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Frontiers of Environmental Science & Engineering

ISSN 2095-2201

ISSN 2095-221X(Online)

CN 10-1013/X

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Front. Environ. Sci. Eng.    2021, Vol. 15 Issue (5) : 103    https://doi.org/10.1007/s11783-021-1390-x
RESEARCH ARTICLE
Flocculation behaviors of a novel papermaking sludge-based flocculant in practical printing and dyeing wastewater treatment
Kangying Guo, Baoyu Gao(), Jie Wang, Jingwen Pan, Qinyan Yue, Xing Xu
1Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Qingdao 266237, China
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Abstract

•PSBF performed better than PAC and PAM in CODCr removals.

•PSBF was more insensitive to changing pH than PAC and PAM.

•PAC could remove humic acid-like pollutants and dye particles.

•PSBF was efficient in removing tryptophan-like pollutants from PPDW.

•A secondary coagulation-flocculation process (PAC→PSBF) is proposed here.

In our previous studies, several papermaking sludge-based flocculants (PSBFs) were synthesized from wood pulp papermaking sludge. The structure-activity relationships of the PSBFs have been investigated in simulated dye wastewater treatment, but their efficiencies in practical printing and dyeing wastewater (PPDW) treatment are unknown. Herein, an PSBF was prepared, and its performance is discussed in comparison to polyaluminium chloride (PAC) and polyacrylamide (PAM) in PPDW treatment. The PSBF was used in three ways: as an independent flocculant, as a PAC aid, or used to treat the effluent of the PAC system. The results indicated that adding PSBF alone produced similar color and chemical oxygen demand (CODCr) removals as the PAC system alone, but PSBF performed better than PAC when the pH of PPDW was higher than 7.0. Adding PSBF as a PAC aid improved the color, CODCr and turbidity removals, but the elimination efficiencies were slightly lower than those of the PAC+ PAM system. However, when PSBF was used as a flocculant to treat the effluent of the PAC system (PAC→PSBF), the effluent qualities were enhanced. Compared with the PAC system, the color and CODCr removals of PAC→PSBF system increased by 16.21% and 13.26%, respectively. The excitation and emission matrix fluorescence results indicated that PSBF removed tryptophan-like pollutants more efficiently than PAC. Considering the pH requirements of the subsequent bioreactor treatment in practice, the PAC→PSBF system were also investigated at the PPDW pH level of 7.0. Its maximum removal efficiencies of color, CODCr and turbidity were 90.17%, 32.60% and 82.50%, respectively.
Keywords Practical wastewater treatment      Commercial coagulant/flocculant      Secondary coagulation-flocculation process      Chemical oxygen demand      Coagulation-flocculation mechanism     
Corresponding Author(s): Baoyu Gao   
Issue Date: 18 January 2021
 Cite this article:   
Kangying Guo,Baoyu Gao,Jie Wang, et al. Flocculation behaviors of a novel papermaking sludge-based flocculant in practical printing and dyeing wastewater treatment[J]. Front. Environ. Sci. Eng., 2021, 15(5): 103.
 URL:  
https://academic.hep.com.cn/fese/EN/10.1007/s11783-021-1390-x
https://academic.hep.com.cn/fese/EN/Y2021/V15/I5/103
Coagulation
/flocculation systems		 Dosing method PAC dosage
[mg/L (in aluminum)]		 PAM/PSBF dosage (mg/L)
PAC Use alone 100 –
PSBF Use alone – 120
PAC+ PAM Dosing PAC and followed by PAM 100 3
PAC+ PSBF Dosing PAC and followed by PSBF 100 1
PAC→PSBF PSBF was used as a flocculant to treat PAC effluent 100 120
PSBF→PAC PAC was used to treat PSBF effluent 100 120
PAC × PSBF Dosing PAC and followed by PSBF 100 120
PSBF × PAC Dosing PSBF and followed by PAC 100 120
PAC&PSBF PAC and PSBF were mixed before dosing 100 120
Tab.1  The dosing methods and optimal dosages of the coagulants/flocculants in different coagulation/flocculation systems
Fig.1  Color, CODCr and turbidity removal efficiencies (a); size distributions of residual contaminants in supernatants (b); UV-visible spectrum of the effluents (c) and the floc properties (d-g) in different coagulation-flocculation systems. (Conditions: PAC dosage= 100 mg/L (in aluminium), PAM dosage= 3 mg/L, PSBF dosage= 1 mg/L in the PAC+PSBF system, PSBF dosage= 120 mg/L in the PSBF or PAC→PSBF system, the pH of PPDW= 12.40±0.15).
Fig.2  Fluorescence EEM obtained in PPDW (a), effluents of the PAC coagulation system (b), the PSBF system (c), and the PAC→PSBF system (d). (Conditions: PAC dosage= 100 mg/L (in aluminium), PSBF dosage= 120 mg/L, the pH of PPDW= 12.40±0.15).
Fig.3  Color, turbidity and CODCr removal efficiencies (a); FTIR spectra of PAC, PSBF and PAC&PSBF (b); UV-visible spectrum of the effluents (c), and the floc properties (d-g) in different coagulation-flocculation systems. (Conditions: PAC dosages= 100 mg/L (in aluminium), PSBF dosage= 120 mg/L, the pH of PPDW= 12.40±0.15).
Fig.4  Turbidity (a), Color (b) and CODCr removals (c), as well as floc properties (d?i) in different coagulation-flocculation processes under various pH conditions. (Conditions: PAC dosage= 100 mg/L (in aluminium), PAM dosage= 3 mg/L, PSBF dosage= 1 mg/L in the PAC+PSBF system, PSBF dosage= 120 mg/L in the PSBF system).
Fig.5  Full scanning wave results (a); color, turbidity and CODCr removals (b) as well as floc properties (c) in the PAC and PAC→PSBF systems when the pH of PPDW was 7.0. (Conditions: PAC dosage= 100 mg/L (in aluminium), PSBF dosage= 120 mg/L.)
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