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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.
Figure 2 COD behavior during the biological treatment of tannery wastewater. The principle diagram of the biological system with all major components is shown in Figure 1.
It is characterized by being rich in magnesium sulfate and potassium chloride, which are important agents during coagulation-flocculation process. In some cases, experimental determination could not be done at the same time when the inflexion profile was measured on-line, due to the tedious and time consuming experimental analysis 7. The system was conformed by the combination of a biological treatment using a sequencing batch reactor SBR followed by a physicochemical treatment based in a coagulation-flocculation process.
Ammonification is recognized as a specific feature of the tannery effluents due to the high content of organic nitrogen present in proteins 12 18 Therefore, ORP profile can be used as a strategy to monitor the progress of the nitrification process and even estimate the achieved percentage of ammonia removal.
Profiles of ORP, DO and pH were efficient ways to monitor the evolution of biological nutrient removal and real-time control can be implemented in order to optimize the SBR operation. Dissolved oxygen DOpH and oxidation-reduction potential ORP were used to monitor biological nutrient removal process in the reactor.
These results confirmed that the predenitrification strategy with a short filling period was a good selection for the tannery wastewater treatment due to the fact that the readily biodegradable COD present in raw wastewater was not consumed during the filling time. Thus, the low rate of ammonification was considered one of the main reasons that impeded a higher total nitrogen removal from the tannery effluent in the SBR.
Results of the tertiary treatment showed the efficiency of the coagulation-flocculation process during COD removal Figure 3. Both coagulant and adjuvant agents were added at the beginning of the vigorous mixing. For this magazine there is no download available.
Finally, profiles of ORP, DO and pH could be related with nitrification and denitrification processes, then these profiles were efficient ways to monitor the evolution of biological nutrient removal, and real-time control can be implemented for optimization of the SBR operation.
Finally, density of nitrifying bacteria was greater than density of denitrifying bacteria during biological treatment. The presence of nitrifying microorganisms tended to increase its density during the aerobic phase of the biological treatment.
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The low organic nitrogen transformation is related to the results obtained by Insel et al. Additional anoxic phase was included to improve nitrogen removal; no external carbon source was needed. At the beginning, the average COD removal efficiency was In addition, densities of nitrifying and denitrifying microorganisms in the mixed liquor were evaluated during the biological treatment.
The integrated treatment system which combined oficil and physicochemical physicochemical processes for the treatment of tannery wastewater has been proved to be an efficient alternative to remove COD and TN. Introduction Wastewater generated in tannery industry is one of the most polluting effluents due to the presence of large amounts of heavy metals chromiumchloride, ammonia, and organic substances 1 2.
Gaceta Oficial Digital ; No. Gacceta tannery wastewater experimental system was integrated by the combination of two processes biological and physicochemical treatments and the system was operated during 90 days to remove the organic matter and nitrogen from the wastewater.
Characteristics of coagulant and adjuvant as color Cturbidity Bcalcium Ca-Bmagnesium C and Mg-B and chloride Cl – -D were measured following the procedures of Standard Methods This suggests the presence of heterotrophic microorganisms in the SBR biomass, which could simultaneously perform nitrification and denitrification processes This concentration corresponded with three inflexions in the profiles.
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Dissolved oxygen DOpH and oxidation-reduction potential ORP were used to monitor biological nutrient removal process in the reactor. According to this gacets, it should be determined in future research if the cause of a lack of ORP breakpoint in the second anoxic phase is related to the fact that the N-NO x – was not completely consumed.
Aeration was supplied through an air compressor EliteHagen inc, China. The sampling frequency was established in a weekly basis for SBR, on-line measurements and post-treatment. The final contaminant concentrations were compared with Venezuelan environmental regulations to determine whether they reached the limits for discharge into water bodies No registered users and 9 guests.
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This concentration decreased during the second anoxic phase until At this foicial, ammonium concentration remained constant and any further inflexion was observed in the profiles for the rest of the aerobic phase, indicating that nitrification process was completed 9. Conventional wastewater treatments have been used to treat tannery effluents, based on physical-chemical treatments; however, these strategies cause an important increase in the cost of the treatment 3.
Microbiological analysis 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. Thank you very much.
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The biomass was acclimated to the wastewater characteristic and SBR conditions for a period of 40 days. At this point, ammonium concentration remained constant and any further inflexion was observed in the profiles for the rest of the aerobic phase, indicating that nitrification process was completed 9.
Results of the tertiary treatment showed the efficiency of the coagulation-flocculation process during COD removal Figure 3.
Fri Sep 25, 8: Thus, the amount of chemicals required during post-treatment was reduced, since the coagulant was added based on the concentration of colloidal contaminants remaining in the biological process. Eight hours after the cycle began, nitrification removal efficiencies reached the highest value