School of Civil, Environmental and Chemical Engineering, Water: Effective Technologies and Tools Centre, RMIT University, Melbourne, Australia E-mail:
Water Sci Technol. 2013;68(9):1994-9. doi: 10.2166/wst.2013.417.
The UVC/H(2)O(2) process was studied at laboratory scale for the treatment of one moderate (conductivity ∼8 mS/cm) and two high salinity (∼23 mS/cm) municipal wastewater reverse osmosis concentrate (ROC) samples with varying organic and inorganic characteristics. The process efficiency was characterized in terms of reduction of dissolved organic carbon (DOC), chemical oxygen demand (COD), colour and absorbance at 254 nm (A(254)), and the improvement of biodegradability. The reduction of colour and A(254) was significantly greater than for DOC and COD for all samples due to the greater breakdown of humic compounds, as confirmed by fluorescence excitation-emission matrix spectra. Fairly small differences in the reduction of DOC (26-38%) and COD (25-37%) were observed for all samples, suggesting that the salinity of the ROC did not have a significant impact on the UVC/H(2)O(2) treatment under the test conditions. The biodegradability of the treated ROC samples improved markedly (approximately 2-fold) after 60 min UVC/H(2)O(2) treatment. This study indicates the potential of UVC/H(2)O(2) treatment followed by biological processes for treating high-salinity concentrate, and the robustness of the process where the characteristics of the secondary effluent (influent to RO) and thus resultant ROC vary significantly.
采用实验室规模研究了 UVC/H(2)O(2)工艺处理具有不同有机和无机特性的 1 种中等含盐量（电导率约为 8 mS/cm）和 2 种高含盐量（约 23 mS/cm）的市政反渗透浓缩液（ROC）。通过测量溶解性有机碳（DOC）、化学需氧量（COD）、色度和 254nm 吸光度（A(254)）的降低以及可生化性的提高来评价工艺效率。由于腐殖质化合物的分解，所有样品的色度和 A(254)的降低明显大于 DOC 和 COD，这一点通过荧光激发-发射矩阵光谱得到了证实。所有样品的 DOC（26-38%）和 COD（25-37%）的降低差异很小，这表明在测试条件下，ROC 的盐度对 UVC/H(2)O(2)处理没有显著影响。经过 60 分钟 UVC/H(2)O(2)处理后，处理后的 ROC 样品的可生化性明显提高（约 2 倍）。该研究表明，UVC/H(2)O(2)处理后采用生物过程处理高含盐浓缩液具有潜力，而且该工艺具有很好的抗干扰性，因为 RO 的进水（二级出水）特性和相应的 ROC 变化很大。
