sludge engineering: the treatment and disposal of wastewater
                                               
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  • What is sewage sludge?
  • Wastewater treatment - Sludge, Disposal, Treatment: The residue that accumulates in sewage treatment plants is called sludge (or biosolids). Sewage sludge is the solid, semisolid, or slurry residual material that is produced as a by-product of wastewater treatment processes. This residue is commonly classified as primary and secondary sludge.
  • Why is sewage sludge treated before disposal?
  • Quite often the sludges are combined together for further treatment and disposal. Treatment and disposal of sewage sludge are major factors in the design and operation of all wastewater treatment plants. Two basic goals of treating sludge before final disposal are to reduce its volume and to stabilize the organic materials.
  • Why is sludge research important?
  • As a byproduct of sewage treatment in wastewater treatment plants, sludge has dual attributes with pollution and resource, and its research is important to ecological environment and energy security. Therefore, it is of great significance to analyze and summarize the development of research in the field of sludge treatment and disposal.
  • Why is sewage sludge a major challenge to used water management?
  • The treatment and disposal of sewage sludge presents a major challenge to used water management because as already shown in the previous section, apart from screenings and grit, the main by-products of used water treatment in conventional facilities are primary and secondary sludge.