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Flocculation

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from water sources. Flocculation provides promising results for removing fine particles and treating stormwater runoff from transportation construction projects, but are not used by most state departments of transportation in the U.S. This may be due to regulative restrictions or insufficient guidance for soil sampling requirements in light of changing soil characteristics. States that must achieve a numeric turbidity limit are more inclined to use flocculants, to ensure the appropriate level of treatment.
1659: 87: 300:, flocculation describes clustering of individual dispersed droplets together, whereby the individual droplets do not lose their identity. Flocculation is thus the initial step leading to further ageing of the emulsion (droplet coalescence and the ultimate separation of the phases). Flocculation is used in mineral dressing, but can be also used in the design of physical properties of food and pharmaceutical products. 141:
and flocculation are important processes in fermentation and water treatment with coagulation aimed to destabilize and aggregate particles through chemical interactions between the coagulant and colloids, and flocculation to sediment the destabilized particles by causing their aggregation into floc.
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stands out for its exceptional properties, making it a top contender in this environmentally-conscious endeavor. Chitosan is not only biodegradable but also exhibits a unique ability to bind with a wide range of contaminants, including heavy metals and organic pollutants, effectively removing them
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The process by which the dosage and choice of flocculant are selected is called a jar test. The equipment used for jar testing consists of one or more beakers, each equipped with a paddle mixer. After the addition of flocculants, rapid mixing takes place, followed by slow mixing and later the
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can increase the average particle size making microfiltration more efficient. When flocculants are not added, cakes form and accumulate causing low cell viability. Positively charged flocculants work better than negatively charged ones since the cells are generally negatively charged.
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During flocculation, gentle mixing accelerates the rate of particle collision, and the destabilized particles are further aggregated and enmeshed into larger precipitates. Flocculation is affected by several parameters, including mixing shear and intensity, time and
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Basically, coagulation is a process of addition of coagulant to destabilize a stabilized charged particle. Meanwhile, flocculation is a technique that promotes agglomeration and assists in the settling of particles. The most common used coagulant is
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in that, prior to flocculation, colloids are merely suspended, under the form of a stable dispersion (where the internal phase (solid) is dispersed throughout the external phase (fluid) through mechanical agitation) and are not truly dissolved in
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during the production of beer where cells form macroscopic flocs. These flocs cause the yeast to sediment or rise to the top of a fermentation at the end of the fermentation. Subsequently, the yeast can be collected (cropped) from the top
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particles can be dispersed. The additive that prevents the colloids from forming flocs is called a deflocculant. For deflocculation imparted through electrostatic barriers, the efficacy of a deflocculant can be gauged in terms of
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Process of contact and adhesion whereby dispersed molecules or particles are held together by weak physical interactions ultimately leading to phase separation by the formation of precipitates of larger than colloidal size.
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from the liquid. Flocculation behavior of soil colloids is closely related to freshwater quality. High dispersibility of soil colloids not only directly causes turbidity of the surrounding water but it also induces
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Slomkowski, Stanislaw; Alemán, José V.; Gilbert, Robert G.; Hess, Michael; Horie, Kazuyuki; Jones, Richard G.; Kubisa, Przemyslaw; Meisel, Ingrid; Mormann, Werner; Penczek, Stanisław; Stepto, Robert F. T. (2011).
539:, granular filtration and disinfection. As the demand for eco-friendly solutions in the flocculation process continues to grow, biopolymers are emerging as a highly promising solution. Among these, 491:
is partially determined by the calcium concentration, often in the 50-100ppm range. Calcium salts can be added to cause flocculation, or the process can be reversed by removing calcium by adding
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Rivas, Javier; Prazeres, Ana R.; Carvalho, Fatima; Beltrán, Fernando (2010-07-14). "Treatment of Cheese Whey Wastewater: Combined Coagulation−Flocculation and Aerobic Biodegradation".
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Investigation of laws of selective flocculation of coals with synthetic latexes / P. V. Sergeev, V. S. Biletskyy // ICCS’97. 7–12 September 1997, Essen, Germany. V. 1. pp. 503–506.
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a state or condition of a dispersion of a solid in a liquid in which each solid particle remains independent and unassociated with adjacent particles (much like
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definition, flocculation is "a process of contact and adhesion whereby the particles of a dispersion form larger-size clusters". Flocculation is synonymous with
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Lamanna, Leonardo; Giacoia, Gabriele; Friuli, Marco; Leone, Gabriella; Carlucci, Nicola; Russo, Fabrizio; Sannino, Alessandro; Demitri, Christian (2023-06-13).
