Effect of calcium peroxide on the water quality and bacterium community of sediment in black-odor water.

Autor: Wang WH; School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, China., Wang Y; School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, China. Electronic address: wangyi1003@xauat.edu.cn., Fan P; School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, China., Chen LF; School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, China., Chai BH; School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, China., Zhao JC; College of Chemistry & Materials Science, Northwest University, Xi'an, 710069, China., Sun LQ; Environmental Science Department, University of San Francisco, California, CA, 94117, USA.
Jazyk: angličtina
Zdroj: Environmental pollution (Barking, Essex : 1987) [Environ Pollut] 2019 May; Vol. 248, pp. 18-27. Date of Electronic Publication: 2018 Nov 23.
DOI: 10.1016/j.envpol.2018.11.069
Abstrakt: This study investigated how efficiently CaO 2 could treat black-odor landscape water caused by low dissolved oxygen (DO) in a field experiment of 600 m 2 . The study demonstrated that CaO 2 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 2- 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 2- in the overlying and interstitial waters of TZ were 29.63% and 39.79% of those of CZ. Meanwhile, CaO 2 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 2 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 2 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 2 .
(Copyright © 2018. Published by Elsevier Ltd.)
Databáze: MEDLINE
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