Influence of sodium hypochlorite used for chemical enhanced backwashing on biophysical treatment in MBR

Lee, Eui-Jong; Kwon, Jin-Sub; Park, Hyunsung; Ji, Won Hyun; Kim, Hyungsoo; Jang, Am

doi:10.1016/j.desal.2013.02.003

Cited by 60 publications

(21 citation statements)

References 27 publications

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“…lysed cells was increased from 26% to 98% with increasing the NaClO concentration from 5 to 50 mg g −1 SS . Similarly, it has been reported that a higher‐concentration of NaClO would cause severe cellular lysis of suspended and attached microorganisms Therefore, it is reasonable to consider that NaClO‐triggered microbial lysis during online chemical cleaning of MBR inevitably led to a substantial release of intracellular organic matter, which was the main contributor to the observed generation of DOM in MBRs (Fig. ).…”

Section: Naclo‐triggered Microbial Lysis: An Emerging Source Of Dom Amentioning

confidence: 61%

Potential toxicity and implication of halogenated byproducts generated in MBR online‐cleaning with hypochlorite

Zhang

Liu

2019

J of Chemical Tech & Biotech

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Online chemical cleaning of membrane bioreactor (MBR) with sodium hypochlorite (NaClO) has been extensively applied for membrane fouling mitigation. However, it was recently revealed that residual NaClO from the online cleaning of MBR caused serious microbial lysis with the subsequent formation of dissolved organic matter (DOM), in which a substantial level of halogenated byproducts was detected. Different from those generated in potable water chlorination, most of the halogenated byproducts generated during MBR online cleaning with hypochlorite belonged to the haloaromatic family, which were apparently more toxic than aliphatic compounds. It was shown that a substantial amount of the generated halogenated byproducts passed through the microfiltration membrane and entered the surface waters through the discharge of MBR permeate. As such, the concentration of halogenated byproducts might likely reach an alarming level via bioaccumulation in the aquatic environment. This emerging situation indeed poses serious concerns for the aquatic environment, water supply and public health due to significantly high toxicity of haloaromatic compounds produced. Unfortunately, the potential halogenated byproducts-associated environmental risks have not been carefully and systematically assessed towards the establishment of relevant regulations. Therefore, this review attempted to fill up such a gap by providing the insights into the potential environmental impacts of halogenated byproducts in the MBR permeate.A substantial amount of DOM and halogenated byproducts produced in the online MBR cleaning with NaClO could enter into surface waters (e.g. rivers, lakes, reservoirs, etc.) through the discharge J Chem Technol Biotechnol 2020; 95: 20-26

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Section: Naclo‐triggered Microbial Lysis: An Emerging Source Of Dom Amentioning

confidence: 61%

Potential toxicity and implication of halogenated byproducts generated in MBR online‐cleaning with hypochlorite

Zhang

Liu

2019

J of Chemical Tech & Biotech

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Section: Discussionmentioning

confidence: 99%

“…Membrane cleaning with chemical agents, such as sodium hypochlorite, is the most commonly used method to control biofouling (Lee et al ., 2013 ). However, the application of sodium hypochlorite may adversely affect the structure, and hence function, of polymeric membranes (Puspitasari et al ., 2010 ) and the biological function of activated sludge (Lee et al ., 2013 ). It has been demonstrated that sublethal concentrations of NO can induce biofilm dispersal in a range of bacteria (Barraud et al ., 2006 ; Hetrick et al ., 2009 ; Barnes et al ., 2013 ).…”

Section: Discussionmentioning

confidence: 99%

“…A number of strategies have been tested to reduce biofouling in MBRs, such as modification of membrane surface properties (Tan and Obendorf, 2007 ), ultrasonic vibrations (Veerasamy et al ., 2009 ) and chemical cleaning with acid or alkaline (Madaeni et al ., 2009 ). Chemical cleaning is the most popular method in biofouling control, which can kill microbes and remove biofouling materials from the membranes (Lee et al ., 2013 ). However, overuse of chemicals may damage the polymeric membrane structure (Puspitasari et al ., 2010 ) and also pose an environmental and health risk (Estrela et al ., 2002 ).…”

Section: Introductionmentioning

confidence: 99%

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The application of nitric oxide to control biofouling of membrane bioreactors

Luo

Zhang

Barnes

et al. 2015

Microbial Biotechnology

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A novel strategy to control membrane bioreactor (MBR) biofouling using the nitric oxide (NO) donor compound PROLI NONOate was examined. When the biofilm was pre-established on membranes at transmembrane pressure (TMP) of 88–90 kPa, backwashing of the membrane module with 80 μM PROLI NONOate for 45 min once daily for 37 days reduced the fouling resistance (Rf) by 56%. Similarly, a daily, 1 h exposure of the membrane to 80 μM PROLI NONOate from the commencement of MBR operation for 85 days resulted in reduction of the TMP and Rf by 32.3% and 28.2%. The microbial community in the control MBR was observed to change from days 71 to 85, which correlates with the rapid TMP increase. Interestingly, NO-treated biofilms at 85 days had a higher similarity with the control biofilms at 71 days relative to the control biofilms at 85 days, indicating that the NO treatment delayed the development of biofilm bacterial community. Despite this difference, sequence analysis indicated that NO treatment did not result in a significant shift in the dominant fouling species. Confocal microscopy revealed that the biomass of biopolymers and microorganisms in biofilms were all reduced on the PROLI NONOate-treated membranes, where there were reductions of 37.7% for proteins and 66.7% for microbial cells, which correlates with the reduction in TMP. These results suggest that NO treatment could be a promising strategy to control biofouling in MBRs.

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“…This is due to the alteration in membrane properties caused by the chemical's effect. The right dosage of the sodium hypochlorite chemical is very important, because it will affect the micro-organism safety of the biological process [60]. The research reported that a chemical dosage of 1 mg-NaOCl/ MLVSS was safe for the process.…”

Section: Fouling Control Using a Backwash Operationmentioning

confidence: 99%

Fouling control strategy for submerged membrane bioreactor filtration processes using aeration airflow, backwash, and relaxation: a review

Yusuf

Wahab

Sahlan

2015

Desalination and Water Treatment

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A B S T R A C TAs of today, the application of membrane bioreactors (MBRs) in wastewater treatment plants has become significantly important in various industries. The success of MBR is mainly because of the effective membrane technology used in this kind of reactor. However, membrane technology does not escape from several drawbacks, which includes high maintenance costs and fouling problems. In order to run a plant with both an optimum capability and cost, an in-depth understanding of the behavior of filtration systems is very important to the plant operator. In this paper, we review and have considered the fouling control techniques applied to submerged membrane filtration processes including hollow fiber membranes and flat sheet types of membrane filtration. The review covers the techniques involving operational parameters, such as aeration, backwashing, and relaxation. In addition, in this paper, the modeling techniques and available automatic control techniques, using stated parameters to control fouling in membrane filtration processes, are presented. The performance results of each technique are then discussed and reviewed.

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Influence of sodium hypochlorite used for chemical enhanced backwashing on biophysical treatment in MBR

Cited by 60 publications

References 27 publications

Potential toxicity and implication of halogenated byproducts generated in MBR online‐cleaning with hypochlorite

Potential toxicity and implication of halogenated byproducts generated in MBR online‐cleaning with hypochlorite

The application of nitric oxide to control biofouling of membrane bioreactors

Fouling control strategy for submerged membrane bioreactor filtration processes using aeration airflow, backwash, and relaxation: a review

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