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The definition proposed here is recommended for distinguishing agglomeration from aggregation. The particles that comprise agglomerates can be dispersed again.
810: 38: 535:, storm-water treatment and treatment of industrial wastewater streams. Typical treatment processes consist of grates, coagulation, flocculation, 1475: 841: 729: 515: 1025:
Han, Binbing; Akeprathumchai, S.; Wickramasinghe, S. R.; Qian, X. (2003-07-01). "Flocculation of biological cells: Experiment vs. theory".
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Richard G. Jones; Edward S. Wilks; W. Val Metanomski; Jaroslav Kahovec; Michael Hess; Robert Stepto; Tatsuki Kitayama, eds. (2009).
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the calcium ions. While it appears similar to sedimentation in colloidal dispersions, the mechanisms are different.
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are caused to clump together into a floc. The floc may then float to the top of the liquid (creaming),
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John C. Crittenden, R. Rhodes Trussell, David W. Hand, Kerry J. Howe, George Tchobanoglous (2012),
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due to the adsorption of nutritional substances in rivers and lakes and even boats under the sea.
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Compendium of Polymer Terminology and Nomenclature (IUPAC Recommendations 2008) "The Purple Book"
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In the brewing industry flocculation has a different meaning. It is a very important process in
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to improve the efficiency of biological feeds. The addition of synthetic flocculants to the
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to sediment in the form of floc or flake, either spontaneously or due to the addition of a
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Process by which colloidal particles come out of suspension to precipitate as floc or flake
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Operational Control of Coagulation and Filtration Processes (M37): AWWA Manual of Practice
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sedimentation process. Samples can then be taken from the aqueous phase in each beaker.
107: 48:: Reversible formation of aggregates in which the particles are not in physical contact. 1325: 1285: 1252: 1038: 898:
Adamson A.W. and Gast A.P. (1997) "Physical Chemistry of Surfaces", John Wiley and Sons.
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Deflocculation can be a problem in wastewater treatment plants as it commonly causes
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Pal, Preeti; Pal, Anjali; Nakashima, Kazunori; Yadav, Brijesh Kumar (2021-03-01).
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Fuhrmann, Philipp L.; Sala, Guido; Stieger, Markus; Scholten, Elke (2019-08-01).
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fermentation) of the fermenter in order to be reused for the next fermentation.
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Deflocculation is the exact opposite of flocculation, also sometimes known as
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Jin, Y-L.; Speers, R.A.. (1999). "Flocculation in Saccharomyces cerevisiae".
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making to determine how long the curds must set. The reaction involving the
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4x speed video of floc settling after adding flocculant polymers during a
1678: 1533: 648: 624: 595:. According to the Encyclopedic Dictionary of Polymers deflocculation is 559: 553: 268: 633: – Various progressive interactions between clay minerals and water 1698: 1683: 1573: 1508: 1453: 405: 373: 280: 1138: 1781: 492: 343: 669: – Type of settler designed to remove particulates from liquids 1738: 1713: 1498: 1024: 966:
Arora, Satyam; Doda, Veena; Rani, Sunita; Kotwal, Urvershi (2015).
684: 611: 603:). A deflocculated suspension shows zero or very low yield value". 600: 540: 297: 272: 99: 70:
In contrast to aggregation, agglomeration is a reversible process.
