Membrane cleaning in membrane bioreactors: A review

Wang, Zhiwei; Ma, Jinxing; Tang, Chuyang Y.; Kimura, Katsuki; Wang, Qiaoying; Han, Xiaomeng

doi:10.1016/j.memsci.2014.05.060

Cited by 717 publications

(345 citation statements)

References 313 publications

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“…With respect to (ii), physical cleaning tends to remove reversible fouling while chemical cleaning can remove some irreversible fouling. The primary physical cleaning parameters include duration, frequency, and backwash flux [88,107,109,131,132], while the type and concentration of reagents are the important parameters for effective chemical cleaning [124,131,[133][134][135][136]. Regarding (iii), flux reduction is not as cost-effective as might be expected, but the attendant extension of membrane lifespan and smoother operation may counterbalance some of the increased cost.…”

Section: Blocking and Blocking Mitigation In Submerged Hf Modulesmentioning

confidence: 99%

“…The application of relaxation (intermittent cessation of permeation), backwashing (reversal of permeate flow through the pores), and air backwashing with or without air scouring are common physical approaches to remove fouling in submerged systems. It has been shown in many studies that relaxation and backwashing provide an effective removal of the fouling layer, thereby prolonging the filtration process in submerged membrane systems, especially at high imposed fluxes [88,90,131,286,287]. A significant challenge in the application of relaxation and backwashing is that only partial recovery of the permeability is achieved at the end of a filtration cycle, which implies a gradual loss of the effective filtration area due to fouling.…”

Section: Techniques For Fouling Control In Dead-end Submerged Membranmentioning

confidence: 99%

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The Performance and Fouling Control of Submerged Hollow Fiber (HF) Systems: A Review

et al. 2017

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Abstract:The submerged membrane filtration concept is well-established for low-pressure microfiltration (MF) and ultrafiltration (UF) applications in the water industry, and has become a mainstream technology for surface-water treatment, pretreatment prior to reverse osmosis (RO), and membrane bioreactors (MBRs). Compared to submerged flat sheet (FS) membranes, submerged hollow fiber (HF) membranes are more common due to their advantages of higher packing density, the ability to induce movement by mechanisms such as bubbling, and the feasibility of backwashing. In view of the importance of submerged HF processes, this review aims to provide a comprehensive landscape of the current state-of-the-art systems, to serve as a guide for further improvements in submerged HF membranes and their applications. The topics covered include recent developments in submerged hollow fiber membrane systems, the challenges and developments in fouling-control methods, and treatment protocols for membrane permeability recovery. The highlighted research opportunities include optimizing the various means to manipulate the hydrodynamics for fouling mitigation, developing online monitoring devices, and extending the submerged HF concept beyond filtration.

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Section: Blocking and Blocking Mitigation In Submerged Hf Modulesmentioning

confidence: 99%

Section: Techniques For Fouling Control In Dead-end Submerged Membranmentioning

confidence: 99%

The Performance and Fouling Control of Submerged Hollow Fiber (HF) Systems: A Review

et al. 2017

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“…Biofouling is specifically related to the deposition and metabolic activity of bacterial cells on the membrane and includes the accumulation and adsorption of extracellular polymeric substances (EPS) and soluble microbial products (SMP); while organic and inorganic fouling refer to macromolecular species (proteins, polysaccharides, humic acids and other organic substances) and scale formation, respectively (Wang et al, 2014).…”

Section: Resultsmentioning

confidence: 99%

Fouling layer characterization and pore-blocking mechanisms in an UF membrane externally coupled to a UASB reactor

