State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences , Changchun 130022, People's Republic of China.
Environ Sci Technol. 2014;48(3):1762-8. doi: 10.1021/es4031358. Epub 2014 Jan 15.
This work describes the development of a novel biofilm reactor-photoelectrocatalytic chemical oxygen demand (BFR-PeCOD) analytical system for rapid online determination of biodegradable organic matters (BOMs). A novel air bubble sample delivery approach was developed to dramatically enhance the BFR's biodegradation efficiency and extend analytical linear range. Because the air bubble sample delivery invalidates the BOD quantification via the determination of oxygen consumption using dissolved oxygen probe, the PeCOD technique was innovatively utilized to resolve the BOD quantification issue under air bubble sample delivery conditions. The BFR was employed to effectively and efficiently biodegrade organic pollutants under oxygen-rich environment provided by the air bubbles. The BOD quantification was achieved by measuring the COD change (Δ[COD]) of the original sample and the effluent from BFR using PeCOD technique. The measured Δ[COD] was found to be directly proportional to the BOD5 values of the original sample with a slope independent of types and concentrations of organics. The slope was used to convert Δ[COD] to BOD5. The demonstrated analytical performance by BFR-PeCOD system surpasses all reported systems in many aspects. It has demonstrated ability to near real-time, online determining the organic pollution levels of wide range wastewaters without the need for dilution and ongoing calibration. The system possesses the widest analytical liner range (up to 800 mg O2 L(-1)) for BOD analysis, superior long-term stability, high accuracy, reliability, and simplicity. It is an environmentally friendly analytical system that consumes little reagent and requires minimal operational maintenance.
本工作开发了一种新型的生物膜反应器-光电化学需氧量（BFR-PeCOD）分析系统，用于快速在线测定可生物降解有机物（BOMs）。开发了一种新型的气泡样品输送方法，可显著提高 BFR 的生物降解效率并扩展分析线性范围。由于气泡输送的空气泡样品会使通过溶解氧探头测定耗氧量来定量 BOD 的方法失效，因此创新性地利用 PeCOD 技术解决了气泡输送条件下的 BOD 定量问题。BFR 可在气泡提供的富氧环境下有效且高效地降解有机污染物。通过使用 PeCOD 技术测定原样品和 BFR 流出物的 COD 变化（Δ[COD]）来实现 BOD 的定量。研究发现，所测的 Δ[COD]与原样品的 BOD5 值成正比，斜率与有机物的类型和浓度无关。斜率可用于将 Δ[COD]转换为 BOD5。BFR-PeCOD 系统的分析性能优于所有已报道的系统。它具有无需稀释和持续校准即可实时、在线测定各种废水有机物污染水平的能力。该系统具有最宽的 BOD 分析线性范围（高达 800mg O2 L(-1))，具有出色的长期稳定性、高精度、可靠性和简单性。它是一种环保型分析系统，试剂消耗少，操作维护要求低。
