Citation: ZHANG Hu-Jun, JIANG Lan, LIU Chang-Yu, DONG Shao-Jun, JIANG Dong-Min, ZHANG Yu. Biofilm Reactor-Based Online Biochemical Oxygen Demand Measurement and Instrument Design[J]. Chinese Journal of Analytical Chemistry, ;2016, 44(10): 1619-1624. doi: 10.11895/j.issn.0253-3820.160267
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A biofilm reactor (BFR) was fabricated via a cultivation process using naturally occurring microbial seeds from locally collected wastewaters, and a series of researches were carried out with this BFR based online Biochemical Oxygen Demand (BOD) monitor. The results showed that the BFR cultivation time was less than 14 h, and the biodegradation efficiencies was 18.5%. The minimum detection limit was 0.5 mg/L, as well as the upper detection limit was 20 mg/L. The relative error and relative standard deviation in accuracy and long term stability to standard were -0.8% and ±3.2%, respectively. The real sample determinations showed an average relative error of +5.6% to conventional BOD5 method. The BFR maintained a good performance in long term stability and accuracy during this test period, and the broad linear range ensured the demand for surface water online monitoring.
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