Effect of sludge pretreatment on the performance of anaerobic/ anoxic/ oxic membrane bioreactor treating domestic wastewater

Banu, J. Rajesh; Uan, Do Khac; Kaliappan, S.; Yeom, Ikjun

doi:10.1007/bf03326216

Cited by 29 publications

(9 citation statements)

References 31 publications

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“…From the above, it was evident that the reduction of solids was comparatively higher in deflocculated sludge than in the flocculated sludge. This was in line with the results documented by other researchers (Banu et al, 2011). The main reason for SS removal is accredited to microwave solubilisation of particulate organics into soluble organics (Uma et al, 2013), and it can be correlated with the COD solubilisation.…”

Section: Sludge Solubilisation By Mw Treatmentsupporting

confidence: 91%

Influence of deflocculation on microwave disintegration and anaerobic biodegradability of waste activated sludge

Ebenezer

Kaliappan²,

Kumar

et al. 2015

Bioresource Technology

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Section: Sludge Solubilisation By Mw Treatmentsupporting

confidence: 91%

Influence of deflocculation on microwave disintegration and anaerobic biodegradability of waste activated sludge

Ebenezer

Kaliappan²,

Kumar

et al. 2015

Bioresource Technology

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“…The estimated sludge yields were generally lower than those measured for typical activated sludge systems, (0.4 g MLSS/g COD, as observed by Tchobanoglous et al [36]) and were comparable to those measured for sequencing batch aerobic systems (0.26-0.7 g SS/g COD, as observed by Keskes et al [37]) and to those of other biofilm systems -membrane bioreactors (0.12 g MLSS/g COD, as observed by Banu et al [38]). …”

Section: Sludge Volume Indexsupporting

confidence: 88%

An evaluation of the performance and optimization of a new wastewater treatment technology: the air suction flow-biofilm reactor

Forde

Kennelly

Gerrity

et al. 2014

Environmental Technology

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In this laboratory study, a novel wastewater treatment technology, the air suction flow-biofilm reactor (ASF-BR) - a sequencing batch biofilm reactor technology with a passive aeration mechanism - was investigated for its efficiency in removing organic carbon, nitrogen and phosphorus, from high-strength synthetic wastewaters. A laboratory-scale ASF-BR comprising 2 reactors, 350 mm in diameter and 450 mm in height, was investigated over 2 studies (Studies 1 and 2) for a total of 430 days. Study 1 lasted a total of 166 days and involved a 9-step sequence alternating between aeration, anoxic treatment and settlement. The cycle time was 12.1 h and the reactors were operated at a substrate loading rate of 3.60 g filtered chemical oxygen demand (CODf)/m2 media/d, 0.28 g filtered total nitrogen (TNf)/m2 media/d, 0.24 g ammonium-nitrogen (NH4-N)/m2 media/d and 0.07 g ortho-phosphate (PO4-P)/m2 media/d. The average removal rates achieved during Study 1 were 98% CODf, 88% TNf, 97% NH4-N and 35% PO4-P. During Study 2 (264 days), the unit was operated at a loading rate of 2.49 g CODf/m2 media/d, 0.24 g TNf/m2 media/d, 0.20 g NH4-N/m2 media/d and 0.06 PO4-P/m2 media/d. The energy requirement during this study was reduced by modifying the treatment cycle in include fewer pumping cycles. Removal rates in Study 2 averaged 97% CODf, 86% TNf, 99% NH4-N and 76% PO4-P. The excess sludge production of the system was evaluated and detailed analyses of the treatment cycles were carried out. Biomass yields were estimated at 0.09 g SS/g CODf, removed and 0.21 g SS/g CODf, removed for Studies 1 and 2, respectively. Gene analysis showed that the use of a partial vacuum did not affect the growth of ammonia-oxidizing bacteria. The results indicate that the ASF-BR and passive aeration technologies can offer efficient alternatives to existing technologies.

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“…The combination of ozone with alkali has several advantages, such as decrease in the cost of treatment by reducing the ozone dosage, no pH correction required after pretreatment, and saving of released organic carbon [20]. The components for the alkaline-ozone pretreatment were selected based on findings from earlier studies [21,22]. In the present study, a new advanced wastewater treatment process is developed by integrating the MBR process with combined alkaline-ozone sludge pretreatment process for high-strength domestic wastewater.…”

Section: Desalination and Water Treatmentmentioning

confidence: 99%

Effect of alkaline and ozone pretreatment on sludge reduction potential of a membrane bioreactor treating high-strength domestic wastewater

Kumar

Arulazhagan

et al. 2015

Desalination and Water Treatment

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A B S T R A C TThe wide application and utilization of the activated sludge process has resulted in the production of excess sludge, posing a serious disposal problem. Many efforts have been dedicated to reduce the excess sludge by treatments such as digestion and dewatering. In this study, an aerobic submerged membrane bioreactor (MBR) was used to study the effect of alkaline and ozone pretreatment on the efficiency of sludge reduction. For this purpose, two MBRs were fabricated. Among the two MBRs, one acted as a control reactor (CMBR) and the other acted as an experimental reactor (EMBR). The MBRs were operated with mixed liquor suspended solids (MLSS) concentrations in the range of 7,000-7,200 mg/L for a period of 120 d. In the EMBR, part of the MLSS was withdrawn at a ratio of 1.5% of Q and was pretreated by alkali-ozone. The sludge pretreatment was carried out at pH 11 and an ozone dosage of 0.09 gO 3 /g MLSS. During the pretreatment, 40% COD solubilization and 30% suspended solid reduction were observed. The pretreated sludge was returned to the reactor for further degradation, where it was found to be 37% degraded. During the 120 d of reactor operation, both of the MBRs maintained a relatively constant transmembrane pressure. The sludge digestion does not have any impact on the COD removal efficiency of the reactor.

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Effect of sludge pretreatment on the performance of anaerobic/ anoxic/ oxic membrane bioreactor treating domestic wastewater

Cited by 29 publications

References 31 publications

Influence of deflocculation on microwave disintegration and anaerobic biodegradability of waste activated sludge

Influence of deflocculation on microwave disintegration and anaerobic biodegradability of waste activated sludge

An evaluation of the performance and optimization of a new wastewater treatment technology: the air suction flow-biofilm reactor

Effect of alkaline and ozone pretreatment on sludge reduction potential of a membrane bioreactor treating high-strength domestic wastewater

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