Conference Papers

No more cinder was deposited on the dumb starting with 2004. The environmental balance indicates an overflow of heavy metals admitted in soil that shown a major possible pollution. The wastes mining-metallurgical deposits are a continuous pollution source for environment and human habitat. The physical pollution is manifested through the increase of air-floated and sedimentary powders atmosphere content while the chemical pollution is due to the content of the dumper ash in chemical compounds. The surface water, groundwater, soil, vegetation and the leaving area are the pollution receiver. Also, there is the danger of the West and North flank to debris-slide, the last one with the blocking-up of the river bottom.

The predominant organisms of the sludge determined the efficiency of the biological treatment with a high organic load in the plant. The alteration of activated sludge health determined the destruction of granular flocks and the forming of filamentous structures because of the filamentous bacteria or some fungi multiplication. The filamentous structure determines the swelling of the sludge and reduction of its capacity to decompose organic matter. Swelling of the sludge is determined by the dominance of bacteria belongings Zooglea genus which secrets abundant extracellular material with high degree of hydration. The most practical solution to revive the activated sludge in an excess aeration, which leads to a higher oxygen content. To stimulate the microbial activity the biodegradable organic carbon compounds were supplemented. Molasses addition provides a high input of biodegradable organic carbon, which is necessary when BOD5 is low and the ammonium quantity is high.

The wastewater containing TPH (total petroleum hydrocarbons), can not be discharged untreated due to the toxic loading. These substances are potential sources of contamination of soil and water. Primary treatments of these waste waters require a coagulation stage. The classical coagulation agents reduce turbidity and partially, the dissolved substances content. In this study, optimized coagulation process was obtained through the use of metal salts and bioflocculants. Use of chitosan-Al-compounds has reduced by more than 50% of the dose for Al salts and has produced effective reduction of petroleum products by up to 10% higher.