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

XIAO ZOU
XIAO ZOU
, 
JIALONG SUN
JIALONG SUN
, 
JUAN LI
JUAN LI
, 
YANLONG JIA
YANLONG JIA
, 
TANGFU XIAO
TANGFU XIAO
, 
FANLI MENG
FANLI MENG
, 
MAOSHENG WANG
MAOSHENG WANG
 e 
ZENGPING NING
ZENGPING NING
   | 28 feb 2020
Polish Journal of Microbiology's Cover Image
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Article Category: original-paper
Pubblicato online: 28 feb 2020
Pagine: 55 - 64
Ricevuto: 18 nov 2019
Accettato: 23 gen 2020
DOI: https://doi.org/10.33073/pjm-2020-008
Parole chiave
© 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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