Formation of disinfection by-products during sodium hypochlorite cleaning of fouled membranes from membrane bioreactors

Wang, Hao; Ma, Defang; Shi, Weiye; Yang, Zhiyu; Cao, Yun; Gao, Baoyu

doi:10.1007/s11783-021-1389-3

Cited by 27 publications

(12 citation statements)

References 37 publications

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“…On day 17, after cleaning with NaClO solution, the TMP rapidly decreased to 2.1 kPa, which is attributed to the strong oxidation property of NaClO solution that can oxidize the membrane surface and its internal pores. NaClO solution can oxidize the microscopic impurities inside the membrane pores, reduce the membrane pressure, and improve the membrane flux recovery [ 29 ]. The membrane effluent reached up to 200 L during the subsequent experiments, but the membrane pressure did not increase until the end of the experiment; a TMP of 5.2 kPa was achieved, and the development rate of TMP in the second stage was significantly reduced to 0.28 kPa/d.…”

Section: Resultsmentioning

confidence: 99%

Pilot Scale Application of a Ceramic Membrane Bioreactor for Treating High-Salinity Oil Production Wastewater

Sun

Jin

2022

Membranes

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The offshore oil extraction process generates copious amounts of high-salinity oil-bearing wastewater; at present, treating such wastewater in an efficient and low-consumption manner is a major challenge. In this study, a flat ceramic membrane bioreactor (C−MBR) process combining aerobic microbial treatment technology and ceramic membrane filtration technology was used to treat oil-bearing wastewater. The pilot test results demonstrated the remarkable performance of the combined sequential batch reactor (SBR) and C-MBR process, wherein the chemical oxygen demand (COD) and ammonia nitrogen (NH4+−N) removal rates reached 93% and 98.9%, respectively. Microbial analysis indicated that the symbiosis between Marinobacterium, Marinobacter, and Nitrosomonas might have contributed to simultaneously removing NH4+−N and reducing COD, and the increased enrichment of Nitrosomonas significantly improved the nitrogen removal efficiency. Cleaning ceramic membranes with NaClO solution reduces membrane contamination and membrane cleaning frequency. The combined SBR and C−MBR process is an economical and feasible solution for treating high-salinity oil-bearing wastewater. Based on the pilot application study, the capital expenditure for operating the full-scale combined SBR and C−MBR process was estimated to be 251,717 USD/year, and the unit wastewater treatment cost was 0.21 USD/m3, which saved 62.5% of the energy cost compared to the conventional MBR process.

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Section: Resultsmentioning

confidence: 99%

Pilot Scale Application of a Ceramic Membrane Bioreactor for Treating High-Salinity Oil Production Wastewater

Sun

Jin

2022

Membranes

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“…Microbubbles (MBs) with sizes lower than 50 μm have been used for several cleaning applications, mainly considering their short lifetime which reduces the stagnant time on the surface and the time of process (Tan et al, 2020). Recently, oxygen MBs generated in situ (decomposition of H 2 O 2 ) presented enhancing membrane antifouling in the separation of oil in water emulsion (Wang et al, 2021), removing the foulant through hydrophobic interaction between foulant and MB (adsorbing foulant on MB surface), and subsequent floating up of MBs carrying the foulant. The collapse of MNB infiltrated in the cake and the radicals generated can decompose organic matter and reduce the adhesion of the cake layer.…”

Section: Alternative Membrane Cleaning Methodsmentioning

confidence: 99%

“…Surfactants can absorb and wrap the foulants and wash them away in hydraulic movement (Ding et al, 2020). However, according to Wang et al (2021), excessive chemicals (e.g., NaClO) and surfactants could cause membrane damage or may act as secondary organic foulants.…”

