to resemble walking on water, but researchers have now discovered a different ...
Jan. 9, 2025 — Hydroclimate whiplash -- rapid swings between intensely wet and dangerously dry weather -- has already increased globally due to climate change, with further large increases expected as warming continues, according to a team of ...
Latest Headlines
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Jan. 19, 2025 — Ecologists have identified significant ecological risks associated with the release of hybrid groupers into Hong Kong's coastal waters, a practice ...
Jan. 17, 2025 — New research emphasizes that studying the impacts of past tropical storms can help communities better prepare for future storms. A key part of the study is analyzing the types and quantities of ...
Jan. 17, 2025 — Salt pollution from road deicing salts threatens freshwater ecosystems and urban green infrastructure. New research on salt-tolerant plants like cattails highlights their potential role in mitigating ...
Jan. 17, 2025 — Atmospheric scientists show proposed 'geoengineering' effort to remove methane, a potent greenhouse gas, from the atmosphere could worse air quality while providing minimal climate ...
Jan. 17, 2025 — Scientists find a 'measure and remeasure' approach is a feasible method of verifying soil carbon storage in croplands for climate ...
Jan. 17, 2025 — Researchers, citizen scientists and their 'truffle dogs' -- have discovered two new species of truffle. Tuber canirevelatum, meaning the 'dog-found' truffle, was named in honor of truffle dogs and ...
Jan. 17, 2025 — Experiments and modeling reveal the unexpected structure that can be seen in bacteria grown in mucus samples and ...
Jan. 16, 2025 — A new tool could make it easier to study scarce plant molecules. Researchers have developed so-called microbial cell factories -- using E. coli and ...
Jan. 16, 2025 — Scientists use devices known as frequency comb lasers to search for methane in the air above oil and gas operations and to screen for signs of ...
Jan. 16, 2025 — Engineering researchers have developed carbon capture systems that use molecules called quinones, dissolved in water, as their capturing compounds. A new study provides critical insights into the ...