Investigation of microbial adaptation to salinity variation for treatment of reverse osmosis concentrate by membrane bioreactor

Jang, Duksoo; Moon, Christina H.; Ahn, Kyu‐Hong; Shin, Hang‐Sik; Hwang, Yuhoon

doi:10.1080/19443994.2014.960464

Cited by 2 publications

(3 citation statements)

References 14 publications

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“…It is interesting to notice that the R COD climbed up to maximum (71.52 %) while the COD of MBR effluent decreased to minimum (277.5 mg/L) at the R cb of 60 %. This phenomenon suggests that the activated sludge in MBR adapted to the salt induced stress brought by the NF concentrate after acclimatization, or even stimulated to a higher COD removal efficiency (Jang et al 2014;Rene et al 2008). However, when the R cb increased to 80 and 90 %, the R COD decreased to approximately 48 %, indicating that it might need a longer time for the activated sludge to readapt to the environmental conditions at high R cb s. In contrast to the variation of R COD , the NH 4 + -N removal rate (R NH4+ ) was steadily higher than 95 % throughout the entire experiment, and the NH 4 + -N concentration in the effluent remained below 14 mg/ L. Similar to the tendency of COD removal efficiency, the optimum efficiency of NH 4 + -N removal was also achieved at the R cb of 60 %.…”

Section: Resultsmentioning

confidence: 99%

“…2a, the repeated rising and declining trends of both the f and the SOUR values indicated that the MBR sludge had undergone a process of decomposition and regrowth. The MBR sludge presented a delayed response to the change of R cb , and it could finally well adapt to the environmental changes caused by the NF concentrate when the operational duration was long enough (Jang et al 2014;Rene et al 2008). No sludge was discharged during the experiment with the R cb increased from 0 to 90 %, which unavoidably led to a salt accumulation in MBR (Table S3 and Table S5, SI).…”

Section: Sour and Mlvss/mlss Ratiomentioning

confidence: 97%

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Effects of returning NF concentrate on the MBR-NF process treating antibiotic production wastewater

Cheng

Jianxing

et al. 2016

Environ Sci Pollut Res

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The optimization of the nanofiltration (NF) concentrate backflow ratio (R cb ) and the influence of the NF concentrate on the performance of membrane bioreactornanofiltration (MBR-NF) process treating antibiotic production wastewater were investigated on a laboratory scale. The R cb was optimized at 60 % based on the removal rates of chemical oxygen demand (COD) and NH 4 + -N by MBR. Data analyses indicated that salinity brought by NF concentrate is the major driver leading to the decrease of sludge activity, especially at a high R cb . EPS analysis showed that electric conductivity (EC), proteins in soluble microbial products (SMP), and SMP brought by NF concentrate are the dominant factors causing the severe membrane fouling in MBR. Furthermore, undegradable substances including fulvic acid-like and humic acid-like compounds accumulated in NF concentrate showed significant influence on fouling of NF. MBR could well degrade small MW compounds in NF concentrate, which confirmed the enhancement of organic removal efficiency by recycling the NF concentrate to MBR. The MBR-NF process showed a relatively stable performance at the R cb of 60 % (volume reduction factor (VRF) = 5), and the NF permeate could satisfy the water quality standard for fermentation process with a water recovery rate of 90.9 %.

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Section: Resultsmentioning

confidence: 99%

Section: Sour and Mlvss/mlss Ratiomentioning

confidence: 97%

Effects of returning NF concentrate on the MBR-NF process treating antibiotic production wastewater

Cheng

Jianxing

et al. 2016

Environ Sci Pollut Res

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“…In a previous study, we conducted research on the microbial acclimation strategy for saline wastewater. 25,26 It was shown that the negative effect of salt could be minimized by step-wise acclimation of microbes without using any special halophilic bacteria. The microbial acclimation brought changes of microbial communities simultaneously.…”

Section: Introductionmentioning

confidence: 99%

Importance of microbial adaptation for concentrate management in wastewater reuse process

Moon

Ahn

Lee

et al. 2018

Energy & Environment

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Wastewater reuse has gained attention as an alternative and sustainable water resource. Reverse osmosis has been widely applied for wastewater reuse; however, generation of concentrate stream is the main drawback. Concentrate stream contains high concentrations of contaminants, and therefore, it should be properly treated prior to being discharged into a water body. Several technologies have been suggested for concentrate management, but the most common option is returning this stream to a wastewater treatment plant where a wastewater reuse plant is located. In this study, we investigated the feasibility of concentrate management by returning the concentrate to a wastewater treatment facility as a part of influent. The characteristics of the concentrate were extensively monitored, and it was verified that it contained high concentrations of salt and hardly biodegradable organics, which impede their application in biological wastewater treatment processes. The effect of seeding sludge was investigated using two different types of seeding sludge, adapted and unadapted. The adapted sludge taken at the wastewater treatment plant located at the wastewater reuse facility showed much better performance in terms of organic and nutrients removal. Moreover, the performance was recovered by a few days of additional adaptation time. However, the seeding sludge taken from another wastewater treatment plant (unadapted) showed poor performance due to different influent characteristics, especially salt concentration. Therefore, it could be concluded that the microbial adaptation step is very important for effective concentrate treatment when it is being returned to a wastewater plant as influent.

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Investigation of microbial adaptation to salinity variation for treatment of reverse osmosis concentrate by membrane bioreactor

Cited by 2 publications

References 14 publications

Effects of returning NF concentrate on the MBR-NF process treating antibiotic production wastewater

Effects of returning NF concentrate on the MBR-NF process treating antibiotic production wastewater

Importance of microbial adaptation for concentrate management in wastewater reuse process

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