Low powdered activated carbon concentrations to improve MBR sludge filterability at high salinity and low temperature

Remy, Maxime; Temmink, Hardy; Brink, Paula van den; Rulkens, W.H.

doi:10.1016/j.desal.2011.03.080

Cited by 18 publications

(3 citation statements)

References 29 publications

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“…The positive effect of PAC in MBR systems has been confirmed by other studies. They indicated that adding a low dosage of PAC could improve the critical flux of MBRs, reduce membrane fouling in MBRs and improve MBR sludge filterability at high salinity and low temperature (Remy et al, 2010;Remy et al, 2011;Remy et al, 2009). According to the above review, these modified processes have dominant advantages in removing antibiotics and hormones from wastewater, like high performance and high ability of biodegradation.…”

Section: Modified Processesmentioning

confidence: 99%

Bioprocessing for elimination antibiotics and hormones from swine wastewater

Cheng

Ngo

Guo

et al. 2018

Science of The Total Environment

253

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Antibiotics and hormones in swine wastewater have become a critical concern worldwide due to the severe threats to human health and the eco-environment. Removal of most detectable antibiotics and hormones, such as sulfonamides (SAs), SMs, tetracyclines (TCs), macrolides, and estrogenic hormones from swine wastewater utilizing various biological processes were summarized and compared. In biological processes, biosorption and biodegradation are the two major removal mechanisms for antibiotics and hormones. The residuals in treated effluents and sludge of conventional activated sludge and anaerobic digestion processes can still pose risks to the surrounding environment, and the anaerobic processes' removal efficiencies were inferior to those of aerobic processes. In contrast, membrane bioreactors (MBRs), constructed wetlands (CWs) and modified processes performed better because of their higher biodegradation of toxicants. Process modification on activated sludge, anaerobic digestion and conventional MBRs could also enhance the performance (e.g. removing up to 98% SMs, 88.9% TCs, and 99.6% hormones from wastewater). The hybrid process combining MBRs with biological or physical technology also led to better removal efficiency. As such, modified conventional biological processes, advanced biological technologies and MBR hybrid systems are considered as a promising technology for removing toxicants from swine wastewater.

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Section: Modified Processesmentioning

confidence: 99%

Bioprocessing for elimination antibiotics and hormones from swine wastewater

Cheng

Ngo

Guo

et al. 2018

Science of The Total Environment

253

View full text Add to dashboard Cite

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“…thereby preventing the accumulation of particulate matter on the membranes (Lesage et al, 2008). A low PAC dosage (0.5 g L -1 ), combined with a long SRT, namely 50 d, reduced fouling significantly in a pilot MBR (Remy et al, 2011). This effect has been ascribed to the deposition of a dynamic and permeable PAC layer on the surface of the membranes, protecting them from deposition by foulants (Pirbazari et al, 1996;Ying and Ping, 2006).…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Fouling control in membrane bioreactors with sewage-sludge based adsorbents

et al. 2016

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The potential application of powdered activated carbon (PAC) to mitigate membrane fouling has been tested in membrane bioreactors (MBRs) fed with cosmetic wastewater. Inexpensive powder activated carbon was prepared from sewage sludge biosolids (B-PAC) by pyrolysis (750 °C; 0.5 h) and air-activation (400 °C; 2 h). Adsorption capacities of 143 and 570 mg g were reached for carbohydrates and proteins, respectively, quite similar to those of a commercial activated carbon (C-PAC). To check the effect of PAC addition on membrane fouling, three MBRs were simultaneously operated without (control-MBR) and with PAC (B-MBR and C-MBR) for 150 days in continuous mode at 8 L m h flux. Similar COD removal efficiencies were achieved in these three MBR systems. After 100 days of operation, the effect of the PACs on the sludge filterability was studied in the MBRs for 10 days. B-MBR showed stable transmembrane pressure (TMP) after 9 days of operation, unlike of control-MBR and C-MBR, where the TMP increased after the 2nd and 5th days, respectively. Therefore, operational cost saving can be achieved in the membrane cleaning due to decrease of fouling rate. Operating at stable state condition the addition of PAC gave rise to an increase of the critical flux of 25%. In an extra shear test, carried out at the end of the continuous experiment, a clear reduction in mean size of the flocs from 45 to 28 μm was observed in control-MBR. However, the extra shear led to a slight reduction of the mean size of flocs (less than 5%) in MBRs with PAC, with average sizes of 62 and 71 μm in C-MBR and B-MBR, respectively. The molecular weight fractionation of the MBR demonstrated a higher selectivity of B-PAC toward the adsorption of proteins smaller than 1 μm which prevents the irreversible fouling of the membranes. The membranes lifetime was increased because the B-PAC extended the filtration for a longer period than C-PAC, probably due to its easier in-situ regeneration.

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“…monovalent cations replacing bivalent cations, causing the microbial flocs to disrupt [8]. It also has been reported in literature, that high concentrations of salts can affect membrane performance [19,20], increase fouling propensity [20,21], disturb biotreatment processes [15,22] and consequently reduce water quality [19,20,23,24]. However, the impact of the typical winter phenomenon 'road salt' on activated sludge characteristics and on the filterability in particular, has been largely overlooked in the past.…”

Section: Influent Composition Effectmentioning

confidence: 99%