Section: Chemicals Used For Cleaning Membranesmentioning

confidence: 99%

“…Concentrations of this reagent used for cleaning range from 300 to 2000 mg/L (Wang et al, 2014), but high concentrations can negatively affect the membrane properties, for example, it can oxidize the membrane polymers causing fiber swelling, affecting the mechanical stability, and shortening the lifetime of the membrane (Puspitasari et al, 2010; Wang et al, 2018). Parameters such as concentration of NaClO, temperature, and pH are fundamental in the generation of disinfection by‐products (DBPs) like trichloromethane (TCM) and dichloroacetic acid (DCAA) (Wang et al, 2021). Although the NaClO is largely used for cleaning membranes, more research about the effect of NaClO dosage and other process parameters on the physicochemical properties, surface energy, and fouling performance of several types of membrane are necessary.…”

Section: Chemicals Used For Cleaning Membranesmentioning

confidence: 99%

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Alternative methods for cleaning membranes in water and wastewater treatment

Hilares

Singh²,

Meza

et al. 2022

Water Environment Research

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Membrane fouling is caused by foulant deposition or adsorption through physical or chemical interactions on the membrane surface, causing the reduction of flux through the membrane. The main drawbacks of chemical agents used for cleaning are cost, damage caused on the membrane, and waste stream making the process unattractive. Alternative, methods such as ultrasound, enzymatic process, and osmotic backwashing were explored for membrane cleaning. Among all mentioned methods, micronanobubbles have been reported as a promising and emergent method for membrane surface cleaning; unfortunately, the information is limited, but preliminary studies have shown it as an efficient, cheap, and environmentally friendly technique. Other methods like electrically and vibratory‐enhanced membrane cleaning also could be interesting but currently are unexplored and information is limited. Practitioner Points Chemical cleaning is an efficient option; however, from an environmental point of view, it is not attractive, and high concentrations could cause damage to the membrane. Micronanobubbles are an emergent and suitable technology for membrane and surface cleaning. Membrane modification and functionalization avoid membrane fast fouling, and the cleaning process is easier, but the manufacture cost could be expensive.

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“…In most cases, adding QQ strains was used to control biofouling in MBRs, which was first reported in 2009 (Yeon et al, 2009). In addition, the stable operation of bioreactors after adding QQ strains indicated that the control of excessive biomass accumulation or biofouling by this QS inhibition method does not need a performance recovery period compared to other physical or chemical methods (Jiang et al, 2013b;Lee et al, 2018a;Xiao et al, 2018;Liu et al, 2021a;Wang et al, 2021a).…”

Section: Cultivating Qq Bacteriamentioning

confidence: 99%

Quorum sensing regulation methods and their effects on biofilm in biological waste treatment systems: A review

Sun

Yang

et al. 2021

Front. Environ. Sci. Eng.

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Quorum sensing (QS) plays an important role in microbial aggregation control. Recently, the optimization of biological waste treatment systems by QS regulation gained an increasing attention. The effects of QS regulation on treatment performances and biofilm were frequently investigated. To understand the state of art of QS regulation, this review summarizes the methods of QS enhancement and QS inhibition in biological waste treatment systems. Typical QS enhancement methods include adding exogenous QS molecules, adding QS accelerants and cultivating QS bacteria, while typical QS inhibition methods include additions of quorum quenching (QQ) bacteria, QS-degrading enzymes, QS-degrading oxidants, and QS inhibitors. The specific improvements after applying these QS regulation methods in different treatment systems are concluded. In addition, the effects of QS regulation methods on biofilm in biological waste treatment systems are reviewed in terms of biofilm formation, extracellular polymeric substances production, microbial viability, and microbial community. In the end, the knowledge gaps in current researches are analyzed, and the requirements for future study are suggested.

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Formation of disinfection by-products during sodium hypochlorite cleaning of fouled membranes from membrane bioreactors

Cited by 27 publications

References 37 publications

Pilot Scale Application of a Ceramic Membrane Bioreactor for Treating High-Salinity Oil Production Wastewater

Pilot Scale Application of a Ceramic Membrane Bioreactor for Treating High-Salinity Oil Production Wastewater

Alternative methods for cleaning membranes in water and wastewater treatment

Quorum sensing regulation methods and their effects on biofilm in biological waste treatment systems: A review

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