Contrasting sludge toxicity under various starting modes (shocking or acclimating) and original organics (with or without N, N-dimethylformamide (DMF))

Chen, Xiurong; Zhao, Jian; Zhao, Jun; He, Ya‐Ling; Wang, Lu; Zheng, Bo

doi:10.1016/j.ibiod.2015.07.002

Cited by 24 publications

(6 citation statements)

References 30 publications

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“…Another important issue for the operation of biological DMF treatment process was the degradation pathway of the strains. The production of intermediate products, such as dimethylamine, could lead to secondary contamination if accumulating in sludge [30,31]. According to our study, it could be found that the intermediate products could be decomposed with longer reaction time.…”

Section: Dmf Removalmentioning

confidence: 61%

Microbial degradation of N,N-dimethylformamide by Paracoccus sp. strain DMF-3 from activated sludge

Zhou

Jin

Sun

et al. 2018

Chemical Engineering Journal

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N,N-dimethylformamide (DMF) was a typical toxic chemical and existed extensively in industrial wastewater. In this study, a strain of the high-efficient DMF degrading bacteria DMF-3 belonging to Paracoccus sp. was enriched and isolated from activated sludge. The removal rate of DMF by DMF-3 was up to 100% while 1000mg/L DMF was used as the sole carbon and nitrogen source. Growth kinetics model of DMF-3 was thus established, and the kinetic constants were determined with maximum specific growth rate μ max =0.22 (h-1), saturation constant Ks =0.41 (g/L) and inhibition constant Ki =25.93 (g/L). Based on the analysis of the intermediate products, it was found that DMF was firstly converted into dimethylamine and formic acid, and these intermediates were finally degraded to ammonia and carbon dioxide following the typical metabolic pathway of methylotrophs. In addition, to enhance the degrading capacity of DMF-3 in high DMF concentration, ultraviolet mutagenesis process was applied. Compared with the usage of the original strain of DMF-3, the degradation rate was increased by 14.8% with the usage of obtained mutant strain with applied initial DMF concentration 10000mg/L.

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Section: Dmf Removalmentioning

confidence: 61%

Microbial degradation of N,N-dimethylformamide by Paracoccus sp. strain DMF-3 from activated sludge

Zhou

Jin

Sun

et al. 2018

Chemical Engineering Journal

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“…. It showed that the proteins’ expression had much in common, such as proteins a, c, d and e, suggesting that many proteins co‐existed in both SBRs (Chen et al, ). However, compared to control SBR, proteins a and e had a significant overexpression after being acclimated with 4‐CP, and protein b only existed in acclimated SBR.…”

Section: Resultsmentioning

confidence: 99%

Effects of hydraulic retention time and proteins on sludge toxicity for 4‐chlorophenol wastewater treatment in sequencing batch reactors

Zhao

Chen

et al. 2018

Water & Environment J

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Due to the higher uncertainty of environmental risk for pollutants’ treatment by activated sludge, 10 mg/L influent 4‐chlorophenol (4‐CP) treated via a sequencing batch reactor (SBR) was used as acclimated SBR. Another SBR was used as control SBR without 4‐CP. The effects of hydraulic retention time (HRT) and proteins on sludge toxicity for 4‐CP treatment were analysed, and compared to the control SBR. Results showed that the sludge toxicity in acclimated SBR was significantly higher than that of the control SBR. Shortening HRT from 12 to 8 hours was beneficial to degrade 4‐CP and lower sludge toxicity. The identified highly expressed protein of ABC transporter co‐existed in control and acclimated SBRs, while other proteins of TonB‐dependent receptor, heat shock 70 kDa protein and superoxide dismutase in acclimated sludge were overexpressed relative to the control sludge, which played an important function in degrading 4‐CP, resisting 4‐CP toxicity and eliminating sludge toxicity.

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“…It was discovered that all the digested sludge exhibited toxicity to the soil bacterium Arthrobacter globiformist at concentrations about factor 100 higher than the usual application rate of sludge to soil in Europe. Chen, Zhao et al (2015) carried out a study in sludge toxicity determined by the inhibition of luminescence in the bacterium Photobacterium phosphoreum, which were formed during either acclimating or shocking starting processes with high concentration of N,N-dimethylformamide. It was found in the results that toxic substances accumulated in the sludge through various factors, including secretions from two types of sludge under N,N-dimethylformamide stress conditions.…”

Section: Sludge and Biosolidsmentioning

confidence: 99%

Health Effects Associated with Wastewater Treatment, Reuse, and Disposal

Qu,

Zhao,

et al. 2016

Water Environment Research

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A review of the literature published in 2015 on topics relating to public and environmental health risks associated with wastewater treatment, reuse, and disposal is presented. This review is divided into the following sections: wastewater management, microbial hazards, chemical hazards, wastewater treatment, wastewater reuse, agricultural reuse in different regions, greywater reuse, wastewater disposal, hospital wastewater, industrial wastewater, and sludge and biosolids.

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Contrasting sludge toxicity under various starting modes (shocking or acclimating) and original organics (with or without N, N-dimethylformamide (DMF))

Cited by 24 publications

References 30 publications

Microbial degradation of N,N-dimethylformamide by Paracoccus sp. strain DMF-3 from activated sludge

Microbial degradation of N,N-dimethylformamide by Paracoccus sp. strain DMF-3 from activated sludge

Effects of hydraulic retention time and proteins on sludge toxicity for 4‐chlorophenol wastewater treatment in sequencing batch reactors

Health Effects Associated with Wastewater Treatment, Reuse, and Disposal

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