Accession Number : ADA146177


Title :   Encapsulation/Fixation (E/F) Mechanisms.


Descriptive Note : Final rept. 30 Sep 82-30 Apr 84,


Corporate Author : S-CUBED LA JOLLA CA


Personal Author(s) : Mishuck,E ; Taylor,D R ; Telles,R ; Lubowitz,H


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a146177.pdf


Report Date : 18 Jun 1984


Pagination or Media Count : 255


Abstract : The objective of this project was to examine the chemical and/or physical bonds created in the process of encapsulating/fixing AAP-type sludges. Typical sludge compositions were selected for detailed study on review of sludges generated during wastewater treatment and related operations at 22 Army facilities. Candidate fixatives included polysilicates, amine-cured polyepoxides and polysulfides. A limited study was also conducted using ion-exchange resins of the non-ionic type for sludges containing TNT and rdx; and cationic exchangers with specific chemically reactive groups for sludges containing heavy metals. The measure of effectiveness of the AAP sludge-fixative combination was EPA's EP Toxicity Test. Instrumentation characterization methods included optical microscopy, infrared spectroscopy, scanning electron microscopy, energy-dispersive X-ray analysis, and X-ray diffraction. Polysilicates were found to fix heavy metals as a consequence of the highly alkaline-buffered media they provide. Nitrocellulose was observed to react with epoxy ingredients with the possible removal of nitrato groups. Studies with polysulfides and ion-exchange resins were encouraging, resulting in chemically fixed sludges of high contaminant density and resistance to leaching.


Descriptors :   *WASTE WATER , *ARMY FACILITIES , *WATER TREATMENT , *SLUDGE , CHEMICAL PROPERTIES , POLYMERS , CHEMICAL BONDS , CHEMICAL REACTIONS , ENCAPSULATION , POLYSULFIDES , RDX , TNT , SILICATES , HEAVY METALS


Subject Categories : Water Pollution and Control


Distribution Statement : APPROVED FOR PUBLIC RELEASE