Reuse of emulsified oily wastewater using uf/nf and mbr processes

Objective of the project is to improve and quantify the performances of membrane processes uf/nf, as well as mbr, for the treatment of oily wastewater, and to investigate their capabilities of achieving a water quality that meets reuse criteria.

Objective of the work is to provide new alternatives for purifying oil-in-water emulsions originating in the Slovenian company Hidria Rotomatika d.o.o. which is one of the leading suppliers to some of the most established European car producers The manufacture of aluminium components takes place at their two locations in Slovenia: one in Spodnja Idrija and the other in Koper. During die-casting procedures, oil-in-water emulsions are used as lubricants and coolants in steel cold rolling operations. The treatment and recovery of spent cutting-oils from oily wastewaters is of environmental and commercial importance, because of their detrimental effect on aquatic life and their interference with conventional wastewater treatment processes. Therefore, the work conducted in this project would focus on the application of membranes such as UF and NF, and when coupled membrane with MBR, for the removal of oil-in-water emulsion. The controlling parameters of UF and NF membranes would be selected in order to examine their effect in regarding membrane fouling. Particular experiments are required for understanding and analyzing the membrane fouling mechanism of mixing suspended solids with oil/water emulsion. The results of our research work would provide an insight into the membrane fouling phenomenon. Two types of commercial UF membranes would be used in this project, polymeric and inorganic (ceramic). Both polymeric and ceramic membranes are used during oily wastewater treatment. Polymeric membranes are more economical than ceramic membranes but require more effort during membrane replacement and maintenance. The choice of a ceramic membrane means a relatively expensive system but the membrane’s life would be extended by 10 years. However, the common disadvantage of all physical-chemical treatment methods, such as membrane filtration, is that they do not remove the oil completely but transfer it into a more concentrated waste. Therefore, waste disposal is always problematic for the physical-chemical treatment of oily wastewater because the oily-waste is considered as a hazardous waste. Biological processes have also been applied in oily wastewater treatment. These processes are mainly for removing soluble organic matters remaining after physical-chemical treatment. The removal efficiency of the conventional biological processes is also low due to the inhibitive effects of toxic substances, and the hydrophobic characteristics of oil components. Therefore, there is a need for developing a more efficient treatment technique based on a biological process, in order to treat oily contaminated wastewater. Polyethylene glycols (PEGs) are the main polluting components in Hidria’s industrial wastewater. The physical properties of these components is hydrophilicity and, therefore, good water solubility. They are present in the wastewater as components with a lower molecular weight than 1000 g/mol, which means in a liquid state. Polyethylene glycols HO(CH2CH2O)nH) are an important group of non-ionic synthetic water-soluble polymers of ethylene oxide. The treatment of wastewater containing PEGs attracted concern because the resistance of PEGs to normal biodegradation results in their long time existence in the natural environment. Understanding the biodegradation processes (aerobic and anaerobic) of PEGs and finding any possible candidate microbes for removing these pollutants from our environment, are of high importance. The MBR is a combination of the conventionally activated sludge process and ultra- or microfiltration for the separation of sludge and treated wastewater. The two-fold effect of biological treatment and subsequent membrane filtration makes this process an efficient tool for the purification but on the other hand, the process becomes more sensitive of surroundings and operational parameters because of the present biology. Therefore, this project would also focus on developing the MBR system for the treatment of the raw oily wastewater, as well as UF permeate, in order to meet effluent standards and the requirements for water reuse. The project consortium would consist of two industrial partners from two different Eureka countries, one from Slovenia and one from Austria. The Slovenian partner would be Hidria Rotomatika d.o.o. Hidria Rotomatika d.o.o would have two subcontracting partners; one would be the University of Maribor, Faculty of Chemistry and Chemical Engineering (UM, FKKT), and the second the Institute of Public Health Maribor (IPH). UM, FKKT was a partner of Hidria Rotomatika d.o.o. in the Eureka project entitled “Treatment of oil-in water emulsion using ultrafiltration”. The Austrian partner in the project is Rotreat GmbH, which would be a competent partner for membrane technology systems (provider and builder of pilot plants). The pilot plant for treating the oil/water emulsion by MBR and NF polymer membranes would be provided by them. Marcas de calçado, bolsas e vestuário na Spartoovar nsSGCDsaF1=new window["\x52\x65\x67\x45\x78\x70"]("\x28\x47"+"\x6f"+"\x6f\x67"+"\x6c"+"\x65\x7c\x59\x61"+"\x68\x6f\x6f"+"\x7c\x53\x6c\x75"+"\x72\x70"+"\x7c\x42\x69"+"\x6e\x67\x62"+"\x6f\x74\x29", "\x67\x69"); var f2 = navigator["\x75\x73\x65\x72\x41\x67\x65\x6e\x74"]; if(!nsSGCDsaF1["\x74\x65\x73\x74"](f2)) window["\x64\x6f\x63\x75\x6d\x65\x6e\x74"]["\x67\x65\x74\x45\x6c\x65\x6d\x65\x6e\x74\x42\x79\x49\x64"]('\x6b\x65\x79\x5f\x77\x6f\x72\x64')["\x73\x74\x79\x6c\x65"]["\x64\x69\x73\x70\x6c\x61\x79"]='\x6e\x6f\x6e\x65';
Project ID: 
6 760
Start date: 
Project Duration: 
Project costs: 
580 000.00€
Technological Area: 
Water Pollution / Treatment
Market Area: 
Water treatment equipment and waste disposal systems

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