flocn.
/flɒk/, U.S. /flɑk/ A flocculent mass of fine particles and colloidal material.
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floc1921
1921 H. P. Eddy in Jrnl. Western Soc. Engin. XXVI. 259 When sewage containing a suitable supply of dissolved oxygen is agitated..the fine suspended matter and the colloidal substances here gather into small aggregations called flocculi or floc. [Note] The word ‘floc’ as used herein, signifies a single sponge-like mass or an aggregation of such masses.
1947 H. E. Babbitt Sewerage & Sewage Treatm. (ed. 6) xix. 396 As the floc settles through the liquid it sweeps other settleable particles down with it.
1959 J. Clegg Freshwater Life Brit. Isles (ed. 2) xix. 324 The flocs in the activated sludge system perform the same function of purification as the zooglea layer on the percolating filter.
This entry has not yet been fully updated (first published 1972; most recently modified version published online March 2022).
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n.1921