Forward osmosis membrane bioreactor using Bacillus and membrane distillation hybrid system for treating dairy wastewater

Song, Hongwei; Liu, Jinrong

Forward osmosis membrane bioreactor using Bacillus and membrane distillation hybrid system for treating dairy wastewater

2021

Song, Hongwei | Liu, Jinrong

Wastewater recycling is one of the best ways to alleviate water scarcity and water/wastewater pollution. The dairy industry is the largest industrial food wastewater source in many countries. In this study, we used a forward osmosis membrane bioreactor (FOMBR) and membrane distillation (MD) hybrid system to recycle dairy wastewater. And we developed a new Bacillus-FOMBR inoculated with salt-tolerant Bacillus sludge to protect against the negative effects of accumulated salt on sludge characteristics, microbial community and treatment effectiveness, and to alleviate membrane biofouling. A laboratory-scale FOMBR-MD experiment was operated for 40 days and water flux, salinity change, sludge characteristics, microbial community, nutrient removal efficiency, and FO membrane fouling were investigated. The Bacillus-FOMBR showed a small decrease in biomass concentration, and the hybrid system removed almost 100% of the contaminants. High-throughput sequencing analysis indicated that Pirellula and Hyphomicrobium species dominated the Bacillus-FOMBR, which are obliged to perform heterotrophic nitrification and aerobic denitrification. These nitrogen-removing bacteria ensured high nitrogen removal efficiency of the bioreactor. The total nitrogen (TN) concentration in the bioreactor increased and then decreased, which did not continuously increase as occurred in conventional FOMBRs. The TN removal efficiency of the bioreactor was mostly above 40% and the highest reached 79%. Besides, the Bacillus-FOMBR suffered little membrane biofouling because of the quorum quenching effect of the Bacillus species. We speculate that the Bacillus-FOMBR has potential to treat high-salt wastewater and high strength ammonia-nitrogen wastewater.

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Mots clés AGROVOC

ammonium nitrogen artificial membranes biomass production dairies denitrification distillation nitrification osmosis pollutants quorum sensing salinity sludge total nitrogen wastewater treatment water pollution water reuse

Informations bibliographiques

Publié dans

Environmental technology

Volume 42 Numéro 12 Pagination 1943 - 1954 ISSN 1479-487X

Editeur

Taylor & Francis

D'autres materias

Bacillus-fombr; Membrane bioreactors; Animal wastes; Heterotrophic bacteria; Halophiles; Pirellula; Bacterial communities; Quorum quenching; Salt accumulation; Biofouling; Microbial community structure; Simultaneous nitrification and denitrification; Hyphomicrobium; Bacillus (bacteria)

Langue

anglais

Note

Golden set

This study was financially supported by the Natural Science Foundation of Inner Mongolia [grant number 2017MS0216]; the Higher Educational Scientific Research Projects of Inner Mongolia Autonomous Region [grant number NJZY17095].

Type

Journal Article; Text

Sur AGRIS depuis: 2024-02-28

Format: MODS

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Cette notice bibliographique a été fournie par National Agricultural Library

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Liens

DOI http://dx.doi.org/10.1080/09593330.2019.1684568

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