School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, China.
School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, China.
Environ Pollut. 2019 May;248:18-27. doi: 10.1016/j.envpol.2018.11.069. Epub 2018 Nov 23.
This study investigated how efficiently CaO could treat black-odor landscape water caused by low dissolved oxygen (DO) in a field experiment of 600 m. The study demonstrated that CaO could significantly elevate the DO concentration in waters and the oxidation-reduction potential (ORP) level in sediments (p = 0.003 and p = 0), which is conducive to improving the anoxic environment of landscape water. The concentrations of total chemical oxygen demand (TCOD) and S in overlying and interstitial waters were considerably decreased. The average concentrations of TCOD in the overlying and interstitial waters of the test zone (TZ) were 52.98% and 66.05% of those of the control zone (CZ), and the average concentrations of S in the overlying and interstitial waters of TZ were 29.63% and 39.79% of those of CZ. Meanwhile, CaO could obviously reduce turbidity but increase the transparency in the overlying water. The mean value of turbidity in the overlying water of TZ was 39.46% of that of CZ, whereas the transparency in the overlying water of TZ was 2.07 times that of CZ. Furthermore, CaO changed the microbial community structure in the sediments, where the relative abundance of anaerobic bacteria was decreased but that of the aerobic bacteria was increased with some functional bacteria. In summary, CaO could significantly increase the DO and ORP in black-odor landscape water, obviously inhibit the release of pollutants from sediment, and increase the diversity of microbial strains. Consequently, the black-odor phenomenon of landscape water could be alleviated effectively by adding CaO.
本研究通过 600m 的野外试验，考察了 CaO 处理低溶解氧（DO）引起的黑臭景观水的效率。研究表明，CaO 能显著提高水中 DO 浓度和沉积物氧化还原电位（ORP）水平（p=0.003 和 p=0），有利于改善景观水缺氧环境。上覆水和间隙水中的总化学需氧量（TCOD）和 S 浓度明显降低。试验区（TZ）上覆水和间隙水中的 TCOD 平均浓度分别为对照区（CZ）的 52.98%和 66.05%，而 TZ 上覆水和间隙水中的 S 平均浓度分别为 CZ 的 29.63%和 39.79%。同时，CaO 能明显降低上覆水浊度但增加透明度。TZ 上覆水浊度的平均值为 CZ 的 39.46%，而 TZ 上覆水的透明度是 CZ 的 2.07 倍。此外，CaO 改变了沉积物中的微生物群落结构，其中厌氧菌的相对丰度降低，而好氧菌的相对丰度增加，同时一些功能菌的相对丰度也增加。综上所述，CaO 能显著提高黑臭景观水中的 DO 和 ORP，明显抑制沉积物中污染物的释放，增加微生物菌株的多样性。因此，通过添加 CaO 可有效缓解景观水的黑臭现象。
