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High Flocculation of Coal Washing Wastewater Using a Novel Bioflocculant from Isaria cicadae GZU6722

XIAO ZOU

XIAO ZOU

Institute of Fungal Resources, Guizhou UniversityGuiyang, China
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ZOU, XIAO
, 
JIALONG SUN

JIALONG SUN

School of Resources and Environmental Engineering, Guizhou Institute of TechnologyGuiyang, China
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SUN, JIALONG
, 
JUAN LI

JUAN LI

Institute of Fungal Resources, Guizhou UniversityGuiyang, China
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LI, JUAN
, 
YANLONG JIA

YANLONG JIA

School of Resources and Environmental Engineering, Guizhou Institute of TechnologyGuiyang, China
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JIA, YANLONG
, 
TANGFU XIAO

TANGFU XIAO

Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education; School of Environmental Science and Engineering, Guangzhou UniversityGuangzhou, China
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XIAO, TANGFU
, 
FANLI MENG

FANLI MENG

Guizhou Academy of Environmental Science and DesignGuiyang, China
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MENG, FANLI
, 
MAOSHENG WANG

MAOSHENG WANG

School of Food and Pharmaceutical Engineering, Guizhou Institute of TechnologyGuiyang, China
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WANG, MAOSHENG
 et 
ZENGPING NING

ZENGPING NING

State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of SciencesGuiyang, China
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NING, ZENGPING
  
28 févr. 2020
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Catégorie d'article: original-paper
Publié en ligne: 28 févr. 2020
Pages: 55 - 64
Reçu: 18 nov. 2019
Accepté: 23 janv. 2020
DOI: https://doi.org/10.33073/pjm-2020-008
Mots clés
© 2020 Xiao Zou et al., published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Fig. 1.

Purified IC-1 from Isaria cicadae GZU6722 and its main composition. A is purified bioflocculant, B is the bioflocculant suspension, and C indicates the main composition of the purified bioflocculant.
Purified IC-1 from Isaria cicadae GZU6722 and its main composition. A is purified bioflocculant, B is the bioflocculant suspension, and C indicates the main composition of the purified bioflocculant.

Fig. 2.

The flocculating performance under various conditions. (A) Different dosage of IC-1; (B) Different mixing time; (C) Different sedimentation time; (D) Different dosage of CaCl2 as a coagulant. Error bars indicate standard deviation of triplicate experiments. Significant differences among different treatments are indicated by lowercase (p < 0.05).
The flocculating performance under various conditions. (A) Different dosage of IC-1; (B) Different mixing time; (C) Different sedimentation time; (D) Different dosage of CaCl2 as a coagulant. Error bars indicate standard deviation of triplicate experiments. Significant differences among different treatments are indicated by lowercase (p < 0.05).

Fig. 3.

The flocculating efficiency of IC-1 and APAM at different dosages. Error bars indicate standard deviation of triplicate experiments. Significant differences among different treatments are indicated by lowercase (p < 0.05).
The flocculating efficiency of IC-1 and APAM at different dosages. Error bars indicate standard deviation of triplicate experiments. Significant differences among different treatments are indicated by lowercase (p < 0.05).

Fig. 4.

The flocculating process after the dosage of IC-1 and APAM. The comparisons between: (A) CK and APAM-assisted samples after 1 min of sedimentation; (B) CK and APAM-assisted samples after 5 min of sedimentation; (C) CK and IC-1-assisted samples after 1 min of sedimentation; (D) CK and IC-1-assisted samples after 5 min of sedimentation; and (E) the comparison among CK, IC-1-assisted, and APAM-assisted samples after 10 min of sedimentation. CK means a control check, i.e., the raw sample without adding any flocculant.
The flocculating process after the dosage of IC-1 and APAM. The comparisons between: (A) CK and APAM-assisted samples after 1 min of sedimentation; (B) CK and APAM-assisted samples after 5 min of sedimentation; (C) CK and IC-1-assisted samples after 1 min of sedimentation; (D) CK and IC-1-assisted samples after 5 min of sedimentation; and (E) the comparison among CK, IC-1-assisted, and APAM-assisted samples after 10 min of sedimentation. CK means a control check, i.e., the raw sample without adding any flocculant.

Fig. 5.

Microscopic images of the fine particles after addition of IC-1 and APAM. (A) CK (10 mm); (B) CK (10 μm); (C) IC-1 (10 mm); (D) IC-1 (10 μm); (E) APAM (10 mm); (F) APAM (10 μm). CK means a control check, i.e., the raw sample without adding any flocculant.
Microscopic images of the fine particles after addition of IC-1 and APAM. (A) CK (10 mm); (B) CK (10 μm); (C) IC-1 (10 mm); (D) IC-1 (10 μm); (E) APAM (10 mm); (F) APAM (10 μm). CK means a control check, i.e., the raw sample without adding any flocculant.

Flocculation performance of IC-1 compared with other microbial flocculants for the coal wastewater treatment_

Bioflocculant Origin Maximum Flocculating Efficiency Additives
IC-1 Isaria cicadae GZU6722 95.8% 2% CaCl2
POS412 Paenibacillus mucilaginosus WL412 96.53% (Xu et al. 2017)
MBF-L918 Pseudomonas veronii L918 95.51% (Liu et al. 2016)
A bioflocculant Azotobacter chroococcum 95.76% (Yang et al. 2019) 50 mg/l CTAB

The estimated costs of APAM and IC-1 to treat 1 metric ton of coal washing wastewater at the same flocculating efficiency_

Cost/t Dosage/g m−3 Cost per metric ton of wastewater
APAM US$ 2300 60 US$ 0.13
IC-1 a US$ 2500 24 US$ 0.06
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Sciences de la vie, Microbiologie et virologie
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