The aimofthepresentstudywastodeviseandvalidateanappropriatetreatmentprocessfordisposalof
hazardous bariumandcyanidewasteintoalandfill ataCommonHazardousWasteTreatmentStorage
DisposalFacility(CHWTSDF).Thewastewasgeneratedduringtheprocessofhardeningofsteel
componentsandcontainscyanide(reactive)andbarium(toxic)asmajorcontaminants.Inthepresent
study chemical fixationofthecontaminantswascarriedout.Thecyanidewastreatedbyalkalichlori-
nation withcalciumhypochloriteandbariumbyprecipitationwithsodiumsulfateasbariumsulfate.The
pretreatedmixturewasthensolidified andstabilizedbybindingwithacombinationofslagcement,
ordinary Portlandcementand fly ash,moldedintoblocks(5 5 5 cm)andcuredforaperiodof3,7
and 28days.The final experimentswereconductedwith18recipemixturesofwaste þ additive:binder
(W:B)ratios.TheW:Bratiosweretakenas80:20,70:30and50:50.Theoptimumproportionsofadditives
and binderswere finalized onthebasisofthecriteriaofunconfined compressivestrengthandleach-
ability.TheleachabilitystudieswereconductedusingtheToxicityCharacteristicLeachingProcedure.The
blocks wereanalyzedforvariousphysicalandleachablechemicalparametersattheendofeachcuring
period.Basedontheresultsoftheanalysis,tworecipemixtures,withcompositions e 50% of
[waste þ (120gCa(OCl)2 þ 290 gNa2SO4) kg1 of waste] þ 50% ofbinders,werevalidatedfor in situ
stabilizationintoasecuredlandfill ofCHWTSDF.
การ aimofthepresentstudywastodeviseandvalidateanappropriatetreatmentprocessfordisposalof
อันตราย bariumandcyanidewasteintoalandfill atacommonhazardouswastetreatmentstorage
disposalfacility ( chwtsdf ) thewastewasgeneratedduringtheprocessofhardeningofsteel
componentsandcontainscyanide ( Reactive ) andbarium ( พิษ ) asmajorcontaminants . inthepresent
เรียนเคมี fixationofthecontaminantswascarriedout .thecyanidewastreatedbyalkalichlori -
ประเทศ withcalciumhypochloriteandbariumbyprecipitationwithsodiumsulfateasbariumsulfate .
portlandcementand ธรรมดา andstabilizedbybindingwithacombinationofslagcement pretreatedmixturewasthensolidified , เถ้าลอย moldedintoblocks ( 5 5 5 ซม. ) และ andcuredforaperiodof3,7
28days . สุดท้าย experimentswereconductedwith18recipemixturesofwaste þสารประสาน ( W :
:ข ) อัตราส่วน ทิว : bratiosweretakenas80:20,70:30and50:50 . theoptimumproportionsofadditives
-
binderswere สรุปและ onthebasisofthecriteriaofunconfined compressivestrengthandleach ความสามารถ theleachabilitystudieswereconductedusingthetoxicitycharacteristicleachingprocedure .
period.basedontheresultsoftheanalysis บล็อก wereanalyzedforvariousphysicalandleachablechemicalparametersattheendofeachcuring ,tworecipemixtures withcompositions E , 50% ของ
[ เสียþ ( 120gca ( OCL ) 2 þ 290 gna2so4 ) กก 1 ของเสีย ] þ 50% ofbinders werevalidatedfor ใน situ ,
stabilizationintoasecuredlandfill ofchwtsdf .
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