Effect of cadmium on the performance of partial nitrification using sequencing batch reactor

Zhang, Liqiu; Fan, Jie; Nguyen, Hang N.; Li, Shugeng; Rodrigues, Débora F.

doi:10.1016/j.chemosphere.2019.02.006

Cited by 47 publications

(12 citation statements)

References 53 publications

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“…However, the inhibition threshold of Zn(II) and Cd(II) on AOB were both reported as 10 mg L −1 , and the partial nitrification sludge presented a good adsorption to Zn(II) and Cd(II). 24,31 Therefore, it can be speculated that the existence of AOB may adsorb partial heavy metals and relieve its toxicity to AAOB, which contributed to the better resistant ability of CANON process to Zn (II) and Cd(II).…”

Section: Resultsmentioning

confidence: 99%

“…However, previous studies reported that the abundance of AAOB and TNRE were both significant with the addition of 1 mg L −1 Zn(II) and Cd(II) in Anammox system. 24,31 It indicated the micro-oxygen environment and the existence of AOB can share and relieve the toxicity of heavy metals on AAOB. This is why CANON system presented a better stability than Anammox system.…”

Section: Variation Of Eps Concentrationmentioning

confidence: 99%

“…In this study, the abundance of Proteobacteria significantly increased to the highest wileyonlinelibrary.com/jctb 61.3% when compared to the other reactors. Many kinds of heavy metals resistant genera belong to Bacteroidetes and Proteobacteria phylum, such as Thauera, 31 which accounted for 1.4% in R6. Therefore, the accumulation of mixed heavy metals developed some new microorganisms that tolerate them.…”

Section: Variation Of Eps Concentrationmentioning

confidence: 99%

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Feasibility of CANON process for treating nitrogenous wastewater containing heavy metals

Zhao

Zhang

Li³

et al. 2020

J of Chemical Tech & Biotech

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The appearance of heavy metals in wastewater brings a major burden to wastewater treatment plants, due to the high toxicity to microorganisms. Several commonly used heavy metals, including Zn(II), Cd(II), Hg(II), and Pb(II) were adopted to clear the individual and joint toxicity to the completely autotrophic nitrogen removal over nitrite (CANON) process in six sequencing batch reactors. The obtained results suggested that the nitrogen removal performances were transiently inhibited, but rapidly recovered. The restoration period under the stress of Hg(II) and Pb(II) was shorter than that under Zn(II), Cd(II), and the joint heavy metals. During the long-term exposure, Cd(II) in 1mg L −1 slightly inhibited the nitrogen removal, while Zn(II), Hg(II), Pb(II), and mixture showed a negligible impact on CANON process. The defense of extracellular polymeric substances (EPS), the good adaptability of functional bacteria, and the inducement of resistant genera by heavy metals all contributed to the robustness and stability of CANON process. Therefore, it is feasible to treat nitrogenous wastewater containing low heavy metals using CANON process.

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Section: Resultsmentioning

confidence: 99%

Section: Variation Of Eps Concentrationmentioning

confidence: 99%

Section: Variation Of Eps Concentrationmentioning

confidence: 99%

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Feasibility of CANON process for treating nitrogenous wastewater containing heavy metals

Zhao

Zhang

Li³

et al. 2020

J of Chemical Tech & Biotech

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“…Heavy metal contamination is a common factor that affects built ecosystems in WWTPs [ 1 , 3 , 8 , 9 ]. Studying the response of these ecosystems and microbiomes therein during heavy metal exposure can elucidate key features involved in microbial adaptation to toxicants and improve the ecosystem robustness for wastewater treatment.…”

Section: Discussionmentioning

confidence: 99%

“…Due to the presence of anaerobic and anoxic phases, DPRS exhibits greater nitrification capacity and phosphorus removal performance than activated sludge [ 6 ]. But heavy metals can cause dysfunctions of proteins and inhibit microbial activities such as nitrification [ 7 , 8 ] and eventually attenuate the treatment efficiency [ 5 , 9 ]. Thus, a better understanding of the heavy metal-resistance strategies adopted by DPRS microbiomes might ultimately improve their robustness for nutrient removal.…”