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Coagulation-flocculation process in a water treatment system
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MWH's water treatment: principles and design, third edition
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Flocculation is widely employed to measure the progress of
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Flocculation and sedimentation are widely employed in the
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Cheese Volume 1: Chemistry, Physics, and Microbiology
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Pages displaying wikidata descriptions as a fallback
1389:Gooch, Jan W., ed. (2007-01-01). "Deflocculation". 1226:"Water Treatment Process Monitoring and Evaluation" 965: 495:to form insoluble calcium phosphate, adding excess 325: 267:, flocculation refers to the process by which fine 627: – Aquaculture involving the farming of algae 1384: 1382: 720: 1815: 878:. American Water Works Association. 2011-06-01. 582:of solutions and domination of monovalent metal 1379: 415:. Three different coagulants are mainly used: 1469: 499:to form insoluble calcium sulfate, or adding 1427:Particles in water: properties and processes 1102:Cheese - Chemistry, Physics and Microbiology 843:Encyclopedia of Surface and Colloid Science 675: – Clumping of particles in suspension 610:settling problems and deterioration of the 1476: 1462: 1127:Journal of Agricultural and Food Chemistry 574:) is a typical example. Usually in higher 510: 1284: 1232:. American Water Works Association (AWWA) 1196: 1146: 1001: 983: 934: 53:Agglomeration (except in polymer science) 1483: 1177: 514: 411:Flocculation is also used during cheese 85: 61:Flocculation (except in polymer science) 1223: 1066: 1064: 839: 338:, flocculation is a condition in which 57:Coagulation (except in polymer science) 14: 1816: 1104:(3rd ed.). Elsevier. p. 72. 1079:: Aspen Publishers. pp. 144–150. 303: 1457: 1388: 1362: 1178:Brungard, Martin (20 February 2018). 291: 1061: 972:Asian Journal of Transfusion Science 687: – Water from a sea or an ocean 258: 1391:Encyclopedic Dictionary of Polymers 1099: 1070: 389:formation in the initial stages of 24: 1419: 1393:. Springer New York. p. 265. 816:Compendium of Chemical Terminology 380: 145: 25: 1855: 1334:10.1016/j.chemosphere.2020.128934 1224:Beverly, Richard P (2014-04-17). 691:Smoluchowski coagulation equation 547: 368:applications in conjunction with 360:Yeast flocculation § Process 46:Flocculation (in polymer science) 1657: 790:(2nd ed.). RSC Publishing. 408:of molecules and macropeptides. 326:Civil engineering/earth sciences 189:The chemical reaction involved: 1356: 1301: 1244: 1217: 1190: 1171: 1118: 1093: 1018: 253: 1399:10.1007/978-0-387-30160-0_3313 1369:Transportation Research Record 959: 910: 901: 892: 866: 833: 804: 779: 13: 1: 1211:10.1016/S0963-9969(99)00021-6 936:10.1016/j.foodres.2019.04.027 713: 481:fermentation) or the bottom ( 275:to the bottom of the liquid ( 213: 346:, a floc. In dispersed clay 7: 1363:Kazaz, Billur (July 2021). 923:Food Research International 846:. CRC Press. p. 4230. 840:Hubbard, Arthur T. (2004). 617: 244: 10: 1860: 1694:Electrostatic precipitator 738:Pure and Applied Chemistry 578:ranges in addition to low 551: 465: 461: 357: 353: 318: 126:. The action differs from 29: 1795: 1767: 1734:Rotary vacuum-drum filter 1666: 1655: 1491: 1443:, John Wiley & Sons, 1777:Aqueous two-phase system 1599:Liquid–liquid extraction 1429:, Taylor & Francis, 1269:10.1021/acsomega.3c01257 1100:Fox, Patrick F. (2004). 1071:Fox, Patrick F. (1999). 