COMBINING A SEQUENCING BATCH REACTOR WITH HETEROGENEOUS PHOTOCATALYSIS (TiO<sub>2</sub>/UV) FOR TREATING A PENCIL MANUFACTURER'S WASTEWATER

Padovan, R. N.; Azevedo, E. B.

doi:10.1590/0104-6632.20150321s00003103

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Brazilian Journal of Chemical Engineering

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ENVIRONMENTAL ENGINEERING • Braz. J. Chem. Eng. 32 (1) • Jan-Mar 2015 • https://doi.org/10.1590/0104-6632.20150321s00003103 copy

COMBINING A SEQUENCING BATCH REACTOR WITH HETEROGENEOUS PHOTOCATALYSIS (TiO₂/UV) FOR TREATING A PENCIL MANUFACTURER'S WASTEWATER

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstract

A Sequencing Batch Reactor (SBR) was combined with heterogeneous photocatalysis (TiO₂/UV) as a tertiary treatment for a pencil manufacturer's wastewater. The SBR removed almost all Chemical Oxygen Demand (COD) from the wastewater, although color was barely removed. Photocatalysis was optimized using a factorial design. Final COD, Dissolved Organic Carbon (DOC), and color removals were 95%, 80%, and 93%, respectively. Treated wastewater showed no ecotoxicity towards Lactuca sativa. Color removal kinetics (photocatalysis) followed a pseudo-first order model. The SBR + AOP (Advanced Oxidation Process, TiO₂/UV) combination was a feasibility choice for removing both COD and color from this wastewater.

SBR; AOP; Photocatalysis; TiO₂ ; Color removal; Toxicity

Parameters	Values (mg L ¹)
pH^* * dimensionless	6.70
COD	70
Oils and grease	27
Phenols	< 0.001
Ag	0.021
As	< 0.0001
B	0.2
Ba	< 0.001
Cd	0.010
Cr (hexavalent)	< 0.001
Cr (total)	0.016
Cu	0.012
Cyanides	< 0.001
Fe (soluble)	< 0.005
Fluorides	0.05
Hg	< 0.0001
Mn (soluble)	0.093
Ni	0.039
Pb	0.08
Se	< 0.01
Sn	0.008
Sulfides	< 0.001
Sulphates	39
Zn	0.109

Authors	Wastewater	Processes and Conditions		Removals
Authors	Wastewater	①	②	Removals
Elmolla and Chaudhuri (2011)Elmolla, E. S. and Chaudhuri, M., The feasibility of using combined TiO2 photocatalysis-SBR process for antibiotic wastewater treatment. Desalination, 272(1-3), 218 (2011).	Type^a a According to Scott and Ollis (1995); : 3	Photocatalysis:	SBR^b b SBR: Sequencing Batch Reactor; :
	AMX and CLX^c c AMX: amoxicillin; CLX: cloxacillin;	1 g TiO₂ L^-1	48 h	100% AMX/CLX
		250 mg H₂O₂ L^-1		57% sCOD^d d sCOD: soluble Chemical Oxygen Demand; (670 to 236 mg L^-1)
		pH 5
		5 h
*Xu et al. (2012)*Xu, X., Ji, F.-Y., Fan, Z.-H., He, L., Hu, X.-B. and Zhang, K., Dyestuff wastewater treatment by combined SDS-CuO/TiO2 photocatalysis and sequencing batch reactor. J. Cent. South Univ., 19(6), 1685 (2012).	Type^a a According to Scott and Ollis (1995); : 1	Photocatalysis:	SBR:
	Dyes	2 g SDS ^e e Sodium dodecyl sulfate; -CuO/TiO₂ L^-1	12 h	94% COD (1,134 to 71 mg L^-1)
		40 min		95% BOD^f f BOD: Biochemical Oxygen Demand; (384 to 18 mg L^-1)
*Silva et al. (2013)*Silva, T. F. C. V., Silva, M. E. M. F., Cunha-Queda, A. C., Fonseca, A., Saraiva, I., Boaventura, R. A. R. and Vilar, V. J. P., Sanitary landfill leachate treatment using combined solar photo-Fenton and biological oxidation processes at pre-industrial scale. Chem. Eng. J., 228, 850 (2013).	Type^a a According to Scott and Ollis (1995); : 1	Solar photo-Fenton:	As¹:
	Leachate	13 h	450 h	90% DOC (1,000 to 90 mg L^-1)
*Bustillo- Lecompte et al. (2014)*Bustillo-Lecompte, C. F., Mehrvar, M. and Quiñones-Bolaños, E., Cost-effectiveness analysis of TOC removal from slaughterhouse wastewater using combined anaerobic-aerobic and UV/H2O2 processes. J. Environ. Manage., 134, 145 (2014).	Type^a a According to Scott and Ollis (1995); : 2	ABR^h h Anaerobic Baffled Reactor; -ASⁱ i Activated Sludge :	UV/H₂O₂:
	Slaughterhouse			92% DOC (1,000 to 80 mg L^-1)
	Wastewater	46 h	3 h
	Type^a a According to Scott and Ollis (1995); : 2	SBR:	Photocatalysis:
This work	Dyes	3 h	2 g TiO₂ L^-1	95% COD (700 to 37 mg L^-1)
			pH 7	80% DOC^g g DOC: Dissolved Organic Carbon; (105 to 27 mg L^-1)
			1 h	93% color

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COMBINING A SEQUENCING BATCH REACTOR WITH HETEROGENEOUS PHOTOCATALYSIS (TiO2/UV) FOR TREATING A PENCIL MANUFACTURER'S WASTEWATER

Abstract

COMBINING A SEQUENCING BATCH REACTOR WITH HETEROGENEOUS PHOTOCATALYSIS (TiO₂/UV) FOR TREATING A PENCIL MANUFACTURER'S WASTEWATER