Pilot-scale testing membrane bioreactor for wastewater reclamation in industrial laundry

Abstract

A pilot-scale study of membrane bioreactor treatment for reclamation of wastewater from Berendsen Textile Service industrial laundry in Søborg, Denmark was carried out over a 4 month period. A satisfactory COD degradation was performed resulting in a low COD in the permeate (< 50 mg/l). To obtain satisfactory treatment, addition of nitrogen was necessary. The biodegradability of the permeate was very low (BOD5 < 2 mg/l). A hydraulic retention time of 1 d turned out to be sufficient at a sludge concentration of 10 g MLSS/l. Through addition of a cationic polymer, a satisfactory dewaterability of the sludge was reached. Membrane tests showed that operating at a trans-membrane pressure of 3 bar and a cross-flow velocity of 4 m/s, a flux of 120 l/m2h can be expected without using chemicals for membrane cleaning. The quality of the permeate was very good when comparing to the reuse quality demands of water to the wash processes. Reuse of the permeate in all rinsing steps requires additional treatment through reverse osmosis.

Advanced treatment of textile wastewater towards reuse using a membrane bioreactor

“…Comparable results were found by Ref. [10], who obtained sludge yields between 0.14 and 0.16 g TSS/g COD degraded for an MBR fed with laundry wastewater. In contrast to these observations [7] report an unexpectedly high sludge yield of 0.29 at a F/M ratio of 0.1 g COD/gTSS.…”

Greywater recycling: treatment options and applications

“…Similarly, after the same duration of air interruption, the recovery times were 4, 4, 24, 28 and 24 h respectively. The longest recovery times were observed after interruption of both air and feed simultaneously (40,40,4,24,48 h respectively). None of the parameters recovered to preinterruption levels within 48 h of a 25-day feed interruption.…”

“…During the same period, simple physical separators coupled with disinfection processes were being developed and installed in individual houses. 19,22,23 In the late 1990s, reports also emerged on the use of advanced technologies such as membrane bio-reactors (MBRs) [24][25][26][27] and cheaper extensive technologies such as reed beds [28][29][30][31] and ponds. 32,33 Interestingly, only three chemical treatments-electro-coagulation, 34 Schemes for greywater recycling are found in most parts of the world.…”

“…Additionally, MBRs achieved excellent removal of the organic and solid fractions, with average residuals of 3 mg/l for BOD, 3 NTU for turbidity and 6 mg/l for SS. 2,24,25,27,61 Jefferson et al 55 reported that, at small scale, variations in the strength and flow of greywater and potential shock loading affect the performance of biological-based technologies. Laine 2 investigated the effect of domestic product spiking on biomass from an MBR and reported that products such as bleach, caustic soda, perfume, vegetable oil and washing powder were relatively toxic with median effective concentration (EC 50 ) values of 2 .…”

Feasibility of a semi-batch vertical-flow wetland for onsite residential graywater treatment

“…); 30 mg/L (max. PO 4 -P, mg/L 15 AE 23 0.5 TP, mg/L 11* -E. coli, CFU/100 mL -4 Â 10 6 * Fecal, CFU/100 mL 4 Â 10 4 * 8 Â 10 5 AE 2 Â 10 5 Total coliform, CFU/100 mL 4 Â 10 7 AE 5 Â 10 7 1 Â10 4 AE 1 Â10 5 References (Surendran and Wheatley, 1998;Andersen et al, 2002;SostarTurk et al, 2005;Friedler, 2004;Friedler et al, 2006;Gilboa and Friedler, 2008) (Surendran and Wheatley, 1998;Friedler et al, 2006;Gilboa and Friedler, 2008;Nolde, 2000;Friedler et al, 2005;Lamine et al, 2012;Hourlier et al, 2010;Ronen et al, 2010;Pidou et al, 2008;Zhang et al, 2009) Note: * indicates only one cited literature source reported the data. that the use of siliceous soil in SP-VFWs and SB-VFWs has met with limitations due to relatively low hydraulic conductivity and its tendency to clog (Platzer and Mauch, 1997;Zhao et al, 2009).…”