Prof. Xinmin Zhan presented his research on NEO-GREEN (Natural/Nano Iron sulphidEs based biOtechnoloGy towaRds nExt gEneratioN wastewater treatment) in the International Water Association Nutrient Removal and Recovery Conference (NRR2018) in Brisbane in 18-22 November, 2018. Through NEO-GREEN, a future wastewater treatment process which will achieve recovery of bioenergy, nitrogen removal and phosphorus recovery from wastewaters with much reduced operation cost can be developed. He told the audience that the NEO-GREEN concept is achievable, compared with the recently widely studied ANAMMOX-based mainstream wastewater treatment process. The concept is the result of studies in a number of years with funding from EU-Marie Curie programme, China Scholarship Council, and the Irish Department of Agriculture, Food and the Marine for the DairyWater project (Ref. 13-F-507).
Prof. Xinmin Zhan was invited by Prof. Yongzhen Peng to visit the School of Environmental and Energy Engineering at Beijing University of Technology in the period of 7 -10 November, 2018. Prof. Zhan presented the concept of NEO-GREEN (Natural/Nano Iron sulphidEs based biOtechnoloGy towaRds nExt gEneratioN wastewater treatment). In his presentation, Prof. Zhan at first briefly introduced the culture and natural beauty of Ireland and the engineering research carried out in the National University of Ireland, Galway. Then, he introduced his research interest and research projects, with the focus on the IASBR technology and the DairyWater project. Prof. Zhan then discussed the laboratory- and pilot-scale research on simultaneous removal of nitrogen and phosphorus through natural and nano iron sulfides based biofilters. Finally, he proposed the novel concept of NEO-GREEN, with which a future wastewater treatment process which will achieve recovery of bioenergy, nitrogen removal and phosphorus recovery from wastewaters with much reduced operation cost can be developed. The NEO-GREEN concept is achievable, compared with the recently widely studied ANAMMOX-based mainstream wastewater treatment process.
Prof. Yongzheng Peng is famous worldwide in the area of biological wastewater treatment, in particular nitrogen removal. He is an academician of the Chinese Academy of Engineering, the Principal Professor in Environmental Science and Engineering at Beijing University of Technology, and the Director of the Beijing Engineering Technology Research Center of Wastewater Nitrogen and Phosphorus Removal.
Prof. Zhan’s research group has published a paper on Start up of partial nitritation-anammox process using intermittently aerated sequencing batch reactor: performance and microbial community dynamics. This research is co-funded by the Irish Department of Agriculture, Food and the Marine for the DairyWater project (Ref.: 13-F-507) and China Scholarship Council.
In his research, he investigated the performance and microbial community dynamics in an intermittently aerated sequencing batch reactor (IASBR) when he developed a new start-up method for the partial nitritation-anammox (PN-A) process. The robustness of this PN-A IASBR system in achieving long-term efficient nitrogen removal was also investigated. Stable partial nitritation with a nitrite accumulation ratio of about 80% was firstly achieved in the IASBR. Then, PN-A process with total nitrogen removal of up to 81.5% was established due to the thriving of anammox bacteria Candidatus Kuenenia resulting from the reduction of the aeration rate. Molecular analysis showed that both bacterial and archaeal communities shifted greatly throughout the start-up stage and the PN-A stage. Besides bacterial genus Nitrosomonas, ammonium-oxidizing archaea (AOA) Candidatus Nitrososphaera with a high abundance of 3.44% also contributed to partial nitritation. Nitrospira was effectively restrained (abundance <1.6%) while methanogens co-existed with the aerobic and anaerobic nitrogen-conversion microorganisms. This study showed that IASBR configuration was efficient in starting up the PN-A process from return sludge, maintaining long-term efficient nitrogen removal and triggering the thrive of AOA.
The full paper is found at: Start-up of partial nitritation-anammox process using intermittently aerated sequencing batch reactor: Performance and microbial community dynamics. Science of Total Environment, 647, 1188-1198, 2019 (authors: Songkai Qiu, Yuansheng Hu, Rui Liu, Xiaolin Sheng, Lvjun Chen, Guangxue Wu, Hongying Hu, Xinmin Zhan)
Task 5 researchers have worked with Task 2 researchers to publish an article Evaluation of dairy processing wastewater biotreatment in an IASBR system: Aeration rate impacts on performance and microbial ecology in the journal of Biotechnology Reports (authors: Beatriz Gil-Pulido, Emma Tarpey, Eduardo L. Almeida, William Finnegan, Xinmin Zhan, Alan D.W. Dobson and Niall O’Leary). The current study is the first to describe the microbial ecology of an intermittently aerated batch reactor system treating synthetic dairy effluent and to asses the impacts of varying aeration rates. The knowledge of bacterial communities in biological wastewater treatments are crucial for stable bioreactor performance and process optimisation. Results suggest members of the Comamonadacae family may contribute significantly to nitrogen and phosphorus remediation processes”. The link to the paper is doi: 10.1016/j.btre.2018.e00263 or https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6036646/. Congratulations to Bea and her supervisors.