Herbicide-Impacted Sediment Remediation. I: Delineation and Treatability Study

• Published in: Journal of hazardous, toxic and radioactive waste toxic and radioactive waste, 2016-04, Vol.20 (2)
• Main Authors: Grubb, Dennis G, Ziegelbauer, Heather L, Berggren, Dusty R. V, Danko, Jeffrey
• Format: Article
• Language: English
• Subjects: Technical Papers
• ISSN: 2153-5493; 2153-5515
• DOI: 10.1061/(ASCE)HZ.2153-5515.0000298

AbstractThis paper is the first in a series on the Tyco Fire Products LP Sediment Removal Project (Marinette, Wisconsin) describing the dredging, stabilization and solidification (S/S) treatment, and nonhazardous disposal of arsenic-impacted sediments. Arsenic (As) impacts were associated primarily with the release of monomethyl arsonic acid (MMA) [CH3AsO(OH)2] and dimethyl arsinic acid (DMA) [(CH3)2AsO(OH)] derived from historic herbicide manufacturing and storage activities. Two main sediment horizons were affected: an upper soft sediment [soft dredged material (DM)] and an underlying semiconsolidated material (SCM) layer. One soft DM surrogate had a total As content of 6,295  mg/kg; toxicity characteristic leaching procedure (TCLP) As of 34.6  mg/L, moisture contents (MCs) between 169 and 200%; and a loss on ignition of 15.4. Two types of SCMs were evaluated. One was a very sandy nonplastic sediment with a total As content of 1,066  mg/kg and TCLP As of 32  mg/L. The other was TCLP As compliant but was more water sensitive, with a total As content of 884  mg/kg and MC of 81%. A treatability study was conducted to determine the S/S treatments, using no more than two reagents simultaneously, that would yield a product meeting all disposal criteria (TCLP As