Open AccessStatus report on solid control in leachates
Author(s) -
E.C. Beahm,
C.F. Weber,
D.D. Lee,
T.A. Dillow,
Rodney D. Hunt,
C.M. Keswa,
K. OsseoAsare,
Katherine Spear
Publication year - 1998
Language(s) - English
Resource type - Reports
DOI - 10.2172/296612
Subject(s) - leaching (pedology) , dissolution , leachate , sodium hydroxide , chromium , hydroxide , chemistry , caustic (mathematics) , pulp and paper industry , waste management , aluminium hydroxide , aluminium , inorganic chemistry , environmental chemistry , environmental science , organic chemistry , engineering , physics , soil science , mathematical physics , soil water
Sludge pretreatment will involve some combination of washing and leaching with sodium hydroxide solutions to remove soluble salts and amphoteric material such as alumina. It is of paramount importance to prevent gelation and uncontrolled solid formation in tanks, transfer lines, and process equipment. An evaluation of results of washing and caustic leaching indicates that washing is more effective in dissolving sludge solids than subsequent sodium hydroxide treatment. Only aluminum and chromium were removed more effectively by caustic leaching than by water washing