Efficiency of mechanical pre-treatment on European MBR plants

Schier, W.; Frechen, Franz-Bernd; Fischer, S.

doi:10.1016/j.desal.2007.10.054

Cited by 26 publications

(14 citation statements)

References 2 publications

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“…Also in combination with membrane bioreactors (MBR) sieves are used to optimise operation of the membrane performance. In this case a larger mesh of 0.8e2 mm, is applied Schier and Frechen, 2008). Interestingly we observed in initial tests that cellulose fibres form the major fraction of removed COD.…”

Section: Introductionmentioning

confidence: 93%

Sieving wastewater – Cellulose recovery, economic and energy evaluation

Ruiken¹,

Breuer

Klaversma³

et al. 2013

Water Research

163

132

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Section: Introductionmentioning

confidence: 93%

Sieving wastewater – Cellulose recovery, economic and energy evaluation

Ruiken¹,

Breuer

Klaversma³

et al. 2013

Water Research

163

132

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“…Ragging (or 'braiding') is the term used to define the blocking of membrane channels with particles agglomerated as long rag-like particles (Mason et al 2010;Judd 2on). It is more relevant in municipal wastewater treatment plants, since the rags are primarily made up of cellulosic fibres and hairs Schier et al 2009;Stefanski et al 2on), possibly relating to the disposal of cotton woolbased products to sewer (Stefanski et al 2on). Sludge quality strongly depends on feed sewage characteristics, and it has been assumed by most practitioners that the clogging propensity relates primarily to the level of pretreatment applied (Itokawa et al 2008;Lesjean et al 2009;Brepols et al 2010).…”

Section: Introductionmentioning

confidence: 98%

Ragging phenomenon characterisation and impact in a full-scale MBR

Gabarrón

Gómez

Monclús

et al. 2013

Water Science and Technology

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Although there are few studies about clogging phenomenon in the peer-reviewed literature, it is considered one of the main operational challenges by membrane bioreactor (MBR) practitioners. This study presents data from the performance of a full-scale MBR affected by clogging, and ragging in particular. An evaluation of the efficiencies of different applied cleaning methods revealed the acid recovery cleaning to be more efficient than the basic recovery cleanings, although all maintenance cleanings were largely ineffective in recovering membrane permeability. Only declogging cleaning through the manual removal of the accumulated solids was found to be efficient, indicating that such solids were substantially unremoved by chemical cleaning. Moreover, reclogging following manual cleaning demonstrated a propensity for rapid clogging - within a period of 10 days over which the permeability returned to 68 and 88% of the pre-cleaned state. The analysis of the feedwater indicated suspended textile fibres (>70% cotton) to be present at a concentration of more than 40 mg·L(-1), ∼90% being smaller than 1 mm (0.06-0.4 mm). These small lengths of filaments evidently pass through pre-treatment and are retained on the membrane surface, forming 'rags' within the membrane module, notwithstanding the routine high quality of sludge reflected in the capillary suction time and filterability measurements. Pre-treatment improvement, manual cleaning and permeate flux reduction are the only options to minimise ragging impact over MBR performance.

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“…Recently, membrane bioreactor (MBR) technology has offered many benefits over the traditional activated sludge process such as space-saving, high quality of treated effluent, less sludge wastage, and high potential for biological nutrient removal [1][2][3][4]. The necessity of a pretreatment step for the MBR plant was also previously suggested [5][6][7]. This research work focuses on the removal of carbon, nitrogen, and phosphorus by the developed anaerobic baffled reactor-membrane bioreactor (ABR-MBR) as a compact decentralized wastewater recycling system.…”

Section: Introductionmentioning

confidence: 99%