Advanced treatment technologies for the removal of color and phenol from the effluent of paper industry wastewater

Bender, Ana Flávia; Souza, Jeanette Beber de; Vidal, Carlos Magno de Sousa

doi:10.5902/1980509832503

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Artigos • Ciênc. Florest. 29 (2) • Apr-Jun 2019 • https://doi.org/10.5902/1980509832503 copy

Advanced treatment technologies for the removal of color and phenol from the effluent of paper industry wastewater

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstract

This paper analyzes the removal of colour and phenol found in pulp and paper industry wastewater using advanced technologies: (i) coagulation-flocculation-sedimentation, (ii) granular activated carbon filtration, (iii) combination of coagulation-flocculation-sedimentation and granular activated carbon filtration. Jar tests and bench-scale column tests were performed. The main results obtained were: removals of 89% and 60% for colour and phenol, respectively, using coagulation-flocculation-sedimentation; for activated carbon filtration, overall colour and phenol removal of 45% and 47%, respectively; and maximum removals obtained were 99% for colour and above 93% for phenol, when the complete cycle (coagulation-flocculation-sedimentation combined with filtration) was tested. Along with this last treatment, it was possible to obtain a high-quality final effluent and to comply with the environmental regulations in several aspects.

Keywords:
Industrial effluents; Tertiary treatment; Activated carbon

Tabela 1 Parâmetros analisados, métodos analíticos e equipamentos empregados na pesquisa.

Parâmetro	Método analítico e equipamento utilizado	Número do método, segundo American Public Health Association; American Water Works Association; Water Environment Federation (2012)AMERICAN PUBLIC HEALTH ASSOCIATION; AMERICAN WATER WORKS ASSOCIATION; WATER ENVIRONMENT FEDERATION. Standart methods for examination of water and wastewater. 19th ed. Washington: American Public Health Association, 2012.
Turbidez (uT)	Nefelométrico - Turbidímetro 2100 Q, Hach	2130B
Cor verdadeira (uC)	Espectrofotometria - Espectrofotômetro UV-Vis DR 6000, Hach	2120C
DQO solúvel (mg L^-1)	Colorimétrico - Espectrofotômetro UV-Vis DR 6000, Hach	5220D
pH (-)	Potenciométrico - peagâmetro PHS-3B, PHTEK	4500-H⁺B
Fenol (mg L^-1)	Colorimétrico - Espectrofotômetro UV-Vis DR 6000, Hach	5530B

Tabela 2 Caracterização do efluente final da ETE da indústria de papel e celulose.

Parâmetro	Médias de valores e desvio padrão
Cor Verdadeira (uC)	707,0 ± 106,0
Turbidez (uT)	7,4 ± 0,6
DQO Solúvel (mg L^-1)	141,0 ± 2,0
Fenol (mg.L^-1)	7,8 ± 0,7
pH	8,3 ± 0,0

Tabela 3 Resumo do teste t de Student para os parâmetros analisados no processo de coagulação/floculação/sedimentação com amostra bruta.

Parâmetro	Amostra Bruta	Amostra Tratada	R (%)	t	p
Cor Verdadeira (uC)	707,0	77,0	89	9,91	0,0050*
Turbidez (uT)	7,4	2,8	62	38,55	0,0003*
DQO Solúvel (mg L^-1)	141,0	119,0	16	6,24	0,0123*
Fenol (mg L^-1)	7,8	3,1	60	32,11	0,0004*

Tabela 4 Resumo do teste t de Student para os parâmetros analisados no processo de filtração em CAG com amostra bruta.

Parâmetro	Amostra Bruta	Amostra Tratada	R (%)	t	p
Cor Verdadeira (uC)	707,0	388,0	45	5,467	0,0159*
Turbidez (uT)	7,4	2,8	62	13,314	0,0027*
DQO Solúvel (mg.L^-1)	141,0	87,6	38	12,246	0,0033*
Fenol (mg.L^-1)	7,8	4,2	47	10,392	0,0045*

Tabela 5 Resumo do teste t de Student para os parâmetros analisados no processo por ciclo completo.

Parâmetro	Amostra Bruta	Amostra Tratada	R (%)	t	p
Cor Verdadeira (uC)	707,0	6,0	99	11,08	0,0040*
Turbidez (uT)	7,4	0,7	91	16,68	0,0017*
DQO Solúvel (mg L^-1)	141,0	51,4	64	18,76	0,0028*
Fenol (mg L^-1)	7,8	ALD	> 93	17,07	0,0017*

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[TFN1] Fonte: Autores (2018)