In the art world, it is fostered by an incessant rain of numbers in the media whenever an art star comes to its attention. Graffiti Artists Turn on Banksy: The Rise of Art Hate Anthony Haden-Guest August 6, 2014
For the music genre, see Sludge metal. Sludge. Sludge is a semi-solid slurry and can be produced as sewage sludge from wastewater treatment processes or as a settled suspension obtained from conventional drinking water treatment and numerous other industrial processes.
What is not removed by treatment or partitioned into the wastewater is found in sewage sludge. Sewage sludge is a heterogeneous mix of hazardous materials. The majority of sewage sludge produced in wastewater treatment plants in the United States is disposed of on land, primarily agricultural land. This highly controversial practice is supported by the federal government and regulated by the EPA.