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During the remainder of the first anoxic phase, further decrease in the concentration of N-NO x – or any other inflexion in the DO or ORP profile was not observed.
The temperature of the wastewater in the reactor was the same as laboratory temperature, it was ranged between During the remainder of the first anoxic phase, further decrease in the concentration of N-NO x – or any other inflexion in the DO or ORP profile was not observed. Universidad Centroccidental Lisandro AlvaradoVenezuela.
With respect to the oxidized forms of ammonium, nitrites and nitrates N-NO x -a remaining concentration of The most widely used coagulant agents for tannery wastewaters are aluminum and iron salts. No registered users and 9 guests.
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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 integrated system for the treatment of tannery wastewater operated continuously for 90 days. 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.
It is reported that the ORP value is correlated with the logarithm of the DO concentration in a linear relationship During physicochemical treatment, the concentrations of FeCl 3. An integrated wastewater treatment was evaluated for nitrogen and Oficcial removal from a tannery effluent.
Similar results were obtained by Yu et al. These can be used to identify specific control oficoal during the SBR cycle. Finally, profiles of ORP, DO and pH could be related with nitrification and denitrification processes, then these profiles vaceta efficient ways to monitor the evolution of biological nutrient removal, and real-time control can be implemented for optimization of the SBR operation.
After 35 days of operation of the combined treatment, the system efficiency was improved slightly to It was demonstrated that the limiting step to remove nitrogen during biological treatment was ammonification, but the remained organic nitrogen was removed during the ulterior physicochemical treatment.
This was a clear indicator that there could have been a problem with the biological process or some changes could have happened in the composition of the wastewater. Besides, N-NO 5012 – concentration decreased slightly to 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.
The low organic nitrogen transformation is related to the results obtained by Insel et al.
Nitrogen and cod removal from tannery wastewater using biological and physicochemical treatments
Monitoring the biological nutrient removal from wastewaters has been considered difficult due to the lack of available control parameters. This result shows the capacity of the biological system to denitrify N-NO x.
It was considered there was a good correspondence with the minimum gacefa potential recorded mVpH inflexion and the minimum concentration of N-NO x – Who could help me? This efficiency was slightly lower than total biodegradable COD of the raw wastewater However, a recovery of the biological process was observed from day 41 of the treatment; although it was not until day 49 of the SBR operation when the nitrogen removal efficiencies were stable yaceta At the same time, dissolved oxygen profile was gacwta to verify aerobic or anoxic conditions during SBR cycle.
Additionally, the small volume of the reactor and the use of a fine bubble diffuser helped to keep DO at high concentrations. The reactor had three openings: Furthermore, some researchers aimed to evaluate the effects of coagulants obtained from natural sources and agro-industrial byproducts such as Ryu et al.
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In this regard, Antileo et al. The tannery wastewater experimental system was integrated by the combination of two processes biological and physicochemical treatments and the agceta was operated during 90 days to remove the organic matter and nitrogen from the wastewater.
At the same time, dissolved oxygen profile was performed to verify aerobic or anoxic conditions during SBR cycle. 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.
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. Anoxic condition was achieved during the first phase in the SBR cycle with average DO concentration of 0.
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The efficiency of removal of COD, total nitrogen and chromium in the integrated system was reported by means of central tendency and dispersion. Dissolved oxygen concentration was gradually increased from 0. Gaceta Oficial Nmero The SBR reactor was a glass-made cylinder 26 cm height and Ammonia concentration increased from Results and discussion The integrated system for the treatment of tannery wastewater operated continuously for 90 days. 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.
Besides, N-NO x – concentration decreased slightly to In this regard, Boursier et al.
Physicochemical composition of the raw tannery wastewater. The sampling frequency was established in a weekly basis for SBR, on-line measurements and post-treatment.