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Agricultural Development and Environmental Research American and Czechoslovak Perspectives: Proceedings of a Bilateral Workshop (1987) / Chapter Skim
Currently Skimming:

'SLUDGE THICKENING: A BIOTECHNOLOGICAL APPROACH'
Pages 207-212

The Chapter Skim interface presents what we've algorithmically identified as the most significant single chunk of text within every page in the chapter.
Select key terms on the right to highlight them within pages of the chapter.


From page 207...
... The activated sludge process is frequently chosen as the secondary treatment process because of the high BOD reductions usually achieved, and in many countries it is the most commonly used method for biological treatment of wastewater. In order to maintain optimum process conditions, waste impurities that are converted into new biomass (activated sludge)
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From page 208...
... In dissimilatory denitrification, nitrate serves as the hydrogen acceptor in the oxidation reduction reactions of the carbon substrate to provide energy for cell growth. It is converted to gaseous end products -- principally nitrogen -- by heterotrophic bacteria.
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From page 209...
... The operation parameters of the flotation unit were as follows: The mean flow of the waste-activated sludge into the bioflotation pilot plant was 5.19 ms/h. Concentration of total suspended solids was 2.96 g/L, and the hydraulic retention time 1.41 h.
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From page 210...
... TABLE 2 Results of bioflotation pilot plant operation with reaction tank Influent Thickened Effluent (Waste-activated sludge (sludge sludge liquor) Reduction Suspended solids (g/1)
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From page 211...
... All bioflocculation and bioflotation reactions took place in the flotation reactor. The hydraulic retention time in the flotation tank was prolonged to two hours, a period sufficient for satisfactory sludge thickening.
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From page 212...
... Longer hydraulic retention time helps attain a higher total suspended solids concentration in thickened sludges. In this case investment costs are much lower.
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Key Terms

  • pilot plant
  • retention time
  • hydraulic retention
  • suspended solids
  • sludge liquor

  • bioflotation pilot
  • flotation tank
  • sludge thickening
  • bioflotation process
  • total suspended

  • thickened sludge
  • sludge process
  • flotation unit
  • treatment plants
  • plant operation

  • solids concentration
  • waste activated
  • dissimilatory denitrification
  • tank influent
  • energy consumption

  • thickened effluent
  • diagrammatic layout
  • calcium nitrate
  • wastewater treatment
  • low energy

  • biological treatment
  • reaction tank
  • gravity thickeners
  • plants employ
  • organic substances


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