Evaluation of various waste substrates for biofilm formation and subsequent use in aerobic packed-bed reactor for secondary treatment of domestic wastewater

Immobilization of bacterial cells on suitable substrates is of utmost importance in the secondary treatment of wastewater using fixed-film reactors. Therefore, screening of efficient and cheaper materials for bacterial surface immobilization was carried out. Eleven waste materials were used as subst...

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Bibliographic Details
Published in:	World journal of microbiology & biotechnology Vol. 37; no. 2; p. 25
Main Authors:	Zimba, Suman, Kumar, Thanikachalam Sathish, Mohan, Natarajan, Rao, Polur Hanumantha
Format:	Journal Article
Language:	English
Published:	Dordrecht Springer Netherlands 01-02-2021 Springer Nature B.V
Subjects:	Aluminum Applied Microbiology Bacteria Biochemistry Biofilms Biomedical and Life Sciences Bioreactors Biotechnology Cattle manure Chemical synthesis Composite materials Domestic wastewater Dung Enumeration Environmental Engineering/Biotechnology Fibers High density polyethylenes Immobilization Jute Life Sciences Metal foils Microbiology Original Paper Parameters Polyethylene Polymers Reactors Sewage disposal Slurries Substrates Waste materials Wastewater treatment Water treatment Fixed-film reactors Bacterial surface immobilization Biofilms Sewage Bioremediation Secondary treatment of domestic wastewater
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Summary:	Immobilization of bacterial cells on suitable substrates is of utmost importance in the secondary treatment of wastewater using fixed-film reactors. Therefore, screening of efficient and cheaper materials for bacterial surface immobilization was carried out. Eleven waste materials were used as substrates, packed in a column, and bacterial surface immobilization was carried out using cow dung slurry/MLSS mixture. All the chosen substrates were screened for bacterial immobilization/biofilm formation by standard bacterial enumeration technique. The substrate with the highest biofilm-forming ability was used for secondary treatment of raw domestic wastewater. The results showed that high-density polyethylene and aluminium foil sheets have poor immobilizing characteristics with 2.2 × 10 8 and 2.4 × 10 8 CFU/cm 2 respectively, whereas jute fibres were observed to be the most efficient among the substrates with 5.1 × 10 23 CFU/cm 2 . The column packed with jute fibres was used for wastewater treatment. Various physico-chemical parameters were analyzed before and after treatment and there was a significant reduction in major parameters after treatment. The bacteria-immobilized jute fibres showed maximum immobilization potential and were highly efficient in wastewater treatment, and therefore these findings offer immense promise in the synthesis of composite polymers for bacterial immobilization and subsequent secondary treatment.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0959-3993 1573-0972
DOI:	10.1007/s11274-020-02992-2