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Membrane Technology for Cleanup of Liquids

#2080


Electrochemically Enhanced Membrane Technology to Cleanup Technological Solutions from Oil, Grease and Mixed Waste

Tech Area / Field

  • ENV-RED/Remediation and Decontamination/Environment
  • CHE-IND/Industrial Chemistry and Chemical Process Engineering/Chemistry

Status
3 Approved without Funding

Registration date
12.01.2001

Leading Institute
State Enterprise Krasnaya Zvezda, Russia, Moscow

Collaborators

  • Moss Maritime, Norway, Lysaker

Project summary

Now ultrafiltration is the most promising method of different industrial wastes cleaning up. Special interest to this method has arisen when metal ceramic composite “Trumem” membranes appeared at the market. These membranes have nearly absolute resistance to any aggressive influences of the separated media. “Trumem” membranes have Russian priority and industrial production at Moscow Production Enterprise “Ultram” which is a part of State Enterprise “Krasnaya Zvezda”. These membranes are well recognized in Russia and in developed western countries.

However, there are some industrial wastes which can be poorly cleaned up by means of ultrafiltration even when “Trumem” membranes are used. Some of these wastes are: used up detergents of engineering and maintenance enterprises of such industries as automobile, military industrial complex, atomic, oil processing and others. The problem is that wastes of complicated composition block membrane surface which requires chemical regeneration of membranes or even their replacement. Nevertheless, there is a growing interest to ultrafiltation in the above mentioned industries because of substantial advantages of this method as compared to traditional ones.

The demand of membrane units in these industries, and in any others, will increase if the problem of membranes blocking is solved. It means that there will be put an end on reagents consumption, secondary wastes, membrane life time will be many times longer and even replacement of membranes won’t be necessary. Such a task has been multiply set by manufacturers and technologists. More serious requirements to environment protection from industrial wastes make the problem more acute.

The aim of the given project is to develop the methods solving this matter. Scientific-technical approach to this problem is in modification of the initial solution (that has to be cleaned up) before its introduction into the membrane apparatus for separation. Modification has to be carried out in each concrete case depending on the solution components by one or a combination of the following ways:

– chemical modification of solutions by means of chemical reagents introduction to the initial mixture. These regents are: acids, alkalines, complexones, precipitators, floculants, etc.;

– colloid-chemical modification of solutions by means of changing of standard-unit state of initial mixture components up to the stage of colloid system formation. Here we deal with micro-emulsions, suspensions, water soluble polymers, surface active substances micelles, flotation, coagulation and micro-capsulation processes;

– electro-chemical modification of solutions by means of their treatment in electro-lysers, electro-flotators, electro-correctors and other apparatuses of this type. Electro-chemical influence is attractive by not introducing any additional substances into the mixture;

– physical modification of solutions by means of electro-magnetic fields of different frequency (resonance regimes included) influence on these solutions;

– modification of semi-conductive membranes themselves by means of outer charge application to them, by means of adsorption and chemical change of hydrophilic- hydrophobic ratio.

The authors believe that scientific and technological experience accumulated as a result of this project fulfillment, will allow to solve any problem connected with ultrafiltration application. For this project fulfillment we collected scientists and engineers who have the experience in material technology, in the use of ultrafiltration in atomic energy, in solution of ecological problems and in chemical technology. Regarding this project as a conversional one, one can surely forecast its applicability.

The obtained results will be widely applied in the industry- at stations of galvanic and other coatings, in instrument making, in automobile and car maintenance industry, in oil processing and oil transportation, etc. Combination of the obtained results of solutions modification with “Trumem” membranes and, finally, with membrane apparatuses of American company “SpinTek” (the basis of which is membrane centrifuge principle) may as a result give a break through at the market of membrane technologies and apparatuses.


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