Peláez¹,

Morgan-Sagastume²,

Noyola³

2017

WSA

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A pilot-scale UASB reactor coupled with an external ultrafiltration (UF) membrane was operated under three different hydraulic retention times (HRT: 4, 8 and 12 h) for municipal wastewater treatment in order to assess the composition and distribution of the fouling layer, as well as to identify the predominant fouling mechanisms. For that purpose, membrane autopsies were carried out based on fouling layer density determination, thermogravimetric, SEM and EDX analysis. Results showed a variable density of the fouling layer (average values were 13.90 ± 0.22, 13.46 ± 1.15 and 12.78 ± 0.49 mg/cm 2 for HRT of 4, 8 and 12 h, respectively), indicating that this parameter had an impact on the fouling density. Organic material was predominant in the fouling layer, being around 75% of its composition for the three HRT studied. Regarding pore-blocking mechanisms, standard blocking was the predominant mechanism at the beginning of filtration, coexisting at the end of it with cake filtration. In the first filtration cycle (1 h), after standard blocking, intermediate and complete blocking developed simultaneously during a short period of time and, finally, cake filtration prevailed. However, in the last (19 th ) filtration cycle, standard blocking and cake filtration occurred simultaneously from the beginning, suggesting the existence of an irreversible fouling layer, in spite of chemical cleaning.

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“…Membranın fiziksel ve/veya kimyasal yöntemlerle temizlenmesi, tıkanıklıkların azaltılması ve uzun dönemli işletimlerde optimum membran performansının sağlanması açısından gereklidir. Bu temizleme aşamasının sıklığı hava kabarcıklarının dağılımı yöntemiyle veya kritik akıdan daha düşük süzüntü akısının sağlanmasıyla önemli ölçüde azaltılabilir (Wang et al, 2014). Kritik akı, zar-basınç ve akı arasındaki doğrudan ilişkinin bir göstergesidir.…”

Section: Ksu Journal Of Engineering Sciences 20(2) 2017unclassified

Anaerobik Membran Biyoreaktörde TMP-Akı Değerlendirmesi

Göçer¹,

Akman²,

Cırık³

2017

Kahramanmaraş Sütçü İmam Üniversitesi Mühendislik Bilimleri Dergisi

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ÖZET Membran biyoreaktör teknolojisi, yüksek arıtma performansı GİRİŞKentsel atıkların yönetiminde nihai bertaraf yöntemi olan katı atık depolama sahalarının en önemli sorunlarından biri sızıntı suyu yönetimidir. Sızıntı suyu arıtımı evsel atıksulara göre oldukça zor ve karmaşık bir proses gerektirir. Sızıntı suyu hacimsel olarak az ancak organik kirlilik yükü açısından çok yüksek bir atıksu türüdür. Bu nedenle, miktarca az olmasına rağmen çevresel etkilerinin oldukça önemli ve riskli olması nedeniyle, sızıntı suyunun oluşumunun kontrol altına alınarak asgari seviyelere çekilmesi ve uygun arıtma yöntemlerle arıtılması gerekmektedir. Sızıntı suları, katı atıkların ana bileşenlerinden kaynaklanan birçok element ve bileşiği ihtiva etmektedir. Sızıntı suyu karakteristiği değişken bir yapıya sahiptir. Sızıntı suyunun karakteristiği; katı atık bileşenleri, depo yaşı, depo alanının hidrojeolojik durumu, depo içindeki fiziksel, kimyasal ve biyolojik aktiviteler, atıktaki su muhtevası, ısı, pH, redoks potansiyeli, stabilizasyon derecesi, atık yüksekliği, işletme şartları ve iklim şartlarına göre değişiklik gösterir (Akkaya ve Demir, 2009). Sızıntı suyu çok karmaşık ve yüksek kirlilik potansiyeline sahiptir. Katı atıkların kompozisyonu zamana ve bölge şartlarına bağlı olarak değişebildiğinden bu atıklardan oluşan sızıntı suyunun karakteristiği de büyük ölçüde değişebilmektedir ve kompleks içeriği nedeniyle arıtımı en zor suların başında sızıntı suları gelmektedir. Bu nedenle tek bir arıtım yöntemi ile nihai bir arıtım sağlamak sızıntı suları için pek mümkün değildir.

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Membrane cleaning in membrane bioreactors: A review

Cited by 717 publications

References 313 publications

The Performance and Fouling Control of Submerged Hollow Fiber (HF) Systems: A Review

The Performance and Fouling Control of Submerged Hollow Fiber (HF) Systems: A Review

Fouling layer characterization and pore-blocking mechanisms in an UF membrane externally coupled to a UASB reactor

Anaerobik Membran Biyoreaktörde TMP-Akı Değerlendirmesi

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