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

BMC Biotechnology

Research Article

Salmah Binti Ismail¹  Mohd Sofian Azirun¹  Arezoo Dadrasnia² 

[1] Institute of Biological Sciences, Faculty of Science, University of Malaya, 50603, Kuala Lumpur, Malaysia;Institute of Biological Sciences, Faculty of Science, University of Malaya, 50603, Kuala Lumpur, Malaysia;Institute of Research Management & Monitoring, University of Malaya, 50603, Kuala Lumpur, Malaysia;

关键词: Ammonia nitrogen;    Bacillus salmalaya;    Bioremoval;    Bioengineering process;    Landfill leachate;   

DOI  :  10.1186/s12896-017-0395-9

 received in 2017-04-10, accepted in 2017-10-31,  发布年份 2017

来源: Springer

【 摘 要 】

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.

【 授权许可】

CC BY   
© The Author(s). 2017