School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, China.
School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, China; Tianjin Engineering Research Center of Urban River Eco-Purification Technology, Tianjin 300350, China.
Bioresour Technol. 2017 May;232:278-284. doi: 10.1016/j.biortech.2017.01.076. Epub 2017 Feb 11.
A spiral fiber based biofilm reactor was developed to remove nitrate and chromate simultaneously. The denitrification and Cr(VI) removal efficiency was evaluated with synthetic groundwater (NO-N=50mg/L) under different Cr(VI) concentrations (0-1.0mg/L), carbon nitrogen ratios (C/N) (0.8-1.2), hydraulic retention times (HRT) (2-16h) and initial pHs (4-10). Nitrate and Cr(VI) were completely removed without nitrite accumulation when the Cr(VI) concentration was lower than 0.4mg/L. As Cr(VI) up to 1.0mg/L, the system was obviously inhibited, but it recovered rapidly within 6days due to the strong adaption and domestication of microorganisms in the biofilm reactor. The results demonstrated that high removal efficiency of nitrate (≥99%) and Cr(VI) (≥95%) were achieved at lower C/N=0.9, HRT=8h, initial pH=7, and Cr(VI)=1.0mg/L. The technology proposed in present study can be alternative for simultaneous removal of co-contaminants in groundwater.
一种基于螺旋纤维的生物膜反应器被开发出来，用于同时去除硝酸盐和铬酸盐。在不同的六价铬浓度（0-1.0mg/L）、碳氮比（C/N）（0.8-1.2）、水力停留时间（HRT）（2-16h）和初始 pH 值（4-10）下，用合成地下水（NO-N=50mg/L）评估了反硝化和 Cr(VI)去除效率。当六价铬浓度低于 0.4mg/L 时，硝酸盐和 Cr(VI)可完全去除，且没有亚硝酸盐积累。当六价铬浓度达到 1.0mg/L 时，系统受到明显抑制，但由于生物膜反应器中微生物的强适应性和驯化，在 6 天内迅速恢复。结果表明，在较低的 C/N=0.9、HRT=8h、初始 pH=7 和 Cr(VI)=1.0mg/L 条件下，可实现硝酸盐（≥99%）和 Cr(VI)（≥95%）的高效去除。本研究提出的技术可作为地下水共污染物去除的替代方法。
