TY - JOUR
T1 - Feasibility and kinetics study on the direct bio-regeneration of perchlorate laden anion-exchange resin
AU - Wang, Chao
AU - Lippincott, Lee
AU - Meng, Xiaoguang
PY - 2008/11
Y1 - 2008/11
N2 - Anion exchange is one of the most promising treatment technologies for the removal of low levels of perchlorate. The spent anion-exchange resins, however, need to be disposed of or regenerated because they contain high contents of perchlorate. This study investigated the feasibility and kinetics of a direct bio-regeneration method. The method accomplished resin regeneration and biological perchlorate destruction concurrently, by directly contacting the spent resin with the perchlorate-reducing bacteria (PRB). The results indicated that the method was effective in regeneration of perchlorate and nitrate loaded resin and the resin could be repeatedly regenerated with the method. The regenerated resin was effective, stable, and durable in the filtration treatment of perchlorate in well water from the Saddle River area, NJ. Moreover, the method was also effective in regeneration of the spent A-530E resin, which had high perchlorate affinity and was yet very difficult for regeneration with the conventional brine desorption technique. Besides, the results further suggested that the perchlorate and nitrate desorption from the loaded resin coupling with their subsequent biological reduction could be the direct bio-regeneration mechanism. No biofilm was formed on the regenerated resin surface according to a scanning electron microscopy (SEM) analysis.
AB - Anion exchange is one of the most promising treatment technologies for the removal of low levels of perchlorate. The spent anion-exchange resins, however, need to be disposed of or regenerated because they contain high contents of perchlorate. This study investigated the feasibility and kinetics of a direct bio-regeneration method. The method accomplished resin regeneration and biological perchlorate destruction concurrently, by directly contacting the spent resin with the perchlorate-reducing bacteria (PRB). The results indicated that the method was effective in regeneration of perchlorate and nitrate loaded resin and the resin could be repeatedly regenerated with the method. The regenerated resin was effective, stable, and durable in the filtration treatment of perchlorate in well water from the Saddle River area, NJ. Moreover, the method was also effective in regeneration of the spent A-530E resin, which had high perchlorate affinity and was yet very difficult for regeneration with the conventional brine desorption technique. Besides, the results further suggested that the perchlorate and nitrate desorption from the loaded resin coupling with their subsequent biological reduction could be the direct bio-regeneration mechanism. No biofilm was formed on the regenerated resin surface according to a scanning electron microscopy (SEM) analysis.
KW - Anion-exchange resin
KW - Groundwater
KW - Perchlorate
KW - Regeneration
KW - SEM
UR - http://www.scopus.com/inward/record.url?scp=54249088348&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=54249088348&partnerID=8YFLogxK
U2 - 10.1016/j.watres.2008.08.013
DO - 10.1016/j.watres.2008.08.013
M3 - Article
C2 - 18786692
AN - SCOPUS:54249088348
SN - 0043-1354
VL - 42
SP - 4619
EP - 4628
JO - Water Research
JF - Water Research
IS - 18
ER -