Pozzolanic filtration/solidification of radionuclides in nuclear reactor cooling water

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Laboratory studies to investigate the feasibility of one- and two-step processes for precipitating/coprecipitating radionuclides from nuclear reactor cooling water, filtering with pozzolanic filter aid, and solidifying, are reported in this paper. In the one-step process, ferrocyanide salt and excess lime are added ahead of the filter, and the resulting filter cake solidifies by a pozzolanic reaction. The two-step process involves addition of solidifying agents subsequent to filtration. It was found that high surface area diatomaceous synthetic calcium silicate powders, sold commercially as functional fillers and carriers, adsorb nickel isotopes from solution at neutral and slightly basic pH. Addition of the silicates to cooling water allowed removal of the tested metal isotopes (nickel, iron, manganese, cobalt, and cesium) simultaneously at neutral to slightly basic pH. Lime to diatomite ratio was the most influential characteristic of composition on final strength tested, with higher lime ratios giving higher strength. Diatomaceous earth filter aids manufactured without sodium fluxes exhibited higher pozzolanic activity. Pozzolanic filter cake solidified with sodium silicate and a ratio of 0.45 parts lime to 1 part diatomite had compressive strength ranging from 470 to 595 psi at a 90% confidence level. Leachability indices of all tested metals in the solidified waste were acceptable. In light of the typical requirement of removing iron and desirability of control over process pH, a two-step process involving addition of Portland cement to the filter cake may be most generally applicable.

Original languageEnglish
Pages (from-to)585-592
Number of pages8
JournalWaste Management
Volume15
Issue number8
DOIs
StatePublished - Dec 1 1995

Fingerprint

cooling water
Cooling water
solidification
Nuclear reactors
Radioisotopes
Lime
diatomite
lime
Solidification
radionuclide
silicate
filter
Isotopes
Silicates
nickel
Nickel
Sodium
sodium
isotope
Iron

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • Management, Monitoring, Policy and Law
  • Pollution
  • Waste Management and Disposal
  • Environmental Science(all)
  • Earth and Planetary Sciences(all)

Cite this

Pozzolanic filtration/solidification of radionuclides in nuclear reactor cooling water. / Englehardt, James Douglas; Peng, Chengjun.

In: Waste Management, Vol. 15, No. 8, 01.12.1995, p. 585-592.

Research output: Contribution to journalArticle

@article{ef726576abab41a99e6b52ebeb33d1ce,
title = "Pozzolanic filtration/solidification of radionuclides in nuclear reactor cooling water",
abstract = "Laboratory studies to investigate the feasibility of one- and two-step processes for precipitating/coprecipitating radionuclides from nuclear reactor cooling water, filtering with pozzolanic filter aid, and solidifying, are reported in this paper. In the one-step process, ferrocyanide salt and excess lime are added ahead of the filter, and the resulting filter cake solidifies by a pozzolanic reaction. The two-step process involves addition of solidifying agents subsequent to filtration. It was found that high surface area diatomaceous synthetic calcium silicate powders, sold commercially as functional fillers and carriers, adsorb nickel isotopes from solution at neutral and slightly basic pH. Addition of the silicates to cooling water allowed removal of the tested metal isotopes (nickel, iron, manganese, cobalt, and cesium) simultaneously at neutral to slightly basic pH. Lime to diatomite ratio was the most influential characteristic of composition on final strength tested, with higher lime ratios giving higher strength. Diatomaceous earth filter aids manufactured without sodium fluxes exhibited higher pozzolanic activity. Pozzolanic filter cake solidified with sodium silicate and a ratio of 0.45 parts lime to 1 part diatomite had compressive strength ranging from 470 to 595 psi at a 90{\%} confidence level. Leachability indices of all tested metals in the solidified waste were acceptable. In light of the typical requirement of removing iron and desirability of control over process pH, a two-step process involving addition of Portland cement to the filter cake may be most generally applicable.",
author = "Englehardt, {James Douglas} and Chengjun Peng",
year = "1995",
month = "12",
day = "1",
doi = "10.1016/0956-053X(96)00015-3",
language = "English",
volume = "15",
pages = "585--592",
journal = "Waste Management",
issn = "0956-053X",
publisher = "Elsevier Limited",
number = "8",

}

TY - JOUR

T1 - Pozzolanic filtration/solidification of radionuclides in nuclear reactor cooling water

AU - Englehardt, James Douglas

AU - Peng, Chengjun

PY - 1995/12/1

Y1 - 1995/12/1

N2 - Laboratory studies to investigate the feasibility of one- and two-step processes for precipitating/coprecipitating radionuclides from nuclear reactor cooling water, filtering with pozzolanic filter aid, and solidifying, are reported in this paper. In the one-step process, ferrocyanide salt and excess lime are added ahead of the filter, and the resulting filter cake solidifies by a pozzolanic reaction. The two-step process involves addition of solidifying agents subsequent to filtration. It was found that high surface area diatomaceous synthetic calcium silicate powders, sold commercially as functional fillers and carriers, adsorb nickel isotopes from solution at neutral and slightly basic pH. Addition of the silicates to cooling water allowed removal of the tested metal isotopes (nickel, iron, manganese, cobalt, and cesium) simultaneously at neutral to slightly basic pH. Lime to diatomite ratio was the most influential characteristic of composition on final strength tested, with higher lime ratios giving higher strength. Diatomaceous earth filter aids manufactured without sodium fluxes exhibited higher pozzolanic activity. Pozzolanic filter cake solidified with sodium silicate and a ratio of 0.45 parts lime to 1 part diatomite had compressive strength ranging from 470 to 595 psi at a 90% confidence level. Leachability indices of all tested metals in the solidified waste were acceptable. In light of the typical requirement of removing iron and desirability of control over process pH, a two-step process involving addition of Portland cement to the filter cake may be most generally applicable.

AB - Laboratory studies to investigate the feasibility of one- and two-step processes for precipitating/coprecipitating radionuclides from nuclear reactor cooling water, filtering with pozzolanic filter aid, and solidifying, are reported in this paper. In the one-step process, ferrocyanide salt and excess lime are added ahead of the filter, and the resulting filter cake solidifies by a pozzolanic reaction. The two-step process involves addition of solidifying agents subsequent to filtration. It was found that high surface area diatomaceous synthetic calcium silicate powders, sold commercially as functional fillers and carriers, adsorb nickel isotopes from solution at neutral and slightly basic pH. Addition of the silicates to cooling water allowed removal of the tested metal isotopes (nickel, iron, manganese, cobalt, and cesium) simultaneously at neutral to slightly basic pH. Lime to diatomite ratio was the most influential characteristic of composition on final strength tested, with higher lime ratios giving higher strength. Diatomaceous earth filter aids manufactured without sodium fluxes exhibited higher pozzolanic activity. Pozzolanic filter cake solidified with sodium silicate and a ratio of 0.45 parts lime to 1 part diatomite had compressive strength ranging from 470 to 595 psi at a 90% confidence level. Leachability indices of all tested metals in the solidified waste were acceptable. In light of the typical requirement of removing iron and desirability of control over process pH, a two-step process involving addition of Portland cement to the filter cake may be most generally applicable.

UR - http://www.scopus.com/inward/record.url?scp=0029431813&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0029431813&partnerID=8YFLogxK

U2 - 10.1016/0956-053X(96)00015-3

DO - 10.1016/0956-053X(96)00015-3

M3 - Article

AN - SCOPUS:0029431813

VL - 15

SP - 585

EP - 592

JO - Waste Management

JF - Waste Management

SN - 0956-053X

IS - 8

ER -