A systematic optimization of piggery wastewater treatment with purple phototrophic bacteria

Cristian A Sepúlveda-Muñoz; Ignacio de Godos; Daniel Puyol; Raúl Muñoz

doi:10.1016/j.chemosphere.2020.126621

A systematic optimization of piggery wastewater treatment with purple phototrophic bacteria

Chemosphere. 2020 Aug:253:126621. doi: 10.1016/j.chemosphere.2020.126621. Epub 2020 Mar 29.

Authors

Cristian A Sepúlveda-Muñoz¹, Ignacio de Godos², Daniel Puyol³, Raúl Muñoz⁴

Affiliations

¹ Department of Chemical Engineering and Environmental Technology, School of Industrial Engineering, University of Valladolid, Dr. Mergelina, s/n, 47011 Valladolid, Spain; Institute of Sustainable Processes, Dr. Mergelina, s/n, 47011 Valladolid, Spain.
² Institute of Sustainable Processes, Dr. Mergelina, s/n, 47011 Valladolid, Spain; School of Forestry, Agronomic and Bioenergy Industry Engineering (EIFAB), University of Valladolid, Campus Duques de Soria, 42004, Soria, Spain.
³ Department of Chemical and Environmental Technology, ESCET, King Juan Carlos University, 28933, Móstoles, Madrid, Spain.
⁴ Department of Chemical Engineering and Environmental Technology, School of Industrial Engineering, University of Valladolid, Dr. Mergelina, s/n, 47011 Valladolid, Spain; Institute of Sustainable Processes, Dr. Mergelina, s/n, 47011 Valladolid, Spain. Electronic address: mutora@iq.uva.es.

PMID: 32278906
DOI: 10.1016/j.chemosphere.2020.126621

Abstract

The increase in natural water bodies pollution caused by intensive animal farming requires the development of innovative sustainable treatment processes. This study assessed the influence of piggery wastewater (PWW) load, air dosing, CO₂/NaHCO₃^- supplementation and pH control on PWW treatment by mixed cultures of purple phototrophic bacteria (PPB) under infrared radiation in batch photobioreactors. PPB was not able to grow in raw PWW but PWW dilution prevented inhibition and supported an effective light penetration. Despite the fact that PPB were tolerant to O₂, carbon recovery decreased in the presence of air (induced by stripping). CO₂ supplementation was identified as an effective strategy to maximize the removal of carbon during PPB-based PWW treatment with removal efficiencies of 72% and 74% for TOC and VFAs. However, the benefits derived from CO₂ addition were induced by the indirect pH control exerted in the cultivation medium. Thus, PPB supported an optimal pollutant removal performance at pH 7, with removal efficiencies of 75%, 39% and 98% for TOC, TN and VFAs.

Keywords: Nutrient recovery; PPB; Photosynthetic bacteria; Purple non-sulphur bacteria; Swine manure.

MeSH terms

Animals
Bacteria
Carbon
Color
Nitrogen
Photobioreactors / microbiology
Waste Disposal, Fluid / methods*
Wastewater / microbiology

Substances

Waste Water
Carbon
Nitrogen