GACETA OFICIAL 5021 PDF

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Results of the tertiary treatment showed the efficiency of the coagulation-flocculation process during Oficisl removal Figure 3. The duration of a complete SBR operation cycle was 12 h.

Introduction Wastewater generated in tannery industry is one of the most polluting effluents due to the presence of large amounts haceta heavy metals chromiumchloride, ammonia, and organic substances 1 2. These results confirm that ORP is an appropriate indicator of nitrification progress in the system. Similar results were obtained by Yu et al.

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During the investigation, a mix of reagents was used: Samples were taken hourly during the SBR cycle to determine the population density of nitrifying and denitrifying bacteria present in the reactor. After the anoxic phase, the aerobic period started at minute of the SBR cycle. The system was able to produce gaecta effluent which met the COD and total nitrogen limits established in the venezuelan legal regulations for discharge into water bodies.

Anoxic condition was achieved during the first phase in the SBR cycle with average DO concentration of 0.

An integrated wastewater treatment was evaluated for nitrogen and COD removal from a tannery effluent. The system was conformed by the combination of a biological treatment using a sequencing batch reactor SBR followed by a physicochemical faceta based in a coagulation-flocculation process. To guarantee the correct determination of the end of nitrification process, it is essential to verify the simultaneous occurrence of the two breaking points in both profiles.

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To begin the biological process, the SBR was seeded with biomass from the aeration tank of a tannery treatment plant located in the city of Yaritagua, Venezuelawhich employed a continuous flow suspended growth configuration. To remove these pollutants, it is necessary to gacceta at least a physical-chemical treatment as a polishing step after a biological treatment 1 15 For sowing, the most probable number technique MPN was utilized, using a selective medium for each group of bacteria.

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To begin the biological process, the SBR was seeded with biomass from the aeration tank of gzceta tannery treatment plant located in the city of Yaritagua, Venezuelawhich employed a continuous flow suspended growth configuration.

The final contaminant concentrations were compared with Venezuelan environmental regulations to determine whether they reached the limits for discharge into water bodies The results of on-line and physicochemical measurements were supplemented by basic microbiological analysis, which determined the bacterial density of nitrifying and denitrifying microorganisms present in the mixed liquor Figure 7.

The brine is an agro-industrial waste generated in obtaining salt by solar evaporation. Additionally, the small volume of the reactor and the use of a fine bubble diffuser helped to keep DO at high concentrations.

Ammonium and nitrate broth Fluka Analytical were used for nitrifying and denitrifying bacteria, respectively, in accordance with Standard Methods Dissolved oxygen concentration was gradually increased from 0. Ammonium and nitrate broth Fluka Analytical were used for nitrifying and denitrifying bacteria, respectively, in accordance with Standard Methods Anoxic condition was achieved during the first phase in the SBR cycle with average DO concentration of 0. This alteration in ORP profile corresponded to the sudden increase in the concentration of nitrogen in the tannery wastewater Figure 4and it was due to changes in the production process at the industry.

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In this regard, Antileo et al. This probably corresponds to recalcitrant or non-biodegradable nitrogen that could not be hydrolyzed The SBR system operated according odicial anoxic-aerobic-anoxic principles. Baceta concentration decreased during the second anoxic phase until The Jar-Test proceeded with the following steps and temporization: The purpose of this combination was to generate an effluent which meets the 502 limits established in the Venezuelan environmental regulations.

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Ammonification is recognized as a specific feature of the tannery effluents due to the high content of organic nitrogen present in proteins 12 18 At the beginning, the average COD removal efficiency was Cycles evaluated in the SBR showed the efficiency of the biological system for nitrification, but showed its inefficiency to perform the ammonification of the organic nitrogen present in tannery wastewater.

The purpose of oflcial combination was to generate an effluent which meets the discharge limits established in the Venezuelan environmental regulations. Nitrogen and cod removal from tannery wastewater using biological and physicochemical treatments. Thank you very much. Concentration and doses of ferric chloride and sour brine were: The pH of the wastewater treated oricial was adjusted to In addition, densities of nitrifying and denitrifying microorganisms in the mixed liquor were evaluated during the biological treatment.

Finally, the effectiveness of ORP, pH and DO profiles as control parameters for monitoring the evolution of biological nutrient removal during the SBR cycle was investigated.

Cycles evaluated in the SBR ofifial the efficiency of the biological system for nitrification, but showed its inefficiency to perform the ammonification of the organic nitrogen present in tannery wastewater. Results of the tertiary treatment showed the efficiency 0521 the coagulation-flocculation process during COD removal Figure 3.

The presence of nitrifying microorganisms tended to increase its density during the aerobic phase of the biological treatment. Will be grateful for any help! During physicochemical treatment, the concentrations of FeCl 3. They could be implemented as a real-time control for optimization of the SBR operation, because length of each phase in the reactor could be adjusted to the time when inflexions in the profiles occur.