985:10.4103/0973-6247.150979 751:10.1351/PAC-REC-10-06-03 364:Flocculation is used in 32:Flocculent spiral galaxy 1674:API oil–water separator 1544:Dissolved air flotation 829:10.1351/goldbook.F02429 511:Water treatment process 76:This quotation is from 1639:Solid-phase extraction 1077:Gaithersburg, Maryland 631:Clay–water interaction 520: 118:particles come out of 114:is a process by which 103: 83: 1759:Vacuum ceramic filter 1754:Sublimation apparatus 1559:Electrochromatography 1519:Cross-flow filtration 1425:John Gregory (2006), 1375:(7) – via Sage. 1047:10.1002/aic.690490709 703:Syneresis (chemistry) 518: 402:Smoluchowski kinetics 321:Porges-Meier reaction 97: 43: 1834:Separation processes 1709:Fractionating column 1504:Acid–base extraction 1485:Separation processes 673:Particle aggregation 637:Deposition (geology) 413:wastewater treatment 1529:Cyclonic separation 1326:2021Chmsp.26628934P 1263:(23): 20708–20713. 1039:2003AIChE..49.1687H 314:rapid plasma reagin 304:Medical diagnostics 108:colloidal chemistry 1829:Chemical processes 1589:Gravity separation 521: 489:Yeast flocculation 468:Yeast flocculation 455:iron(III) chloride 310:medical laboratory 292:Physical chemistry 104: 1811: 1810: 1729:Rapid sand filter 1624:Recrystallization 1604:Electroextraction 1564:Electrofiltration 1449:978-0-470-40539-0 1408:978-0-387-31021-3 1180:"Water Knowledge" 1139:10.1021/jf100602j 1133:(13): 7871–7877. 1111:978-0-12-263653-0 1086:978-0-8342-1378-4 853:978-0-8247-0759-0 797:978-0-85404-491-7 745:(12): 2229–2259. 667:Lamella clarifier 661:Isoelectric point 444:aluminium sulfate 332:civil engineering 279:), or be readily 265:colloid chemistry 259:Surface chemistry 150:According to the 95: 16:(Redirected from 1851: 1661: 1478: 1471: 1464: 1455: 1454: 1413: 1412: 1386: 1377: 1376: 1360: 1354: 1353: 1305: 1299: 1298: 1288: 1248: 1242: 1241: 1239: 1237: 1221: 1215: 1214: 1205:(6–7): 421–440. 1194: 1188: 1187: 1175: 1169: 1168: 1150: 1148:20.500.12207/540 1122: 1116: 1115: 1097: 1091: 1090: 1075:(2nd ed.). 1068: 1059: 1058: 1033:(7): 1687–1701. 1022: 1016: 1015: 1005: 987: 963: 957: 956: 938: 914: 908: 905: 899: 896: 890: 889: 870: 864: 863: 861: 860: 837: 831: 808: 802: 801: 783: 777: 776: 774: 773: 767: 761:. 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Int 1193: 1185: 1181: 1174: 1166: 1162: 1158: 1154: 1149: 1144: 1140: 1136: 1132: 1128: 1121: 1113: 1107: 1103: 1096: 1088: 1082: 1078: 1074: 1067: 1065: 1056: 1052: 1048: 1044: 1040: 1036: 1032: 1028: 1027:AIChE Journal 1021: 1013: 1009: 1004: 999: 995: 991: 986: 981: 977: 973: 969: 962: 954: 950: 946: 942: 937: 932: 928: 924: 920: 913: 904: 895: 887: 881: 877: 876: 869: 855: 849: 845: 844: 836: 830: 826: 822: 818: 817: 812: 807: 799: 793: 789: 782: 768:on 2013-10-20 764: 760: 756: 752: 748: 744: 740: 739: 731: 723: 719: 704: 701: 698: 695: 692: 689: 686: 683: 680: 677: 674: 671: 668: 665: 662: 659: 656: 653: 650: 647: 644: 641: 638: 635: 632: 629: 626: 623: 622: 615: 613: 609: 604: 602: 598: 594: 589: 585: 581: 577: 565: 561: 555: 545: 542: 538: 537:sedimentation 534: 530: 526: 517: 508: 506: 502: 498: 494: 490: 486: 484: 480: 475: 469: 456: 448: 445: 429: 426: 418: 417: 416: 414: 409: 407: 403: 399: 396: 392: 388: 378: 375: 371: 367: 366:biotechnology 361: 351: 349: 345: 341: 337: 334:, and in the 333: 322: 317: 315: 311: 301: 299: 289: 287: 282: 278: 277:sedimentation 274: 270: 266: 251: 242: 240: 192: 191: 190: 187: 169: 163: 161: 157: 156:agglomeration 153: 143: 140: 136: 134: 129: 128:precipitation 125: 121: 117: 113: 109: 101: 79: 75: 72: 69: 68: 66: 62: 58: 54: 49: 47: 40: 33: 19: 1704:Filter press 1689:Depth filter 1579:Flocculation 1578: 1549:Distillation 1440: 1426: 1390: 1372: 1368: 1358: 1317: 1313: 1303: 1260: 1256: 1246: 1234:. 