Section: Introductionmentioning

confidence: 99%

Revealing taxon-specific heavy metal-resistance mechanisms in denitrifying phosphorus removal sludge using genome-centric metaproteomics

Lin

Wang

et al. 2021

Microbiome

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Background Denitrifying phosphorus removal sludge (DPRS) is widely adopted for nitrogen and phosphorus removal in wastewater treatment but faces threats from heavy metals. However, a lack of understanding of the taxon-specific heavy metal-resistance mechanisms hinders the targeted optimization of DPRS’s robustness in nutrient removal. Results We obtained 403 high- or medium-quality metagenome-assembled genomes from DPRS treated by elevating cadmium, nickel, and chromium pressure. Then, the proteomic responses of individual taxa under heavy metal pressures were characterized, with an emphasis on functions involving heavy metal resistance and maintenance of nutrient metabolism. When oxygen availability was constrained by high-concentration heavy metals, comammox Nitrospira overproduced highly oxygen-affinitive hemoglobin and electron-transporting cytochrome c-like proteins, underpinning its ability to enhance oxygen acquisition and utilization. In contrast, Nitrosomonas overexpressed ammonia monooxygenase and nitrite reductase to facilitate the partial nitrification and denitrification process for maintaining nitrogen removal. Comparisons between phosphorus-accumulating organisms (PAOs) demonstrated different heavy metal-resistance mechanisms adopted by Dechloromonas and Candidatus Accumulibacter, despite their high genomic similarities. In particular, Dechloromonas outcompeted the canonical PAO Candidatus Accumulibacter in synthesizing polyphosphate, a potential public good for heavy metal detoxification. The superiority of Dechloromonas in energy utilization, radical elimination, and damaged cell component repair also contributed to its dominance under heavy metal pressures. Moreover, the enrichment analysis revealed that functions involved in extracellular polymeric substance formation, siderophore activity, and heavy metal efflux were significantly overexpressed due to the related activities of specific taxa. Conclusions Our study demonstrates that heavy metal-resistance mechanisms within a multipartite community are highly heterogeneous between different taxa. These findings provide a fundamental understanding of how the heterogeneity of individual microorganisms contributes to the metabolic versatility and robustness of microbiomes inhabiting dynamic environments, which is vital for manipulating the adaptation of microbial assemblages under adverse environmental stimuli.

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Toxic Effects of Xenobiotic Compounds on the Microbial Community of Activated Sludge

et al. 2022

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The presence of xenobiotic compounds in biological wastewater treatment processes with activated sludge may reduce microbial communities, disrupt microbial diversity, and diminish system performance. Shock loads and unusual operating events in these biological systems have negative impacts on their efficiency and reliability for pollutant degradation, thereby posing high risk to microorganisms and water quality of receiving treated water bodies. The severity and characteristics of the occurring damage are determined by the toxic contaminant's degree, nature and mode of application. This review highlights the effects of metabolic uncouplers, heavy metals, carbon nanotubes, pharmaceuticals and personal care products, nanoparticles, and phenolic compounds stress on microbial biomass in activated sludge systems. The synergistic, antagonistic, and shock load toxic effects of hybrid substances exposure in an activated sludge sequential batch reactor (SBR) system on organic and nutrient removal, system efficiency, and toxicants biodegradation are discussed. The findings can be used to provide a theoretical foundation and professional assistance for optimizing the shock impacts of these toxic substances on biological wastewater treatment systems, which will help to reduce their negative effects on treatment system efficiency.

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Effect of cadmium on the performance of partial nitrification using sequencing batch reactor

Cited by 47 publications

References 53 publications

Feasibility of CANON process for treating nitrogenous wastewater containing heavy metals

Feasibility of CANON process for treating nitrogenous wastewater containing heavy metals

Revealing taxon-specific heavy metal-resistance mechanisms in denitrifying phosphorus removal sludge using genome-centric metaproteomics

Toxic Effects of Xenobiotic Compounds on the Microbial Community of Activated Sludge

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