aluminum recovery from water treatment sludges in netherlands

aluminum recovery from water treatment sludges in netherlands
Tags: , , , , , , , , ,
  • What is alum sludge?
  • As aluminium coagulants are the most common metallic coagulants which are used in water and wastewater treatment, alum sludge is a common name for water treatment sludge in many studies. Besides, some studies used other terms such as water treatment residual, alum residual, water treatment solid, waterworks sludge, waterworks residuals.
  • Can sulphuric acid recover aluminium from water treatment sludge?
  • Predicted and Observed Aluminium Recovery at Optimum Leaching Condition. Aluminium recovery of 61–99% from water treatment sludge has been reported using leaching process with sulphuric acid ( Jung et al., 2016; Nair and Ahammed, 2017 ).
  • How to recover aluminum from water treatment sludge?
  • Combined thermal (calcination, drying) and chemical extraction methods were developed to recover aluminum from water treatment sludge. Both alkali and acid extraction achieved high aluminum recovery (over 90%) from all types of AS. Acid extracted more undesirable elements and pollutants along with aluminum than alkali extraction.
  • How much aluminium can be recovered from treatment sludge?
  • According to literature, recovery of aluminium from treatment sludge using acid leaching process can range between 40 and 100% ( Kyncl, 2008; Xu et al., 2009b; Chen et al., 2012 ).