%0 Journal Article %1 rott2017removal %A Rott, Eduard %A Minke, Ralf %A Steinmetz, Heidrun %D 2017 %I Elsevier %J Journal of water process engineering %K sent ubs_10002 ubs_20002 ubs_30026 ubs_40034 unibibliografie %P 188-196 %R 10.1016/j.jwpe.2017.04.008 %T Removal of phosphorus from phosphonate-loaded industrial wastewaters via precipitation/flocculation %V 17 %X Phosphonates are to be removed from industrial wastewater before they reach municipal wastewater treatment plants or surface waters. Industrial wastewaters contaminated with the phosphonates 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTC), 1-hydroxyethylidene-(1,1-diphosphonic acid) (HEDP), nitrilotrimethylphosphonic acid (NTMP), ethylenediamine tetra(methylene phosphonic acid) (EDTMP) and diethylenetriamine penta(methylene phosphonic acid) (DTPMP) can be subdivided into: (1) mostly clear concentrates with a high water hardness, and (2) organically polluted wastewaters, for instance from the paper and textile industries. Our own flocculation experiments with FeIII and AlIII salts showed that, at a pH of 7.5, the adsorption affinity of polyphosphonates onto iron hydroxides and aluminum hydroxides significantly decreases with an increasing number of C-P bonds (HEDP > NTMP > EDTMP > DTPMP). In comparison to pure water spiked with phosphonates, the total P removal from concentrates occurred at similar and even lower flocculant dosage concentrations (ß = 4-8) (ß is the molar ratio of dosed metal concentration to total P concentration in the raw sample). In organically polluted industrial wastewaters, the formation of flocks, and therefore the total P decrease, only occurred after exceeding a certain flocculant concentration, which varied strongly depending on the wastewater type (ß = 0.6-86). Below that concentration, the flocculant underwent complexation, and no elimination could be observed. For most of the wastewaters, the required ß values for at least 80% total P decrease were very similar for both FeIII and AlIII. Furthermore, Ca(OH)2 as flocculant turned out to be an effective tool for total P removal and simultaneous softening of calcareous concentrates.

@article{rott2017removal, abstract = {Phosphonates are to be removed from industrial wastewater before they reach municipal wastewater treatment plants or surface waters. Industrial wastewaters contaminated with the phosphonates 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTC), 1-hydroxyethylidene-(1,1-diphosphonic acid) (HEDP), nitrilotrimethylphosphonic acid (NTMP), ethylenediamine tetra(methylene phosphonic acid) (EDTMP) and diethylenetriamine penta(methylene phosphonic acid) (DTPMP) can be subdivided into: (1) mostly clear concentrates with a high water hardness, and (2) organically polluted wastewaters, for instance from the paper and textile industries. Our own flocculation experiments with FeIII and AlIII salts showed that, at a pH of 7.5, the adsorption affinity of polyphosphonates onto iron hydroxides and aluminum hydroxides significantly decreases with an increasing number of C-P bonds (HEDP > NTMP > EDTMP > DTPMP). In comparison to pure water spiked with phosphonates, the total P removal from concentrates occurred at similar and even lower flocculant dosage concentrations (ß = 4-8) (ß is the molar ratio of dosed metal concentration to total P concentration in the raw sample). In organically polluted industrial wastewaters, the formation of flocks, and therefore the total P decrease, only occurred after exceeding a certain flocculant concentration, which varied strongly depending on the wastewater type (ß = 0.6-86). Below that concentration, the flocculant underwent complexation, and no elimination could be observed. For most of the wastewaters, the required ß values for at least 80% total P decrease were very similar for both FeIII and AlIII. Furthermore, Ca(OH)2 as flocculant turned out to be an effective tool for total P removal and simultaneous softening of calcareous concentrates.}, added-at = {2020-08-11T11:19:35.000+0200}, author = {Rott, Eduard and Minke, Ralf and Steinmetz, Heidrun}, biburl = {https://puma.ub.uni-stuttgart.de/bibtex/23da30864d0747954c192b6c56fceb755/unibiblio}, doi = {10.1016/j.jwpe.2017.04.008}, interhash = {1aefea5aa8f21edbd2c469580441254c}, intrahash = {3da30864d0747954c192b6c56fceb755}, issn = {2214-7144}, journal = {Journal of water process engineering}, keywords = {sent ubs_10002 ubs_20002 ubs_30026 ubs_40034 unibibliografie}, language = {eng}, pages = {188-196}, publisher = {Elsevier}, timestamp = {2020-08-11T09:19:35.000+0200}, title = {Removal of phosphorus from phosphonate-loaded industrial wastewaters via precipitation/flocculation}, volume = 17, year = 2017 }