Characterization of anion diffusion in polymer hydrogels used for wastewater remediation
نویسندگان
چکیده
Ion exchange systems for the removal of nutrient pollutants, even at extremely low concentrations, from wastewater effluents are a major environmental need. This work reports on the features of batch sorption processes for the ultimate removal and recovery of reactive phosphorus, nitrogen, and sulfur anions from aquaculture production wastewater effluents. The sorbent used was a crosslinked polyamine (PAA$HCl) polymeric hydrogel. The PAA$HCl hydrogels were prepared by chemically crosslinking aqueous solutions of linear PAA$HCl chains with epichlorohydrin (EPI). The nutrient anion binding capacity of the gels was studied as a function of various processing parameters. Lab scale batch and experiments showed maximum anion removal, from aquaculture wastewater, with regard to PO 4 by 99%, NO K 3 by 70%, and SO 4 by 95%. PO 3K 4 diffusivities of 16, 10, and 8!10 K6 cm/s were measured at pH levels of 5.5, 7.0, and 8.5. q 2005 Elsevier Ltd. All rights reserved.
منابع مشابه
Characterization of network morphology in anion binding hydrogels used for wastewater remediation
This work reports on morphological features of hydrogels, which have been used for the ultimate removal and recovery of nutrient and toxic anions from wastewater effluents. The sorbent used was crosslinked polyamine (PAA$HCl) polymeric hydrogels. The surface topography and morphology of these hydrogels were characterized by tapping mode atomic force microscopy. The change of the gel surface in ...
متن کاملReactive nitrogen and phosphorus removal from aquaculture wastewater effluents using polymer hydrogels
We have developed poly(allyl amine hydrochloride) (PAA · HCl) polymer hydrogels, that efficiently remove nitrate (NO3 ), nitrite (NO2 ), and orthophosphate (PO4 ) nutrient anions from the aquaculture wastewater. The hydrogels were prepared by chemically crosslinking linear PAA · HCl chains with epichlorohydrin (EPI). The anion binding capacity of the pH sensitive polymer gels was measured in st...
متن کاملAmmonium Perchlorate–Binding Poly(allylamine hydrochloride) Hydrogels for Wastewater Remediation
Systems that are capable of removing highly toxic anions from wastewater effluents, even at extremely low concentrations, are a major need in the defense industry. This study reports on the features of two new batch and continuous-flow sorption processes with regard to ultimate removal and recovery of the perchlorate (ClO4 ) anion from ammonium perchlorate (NH4ClO4) wastewater. The sorbent deve...
متن کاملPhosphate binding polymeric hydrogels for aquaculture wastewater remediation
Methods that will remove conventional nutrient pollutants such as reactive phosphorus, even at extremely low concentrations, from wastewater effluents are a major need in the aquaculture industry. In this study, novel phosphate binding crosslinked poly(allylamine), PAA · HCl, polymeric hydrogel materials were developed, which efficiently bind phosphate anions in aquaculture wastewater effluents...
متن کاملSwelling Characterization of Nanocomposite Hydrogels of Poly (acrylamide-N-vinylimidazole)
In this study, a hydrogel composed of acrylamide (AAm) with N-vinylimidazole (NVI) as co-monomer, with a cross-linker such as N, N` Methylenebisacrylamide and potassium peroxodisulfate as an initiator solution was prepared. Poly (AAm/NVI) hydrogels were synthesized by free radical solution polymerization. Swelling experiments were performed in water at 25°C, gravimetrically. Here, it was of...
متن کامل