Mechanism of aerobic denitrifiers and calcium nitrate on urban river sediment remediation

Effect of Remediation Reagents on Bacterial Composition and Ecological Function in Black-Odorous Water Sediments

“…improving the oxidation conditions of sediments, providing electron acceptors for microorganisms (such as denitri cation bacteria) to accelerate their organic matter degradation activity, and controlling the diffusion of nitrogen and phosphorus nutrients to the overlying water body (Liu et al 2017;Tang et al 2018). Magnesium hydroxide (Mg(OH) 2 ), which can turn the sediment environment weakly alkaline and affect the metabolic activity of SRB and other microorganisms related to black-odorous water, as well as the production of black-malodorous substances, has been proposed as a new environmentally friendly remediation reagent for sediment puri cation in marine cage culture in Japan (Nishino and Kawauchi 2003).…”

Assessment of Calcium Nitrate Addition on the AVS Removal, Phosphorus Locking, and Pb Release in Sediment

“…In addition, it was found that the 1.5× treatment had the lowest O-P proportion of all samples on the 10th day, which was only 7.7%. Some previous studies showed that adding CN in the sediment can lead to an increase in microbial activity, and convert organic pollutants to low molecular weight compounds (Harada et al, 2014;Tang et al, 2018). This might be the main reason for the decrease of O-P proportion in the treatments.…”

“…This might be the main reason for the form of flocculation in the sediment surface. Since Ripl first discovered in 1976 that the addition of calcium nitrate was useful for sediment remediation (Ripl, 1976), many studies on the effect of nitrate on sediment remediation and water environment had been carried out all over the world (Babin et al, 1998;Liu et al, 2014;Tang et al, 2018;Wang et al, 2016;Yamada et al, 2012).…”

“…In recent years, many studies have combined nitrate with other treatment methods and adopted a comprehensive treatment method for blackwater to give full play to the advantages of nitrate in the treatment of black water, while avoiding and eliminating disadvantages. Tang et al combined calcium nitrate and aerobic denitrification bacteria to repair urban polluted river sediments, effectively improving the biodegradability of nitrogen and organic matter, and increasing the microbial diversity in sediments (Tang et al, 2018). In order to reduce the ecological risk caused by the application of calcium nitrate, Li et al used low-dose calcium nitrate combined with lowoxygen aeration technology to repair the black and odorous bottom mud.…”

Characteristics and Driving Factors of the Aerobic Denitrifying Microbial Community in Baiyangdian Lake, Xiong’an New Area

“…Currently, some full-scale experiments on bioaugmentation with aerobic denitrification bacteria have been conducted successfully for the remediation of wastewater, urban river, and river sediment. Such as, Duan et al (2015) explored the nitrogen removal performance of halophilic heterotrophic nitrification-aerobic denitrification SF-16 in saline wastewater [13]; Du et al (2017) investigated the variation of bacterial community structure in an aerobic denitrification reactor of industrial wastewater [14]; Sun et al (2018) achieved the bioremediation of sediment through the aerobic denitrification agent in an urban river [1] and evaluated the mechanism of aerobic denitrifying bacteria [15]. Comparison of bioaugmentation in wastewater, urban rivers, and urban sediments has shown that there is limited information on the addition of inoculated bacteria or enhancement of indigenous aerobic denitrification bacteria in situ in natural water ecosystems.…”