Biogas produced from wastes is regarded as advanced biofuel and is under current EU regulation, promoting the growth of advanced biofuels. In this study, the authors focused the research on the potential of a pig farm and an adjacent slaughterhouse and meat processing enterprise to produce not only meat, but energy as well, through anaerobic digestion of wastes produced during current activities to produce biogas as energy carrier. One had assessed the potential of a pig�s farm and an adjacent slaughterhouse and meat processing enterprise to produce biogas as energy carrier, using anaerobic digestion of wastes generated in production activity. All experiments were carried out on a performing lab device. The results indicate solid sludge and fats resulted from slaughterhouse are capable to produce high yields of methane, reported to dry organic matter. Although organic wastes resulted from slaughterhouse can generate high quantities of methane by anaerobic digestion, large quantities of organic wastes are generated in the assessed pig�s farm and the potential for energy production is much higher in the case considering as source the pig�s farm than slaughterhouse. Finally, one demonstrated that by combining organic wastes generated in the pig�s farm with the organic wastes resulted from slaughterhouse, or organic wastes generated in the pig�s farm with the biomass produced on 200 hectares of triticale as short rotation crop, one can supply the energy source, necessary to operate an one-megawatt installed power biogas plant.

The present paper focuses on conducting research, based on physical, chemical analysis of treated sludge from the waste water treating systems and on physical, chemical and pedological analyzes on sterile material (soil), achieved in order to turn both residues, by mixing and a mutual treatment, into an useful, friendly environmental material, useful for further cultivation. One determined in situ probes from the Lupeni sterile dumps different characteristics such as: thickness of the soil layer, its physiological width, structure and porosity, permeability, humidity, soil reaction, effervescence with HCl, the nature of humus, soil texture, the presence, nature and abundance of soluble salts. Further one researched on electrokinetic�s disintegrated sludge, and applying ultrasonic technology, and concluded about the possibility of using the sludge on the degraded lands of the Jiu Valley. The sludges from the purification contain: clay particles entrained by street water into the sewer network; organic substances from domestic sewage and human manure; soluble / insoluble salts; various species of cat-ions and an-ions retained by the colloidal fraction of organic or mineral nature and microorganisms. As result, the tests demonstrated the improved soil quality on degraded lands by fertilizing with purified sludge. The superior growth of platelets in sterile mixture vessels and 75 % fermented sludge, versus experimental samples with 75 % sterile material. The use of sludge treated in land conversion has a unit cost of 210 � 250 euros/ tonne dry substance (d.s.).