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Ferric chloride plus GAC for removing TOC
Author(s) -
Nowack Kirk O.,
Can Fred S.,
Arora Harish
Publication year - 1999
Publication title -
journal ‐ american water works association
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.466
H-Index - 74
eISSN - 1551-8833
pISSN - 0003-150X
DOI - 10.1002/j.1551-8833.1999.tb08586.x
Subject(s) - ferric , chemistry , chloride , total organic carbon , turbidity , activated carbon , environmental chemistry , water treatment , coagulation , organic matter , rendering (computer graphics) , pulp and paper industry , nuclear chemistry , inorganic chemistry , adsorption , environmental engineering , organic chemistry , environmental science , geology , psychology , computer graphics (images) , computer science , engineering , oceanography , psychiatry
Ferric chloride extends GAC bed life and prevents calcium buildup. Granular activated carbon (GAC) treatment is one method that water utilities can use to increase removal of natural organic matter and comply with the recently promulgated Disinfectants/ Disinfection By‐products Rule. The cost of GAC depends on its useful service life and its capacity for reuse. The research reported here used minicolumns to investigate how ferric chloride coagulation influenced the total organic carbon (TOC) subsequently removed by GAC. Ferric chloride pretreatment lengthened GAC bed life by lowering influent TOC and by rendering the TOC that remained more adsorbable. Jar tests showed that at pH < 6.0, ferric chloride was superior to aluminum salts, on an equimolar basis, for removing TOC.