Optimal reduction of chemical oxygen demand and NH3–N from landfill leachate using a strongly resistant novel Bacillus salmalaya strain

Abstract

BackgroundWhen the unavoidable waste generation is considered as damaging to our environment, it becomes crucial to develop a sustainable technology to remediate the pollutant source towards an environmental protection and safety. The development of a bioengineering technology for highly efficient pollutant removal is this regard. Given the high ammonia nitrogen content and chemical oxygen demand of landfill leachate, Bacillus salmalaya strain 139SI, a novel resident strain microbe that can survive in high ammonia nitrogen concentrations, was investigated for the bioremoval of ammonia nitrogen from landfill leachate. The treatability of landfill leachate was evaluated under different treatment parameters, such as temperature, inoculum dosage, and pH.ResultsResults demonstrated that bioaugmentation with the novel strain can potentially improve the biodegradability of landfill leachate. B. salmalaya strain 139SI showed high potential to enhance biological treatment given its maximum NH3–N and COD removal efficiencies. The response surface plot pattern indicated that within 11 days and under optimum conditions (10% v/v inoculant, pH 6, and 35 °C), B. salmalaya strain139SI removed 78% of ammonia nitrogen. At the end of the study, biological and chemical oxygen demands remarkably decreased by 88% and 91.4%, respectively. Scanning electron microscopy images revealed that ammonia ions covered the cell surface of B. salmalaya strain139SI.ConclusionsTherefore, novel resistant Bacillus salmalaya strain139SI significantly reduces the chemical oxygen demand and NH3–N content of landfill leachate.Graphical abstractLeachate treatment by B. salmalaya strain 139SI within 11 days.

Heterotrophic aerobic denitrification by novel bacterium Georgenia daeguensis ARB2 for treatment of nitrate contaminated waters

“…from drinking water reservoir (Huang et al 2015), Acinetobacter junii from activated sludge (Ren et al 2014), Klebsiella sp. from tannery wastewater (Li et al 2019), Paracoccus denitrificans from wastewater (Medhi et al 2017), Bacillus salmalaya from landfill leachate (Dadrasnia et al 2017), Pseudomonas stutzeri from the wastewater treatment plant and activated sludge (Zhao et al 2018;Qing Editorial responsibility: Parveen Fatemeh Rupani. et al 2018), Janthinobacterium sp.…”

Analysis of the Bioaugmentation Potential of Pseudomonas putida OR45a and Pseudomonas putida KB3 in the Sequencing Batch Reactors Fed with the Phenolic Landfill Leachate

“…By comparison, the autochthonous bacteria were able to remove 70% of the COD and 40% of the N-NH 3 [19]. Successful bioaugmentation of the landfill leachate from the pond at the Bukit Beruntung landfill (Malaysia) with the Bacillus salmalaya 139SI strain was also demonstrated by Dadrasnia et al [47], who observed the decrease in the COD and N-NH 3 by 91% and 80%, respectively, as compared to the nonbioaugmented leachate where removal efficiency of both contaminants was slightly above 30%.…”

Enhanced leachate phytodetoxification test combined with plants and rhizobacteria bioaugmentation

“…This is following the research conducted which used Bacillus sp. For leachate treatment and has 40% greater ability than without the addition of bacteria [ 33 ]. Nitrification is a natural water purification process by oxidizing potentially toxic ammonia to non-toxic nitrate, and bacteria Nitrosomonas and Nitrobacter play important roles in this process [ 60 ].…”