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Dissolved oxygen concentration was gradually increased from 0.
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This is an open-access article distributed under the terms of the Creative Commons Attribution License. Samples were taken hourly during the SBR cycle to determine the population density of nitrifying and denitrifying bacteria present in the reactor.
An integrated wastewater treatment was evaluated for nitrogen and COD removal from a tannery effluent. Please click button to get gaceta oficial oficixl now.
It is characterized by being rich in magnesium sulfate and potassium chloride, which are important agents during coagulation-flocculation process. How to cite this article. The final COD concentration consisted in 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.
Ammonium and nitrate broth Fluka Analytical were used for nitrifying and denitrifying bacteria, respectively, in accordance with Standard Methods For sowing, the most probable number technique MPN was utilized, using a selective medium for each group of bacteria.
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. The main phases in the Gwceta were anoxic filling, reaction phase anoxic – oxic – anoxicsettling and decanting, no external carbon source was added.
Average COD concentration at the end of the biological treatment was These results confirm that ORP is an appropriate indicator of nitrification progress in the system. Instead, it was used as an organic carbon source during ofiical phases, thus improving the denitrification process 2 The average physicochemical composition of tannery wastewater is shown in Table 1.
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The differences between oficisl times of appearance of inflexions and minimum concentration of contaminants are related to the sampling frequencies. Dissolved oxygen concentration was gradually increased from 0. The pre-treated wastewater was used as feed to the SBR. Therefore, the inflexion in pH, DO and ORP – gacera can be used as on-line monitoring and control parameters for biological nutrient removal processes 8 It was demonstrated that the limiting step to remove nitrogen during biological treatment was ammonification, but the remained organic nitrogen was removed oficual the ulterior physicochemical treatment.
With respect to the oxidized forms of ammonium, nitrites and nitrates N-NO x -a remaining concentration of Gaceta Oficial Digital, martes 16 de enero de Cycles evaluated in the SBR showed the efficiency of the oficiak system for nitrification, but showed its inefficiency to perform the ammonification of the organic nitrogen present in tannery wastewater.
Raw wastewater The industrial influent was collected from a tannery located in the city of Barquisimeto, Venezuela. Good correspondence was found between the end of nitrification and the inflexions in the pH and ORP profiles for all the cycles evaluated during the SBR performance.
The pre-treated wastewater was used as feed to the SBR. However, a recovery of the biological process was observed from day 41 of the treatment; although it was not until day 49 of the Foicial operation when the nitrogen removal efficiencies were stable again For this magazine there is no download available.
For sowing, the most probable number technique MPN was utilized, oifcial a selective medium for each group of bacteria. Finally, the number of positive tubes at each dilution was counted, and then gacta most probable numbers of nitrifying and denitrifying bacteria in the environment were determined using the table for three tubes This concentration decreased during the second anoxic phase until 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.
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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. During the investigation, a mix of reagents was used: In response to these increments, the system removal efficiencies decreased suddenly Figure 4.
Info Share ; Embed October 16, ; Accepted: 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.
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. Finally, density of nitrifying bacteria was greater than density of denitrifying bacteria during biological treatment.
Gaceta Oficial Digital ; No. Eight hours after the cycle began, nitrification removal efficiencies reached oficixl highest value ovicial The Jar-Test proceeded with the following steps and temporization: