Removal of phosphate from sewage as amorphous calcium phosphate

摘要

This paper discusses the progress of laboratory scale and a larger pilot plant campaign directed at evaluating a new process for the removal and recovery of phosphate from municipal sewage (after secondary treatment) and certain industrial waste streams. The laboratory scale experiments (conducted at flow rates up to 75 1 hr) on real sewage (total P around 10 mg 1~-1) and on a variety of simulated industrial and sewage streams (total P up to 160 mg 1~-1) were very successful in removing phosphorus to >98/100, and produced a phosphate containing 'product" containing up to 18/100 elemental P (i. e. around 80/100 Ca_3(PO_4)_2), and some of these laboratory scale tests are described in detail.