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Author:

Du, Peng (Du, Peng.) | Li, Xing (Li, Xing.) | Yang, Yanling (Yang, Yanling.) (Scholars:杨艳玲) | Fan, Xiaoyan (Fan, Xiaoyan.) (Scholars:樊晓燕) | Zhang, Tingting (Zhang, Tingting.) | Wang, Nan (Wang, Nan.) | Li, Hang (Li, Hang.) | Ji, Siyang (Ji, Siyang.) | Zhou, Zhiwei (Zhou, Zhiwei.) (Scholars:周志伟)

Indexed by:

EI Scopus SCIE PubMed

Abstract:

In a coagulation-flocculation process, optimal separation of the resultant aggregates plays a decisive role on coagulation performance and provides a lower burden for subsequent treatment units. This separation highly depends on the stability of the micro-flocs formed during the initial, rapid stage of coagulation. In this work, a two-stage addition of aluminium sulphate (alum, Al-2(SO4)(3)) was employed by adding 0.04 and 0.08 mM Al-2(SO4)(3) at the beginning and the end of rapid mixing, respectively. The coagulation performance and floc characteristics were compared to conventional single addition with the same total coagulant dosage, and the effects of variable rapid-mixing speeds (160-850 rpm) and duration time (10-120 s) were investigated. The results showed that the residual turbidity of two-stage coagulant addition was 85.1% lower than single addition when applied at a mixing speed of 580 rpm and a duration time of 120 s. The underlying coagulation mechanism revealed that the two-step addition more effectively neutralized colloids and formed larger aggregates that settled better and could more easily be removed. Moreover, the aggregates were less firm, which was attributed to different interactions among the micro-flocs, the second addition of Al-2(SO4)(3) and destabilized colloids. The present work provides data to broaden the window of rapid-mixing environments for more effective coagulation.

Keyword:

Two-stage coagulant final aggregate velocity gradient coagulation-flocculation micro-floc

Author Community:

  • [ 1 ] [Du, Peng]Beijing Univ Technol, Coll Architecture & Civil Engn, 100 Xi Da Wang Rd, Beijing 100124, Peoples R China
  • [ 2 ] [Li, Xing]Beijing Univ Technol, Coll Architecture & Civil Engn, 100 Xi Da Wang Rd, Beijing 100124, Peoples R China
  • [ 3 ] [Yang, Yanling]Beijing Univ Technol, Coll Architecture & Civil Engn, 100 Xi Da Wang Rd, Beijing 100124, Peoples R China
  • [ 4 ] [Fan, Xiaoyan]Beijing Univ Technol, Coll Architecture & Civil Engn, 100 Xi Da Wang Rd, Beijing 100124, Peoples R China
  • [ 5 ] [Zhang, Tingting]Beijing Univ Technol, Coll Architecture & Civil Engn, 100 Xi Da Wang Rd, Beijing 100124, Peoples R China
  • [ 6 ] [Wang, Nan]Beijing Univ Technol, Coll Architecture & Civil Engn, 100 Xi Da Wang Rd, Beijing 100124, Peoples R China
  • [ 7 ] [Li, Hang]Beijing Univ Technol, Coll Architecture & Civil Engn, 100 Xi Da Wang Rd, Beijing 100124, Peoples R China
  • [ 8 ] [Ji, Siyang]Beijing Univ Technol, Coll Architecture & Civil Engn, 100 Xi Da Wang Rd, Beijing 100124, Peoples R China
  • [ 9 ] [Zhou, Zhiwei]Beijing Univ Technol, Coll Architecture & Civil Engn, 100 Xi Da Wang Rd, Beijing 100124, Peoples R China

Reprint Author's Address:

  • 周志伟

    [Zhou, Zhiwei]Beijing Univ Technol, Coll Architecture & Civil Engn, 100 Xi Da Wang Rd, Beijing 100124, Peoples R China

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Source :

ENVIRONMENTAL TECHNOLOGY

ISSN: 0959-3330

Year: 2020

Issue: 20

Volume: 42

Page: 3122-3131

2 . 8 0 0

JCR@2022

ESI Discipline: ENVIRONMENT/ECOLOGY;

ESI HC Threshold:138

Cited Count:

WoS CC Cited Count: 5

SCOPUS Cited Count:

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 0

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