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2. Martin County water crisis - Wikipedia

   en.wikipedia.org/wiki/Martin_County_water_crisis

   The contamination can be traced back to an incident in October 2000. A local subsidiary of Massey Energy was mining coal in the area for energy production. The byproduct of the energy production process is a black sludge substance which contains high levels of arsenic, lead, mercury, and other industrial pollutants. [13]

3. Answer Man: 'Black gunk' in city water? Is Asheville water ...

   www.aol.com/news/answer-man-black-gunk-city...

   A reader asks about a black, ... and if city of Asheville water is safe to drink. Skip to main content . 24/7 Help. For premium support please call: 800-290-4726 more ways to ...

4. Letters warn some Tri-Citians of water pipes of ‘unknown ...

   www.aol.com/letters-warn-tri-citians-water...

   The use of lead has been banned in water systems since 1986, and most water pipes are now made of copper or plastic. Both Pasco and Richland public works departments have sent letters to residents.

5. Black sludge, invasive seaweed, toxic algae: Cape Cod pond ...

   www.aol.com/black-sludge-invasive-seaweed-toxic...

   This is the first year there was no increase in the number of embayments with "unacceptable" water quality, 43 out of 48, but the organization notes that it's the same 43 water bodies with ...

6. Sewage sludge treatment - Wikipedia

   en.wikipedia.org/wiki/Sewage_sludge_treatment

   Sludge is mostly water with some amounts of solid material removed from liquid sewage. Primary sludge includes settleable solids removed during primary treatment in primary clarifiers. Secondary sludge is sludge separated in secondary clarifiers that are used in secondary treatment bioreactors or processes using inorganic oxidizing agents.

7. Blackwater (coal) - Wikipedia

   en.wikipedia.org/wiki/Blackwater_(coal)

   Impoundments for storage of blackwater and other coal-related wastes have a troubled history with often severe environmental consequences. In February 1972, three dams holding a mixture of coal slurry in Logan County, West Virginia, failed in succession: 130,000,000 US gallons (490,000 m 3) of toxic water were released in the Buffalo Creek Flood.