Fly ash is a solid waste, but it has been used in sewage treatment extensively.

粉煤灰虽然是一种固体废弃物，但已广泛应用于污水处理。

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Volatile organic acids are the main products in sludge digestion process in sewage treatment plants.

挥发性有机酸(如乙酸)是污水处理厂污泥消化工艺中的主要产物。

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A new concept is provided for the selection of sludge treatment technology in sewage treatment plant.

为污水处理厂污泥处理工艺选择提供了一种新的思路。

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Several varieties of carp imported from Asia have migrated steadily northward in the Mississippi River and its tributaries since escaping from Southern fish farms and sewage treatment ponds in the 1970s.

WSJ: Asian carp spawning areas wider than expected

Other times the attacks are more personal:In 2000 a discontented consultant, rejected for a job at a water treatment plant in Australia, remotely hacked into a sewage treatment system and released 264, 000 gallons of raw sewage into rivers and parks.

FORBES: The Next Threat

Kelda Water Services and its sister company Yorkshire Water are supplying the council with the biogas, which is produced at their sewage treatment works in Sheffield.

BBC: 'Poo-powered' vans up and running in Sheffield