| 摘要: | The objective of this research work was to evaluate the performance of enhanced coagulation by alum and polymer. Synthetic source waters containing high molecular weight humic acids, medium molecular weight tannic acids and low molecular weight p-hydroxybenzoic acid were formulated by adjusting the concentration of turbidity and pH; and jar tests were used to study the effect of various types and dosages of polymer on reducing the above model compounds. At a specific pH condition, the applied alum dosage would efficiently decrease the turbidity to 2 NTU follows the order: humic>tannic>p-hydroxybenzoic acid. Adjustment of pH influenced the performance of alum obviously but not of p-DADMAC. High p-DADMAC dosage overwhelming the effects of alum is less affected by pH adjustment. The results of this investigation reveal that enhanced coagulation with p-DADMAC was founded to be very effective for removing high-molecular-weight THM precursors, i.e., humic acid and tannic acid, and markedly reduced the alum dosages required for turbidity removal. The other two polymers, i.e., cationic PAM and non-ionic PAM, which had higher molecular weight but lower charge density than p-DADMAC, were not capable of removing organic precursors. It was thus concluded that enhanced coagulation with polymer, p-DADMAC, could be considered as a promising technique for removal of NOMs with hydrophobic and higher-molar-mass (>1K) in water treatment plants.
PMID: 15664622 [PubMed - indexed for MEDLINE]
MeSH Terms, SubstancesMeSH Terms:Air PollutantsAlum Compounds/chemistry*ButterHumic SubstancesHydrogen-Ion ConcentrationModels, Theoretical*Parabens/chemistryPolyethylenes/chemistry*Quaternary Ammonium Compounds/chemistry*Tannins/chemistryWaste Disposal, FluidWater Pollutants/isolation & purification*Water Purification/methods*Substances:Air PollutantsAlum CompoundsHumic SubstancesParabensPolyethylenesQuaternary Ammonium CompoundsTanninsWater Pollutantsaluminum sulfatepoly-N,N-dimethyl-N,N-diallylammonium chlorideButter4-hydroxybenzoic acid
LinkOut - more resourcesFull Text Sources:Elsevier ScienceEBSCOOhioLINK Electronic Journal CenterSwets Information ServicesMolecular Biology Databases:ALUM, POTASSIUM - HSDBALUMINUM SULFATE - HSDBSupplemental Content
Related citations
Removal of THM precursors by coagulation or ion exchange. [Water Res. 2002]
Removal of THM precursors by coagulation or ion exchange.
Bolto B, Dixon D, Eldridge R, King S.
Water Res. 2002 Dec; 36(20):5066-73. Dissolved organic nitrogen removal during water treatment by aluminum sulfate and cationic polymer coagulation. [Water Res. 2006]
Dissolved organic nitrogen removal during water treatment by aluminum sulfate and cationic polymer coagulation.
Lee W, Westerhoff P.
Water Res. 2006 Dec; 40(20):3767-74. Epub 2006 Oct 4.Removal of dissolved natural organic matter from source water with alum coagulation. [Environ Technol. 2002]
Removal of dissolved natural organic matter from source water with alum coagulation.
Wang CS, Kang SF, Yang HJ, Pa SY, Chen HW.
Environ Technol. 2002 Dec; 23(12):1415-23. Coagulation/flocculation of dye-containing solutions using polyaluminium chloride and alum. [Water Sci Technol. 2009]
Coagulation/flocculation of dye-containing solutions using polyaluminium chloride and alum.
Zonoozi MH, Moghaddam MR, Arami M.
Water Sci Technol. 2009; 59(7):1343-51. Removal of pharmaceuticals in drinking water treatment: effect of chemical coagulation. [Environ Technol. 2006]
Removal of pharmaceuticals in drinking water treatment: effect of chemical coagulation.
Vieno N, Tuhkanen T, Kronberg L.
Environ Technol. 2006 Feb; 27(2):183-92. See reviews...
See all...
All links from this record
Related Citations
Calculated set of PubMed citations closely related to the selected article(s) retrieved using a word weight algorithm. Related articles are displayed in ranked order from most to least relevant, with the “linked from” citation displayed first. |
