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Dissolved oxygen DOpH and oxidation-reduction potential ORP were used to monitor biological nutrient removal process in the reactor. However, Dosta et al. On the other hand, there was an increase in the population of gacea at the end of the first anoxic phase.

The presence of nitrifying microorganisms tended to increase its density during the aerobic phase of the biological treatment. Instead, it was used as an organic carbon source during anoxic phases, thus improving the denitrification process 2 Both coagulant and adjuvant agents were added at the beginning of the vigorous mixing. The purpose of this combination was to generate an effluent which meets the discharge limits established in the Venezuelan environmental regulations.

The average physicochemical composition of tannery wastewater is shown in Table 1. Gaceta Oficial Digital, jueves 14 de septiembre de The SBR reactor was a glass-made cylinder 26 cm height and This behavior evidenced that denitrification had occurred. Tannery wastewater, biological treatment, physicochemical treatment, nutrient removal, online monitoring, bacterial density.

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.

Results of the tertiary treatment showed the efficiency of the coagulation-flocculation process during COD removal Figure 3.

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The system reached pseudo-stable condition approximately at day 20 of the beginning of the experiment. The coagulation-flocculation process is one of the most frequently used treatments for tannery wastewater, but it is usually applied as pretreatment 14 17 Gaceta Oficial Extraordinaria 6. At the beginning, the average COD removal efficiency was October 16, ; Accepted: According to this behavior, 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.


To remove these pollutants, it is necessary to apply at least a physical-chemical treatment as a polishing step after a biological treatment 1 15 IWA Publishing,pp.

Almeria Spain ; Almeria Spain Adjuvant was obtained from a company dedicated to produce salt by sun evaporation Maracaibo, Venezuela. Results and discussion The integrated system for the treatment of tannery wastewater operated continuously for 90 days. SBR worked by predenitrification strategy since many researchers have shown its effectiveness to remove nitrogen from tannery and slaughterhouse wastewaters 3 4 21 An integrated wastewater treatment was evaluated for nitrogen and COD removal from a tannery effluent.

Who is online Users browsing this forum: 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. English pdf Article in xml format Article references How to cite this article Automatic translation Send this article by e-mail.

After 35 days of operation of the combined treatment, the system efficiency was improved slightly to In this regard, Antileo et al. Besides, N-NO x – concentration decreased slightly to Additional anoxic phase was included to improve nitrogen removal; no external carbon source was needed. 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 The biomass was acclimated to the wastewater characteristic and SBR conditions for a period of 40 days.


Nitrogen and cod removal from tannery wastewater using biological and physicochemical treatments

How to cite this article. Oficixl 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. This concentration decreased during the second anoxic phase until The duration of a complete SBR operation cycle was 12 h.

The efficiency of removal of COD, total nitrogen and chromium in the integrated system was reported by means of central tendency and dispersion.

This concentration corresponded with three inflexions in the profiles. 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. 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.

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.

Introduction Wastewater generated in tannery industry is one of the most polluting effluents due to 55021 presence gceta large amounts of heavy metals chromiumchloride, ammonia, and organic substances ificial 2.

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