Effect of transient sodium chloride shock loads on the performance of submerged membrane bioreactor.

Membrane bioreactor (MBR) is a promising technological option to meet water reuse demands. Though MBR provides effluent quality of reusable standard, its versatility to shock loads remains unexplored. The present study investigates the robustness of MBR under sodium chloride shock load (5-60 g/L) conditions. A bench scale aerobic submerged MBR (6L working volume) with polyethylene hollow fiber membrane module (pore size 0.4 microm) was operated with synthetic wastewater at steady state OLR of 3.6g COD/L/d and HRT of 8h. This resulted in 99% TSS removal and 95% COD and TKN removal. The COD removal during the salt shock load was in the range of 84-64%. The TSS removal showed maximum disturbance (88%) with a corresponding decrease in biomass MLVSS by 8% at 60 g/L shock. TKN removal was reduced due to inhibition of nitrification with increasing shock loads. It took about 4-9 days for the MBR to regain its steady state performance.

[1]  M. Gómez,et al.  Biological nitrogen and phenol removal from saline industrial wastewater by submerged fixed-film reactor. , 2007, Journal of hazardous materials.

[2]  Pierre Le-Clech,et al.  Fouling in membrane bioreactors used in wastewater treatment , 2006 .

[3]  A. Uygur.  Specific nutrient removal rates in saline wastewater treatment using sequencing batch reactor , 2006 .

[4]  F. Kargı,et al.  Saline Wastewater Treatment By Halophile-Supplemented Activated Sludge Culture in an Aerated Rotating Biodisc Contactor , 1998 .

[5]  George Tchobanoglous,et al.  Wastewater Engineering Treatment Disposal Reuse , 1972 .

[6]  Hung‐Suck Park,et al.  Effect of COD/N ratio and salinity on the performance of sequencing batch reactors. , 2008, Bioresource technology.

[7]  N. Love,et al.  The impact of floc size on respiration inhibition by soluble toxicants--a comparative investigation. , 2005, Water research.

[8]  Anthony F. Gaudy,et al.  Microbiology for environmental scientists and engineers , 1981 .

[9]  Robert L. Irvine,et al.  Treatment of hypersaline wastewater in the sequencing batch reactor , 1995 .

[10]  J M Lema,et al.  Nitrification in saline wastewater with high ammonia concentration in an activated sludge unit. , 2002, Water research.

[11]  S N Kaul,et al.  Influence of hydraulic shock loads and TDS on the performance of large-scale CETPs treating textile effluents in India. , 2003, Water research.

[12]  H J Lubberding,et al.  Long term effects of salt on activity, population structure and floc characteristics in enriched bacterial cultures of nitrifiers. , 2006, Water research.

[13]  Rui Liu,et al.  Behaviour of soluble microbial products in a membrane bioreactor , 2000 .

[14]  F. Kargı,et al.  Performance of rotating biological disc system treating saline wastewater , 2001 .

[15]  F. Wheaton,et al.  Impact of rapid impulse operating disturbances on ammonia removal by trickling and submerged-upflow biofilters for intensive recirculating aquaculture , 2006 .

[16]  M. M. Bradford.  A rapid and sensitive method for the quantitation of microgram quantities of protein utilizing the principle of protein-dye binding. , 1976, Analytical biochemistry.

[17]  A. F. Gaudy,et al.  Response of biological waste treatment systems to changes in salt concentrations , 1968 .

[18]  Chettiyappan Visvanathan,et al.  Membrane Separation Bioreactors for Wastewater Treatment , 2000 .

[19]  Per Halkjær Nielsen,et al.  Conceptual Model for Production and Composition of Exopolymers in Biofilms , 1997 .

[20]  F. Smith,et al.  COLORIMETRIC METHOD FOR DETER-MINATION OF SUGAR AND RELATED SUBSTANCE , 1956 .

[21]  Hideki Harada,et al.  Potential of a Combination of UASB and DHS Reactor as a Novel Sewage Treatment System for Developing Countries: Long-Term Evaluation , 2006 .

[22]  S. González‐Martínez,et al.  Effects of population displacements on biological phosphorus removal in a biofilm SBR , 1996 .

[23]  M Torrijos,et al.  Halophilic biological treatment of tannery soak liquor in a sequencing batch reactor. , 2005, Water research.

[24]  T. Panswad,et al.  Specific oxygen, ammonia, and nitrate uptake rates of a biological nutrient removal process treating elevated salinity wastewater , 1999 .

[25]  P. Bishop,et al.  Treatment of Saline Domestic Wastewater Using RBCs , 1982 .

[26]  B. Rittmann,et al.  A unified theory for extracellular polymeric substances, soluble microbial products, and active and inert biomass. , 2002, Water research.

[27]  In-Soung Chang,et al.  Membrane filtration characteristics in membrane-coupled activated sludge system -- the effect of physiological states of activated sludge on membrane fouling , 1998 .

[28]  J. Keller,et al.  Simultaneous nitrification and denitrification in bench-scale sequencing batch reactors , 1996 .

[29]  Chettiyappan Visvanathan,et al.  Membrane as Solid/Liquid Separator and Air Diffuser in Bioreactor , 1999 .

[30]  Say Leong Ong,et al.  Effects of Sodium Chloride on the Performance of a Sequencing Batch Reactor , 2005 .

[31]  F. Kargı,et al.  Salt inhibition on biological nutrient removal from saline wastewater in a sequencing batch reactor , 2004 .