Effect of dosing sequence and solution pH on floc properties of the compound bioflocculant-aluminum sulfate dual-coagulant in kaolin-humic acid solution treatment

被引：47

作者：

Bo, Xiaowen ^{[1
]}

Gao, Baoyu ^{[1
]}

Peng, Nana ^{[1
]}

Wang, Yan ^{[1
]}

Yue, Qinyan ^{[1
]}

Zhao, Yingcan ^{[1
]}

机构：

[1] Shandong Univ, Sch Environm Sci & Engn, Jinan 250100, Shandong, Peoples R China

来源：

BIORESOURCE TECHNOLOGY | 2012年 / 113卷

基金：

国家高技术研究发展计划(863计划);

关键词：

Compound bioflocculant; Dual-coagulant; Floc strength; Floc re-growth; Fractal dimension; FLOCCULATION; SIZE; BREAKAGE; REGROWTH; STRENGTH; WATER;

D O I：

10.1016/j.biortech.2011.11.029

中图分类号：

S2 [农业工程];

学科分类号：

0828 ;

摘要：

The compound bioflocculant (CBF)-aluminum sulfate (AS) dual-coagulant and AS were comparatively studied for the coagulation of kaolin-humic acid solution. Floc properties including floc growth rate, size, strength, recoverability and fractal dimension under different pH conditions were investigated by Mastersizer 2000. Results indicated that, the flocs formed by AS-CBF (AS dosed first) showed the largest size and the best recoverability across the pH range investigated. While flocs formed by CBF-AS gave the most compact structure. The three coagulants exhibited similar floc growth rate and strength. Moreover, flocs formed in acidic conditions were stronger and more recoverable but showed lower growth rate, smaller size and looser structure compared to those formed at pH > 6 regardless of the coagulant used. Charge neutralization was the dominant mechanism for AS at low pH, while the coagulation mechanism transformed to enmeshment as the pH increased. There was an additional adsorption bridging effect for AS-CBF and CBF-AS. (C) 2011 Elsevier Ltd. All rights reserved.

引用

页码：89 / 96

页数：8

共 40 条

[1]

[Anonymous], 1999, WATER QUALITY TREATM

[2] Relation between aggregation kinetics and the structure of kaolinite aggregates [J].

Berka, M ;

Rice, JA .

LANGMUIR, 2005, 21 (04) :1223-1229

[3] Coagulation performance and floc properties of compound bioflocculant-aluminum sulfate dual-coagulant in treating kaolin-humic acid solution [J].

Bo, Xiaowen ;

Gao, Baoyu ;

Peng, Nana ;

Wang, Yan ;

Yue, Qinyan ;

Zhao, Yingcan .

CHEMICAL ENGINEERING JOURNAL, 2011, 173 (02) :400-406

[4] Particles under stress [J].

Boller, M ;

Blaser, S .

WATER SCIENCE AND TECHNOLOGY, 1998, 37 (10) :9-29

[5] The potential role of aluminium in Alzheimer's disease [J].

Campbell, A .

NEPHROLOGY DIALYSIS TRANSPLANTATION, 2002, 17 :17-20

[6] Changes in fractal dimension during aggregation [J].

Chakraborti, RK ;

Gardner, KH ;

Atkinson, JF ;

Van Benschoten, JE .

WATER RESEARCH, 2003, 37 (04) :873-883

[7] A study on the removal of organic substances from low-turbidity and low-alkalinity water with metal-polysilicate coagulants [J].

Cheng, Wen Po ;

Chi, Fung Hwa ;

Li, Chun Chang ;

Yu, Ruey Fang .

COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS, 2008, 312 (2-3) :238-244

[8] APPLICATION OF THE PRECIPITATION CHARGE NEUTRALIZATION MODEL OF COAGULATION [J].

DENTEL, SK .

ENVIRONMENTAL SCIENCE & TECHNOLOGY, 1988, 22 (07) :825-832

[9] Coagulation by hydrolysing metal salts [J].

Duan, JM ;

Gregory, J .

ADVANCES IN COLLOID AND INTERFACE SCIENCE, 2003, 100 :475-502

[10] Bacillus mojavensis strain 32A, a bioflocculant-producing bacterium isolated from an Egyptian salt production pond [J].

Elkady, M. F. ;

Farag, Soha ;

Zaki, Sahar ;

Abu-Elreesh, Gadallah ;

Abd-El-Haleemn, Desouky .

BIORESOURCE TECHNOLOGY, 2011, 102 (17) :8143-8151

← 1 2 3 4 →