Obiettivo The results obtained show that it is absolutely necessary, in the case of the treatment of oily sludges such as those studied here, to entirely separate two problems:- the problem of the pollution solubilisation by the contact of the waste material with water, such as it may be simulated by laboratory lixiviation tests,- the problem of the physical state of the treated waste material, which conditions its medium- or long-term possibilities for handling and intermediate stocking (lagoon, slag-heap, dumping site).Among all studied techniques of chemical conditioning, the use of quick lime seems to be the most efficient for solving the first of the above two problems. Such a treatment has an already important efficiency for lowering the solubilizable potential (about 45% for COD and salinity), for doses as low as 5% of the mass of crude waste to be treated.The solution of the second problem requires the addition of powdery solid reagents. Only two classes of reagents seem to be suitable: utilization of quick lime (or of a material containing quick lime) in high doses, or use of organic materials absorbing oily substancesThe iron industry consumes large quantities of various oils and greases for such objectives as rolling, lubrication, protection, hydraulic drive. For this reason, it also produces important quantities of waste oils and greases. Their centralized treatment is already realized or organized in numerous steelworks and this leads to the recirculation of the major part of these oils and greases as fuel or noble materials. There nevertheless remain certain oily and greasy waste substances which can technically and economically neither be utilized as fuel, nor be regenerated. For these waste materials, only two possibilities are presently available to the operator: either to give them to specialized removing organizations, and this rapidly becomes prohibitive; or to stock them in special tanks or lagoons, and this is already or shall at a short date be prohibited, because of the pollution risks for soils and groundwater tables.It was thus compulsory to look for other ways. This is the aim of the present research, the general objectives of which are:- the development of a simple treatment and conditioning technique for non-valorizable oily sludges and emulsions, in view to obtain a final waste product which can be stocked and removed without any risk for the environment (surface and groundwater, soils, atmosphere),- the exploitation of the way consisting to apply, as a pre-treatment, the addition of chemical reagents and physical separations, with the exception of solvent extraction and distillation, which should not be considered here for economical reasons of inadequacy for little valorizable waste materials.In order to limit the subject and to obtain rapidly valorizable results, the following priorities were chosen:- An absolute priority is conferred to the solution of the problem of resorption of oily sludge deposits, relatively to that of the treatment of oily sludges by their production, as the quantities relating to the first point are much more important,- The older oily sludge deposits present a stratified structure: a supernatant oil layer, the separation and valorization of which may be most easily considered; a layer of polluted water, enabling the application of classical techniques of waste water treatment; an underlying layer of sediment impregnated with oils and greases difficult separate and valorize. Priority is attributed to the treatment of this latter layer, as the site reclamation is conditioned by its resorption.- The studied techniques must cover the resorption on the site and the treatment with handling, transport and external disposal of the material. Programma(i) ECSC-WORKENV 5C - Fifth research programme (ECSC) "Technical control of nuisances and pollution at the place of work and in the environment of iron and steel works", 1985-1989 Argomento(i) 4 - Wastes Invito a presentare proposte Data not available Meccanismo di finanziamento Data not available Coordinatore INSTITUT DE RECHERCHES HYDROLOGIQUES Contributo UE Nessun dato Indirizzo 11 bis rue Gabriel Peri 54515 Vandoeuvre Francia Mostra sulla mappa Costo totale Nessun dato
