TRANSIENT PERFORMANCE OF TWO-ELECTRON REGIME BIOREACTORS THAT CONTAINED UNACCLIMATED BIOCATALYSTS AFTER FEEDING PERCHLOROETHYLENE

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Cuauhtemoc Ulises Moreno-Medina
Héctor Mario Poggi-Varaldo
Luz Breton-Deval
Noemi Rinderknecht-Seijas

Resumen

The objective of this work was to assess the impact of perchloroethylene (PCE) and coupled zero valent iron (ZVI) filters on the transient performance of fluidized bed bioreactors (FBBRs) operated in simultaneous electron acceptors modes. Four lab scale, FBBRs were implemented. Two FBBRs were operated as simultaneous methanogenic-denitrifying (MD) units, whereas the other two were operated in partially-aerated methanogenic (PAM) mode. In the first period all FBBRs received a synthetic wastewater with 1 g COD-methanol/L. In a second period, all the FBBRs received the synthetic wastewater plus 80 mg PCE/L. At the start of period 2, one MD and one PAM FBBRs were coupled to side sand-ZVI filters. All bioreactors anchored microbial consortia unacclimated to PCE. In this work, bioreactor performance in the full period 1 and the first 15 days of period 2 (transient state) is reported and discussed. The chemical oxygen demand and the nitrate removal efficiency of the FBBRs did not decrease between period 1 and period 2, i.e., upon PCE addition, particularly for MD bioreactors. On the contrary, specific oxygen uptake rate of all FBBRs in period 2 decreased by ca. 80 to 96 % or more compared to period 1. In period 2, PCE removals and dehalogenation efficiency were in the range of 81 to 94 % and 73 to 90 %, respectively. The highest values corresponded to PAM bioreactors, particularly for that equipped with ZVI filter. Slight positive effects of ZVI filter on PCE removal and the dehalogenation efficiencies were observed in the PAM ZVI bioreactor configuration. It is concluded that the simultaneous electron acceptor type (PAM vs. MD) had a significant effect on the bioreactor performance, whereas the coupling to ZVI filters only had a slight positive effect on the bioreactor performance in the PAM-ZVI bioreactor.

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Biografía del autor/a

Cuauhtemoc Ulises Moreno-Medina, CINVESTAV-IPN, Depto. Biotecnología

Profesor Investigador SNI 2 • Ruiz-Aguilar G.M.L., Fernández-Sánchez J.M., Rodríguez-Vázquez R., Poggi-Varaldo H.M. (2002). Degradation by white-rot fungi of high concentrations of PCB extracted from a contaminated soil. Advances in Environmental Research, 6(4), pp. 559-568. • Estrada-Vázquez C., Macarie H., Kato M.T., Rodríguez Vázquez R., Esparza-García F., Poggi-Varaldo H.M. (2002). The effect of the supplementation with primary carbon source on the resistance to oxygen exposure of methanogenic sludge. VII Taller y Simposio Latinoamericano sobre Digestión Anaerobia, Mérida, Yucatán, 22-25 /10/2002, pp. 197-202. • Macarie H., Ahring B.K., Rinderknecht-Seijas N., Poggi Varaldo H.M. (2002). A review on bioreactors with simultaneous electron acceptors for removal of reacalcitrant and toxic compounds. 5th IWA Chemical Industry Group Conference. O. Thomas, J.R. Degorce-Dumas, B. Roig (Eds.). Nimes, Francia, 13-14/11/02, pp. 149-156. • Poggi-Varaldo H.M., Ahring B.K., Rinderknecht-Seijas N. (2002). Practical equations for simultaneous methanogenic-denitrification treatment, 7th. IWA Workshop-Symposium on Anaerobic Digestion in Latin America. G. Buitrón, N. Cabirol, K. Ilangovan, O. Monroy, A. Noyola, H.M. Poggi-Varaldo (Eds.). Mérida, Yuc., México, 22-25/10/02, pp. 89-92. • Poggi-Varaldo H.M., Caffarel-Méndez S., Rinderknecht-Seijas N. (2002). The availability enhancement factor allows to quantify the effectiveness of different soil treatments for improving the pollutant availability. 5th IWA Chemical Industry Group Conference. O. Thomas, J.R. Degorce-Dumas, B. Roig (Eds.). Nimes, Francia, 13-14/11/02, pp. 451-458.

Héctor Mario Poggi-Varaldo, Departamento de Biotecnología y Bioingeniería del Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional. Av. Instituto Politécnico Nacional 2508, Col. San Pedro Zacatenco, Delegación Gustavo A. Madero, México D.F. Código Postal 07360. Apartado Postal: 14-740, 07000 México, D.F.

Dr. en C., Profesor Investigador, Depto. de Biotecnología y Bioingeniería, Grupo de Biotecnología Ambiental y de Energías Renovables, CINVESTAV del IPN.

Luz Breton-Deval, Departamento de Biotecnología y Bioingeniería del Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional. Av. Instituto Politécnico Nacional 2508, Col. San Pedro Zacatenco, Delegación Gustavo A. Madero, México D.F. Código Postal 07360. Apartado Postal: 14-740, 07000 México, D.F.

Doctora egresada del Departamento de Biotecnología y Bioingeniería del Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional.

Noemi Rinderknecht-Seijas, Escuela Superior de Ingeniería Química y Extractivas del Instituto Politécnico Nacional, Mexico. Edificio N° 7, Unidad Profesional Adolfo López Mateos. Colonia Lindavista, Delegación Gustavo A. Madero, Ciudad de México, México, C.P. 07738. Conmutador 57296000 Ext. 46140

Profesora de la Escuela Superior de Ingeniería Química y Extractivas del  Instituto Politécnico Nacional

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