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• W775684421 abstract "Nutrients discharge into receiving waters can cause an environmental problem capable ofdeathly altering ecosystems. Natural zeolites are low cost resources with ion exchangecapacity that have been widely studied. This study deals with simultaneous adsorption ofnutrients; viz. ammonium and phosphate, onto different modifications of natural zeolite,clinoptilolite. Research has been focused on the optimization of surface modificationprocedures to raise clinoptilolite efficiency and to enhance the capability of regeneration.Four columns were filled with approximate 12 grams of zeolitic material; namely, natural nontreated(Z-N), manganese-modified (Z-Mn), iron-modified (Z-Fe) and aluminium-modified (ZAl)clinoptilolite. During three cycles, both adsorption and removal rate were investigated toevaluate clinoptilolite capacity loss.��� For adsorption studies influent was synthetic wastewater (4 L of loading solutioncontaining 100 and 10 ppm of NH4+ and PO43-, respectively).��� For desorption studies influent was basic solution (1 L of 0,05 M of NaOH).On one hand, ammonium analyses reported similar results for each tested zeolite. Inorganicsalt modification seemed not to increase clinoptilolite ammonium adsorption capacity.Generally, it was high during the first run. However, better ammonium removal from theinfluent was observed after column regeneration. Basic treatment probably activated thezeolite; thus enhancing first run results. Capacity results were in range of 9,0-16,0 mg NH4-N/g of zeolite. Highest ammonium removal was reported of 0,2 g.On the other hand, phosphate analyses reported different results for each tested zeolite.Inorganic salt modification increased clinoptilolite phosphate adsorption capacity since naturalclinoptilolite possess barely any selectivity towards phosphate ion. In general, phosphateadsorption was low, achieving a maximum removal of 10,1 mg adsorbed by Al-modifiedclinoptilolite. Two different mechanisms might rule over phosphate removal. Adsorption ontothe zeolite framework was observed before basic treatment; and after, partial precipitation.This theory is buttress with low percentage of phosphate recovery during the regeneration,especially in Z-Al experiments. In 3rd cycle regeneration analyses, phosphate recoverypercentage was 55%, 79% and 33% for the Mn-modified, Fe-modified, and Al-modifiedclinoptilolite.Global tendency is to guarantee water resources for supply and quality of water within aquaticsystems. The proposed cost-effective technique promotes the recovery of nutrients, thusobtaining a potential fertilizer application very attractive to investors and stakeholders." @default.
• W775684421 created "2016-06-24" @default.
• W775684421 creator A5069964298 @default.
• W775684421 date "2015-01-01" @default.
• W775684421 modified "2023-09-23" @default.
• W775684421 title "Simultaneous ammonium and phosphate removal by metal inorganic salt modification of natural zeolite" @default.
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• W775684421 hasPublicationYear "2015" @default.
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