科研之友
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摘要
Implementation of different redox zones is an interesting method to amend single bioreactors for the simultaneous nutrient removal process. Air lift bioreactors have been noticed recently as a system that could provide environments with different oxidation-reduction potentials (ORP). In this study, the performance of a novel continuous feed and intermittent discharge airlift bioreactor (CFIDAB) for simultaneous removal of nutrients (N and P) from soft-drink wastewater was investigated. Three independent variables were selected to analyze, model and optimize the process at three levels. The variables were hydraulic retention time (HRT) (6-14 h), the diameter ratio of internal and external column (D-in/D-out) (0.3-0.7) (corresponding to 10-1 as surface area of downcomer and riser ratio), and dissolved oxygen (DO) concentration (0.5-3.5 mg/l). Three different zones; anaerobic, anoxic, and aerobic zones, were successfully provided in the bioreactor under continuous aeration. An industrial soft drink wastewater with COD:N:P of 100:16:5 was used as feed. The optimum condition was determined as 12 h HRT, a D-in/D-out ratio of 0.5 and DO concentration of 3.5 mg/l. At the optimum condition, COD, TN, and TP removal efficiencies were 98%, 72%, and 65%, respectively. Performance of the CFISAB is extremely influenced by superficial gas velocity due to its direct impact on development of different zones in the single bioreactor. As a conclusion, this innovative single bioreactor is capable to treat wastewaters with high content of carbon and nutrients in smaller volume compared to existing conventional and combined systems.
- 出版日期2016-5-15
