More commonly with domestic sewage, the fresh sludge is continuously extracted from the tank mechanically and passed to separate sludge digestion tanks that operate at higher temperatures than the lower story of the Imhoff tank and, as a result, digest much more rapidly and efficiently.
32.
Aside from oil spills, trace metals such as copper, cadmium and zinc at the surface of the water were found at the bay coming from sea-based and land-based ( e . g ., domestic sewage, industrial effluents, runoff, combustion emissions, and mining operations ) sources.
33.
Description of " biosolids " in conformance with local regulations may reduce confusion; but some use an expanded definition including any solids, slime solids or liquid slurry residue generated during the treatment of domestic sewage including scum and solids removed during primary, secondary or advanced treatment processes.
34.
For decades, industrial effluents from the leather factories here, including toxic heavy metals such as chrome, and millions of gallons of untreated domestic sewage have spewed into the Ganges from hundreds of cities, towns and villages along the river's 1, 560-mile journey through the sprawling northern Indian plains.
35.
The Secretary, through the Fish and Wildlife Service and the U . S . Bureau of Mines, is further authorized to make investigations to determine the effects of domestic sewage, mine, petroleum, and industrial wastes, erosion silt, and other polluting substances on wildlife, and to make reports and recommendations to Congress.
36.
They identified 44 small sewage treatment plants, none of which treated the sewage adequately, and noted that the river was " much polluted by domestic sewage and by untreated or partially treated trade refuse . " By the early 1900s, the river was lifeless between Barnsley and the Don, with fish unable to survive in the cocktail of chemicals.
