Assessment of zeolite and compost-zeolite mixture as permeable reactive materials for the removal of lead from a model acidic groundwater
Franklin Obiri-Nyarko , Jolanta Kwiatkowska-Malina , Grzegorz Malina , Krzysztof Wołowiec
AbstractColumn experiments were performed to assess the effectiveness of zeolite and compost-zeolite mixture in removing dissolved lead (Pb2+) from acidic water of pH 2.4. The acid neutralizing ability and hydraulic performance of the materials were also studied. Fitting the advection-dispersion equation (ADE) and mathematical models (i.e. the Dose-Response, Adams-Bohart, and Yoon-Nelson models) to the Pb2+ experimental breakthrough curves (BTCs) was also performed. The compost-zeolite mixture proved to be better than zeolite alone both: in removing Pb2+ and in buffering the acidic pH. The maximum adsorption capacity, qo obtained for zeolite was 0.097 mg/g and 0.151 mg/g for the compost-zeolite mixture, respectively. Lead removal was attributed to ion exchange and adsorption. Observed Pb2+ BTCs demonstrated sorption-related nonequilibrium effects in the columns. The hydraulic conductivity of zeolite decreased by 2% and by 28.8% in the case of compost-zeolite mixture at the end of the experiment. The entire experimental BTC of Pb2+ was well described by the Dose-Response model while the Adams-Bohart model was better in describing only the initial part of the lead BTCs.
|Journal series||Journal of Contaminant Hydrology, ISSN 0169-7722, e-ISSN 1873-6009|
|Publication size in sheets||0.3|
|Keywords in English||Permeable reactive barriersZeoliteCompostLeadModellingAcidic groundwater|
|Score||= 100.0, 16-07-2020, ArticleFromJournal|
|Publication indicators||= 0; = 0; : 2018 = 1.313; : 2018 = 2.65 (2) - 2018=2.68 (5)|
|Citation count*||1 (2020-09-08)|
* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.