Evaluation of sludge reduction of three metabolic uncouplers in laboratory-scale anaerobic–anoxic–oxic process

Li, Ping; Li, Hechao; Jin, Li; Guo, Xuesong; Liu, Junxin; Xiao, Benyi

doi:10.1016/j.biortech.2016.09.019

Cited by 27 publications

(15 citation statements)

References 33 publications

(62 reference statements)

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“…In the literature, three mechanisms of sludge reduction, namely maintenance metabolism, uncoupled metabolism and lysis–cryptic growth, are discussed. Alterations in ETS activity, SATP, and EPS content in the activated sludge culture as well as the protein and DNA contents in activated sludge supernatants have been widely used in the evaluation of metabolic uncoupling, metabolism, and lysis–cryptic growth [32,33]. We measured these parameters of the activated sludge in this study at different concentrations (0, 0.6, 1, 1.5, 3, 6, and 12 mg/L) of TCS, and the summary of the results is demonstrated in Figure 3 and Figure 4.…”

Section: Resultsmentioning

confidence: 99%

Assessment of the Sludge Reduction of the Metabolic Uncoupler 3,3′,4′,5-tetrachlorosalicylanilide (TCS) in Activated Sludge Culture

Yang

Wei

et al. 2019

IJERPH

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Batch experiments were completed to assess the sludge reduction of the metabolic uncoupler 3,3′,4′,5-tetrachlorosalicylanilide (TCS). The effects of various TCS concentrations on sludge yield were evaluated and the mechanisms associated with sludge reduction were assessed. We discovered that TCS addition resulted in a reduction in sludge. Furthermore, a low dose of TCS (≤3 mg/L) resulted in a slight reduction in the efficiency of the wastewater treatment system, while >3 mg/L TCS reduced matrix removal efficiency, with an especially remarkable inhibition effect on ammonia removal. An increase in TCS addition was associated with a gradual decrease in both the electron transport system (ETS) activity and the specific cellular ATP (SATP) in the TCS system. It was demonstrated that TCS plays an important role in metabolic uncoupling. However, with the addition of TCS, both contents and compositions were increased, and the protein content increased more than polysaccharide production in extracellular polymeric substances (EPS). At TCS concentrations of ≤3 mg/L, DNA content was stable, but it increased rapidly from 4.97 mg/L to 15.34 mg/L as the TCS concentration was elevated from 6 mg/L to 12 mg/L. This implied that the mechanisms of sludge reduction were different for different TCS concentrations, including uncoupling metabolism, maintenance metabolism and lysis–cryptic growth.

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Section: Resultsmentioning

confidence: 99%

Assessment of the Sludge Reduction of the Metabolic Uncoupler 3,3′,4′,5-tetrachlorosalicylanilide (TCS) in Activated Sludge Culture

Yang

Wei

et al. 2019

IJERPH

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“…Table 4 shows the breakage and recovery factors for four occulants at the optimal dosage. The breakage factor and recovery factor were calculated by eqn (3) and 4, respectively, which were mentioned before in Section 2.3. It can be seen that the introduction of the cationic microblock structure effectively increased both the breakage factor and the recovery factor.…”

Section: Floc Propertiesmentioning

confidence: 99%

“…1,2 The large quantities of WAS are a troublesome by-product of wastewater treatment plants (WWTPs), which need to be appropriately handled; otherwise, they could lead to serious environmental impacts. 3 In China, the current production of dewatered WAS is greater than 3.0 Â 10 7 tons (with a water content of 80%) and is expected to continue to increase owing to the stricter environmental regulations and growing amounts of wastewater. 4,5 The management of WAS represents a considerable portion of the total operating costs of WWTPs and also causes a great economic burden.…”

Section: Introductionmentioning

confidence: 99%

Waste activated sludge (WAS) dewatering properties of an original hydrophobically modified polyacrylamide containing a cationic microblock structure

et al. 2017

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“…It should be realized currently that finding out the efficient and eco-friendly methods to minimize excess sludge production is of great importance. Recently, researchers (Nazif et al, 2016;Li et al, 2016;Raj et al, 2013) achieved successfully excess sludge reduction (20-70%) using oxic-settling-anoxic (OSA) system, metabolic uncouplers and anaerobic/anoxic/oxic (AAO) system. However, these methods cannot avoid the drawbacks such as additional capital, operating costs, and potentially environmental impact as a part of chemical uncouplers are difficult to metabolic and will cause uncertain effects on human health eventually.…”

Section: Introductionmentioning

confidence: 99%

Use of magnetic powder to effectively improve the performance of sequencing batch reactors (SBRs) in municipal wastewater treatment

Liu

Guo

et al. 2018

Bioresource Technology

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This study aims to investigate the effect of adding magnetic powder in the sequencing batch reactor (SBR) on the reactor performance and microbial community. Results indicated that, the magnetic activated sludge sequencing batch reactor (MAS-SBR) had 7.76% and 4.76% higher ammonia nitrogen (NH-N) and chemical oxygen demand (COD) removal efficiencies than that of the conventional SBR (C-SBR). The MAS-SBR also achieved 6.86% sludge reduction compared with the C-SBR. High-throughput sequencing demonstrated that the dominant phyla of both SBRs (present as ≥1% of the sequence reads) were Protebacteria, Bacteroidetes, Chloroflexi, Saccharibacteria, Chlorobi, Firmicutes, Actinobactoria, Acidobacteria, Planctomycetes and unclassified_Bacteria. The relative abundance of Protebacteria and Bacteroidetes simultaneously declined whereas the other 8 phyla increased following the addition of magnetic powder. Adding magnetic powder in the SBR significantly affected the microbial diversity and richness of activated sludge, consequently affecting the reactor performance.

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Evaluation of sludge reduction of three metabolic uncouplers in laboratory-scale anaerobic–anoxic–oxic process

Cited by 27 publications

References 33 publications

Assessment of the Sludge Reduction of the Metabolic Uncoupler 3,3′,4′,5-tetrachlorosalicylanilide (TCS) in Activated Sludge Culture

Assessment of the Sludge Reduction of the Metabolic Uncoupler 3,3′,4′,5-tetrachlorosalicylanilide (TCS) in Activated Sludge Culture

Waste activated sludge (WAS) dewatering properties of an original hydrophobically modified polyacrylamide containing a cationic microblock structure

Use of magnetic powder to effectively improve the performance of sequencing batch reactors (SBRs) in municipal wastewater treatment

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