Wastewater treatment using membrane filtration—effect of biosolids concentration on cake resistance

Chang, In-Soung; Kim, Su-Na

doi:10.1016/j.procbio.2004.06.019

Cited by 171 publications

(77 citation statements)

References 16 publications

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“…The lower range is insufficiently captured by the data, however for higher ranges there is a clear improvement of filterability with increasing MLSS concentrations. Nevertheless, Chang and Kim (2005) measured an increased cake resistance with an MLSS concentration shift from 0.09 to 3.7 g/L, Fang and Shi (2005) an increase in total resistance with a shift from 2.4 to 9.6 g/L and Psoch and Schiewer (2006) an increased fouling potential with a shift from 3 to 10 g/L in MLSS concentration. Therefore, it seems logical to assume that good sludge filterability might also be possible in sludge with low MLSS concentrations.…”

Section: Introductionmentioning

confidence: 92%

Impact of suspended solids concentration on sludge filterability in full-scale membrane bioreactors

Lousada-Ferreira

Lier

Graaf³

2015

Journal of Membrane Science

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The relation between activated sludge filterability and mixed liquor suspended solids (MLSS) concentration in membrane bioreactors (MBRs) is framed in a single hypothesis, explaining results seemingly contradictory. A total of 44 activated sludge samples were collected and analyzed on a variety of parameters, i.e. filterability, MLSS concentration, soluble microbial products (SMP) concentrations and particle size distribution in the range of 2-100 μm and of 0.4-5.0 μm. The sludge filterability was assessed by using the Delft Filtration Characterization method (DFCm). In order to investigate the impact of MLSS concentration, identical samples were diluted with permeate. Results showed that dilution of the samples led to an increased activated sludge filterability, but only when the starting MLSS concentration was below the apparent critical value of 10.5 g/L. As opposed, the filterability of sludge with MLSS concentrations above 10.5 g/L, and which was characterized by a moderate to good filtration quality, i.e. R 20 <1 [x10 12 m -1 ], worsened when diluted. The specific resistance times the particle concentration of a cake layer obtained when filtrating sludge of moderate to good filterability and MLSS concentration above the apparent critical value, was 5.5 times smaller compared to the cake layer of sludge with MLSS concentration below the critical value. Results from SMP assessment and particle counting in the range 2-100 µm showed that reduction in sludge mass and de-flocculation occurred, upon dilution of all samples. However, when diluting sludge samples with MLSS concentrations exceeding 10.5 g/L and which were characterized by a moderate to good filtration characteristics, there was also release of particles below 0.4 µm, opposite to dilutions of samples with MLSS concentrations below 10.5 g/L. We postulate that sludge, which is characterized by a moderate to good filterability, having an MLSS concentration above the apparent critical value of 10.5 g/L, is likely to retain particles smaller than 0.4 μm in its mass, as opposed to sludge with MLSS concentration below the apparent critical value. Our work indicates that there are optimal MLSS concentration ranges in MBR technology, to promote good filterable sludge quality in order to avoid fouling.

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Section: Introductionmentioning

confidence: 92%

Impact of suspended solids concentration on sludge filterability in full-scale membrane bioreactors

Lousada-Ferreira

Lier

Graaf³

2015

Journal of Membrane Science

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“…In the submerged hollow fiber MBR, the membranes are directly immersed in the aeration tank. The results of bench-scale experiments, as well as many industrial and municipal operations, demonstrate high treatment efficiencies for chemical oxygen demand (COD), total suspended solids (TSS), and turbidity [19,42,63,67,68]. Although the MBR technology has been applied in many full-scale plants worldwide for treating municipal and industrial wastewater, membrane fouling and correspondingly increased energy consumption remain chief obstacles, as highlighted in a recent review [28].…”

Section: Membrane Bioreactors (Mbrs)mentioning

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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“…Due to an increase in MLSS concentration, at lower HRTs, membrane fouled more quickly as compared to that in higher HRTs because membrane exposed with more concentrated culture and higher non-Newtonian viscosity at lower HRT, which caused the membrane fouling faster (Table 5). Chang and Kim (2005) observed that the increase in MLSS concentration seems to have a mostly negative impact (higher TMP or lower flux) on the MBR hydraulic performance.…”

Section: Effect Of Hrt On Biomass Concentration and Tmpmentioning

confidence: 92%

Treatment of wastewater from biodiesel plants using microbiological reactor technology

Khan

Yamsaengsung

Chetpattananondh

et al. 2014

Int. J. Environ. Sci. Technol.

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The objective of this paper was to introduce the aerobic microbiological reactor technology for wastewater treatment of biodiesel plants and find out the key factors that are involved in membrane fouling. The research was carried out in two steps. In the first step, sulfuric acid of pH 2, 2.5 and 3 was added to biodiesel wastewater and significant reduction in organic pollutants was observed at pH 2.5 such as chemical oxygen demand, and oil and grease were found to be 74-84 and 84.2-92.6 %, respectively. In the second step, microbiological reactor was operated at different hydraulic retention times of 15, 12, 9 and 6 h along with an increase in organic loading rates (range 1-3 g/L day) on individual hydraulic retention times. However, overall chemical oxygen demand and oil and grease removal efficiency remained in the range of 91.7-97.20 and 95.5-97.9 %, respectively, throughout the experiment, while severe membrane fouling was observed with decreasing hydraulic retention time due to decrease in dissolved oxygen concentration and increase in mixed liquid suspended solids, and soluble microbial product containing protein and polysaccharide. At lower hydraulic retention time of 6 h, an increase in particle size was reported as 27.9-62.7 lm, and soluble microbial product containing protein and polysaccharide reported as 20-60 and 19-59 mg/L, respectively. Higher soluble microbial product level led to increase in particle size with irregular shape, which led to severe membrane fouling.

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Wastewater treatment using membrane filtration—effect of biosolids concentration on cake resistance

Cited by 171 publications

References 16 publications

Impact of suspended solids concentration on sludge filterability in full-scale membrane bioreactors

Impact of suspended solids concentration on sludge filterability in full-scale membrane bioreactors

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

Treatment of wastewater from biodiesel plants using microbiological reactor technology

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