Compound bioflocculant and polyaluminum chloride in kaolin-humic acid coagulation: Factors influencing coagulation performance and floc characteristics

2014 ◽  
Vol 172 ◽  
pp. 8-15 ◽  
Author(s):  
Ruihua Li ◽  
Baoyu Gao ◽  
Xin Huang ◽  
Hongyu Dong ◽  
Xiaochen Li ◽  
...  
Keyword(s):  
Humic Acid ◽  
Coagulation Factors ◽  
Polyaluminum Chloride ◽  
Factors Influencing ◽  
Coagulation Performance ◽  
Floc Characteristics ◽  
Acid Coagulation

New Seaweeds Coagulant Aids on Coagulation Performance and Floc Characteristics of Ferric Chloride Coagulant in Kaolin-Humic Acid Solution Treatment

2013 ◽  
Vol 743-744 ◽  
pp. 669-676
Author(s):  
Shuang Zhao ◽  
Bao Yu Gao ◽  
Yan Wang
Keyword(s):  
Humic Acid ◽  
Ferric Chloride ◽  
Sewage Treatment ◽  
Solution Treatment ◽  
Particle Sizing ◽  
Organics Removal ◽  
Coagulation Performance ◽  
Before And After ◽  
Floc Characteristics

Using coagulant aid to increase the organics removal is one of the main methods to improve the coagulation effect. The development of new coagulant aids has vital significance to water supply and sewage treatment. This paper develops two kinds of new seaweeds coagulant aids- Enteromorpha extract (EE) and sodium alginate (SA), and then the two coagulant aids were used together with ferric chloride (FC) in humic acid - kaolin water sample. The coagulation aid effect of EE and SA were studied through the comparation of coagulation effects before and after the application of them. Meanwhile, the growth, breakage and regrowth of flocs were investigated by use of a laser diffraction particle sizing device. The experimental results showed that Ee had significant coagulant aid effect while the aid role of SA was not obvious, but when used together with FC, flocs showed larger particle sizes and growth rates no matter which coagulant aid was selected. Meanwhile the strength and recovery ability of flocs showed a corresponding increase.

Coagulation performance and floc properties of Microcystis aeruginosa in the presence of humic acid

2014 ◽  
Vol 15 (2) ◽  
pp. 339-347
Author(s):  
Peixia Cheng ◽  
Fei Ge ◽  
Xingwang Liu ◽  
Xiaoshuang Zeng ◽  
Biao Chen
Keyword(s):  
Humic Acid ◽  
Microcystis Aeruginosa ◽  
Removal Efficiency ◽  
High Concentration ◽  
Polyaluminum Chloride ◽  
Charge Neutralization ◽  
Low Concentration ◽  
Chl A ◽  
Coagulation Performance ◽  
Floc Properties

Coagulation removal of algae in raw water could be significantly affected by humic acid (HA). A series of jar-tests were conducted to investigate the coagulation performance with polyaluminum chloride and floc properties of Microcystis aeruginosa, a unicellular cyanobacteria, in the presence of HA. Meanwhile the coagulation mechanism was explored through the measurement of zeta potential of the supernatant. The results showed that an optimal removal efficiency of chlorophyll-a (Chl-a) was obtained at pH 8.0 with a low concentration of HA (2 mg/L) and at pH 6.0 with a high concentration of HA (8 mg/L). The floc structure was more compact and bigger-sized and the calculated fractal dimension (Df) was larger at maximum coagulation efficiency. The variation of Df was consistent with that of Chl-a removal efficiency under the same coagulation conditions. Charge neutralization was inferred to be the dominant mechanism to remove algal cells with low concentration of HA, while charge neutralization, gathering and the bridging process worked together to remove algal cells with a high concentration of HA. These results provide insight on how to achieve an optimal removal efficiency of algae in the presence of different concentrations of HA in water treatment.

Coagulation of humic-kaolin-pacl aggregates

2003 ◽  
Vol 47 (1) ◽  
pp. 145-152 ◽  
Author(s):  
W.W. Lin ◽  
S.S. Sung ◽  
D.J. Lee ◽  
Y.P. Chen ◽  
D.S. Chen ◽  
...  
Keyword(s):  
Light Scattering ◽  
Humic Acid ◽  
Water Treatment ◽  
Time Evolution ◽  
Small Angle ◽  
Floc Characteristics ◽  
Small Angle Light Scattering ◽  
Coagulation Dynamics ◽  
High Level ◽  
Polyaluminium Chloride

Water treatment residual flocs are fractal-like aggregates made of many initial aggregates. We investigated in this study the coagulation dynamics for the humic-mineral-polyaluminium chloride (PACl) aggregates using small-angle light scattering techniques and the free-settling test. In contrast to reports in the literature, the presence of humic acid did not lead to a loose floc. Not only the time evolution of the coagulation dynamics, but also the final floc characteristics are only mildly affected by the humic acid. However, the strength of the formed floc does decline with humic acid, which leads to a turbid supernatant with high level of organics.

Peat humic acid properties and factors influencing their variability in a temperate bog ecosystem

2013 ◽  
Vol 62 (1) ◽  
pp. 35 ◽  
Author(s):  
M Klavins ◽  
O Purmalis ◽  
V Rodinov
Keyword(s):  
Humic Acid ◽  
Acid Properties ◽  
Factors Influencing
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