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Retrieved 763:the original 742: 736: 722: 605: 596: 557: 525:purification 522: 487: 474:fermentation 471: 410: 384: 363: 329: 307: 295: 269:particulates 262: 254:Applications 248: 235: 209:O → 2 Al(OH) 188: 164: 149: 137: 112:flocculation 111: 105: 60: 56: 52: 51: 45: 44: 1679:Belt filter 1644:Sublimation 1534:Decantation 1314:Chemosphere 1236:October 14, 1184:Bru'n Water 929:: 537–547. 649:DLVO theory 625:Algaculture 560:peptization 554:Peptization 160:coalescence 139:Coagulation 1824:Metallurgy 1818:Categories 1768:Multiphase 1699:Evaporator 1684:Centrifuge 1574:Filtration 1569:Extraction 1509:Adsorption 1499:Absorption 1320:: 128934. 978:(1): 109. 859:2007-11-13 772:2013-07-27 714:References 601:emulsifier 406:hydrolysis 374:bioreactor 358:See also: 319:See also: 216:+ 6 H + 3 120:suspension 41:definition 18:Flocculent 1782:Azeotrope 1492:Processes 1342:0045-6535 1277:2470-1343 1257:ACS Omega 1157:0021-8561 1055:1547-5905 994:0973-6247 945:0963-9969 614:quality. 588:colloidal 493:phosphate 344:structure 298:emulsions 116:colloidal 1839:Sewerage 1796:Concepts 1787:Eutectic 1739:Scrubber 1714:Leachate 1594:Leaching 1539:Dialysis 1350:33246700 1295:37332801 1286:10268613 1165:20557068 1012:25722593 953:31229109 759:96812603 685:Seawater 618:See also 612:effluent 541:chitosan 398:micelles 348:slurries 281:filtered 245:Jar test 133:solution 100:jar test 1770:systems 1667:Devices 1614:Osmosis 1322:Bibcode 1035:Bibcode 1003:4339923 584:cations 505:chelate 497:sulfate 462:Brewing 354:Biology 1554:Drying 1447:  1433:  1405:  1348:  1340:  1293:  1283:  1275:  1230:Knovel 1163:  1155:  1108:  1083:  1053:  1010:  1000:  992:  951:  943:  882:  850:  794:  757:  608:sludge 395:rennet 391:cheese 316:test. 273:settle 205:· 14 H 1749:Still 811:IUPAC 766:(PDF) 755:S2CID 733:(PDF) 483:lager 340:clays 308:In a 228:+ 8 H 152:IUPAC 39:IUPAC 1445:ISBN 1431:ISBN 1403:ISBN 1373:2675 1346:PMID 1338:ISSN 1291:PMID 1273:ISSN 1238:2015 1161:PMID 1153:ISSN 1106:ISBN 1081:ISBN 1051:ISSN 1008:PMID 990:ISSN 949:PMID 941:ISSN 880:ISBN 848:ISBN 792:ISBN 586:the 501:EDTA 449:FeCl 419:FeSO 387:curd 296:For 182:·14H 170:, Al 168:alum 1395:doi 1330:doi 1318:266 1281:PMC 1265:doi 1207:doi 1143:hdl 1135:doi 1043:doi 998:PMC 980:doi 931:doi 927:122 825:doi 823:". 747:doi 570:SiO 566:(Na 527:of 503:to 479:ale 434:(SO 330:In 263:In 214:(s) 197:(SO 186:O. 174:(SO 106:In 1820:: 1401:. 1381:^ 1371:. 1367:. 1344:. 1336:. 1328:. 1316:. 1312:. 1289:. 1279:. 1271:. 1259:. 1255:. 1228:. 1203:31 1201:. 1182:. 1159:. 1151:. 1141:. 1131:58 1129:. 1063:^ 1049:. 1041:. 1031:49 1029:. 1006:. 996:. 988:. 974:. 970:. 947:. 939:. 925:. 921:. 813:, 753:. 743:83 741:. 735:. 576:pH 562:. 430:Al 239:pH 218:SO 193:Al 162:. 135:. 110:, 1477:e 1470:t 1463:v 1411:. 1397:: 1352:. 1332:: 1324:: 1297:. 1267:: 1261:8 1240:. 1213:. 1209:: 1186:. 1167:. 1145:: 1137:: 1114:. 1089:. 1057:. 1045:: 1037:: 1014:. 982:: 976:9 955:. 933:: 888:. 862:. 827:: 800:. 775:. 749:: 597:" 572:3 568:2 477:( 457:) 453:( 451:3 446:) 442:( 440:3 438:) 436:4 432:2 427:) 423:( 421:4 232:O 230:2 223:4 211:3 207:2 203:3 201:) 199:4 195:2 184:2 180:3 178:) 176:4 172:2 102:. 34:. 20:)

Index

Flocculent
Flocculent spiral galaxy
IUPAC
the Purple Book
jar test
colloidal chemistry
colloidal
suspension
clarifying agent
precipitation
solution
Coagulation
IUPAC
agglomeration
coalescence
alum
pH
colloid chemistry
particulates
settle
sedimentation
filtered
eutrophication
emulsions
medical laboratory
rapid plasma reagin
Porges-Meier reaction
civil engineering
earth sciences
clays

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