Premium
Anaerobic structured‐bed reactor for azo dye decolorization in the presence of sulfate ions
Author(s) -
Florêncio Thaíla de Mello,
Godoi Leandro AG,
Rocha Vinícius Carvalho,
Oliveira Jean Maikon Santos,
Motteran Fabrício,
Gavazza Sávia,
Vicentine Karina Ferrazzoli Devienne,
Damianovic Márcia Helena Rissato Zamariolli
Publication year - 2021
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.6695
Subject(s) - sulfate , effluent , wastewater , chemical oxygen demand , pulp and paper industry , chemistry , sulfate reducing bacteria , hydraulic retention time , sewage treatment , environmental chemistry , nuclear chemistry , waste management , environmental engineering , environmental science , organic chemistry , engineering
BACKGROUND Textile wastewater is known for its polluting potential and toxicity. Biological, affordable treatments are especially desirable in developing countries to fulfill legal and ecological demands during its treatment. RESULTS The performance of an anaerobic structured‐bed reactor (AnSTBR) treating synthetic textile wastewater containing Direct Black 22 azo dye (DB22; 0.06 mmol L –1 ) and sulfate ions (200 mg L −1 ) was evaluated. The reactor hydraulic retention time (HRT) was 24 h and ethanol was used as the electron donor (1000 mgCOD L −1 ). The AnSTBR achieved an average decolorization efficiency of 68 ± 5%, chemical oxygen demand (COD) efficiency of 77.7 ± 9.2% and sulfate removal of 77.3 ± 5.2%. Toxicity tests showed lower toxicity of the treated effluent to Ceriodaphnia dubia . Despite that, the AnSTBR effluent was still highly toxic to mammalian cells. The metabarcoding technique of the 16S rRNA gene sequencing revealed a consistent community of sulfate‐reducing and azo‐degrading bacteria. CONCLUSION Metagenomic data revealed a promising development of the inoculum in the AnSTB structure. The AnSTB reactor configuration may be a promising alternative for DB22 dye removal from textile wastewater containing sulfate. © 2021 Society of Chemical Industry