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These flies are commonly encountered in temperate areas of Europe, Siberia, and northern China. They have been introduced to North America. [12] They are parasites of elk, deer, and other deer family members, burrowing through the fur and sucking the blood of the host animals. Adults are only 5–7 mm (0.20–0.28 in) in length and brownish in ...
Facultative lagoon (polishing pond) providing tertiary treatment after a constructed wetland in Hamburg-Allermöhe, Germany. Overflow from the facultative lagoon may be routed through one or more polishing ponds supporting lower populations of anaerobic micro-organisms and a higher proportion of aerobic organisms adapted to survival in lower concentrations of organic material.
The ponds or basins may range in depth from 1.5 to 5.0 meters. [ 6 ] In a surface-aerated system, the aerators provide two functions: they transfer air into the basins required by the biological oxidation reactions, and they provide the mixing required for dispersing the air and for contacting the reactants (that is, oxygen, wastewater and ...
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Chrysopsinae is an insect subfamily in the family Tabanidae commonly known as deer flies or sheep flies and are bloodsucking insects considered pests to humans and cattle. [3] They are large flies with large brightly-coloured compound eyes, and large clear wings with dark bands. [4] They are larger than the common housefly and smaller than the ...
The deer "decided to take a midnight swim and needed a little assistance getting out of the pool," the sheriff's office wrote in a Facebook post, which received nearly 400 reacts. The deputies ...
One commonly-used tool to reduce the severity of these lake management problems is to eliminate or lessen thermal stratification through aeration. [2] Many types of aeration equipment have been used to reduce or eliminate thermal stratification. Aeration has met with some success, although it has rarely proved to be a panacea. [10]
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