Effect of prolonged sludge retention times on the performance of membrane bioreactor and microbial community for leachate treatment under restricted aeration

Ittisupornrat, Suda; Phetrak, Athit; Theepharaksapan, Suthida; Mhuantong, Wuttichai; Tobino, Tomohiro

doi:10.1016/j.chemosphere.2021.131153

Cited by 19 publications

(9 citation statements)

References 50 publications

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“…25 In contrast, this might also be the case because the amount of OLR was low, resulting in inadequate nutrients for bacterial growth. 17 As membrane cleaning was not performed throughout the experiment, the flux rate gradually decreased from 0.14 to 0.10 m 3 m −2 d −1 , possibly due to membrane fouling. This argument is supported by Jang et al, who explained that membrane fouling was accelerated by increasing pore blocking resistance at high salt concentrations.…”

Section: Resultsmentioning

confidence: 99%

“…The seed sludge sample was collected only at the start of the operation (day 0). The activated sludge samples were collected on days 17,38,49,59, and 73, corresponding to 5, 15, 15, 20, and 20 g L −1 NaCl loading in the saline MBR. All sludge samples were transported to the laboratory in an ice box, where they were stored at −20 °C until analysis.…”

Section: Sampling and Collection Of Water And Sludge Samplesmentioning

confidence: 99%

“…DNA extraction, sequencing, and data processing analysis Sludge samples taken from MBR were analyzed for their bacterial community using 16S-rRNA gene sequencing (Illumina Miseq sequencing). The DNA extraction and sequencing measurement were conducted following Ittisupornrat et al 17 Briefly, genomic DNA was extracted from each sample using the Taco TM Total DNA Extraction Kit (Gene Reach Biotechnology Corp., Taichung City 407, Taiwan). The purified DNA concentration was quantified using a UV-visible nano spectrophotometer (Nanodrop 2000, Thermo Fisher Scientific, MA, USA).…”

Section: Sampling and Collection Of Water And Sludge Samplesmentioning

confidence: 99%

“…14,15 The prominent advantage of the MBR is the ability to operate with high sludge retention to achieve high salinity tolerance, maintain slow-growing microorganisms, and resist shock loading capacity. 16,17 Jang et al studied the effects of salinity on sludge characteristics and membrane fouling using lab-scale MBR containing saline (5-20 g L −1 NaCl). 18 The results showed that increasing salinity negatively affects ammonium-N removal, but not for organic matter.…”

Section: Introductionmentioning

confidence: 99%

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Impact of saline valorization in contaminated municipal wastewater on the treatment performance and bacterial community dynamics of a membrane bioreactor

Ittisupornrat

Theepharaksapan

krasaesueb

et al. 2022

J of Chemical Tech & Biotech

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Background: Due to salt intrusion and the improper use of seawater for cleaning and flushing in food shops along coastal regions, the aerobic biological wastewater treatment process may have an adverse effect on treatment performance. This study demonstrates membrane bioreactor (MBR) performance for treating saline-contaminated municipal wastewater. The aim of this study is to determine how much salt affects the efficiency of the process and how the functional bacterial community evolves in an MBR for treating actual municipal wastewater.Results: An MBR was applied for actual municipal wastewater treatment by increasing the NaCl concentration from 0 to 20 g L −1 with a hydraulic retention time of 12 h and complete sludge retention. High removal efficiencies of chemical oxygen demand (COD) (ranging from 80.3 to 82.8 mgL −1 ) and ammonium-N (ranging from 40.8 to 44.4 mgL −1 ) were found at salinity concentrations of up to 7.8 ± 0.8 g L −1 . However, the removal efficiency of COD was below 50% at high salinity concentrations of 17.9 ± 1.3 g L −1 , whereas the removal rate of ammonium-N had slightly changed with the value of 90%. In terms of bacterial composition, the largest dominant bacterial communities were Proteobacteria and Planctomycetota, both of which may be the predominant halotolerant/halophilic bacteria group. Additionally, Rhizobiales, Planctomycetales, Pirellulales, and Gemmatales (all of which are members of these phyla) were increased, suggesting that they played an important role in the biodegradation process. Conclusion:The MBR operation showed a good performance for treating municipal wastewater with high salinity concentrations, with a salt tolerance threshold of 7.8 g L −1 . The experimental results indicate that the MBR system can be applied for treating municipal wastewater that is occasionally contaminated with seawater.

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Section: Resultsmentioning

confidence: 99%

Section: Sampling and Collection Of Water And Sludge Samplesmentioning

confidence: 99%

Section: Sampling and Collection Of Water And Sludge Samplesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Impact of saline valorization in contaminated municipal wastewater on the treatment performance and bacterial community dynamics of a membrane bioreactor

Ittisupornrat

Theepharaksapan

krasaesueb

et al. 2022

J of Chemical Tech & Biotech

Self Cite

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“…Leachate treatment includes biological processes, membrane separation methods, and advanced oxidation processes (Chen, Gu, et al, 2021;Ittisupornrat et al, 2021;Wu, Chen, et al, 2021). Among these methods, biological processes are most frequently adopted because of their stability and relatively low cost (Kurniawan et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Microbial community response of the full‐scale MBR system for mixed leachates treatment

Song

et al. 2022

Water Environment Research

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In practice, mature landfill leachate and incineration (young) leachate are mixed to improve the biodegradability and enhance biological treatment performance. However, the ratio of mature‐to‐young leachates greatly influences MBR treatment efficiency and microbial community structure. This study investigated the treatment efficiency and microbial community structure of full‐scale MBR systems operated under two mix ratios, mature leachate: young leachate = 7:3 (v/v, denoted as LL) and 3:7 (v/v, denoted as IL). LL group showed lower Cl− and COD concentrations but a higher aromatic organic content comparing to IL group, and the COD and UV254 removals for LL were significantly lower than those for IL by MBR treatment. Microbial community structures were similar in both groups at phylum level, with dominant phyla being Proteobacteria (23.8%–32.3%), Bacteroidetes (15.25%–20.7%), Chloroflexi (10.5%–23.1%), and Patescibacteria (9.9%–13.2%). However, the richness and diversity of LL group were lower, and differences were observed at lower taxonomy levels. Results indicated that salinity mainly changed the structure of microbial community, resulting in greater abundance of salt‐tolerant microbials, while refractory organics affected microbial community structure, and also led to decreased diversity and metabolic activity. Therefore, in mixed leachates biological treatment, a higher young leachate ratio is recommended for better organics removal performance. Practitioner Points The trade‐off between refractory organics and salinity in mixed leachate treatment should be paid attention. Refractory organics reduced alpha and functional diversities of microorganisms. Mixed leachate with a higher young leachate ratio reached a better organic removal.

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Physico-chemical characteristics of leachate from landfills and its impact on surface water quality: case study in Osmaniye/Turkey

Karagozoglu,

Asar

2023

Sustain. Water Resour. Manag.

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Effect of prolonged sludge retention times on the performance of membrane bioreactor and microbial community for leachate treatment under restricted aeration

Cited by 19 publications

References 50 publications

Impact of saline valorization in contaminated municipal wastewater on the treatment performance and bacterial community dynamics of a membrane bioreactor

Impact of saline valorization in contaminated municipal wastewater on the treatment performance and bacterial community dynamics of a membrane bioreactor

Microbial community response of the full‐scale MBR system for mixed leachates treatment

Physico-chemical characteristics of leachate from landfills and its impact on surface water quality: case study in Osmaniye/Turkey

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