Removal of radiocesium from low level radioactive effluents by hexacyanoferrate loaded synthetic zeolite: laboratory to pilot plant scale demonstration

Abstract

<jats:title>Abstract</jats:title><jats:p>Present paper reports removal of radiocesium from low level waste using a modified sorbent (13X-CFC) prepared by in-situ precipitation of potassium copper hexacyanoferrate(II) inside the macropores of a synthetic zeolite. The Cs exchange isotherm of the sorbent is established and it found to follow Fruendlich absorption isotherm equation. It is varified that presence of hexacyanoferrate on zeolite facilitates rapid Cs uptake performance. This is further confirmed in laboratory scale column tests, wherein excellent Cs removal performance from low level waste simulant was observed even at higher flow rates (40 bed volumes per hour). The utility of the sorbent is established through successful demonstration in a pilot scale (50 L) trial with almost complete removal of</jats:p>

Radioactive Wastewater Treatment Technologies: A Review

“…Therefore, natural inorganic materials are modified for radioactive wastewater treatment. Nerjee et al [ 35 ] prepared a hexacyanoferrate (II) adsorbent (13X-CFC) by modifying zeolite by an in situ precipitation method and used this adsorbent for pilot tests. Under the conditions of a 137 Cs concentration of 7 Bq·mL −1 and a flow rate of 0.3 Bq·mL −1 , the adsorbent was used for a pilot test, which can treat more than 14,000 wastewater per resin bed volume.…”

Dual Ion-Imprinted Mesoporous Silica for Selective Adsorption of U(VI) and Cs(I) through Multiple Interactions

“…Low-level radioactive effluents (LLRE) are one of the largest portions of nuclear waste . LLRE contains a variety of trace-level radionuclides, including uranium and cesium, as well as macro-level inactive salts like NaCl, Na 2 SO 4 , and so on. − Uranium, one of the main raw materials of the nuclear industry, has radioactivity and extremely strong chemical toxicity. In addition, 137 Cs is the fission product of 235 U and the major radionuclides in radioactive waste storage and has the characteristics of high toxicity, high solubility, and extremely active chemical properties. , Both of these can accumulate in the body through the food chain, causing serious health problems in the event of leakage. , Thus, it is strategically significant to separate U­(VI) and Cs­(I) from LLRE for sustainable development of nuclear industry and environment because of their simultaneous presence in LLRE.…”