A new combined inorganic–organic flocculant (CIOF) as a performance enhancer for aerated submerged membrane bioreactor

Nguyen, Tien Thanh; Guo, Wenshan; Ngo, Huu Hao; Vigneswaran, S.

doi:10.1016/j.seppur.2010.07.010

Cited by 22 publications

(7 citation statements)

References 24 publications

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“…More details on aeration are given in Section 6.2. In connection with (v), the nature of the biomass in MBRs can be partially controlled through the addition of coagulants or flocculants [124,[140][141][142][143][144] and adsorbent agents (e.g., activated carbon [145][146][147][148][149][150][151]). In addition, the bioprocess parameters, such as the sludge retention time (SRT), influence the biomass and supernatant as well as the fouling [152].…”

Section: Blocking and Blocking Mitigation In Submerged Hf Modulesmentioning

confidence: 99%

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%

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

et al. 2017

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“…In terms of nutrient removal, the MBR-G showed higher PO 4 -P removal (90.12 ± 8.76%) than those of the CMBR (68.75 ± 6.98%) over the entire period of operation, suggesting that PO 4 -P removal could be enhanced by enrichment of the activated sludge system with phosphorus accumulating organisms (PAOs) and biomass metabolism due to Gemfloc Ò addition [13,15]. Similar NH 4 -N removal was found for the MBR-G (87.41 ± 7.52%) and the CMBR (86.41 ± 9.63%), indicating that both MBRs exhibited high degree of biological nitrification as nitrifying bacteria was retained during membrane filtration process at infinite sludge retention time [26].…”

Section: The Performance Of the Mbr-g And The Cmbrmentioning

confidence: 98%

“…Moreover, the MBR-G achieved higher T-N removal of 75.56 ± 6.72%, while only 32.45 ± 8.35% of T-N was reduced in the CMBR during the operation period. It was attributed to the fact that larger flocs obtained in the MBR-G (see Section 3.3) promoted the denitrification process inside the biomass due to oxygen gradient existing within the flocs [13]. TMP profile depicting fouling propensity for two MBRs is shown in Fig.…”

Section: The Performance Of the Mbr-g And The Cmbrmentioning

confidence: 99%

“…Additionally, combined flocculants have also been exploited recently. A new combined inorganic-organic flocculant (CIOF) of FeCl 3 and MPE50 prepared by Nguyen et al [13] was added to an aerated submerged MBR. The results indicated that the CIOF was successful in alleviating membrane fouling while maintaining stable SVI and low transmembrane pressure (TMP) development rate.…”

Section: Introductionmentioning

confidence: 99%

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Membrane fouling reduction and improvement of sludge characteristics by bioflocculant addition in submerged membrane bioreactor

Deng

Guo

Ngo

et al. 2015

Separation and Purification Technology

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a b s t r a c tThe effectiveness of a green bioflocculant (Gemfloc Ò ) on enhanced performance of a submerged membrane bioreactor (SMBR) was evaluated in terms of membrane fouling reduction and sludge characterization. Two MBRs were operated parallelly in this study, namely conventional MBR (CMBR) and MBR with Gemfloc Ò addition (MBR-G). Results showed mitigated membrane fouling through Gemfloc Ò addition in terms of cake layer formation and pore blocking. When compared to the CMBR, in spite of more extracellular polymeric substances (EPS) presented in activated sludge, the MBR-G demonstrated less soluble microbial products (SMP), larger sludge flocs, higher zeta potential and greater relative hydrophobicity of sludge flocs, which decreased cake layer resistance and pore blocking resistance. The reduced cake layer resistance in the MBR-G could be also ascribed to less growth of suspended biomass, lower sludge viscosity, as well as less EPS, SMP and biopolymer clusters in the cake layer. In addition, a modified resistance-in-series model was employed by considering SMP and mixed liquor suspended solids. The simulated results implied that the model could predict the influence of sludge characteristics on membrane fouling behavior of the SMBR.

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“…Except for water treatment, the inorganic-organic flocculant also can use as the performance enhancer for aerated submerged membrane bioreactor. 18 Though the inorganicorganic composite flocculants are paid more attentions recently, there did not have few flocculation mechanisms of the composite flocculants in these studies.…”

Section: Introductionmentioning

confidence: 98%

A new cation‐modified Al‐polyacrylamide flocculant for solid–liquid separation in waste drilling fluid

Zhang

Miao

Zou

2014

J of Applied Polymer Sci

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A new cation-modified Al-polyacrylamide (CAPAM) flocculant was prepared by the in situ polymerization of acrylamide (AM) and (2-methacryloyloxyethyl) trimethyl ammonium chloride (DMC) with Al(OH) 3 sol. The optimum preparation conditions were obtained by a one-factor experimental design: as the amount of AlCl 3 was fixed at 0.025 mol, the polymerization time, polymerization temperature, n(AM) : n(AlCl 3 ), n(DMC) : n(AlCl 3 ), and n(K 2 S 2 O 8 ) : n(AM) were 4 h, 70 C, 8, 0.9, and 1.82 3 10 23 , respectively. The CAPAM was characterized by thermogravimetric analysis, Fourier transform infrared spectroscopy, scanning electron microscopy, and transmission electron microscopy. The solid-liquid separation performance of the CAPAM was evaluated in terms of water content. The CAPAM showed better flocculation performance than cationic polyacrylamide and polyaluminum sulfate at a fixed concentration of 0.3% in waste drilling fluid and tended to perform well in alkaline solution.

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A new combined inorganic–organic flocculant (CIOF) as a performance enhancer for aerated submerged membrane bioreactor

Cited by 22 publications

References 24 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

Membrane fouling reduction and improvement of sludge characteristics by bioflocculant addition in submerged membrane bioreactor

A new cation‐modified Al‐polyacrylamide flocculant for solid–liquid separation in waste drilling fluid

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