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Tertiary treatment (Chlorella sp.) of a mixed effluent from two secondary treatments (immobilized recombinant P. pastori and rPOXA 1B concentrate) of coloured laboratory wastewater (CLWW)

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Abstract

Industrial development has increased wastewater (WW) volume; generating contamination and disturbing ecosystems, because of breeching disposal parameters. In this work, Coloured Laboratory Wastewater (CLWW), (1500.00 colour units, CU) was separately submitted to two secondary treatments. For the first one CLWW was treated for three cycles C1, C2 and C3 with P. pastoris X33/pGAPZαA-LaccPost-Stop producing rPOXA 1B laccase, immobilized in calcium alginate beads. For the second-one, rPOXA 1B enzyme concentrate was used (three processes: P1, P2, and P3). Both treatments were carried out in a 15 L reactor with 10 L effective work volume (EWV) with 72 h hydraulic retention time. C1, C2, and C3 effluents were flocculated and filtered through quartzite sand, while P1, P2, and P3 effluents were only filtered through quartzite sand. The mixture of secondary effluents was submitted to a tertiary treatment with Chlorella sp. For C1, C2, C3, P1, P2, and P3, CU removal was of 99.16, 99.58, 99.53, 96.72, 97.05 and 96.47%, respectively. Discharge parameters, total organic carbon (TOC), inorganic carbon (IC), chemical oxygen demand (COD) and biological oxygen demand (BOD5) decreased, although they reached different final values. After the tertiary treatment (144 h) effluent discharge parameters were reduced to 34 ± 4 CU, TOC to 6.6 ± 0.9 mg L−1 and COD to 155 ± 4 mg L−1. It was demonstrated that secondary treatments (immobilized recombined cells or recombinant enzyme concentrate) combined with Chlorella sp., (tertiary treatment) attained a considerable removal of discharge parameters, demonstrating a promissory alternative for CLWW sequential treatment.

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Abbreviations

WW:

Wastewater

CLWW:

Coloured Laboratory Wastewater

CU:

Colour units

C1:

Cycle 1

C2:

Cycle 2

C3:

Cycle 3

P1:

Process 1

P2:

Process 2

P3:

Process 3

EWV:

Effective work volume

TOC:

Total organic carbon

IC:

Inorganic carbon

COD:

Chemical oxygen demand

BOD5 :

Biological oxygen demand

POXA 1B:

Laccase from P. ostreatus

rPOXA 1B:

Recombinant laccase from P. ostreatus

TSS:

Total suspended solids

TN:

Total nitrogen

CFU:

Colony forming units

OM:

Organic matter

Y:

Yield

ABTS:

2, 2-Azino-bis(3-ethylbenzothiazoline-6-sulfonic acid)

SEM:

Scaning electron microscopy

EDS:

Energy dispersive X-ray spectroscopy

TDN:

Total dissolved nitrogen

MP:

Micropollutants

AOP:

Advanced oxidation processes

TVA:

Titania supported over volcanic ashes

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Acknowledgements

This research was funded by Grant No: 00007885 (Estudio de la estabilidad a tiempo real del concentrado de la lacasa rPOXA 1B de Pleurotus ostreatus producida en Pichia pastoris) and Grant ID: 00007135 (Diseño, implementación y evaluación a escala de laboratorio de un sistema secuencial para la remoción de color y carga orgánica presente en los subproductos líquidos derivados de las tinciones de microbiología, con fines de re uso en zonas verdes.) from Pontificia Universidad Javeriana. Financing entity had no role in the study design, data collection, or analysis, decision to publish, or preparation of the manuscript. Authors thank to María Lucía Gutiérrez, Ph.D., for English editing.

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Authors and Affiliations

Authors

Contributions

Conceived and designed the analyses: CMR-H, RAP-P, AMP-R, AP-F, BEQ-H. Acquired funding: AMP-R, RAP-P. Collected the data and performed the analyses: LDA-L, VH-R, DNC-B, JFM-M, LDP-C. Administrated resources for the project: AMP-R, RAP-P. Wrote the paper: LDA-L, AMP-R, RAP-P. Performed critical review of the manuscript with editions: AMP-R, CMR-H, RAP-P, AP-F, BEQ-H.

Corresponding authors

Correspondence to Raúl A. Poutou-Piñales or Aura M. Pedroza-Rodríguez.

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The authors declare they have no competing interests.

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Ardila-Leal, L.D., Hernández-Rojas, V., Céspedes-Bernal, D.N. et al. Tertiary treatment (Chlorella sp.) of a mixed effluent from two secondary treatments (immobilized recombinant P. pastori and rPOXA 1B concentrate) of coloured laboratory wastewater (CLWW). 3 Biotech 10, 233 (2020). https://doi.org/10.1007/s13205-020-02232-2

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  • DOI: https://doi.org/10.1007/s13205-020-02232-2

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