02300nas a2200253   4500008004100000022001400041245010400055210006900159260007900228300001200307490000700319520138300326653001601709653001401725653001601739653001301755653002501768100002201793700003201815700002401847700002101871700002201892856013201914       2016                        eng d  a2194-574800aDifferentiating process performance of various coagulants in removal of congo red and orange G dyes0 aDifferentiating process performance of various coagulants in rem  aGENTHINER STRASSE 13, D-10785 BERLIN, GERMANYbWALTER DE GRUYTER GMBHcFEB  a195-2110 v143 a<p>Two refractory azo dyes-Congo red and Orange G, especially at high concentrations were subjected to coagulation with different conventional coagulants and newer formulations developed from Aluminum sulfate, Iron (III) chloride, Aluminium chloride, Poly diallydimethylammonium chloride (Poly DADMAC) and Poly Aluminium Chloride (PAC). The highest COD reduction of 99 % was obtained with PAC SAB 18 (Powder Grade PAC) for Congo red at pH 4.5 while the color removal of 99 % was achieved with almost all the coagulants in the present study at specific pH within 3-8. The optimum dose for the iron-based coagulant is 200 mg/L while that of aluminum-based coagulants and PAC is 150-200 mg/L. Results showed that Orange G was more difficult to remove with a maximum COD removal of 65 % and 35 % color removal using various formulations. The combinational formulations of inorganic-inorganic and inorganic- organic produced a substantial enhancement in COD and color removal and reduced sludge. PAC-Fe30/70 produces the minimum sludge of 50 mL/g on Congo red. pH in the range 3-9 showed high reductions in COD and color (90-99 %) for Congo red while jerky rise in COD and color reduction was observed in the case of Orange G after pH 9. An attempt to understand the dye coagulation mechanism has been made based on the specific difference in dye structure and cation speciation.</p>10acoagulation10aCongo red10adye removal10aOrange G10aWastewater treatment1 aPrajapati, Kavita1 aSorokhaibam, Laxmi, Gayatri1 aBhandari, Vinay, M.1 aKilledar, D., J.1 aRanade, Vivek, V.  uhttps://library.ncl.res.in/content/differentiating-process-performance-various-coagulants-removal-congo-red-and-orange-g-dyes-002328nas a2200253   4500008004100000022001400041245006700055210006700122260007100189300001400260490000600274520150100280653001601781653001601797653002301813653001701836653001401853100001701867700003201884700002401916700001301940700002201953856009901975       2016                        eng d  a2168-048500aGreen approach to dye wastewater treatment using biocoagulants0 aGreen approach to dye wastewater treatment using biocoagulants  a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcMAY  a2495-25070 v43 a<p>The present study focuses on newer biocoagulants, bioformulations, and the understanding of coagulant behavior with biocoagulants in relation to chemical coagulants. Newer biocoagulants, seeds of Azadirachta indica (AI) and pads of Acanthocereus tetragonus, are discussed along with two known biocoagulants, Moringa oleifera and Cicer arietinum seeds. Dye removal studies were carried out using widely reported Congo red dye to facilitate easy comparison with other conventional coagulants and the effect of various parameters such as initial dye concentration, pH, coagulant dose, etc. are discussed in detail. The use of biocoagulant was found to be highly effective, and up to 99% dye removal was achieved for coagulant doses in the range of 300-1500 mg/L. It was also observed that coagulation is pH sensitive, similar to chemical coagulants. Although the biocoagulant dose is relatively higher than the conventional chemical coagulants, a good value for the sludge volume index, similar to 50 mL/g for 1 h and 30 min, respectively, was obtained for the two coagulants, Acanthocereus tetragonus and Moringa oleifera. A very high particle count compared to chemical coagulants was observed using a focused beam reflectance measurement. Bioformulation with chemical coagulants such as alum, ferric, and aluminum based coagulants can, not only lower doses of biocoagulants (up to one-third) but can also result in significant improvement in the coagulation performance, up to 50% or more.</p>10acoagulation10adye removal10aEffluent treatment10aflocculation10apollution1 aChethana, M.1 aSorokhaibam, Laxmi, Gayatri1 aBhandari, Vinay, M.1 aRaja, S.1 aRanade, Vivek, V.  uhttps://library.ncl.res.in/content/green-approach-dye-wastewater-treatment-using-biocoagulants