Abstract
The phenomenon of black-odor urban rivers with rapid urbanization has attracted extensive attention. In this study, we investigated the water quality and composition of sediment-associated bacteria communities in three remediation stages (before remediation, 30 days after remediation, and 90 days after remediation) based on the in situ remediation using comprehensive measures (physical, chemical, and biological measures). The results show that the overlying water quality was notably improved after in situ remediation, while the diversity and richness of sediment-associated bacterial communities decreased. A growing trend of some dominant genus was observed following the remediation of a black-odor river, such as Halomonas, Pseudomonas, Decarbonamis, Leptolina, Longilina, Caldiseericum, Smithella, Mesotoga, Truepera, and Ralstonia, which play an important role in the removal of nitrogen, organic pollutants and hydrogen sulfide (H2S) during the sediment remediation. Redundancy analysis (RDA) showed that the bacterial community succession may accelerate the transformation of organic pollutants into inorganic salts in the sediment after in situ remediation. In a word, the water quality of the black-odor river was obviously improved after in situ remediation, and the bacterial community in the sediment notably changed, which determines the nutrients environment in the sediment.
Highlights
Black-odor water is a body of water that emits an irritating and noxious smell, appears black or grayish black, and loses ecological function [1,2,3]
19.5 mg/L to 2.1 mg/L, total phosphorus (TP) decreased from 11.3 mg/L to 0.3 mg/L, and chemical oxygen demand (COD) decreased from 173.7 mg/L to 24.1 mg/L (Figure 1)
Available P, TP, ammonium, total nitrogen (TN), nitrate, organic matter (OM), and sulfate in DBR1 were significantly lower than DBR2 and DBR3, of which TP, nitrate, TN, OM and sulfate significantly decreased from
Summary
Black-odor water is a body of water that emits an irritating and noxious smell, appears black or grayish black, and loses ecological function [1,2,3]. This phenomenon often occurs because a large amount of organic pollutants flowing into the water, accelerating the consumption of dissolved oxygen, and making the river anaerobic [2]. In China, Water 2019, 11, 2129; doi:10.3390/w11102129 www.mdpi.com/journal/water
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