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Pore Solution Chemistry of Simulated Low Level Liquid Waste Incorporated Cement Grouts

  • Sadananda Sahu (a1) and Sidney Diamond (a1)

Abstract

Expressed pore solutions from simulated low level liquid waste cement grouts cured at room temperature, 50°C and 90°C for various duration were analyzed by standard chemical methods and ion chromatography. The solid portions of the grouts were formulated with portland cement, fly ash, slag, and attapulgite clay in the ratios of 3:3:3:1. Two different solutions simulating off-gas condensates expected from vitrification of Hanford low level tank wastes were made. One is highly alkaline and contains the species Na+, PO4 3-, NO2 -, NO3 - and OH-. The other is carbonated and contains the species Na+, PO4 3-, NO2 - NO3 - and CO3 2- In both cases phosphate rapidly disappeared from the pore solution, leaving behind sodium in the form of hydroxide. The carbonates were also removed from the pore solution to form calcium carbonate and possibly calcium monocarboaluminate. These reactions resulted in the increase of hydroxide ion concentration in the early period. Subsequently there was a significant reduction OH- and Na+ ion concentrations. In contrast high concentration of NO2 - and NO3 - were retained in the pore solution indefinitely.

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Pore Solution Chemistry of Simulated Low Level Liquid Waste Incorporated Cement Grouts

  • Sadananda Sahu (a1) and Sidney Diamond (a1)

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