Progress in decontamination by halophilic microorganisms in saline wastewater and soil

Abstract

Review on the decontaminative capabilities of halophilic microorganisms in saline wastewater and soil. a r t i c l e i n f o a b s t r a c tEnvironments with high-salt concentrations are often populated by dense microbial communities. Halophilic microorganisms can be isolated from different saline environments and different strains even belonging to the same genus have various applications. Wastewater and soil rich in both organic matter and salt are difficult to treat using conventional microorganisms typically found in wastewater treatment and soil bioremediation facilities. Studies on decontaminative capabilities and decontamination pathways of organic contaminants (i.e., aromatic compounds benzoate, cinnamate, 3-phenylpropionate, 4-hydroxybenzoic acid), heavy metals (i.e., tellurium, vanadium), and nutrients in the biological treatment of saline wastewater and soil by halophilic microorganisms are discussed in this review.

Removal performance and microbial communities in a sequencing batch reactor treating hypersaline phenol-laden wastewater

“…It was found from previous study that the bacteria belonging to phylum Firmicutes had spores which were able to endure relatively harsh microbial habitats (Zhuang et al, 2010). Therefore, it was reasonable that both samples in this study contained microorganisms affiliated to phylum Firmicutes.…”

Optimization and characterization of chromium(VI) reduction in saline condition by moderately halophilic Vigribacillus sp. isolated from mangrove soil of Bhitarkanika, India

“…While, halophiles are the salt loving organisms and able to grow exclusively in presence of salt, halotolerant organisms, can grow both in high salinity and in the absence of salts [17]. Among the two groups, halophilic microorganisms capable of resisting toxic metals are found to be most promising candidate for bioremediation of contaminated saline soil and water discharge sites [13,14] but not much report [13,15] on bioremediation potential of halophilic bacteria for saline environment contaminated with Cr(VI) is available yet.…”

“…In this context, the halophilic and halotolerant microorganisms may be suitable for bioremediation of such environment, since high concentration of anions and cations are needed for their growth [9]. Although, these microorganisms have already been utilized in bioremediation of oil, textile effluents and oxyanion pollutions [10][11][12] their potential for bioremediation and bioreduction of chromate has been sparsely studied [13][14][15]. Moreover, the bacterial strains used for chromate reduction were isolated from either tannery effluents [13] or hypersaline soda lake [15] and therefore requires further studies on these bacterial species isolated from Cr(VI) free soils to make the Cr(VI) bioremediation process practically feasible using halophilic bacteria.…”

Biodegradation of phenanthrene by Pseudomonas sp. BZ-3, isolated from crude oil contaminated soil

“…A variety of halophilic microorganisms have been isolated from marine or saline water and sediment for the degradation of PHE (Li and Bai, 2005). Compared with non-halophilic degraders, halophilic degraders could treat the contaminants, as well as maintaining an osmotic balance with their external environment (Zhuang et al, 2010). To the best of our knowledge, even though many studies were conducted on halophilic microorganisms for biodegradation of PAHs (Melcher et al, 2002), less attention has been paid to the environmental operation factors and metabolic products during the biodegradation process (Feng et al, 2012).…”