GACETA OFICIAL 5021 PDF

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The coagulation-flocculation process is one of the most frequently used treatments for tannery wastewater, but it is usually applied as pretreatment 14 17 This behavior evidenced that denitrification had occurred.

The duration of a complete SBR operation cycle was 12 h. This concentration decreased during the second anoxic phase until The main phases in the SBR were anoxic filling, reaction phase anoxic – oxic – anoxicsettling and decanting, no external carbon source was added.

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Tannery wastewater, biological treatment, physicochemical treatment, nutrient removal, online monitoring, bacterial density. The pre-treated wastewater was used as feed to the SBR. The coagulation-flocculation process is one of the most frequently used treatments for tannery wastewater, but it is usually applied as pretreatment 14 17 To remove this COD it was necessary to apply an additional treatment.

The presence of nitrifying microorganisms tended to increase its density during the aerobic phase of the biological treatment.

Conclusions The integrated treatment system which combined biological 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. Ammonia concentration increased from Dissolved oxygen concentration was gradually increased from 0.

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Gacetz of them was in the ORP profile at the maximum value of mV, the second was an inflexion in pH profile ammonium valley at pH of 8. Results and discussion The integrated system for the treatment of tannery wastewater operated continuously for 90 days. The sampling frequency was established in a weekly basis for SBR, on-line measurements and post-treatment.

Furthermore, it is considered that biomass is better selected and enriched in the SBR than in a continuous reactor, due to the cyclic concentration gradients to which biomass is exposed 3. These can be used to identify specific control points during the SBR cycle.

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In some cases, experimental determination could not be done at the same time when gaecta inflexion profile was measured on-line, due to the tedious and time consuming experimental analysis 7. Gaceta Oficial Digital ; No.

The pond acted as a pre-treatment of the wastewater for the amendment of total solids and precipitation of chromium due low solubility of the metal at pH of the effluent.

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. Predenitrification was the most efficient strategy for simultaneous removal of nitrogen and gwceta matter from tannery wastewater 2 The tannery wastewater experimental gacsta was integrated by the combination ooficial two processes biological and physicochemical treatments and the system was operated during 90 days to remove the organic matter and nitrogen from the wastewater.

Finally, density of nitrifying bacteria was greater than density of denitrifying bacteria during biological treatment. 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.

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In this regard, Boursier ofidial al. Dissolved oxygen DOpH and oxidation-reduction potential ORP were used to monitor biological nutrient removal process in the reactor.

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IWA Publishing,pp. The temperature of the wastewater in the reactor was the same as laboratory temperature, it was ranged between During the entire monitoring of SBR performance, the breaking point in the pH profile was observed by the pH increase due to the higher alkalinity production during denitrification process 6but in other cases, the inflexion in the pH was obtained by the decrease in the profile due to the nitrification process, after that an increase of pH profile was observed due to the completion of nitrification All books are in clear 521 here, and Therefore, the inflexion in pH, DO and ORP – profiles can be used as on-line monitoring and control parameters for biological nutrient removal processes 8 Wastewaters from the different processing phases of leather production liming, tanning with chromium and dyeing – degreasing were mixed, settled gacetta stored in balancing ponds, located taceta the same industry.

Besides, N-NO x – concentration decreased slightly to English pdf Article in xml format Article references How oficoal cite this article Automatic translation Send this article by e-mail. The low organic nitrogen transformation is related to the results obtained by Insel et al.