Progressive pollution abatement in raw dairy wastewater induced by the algae Poterioochromonas malhamensis with a high-value biomass yield
BIOCHEMICAL ENGINEERING JOURNAL(2024)
摘要
This work aimed to systematically abate in batch mode organic pollutants from raw dairy wastewater (DW) with high values of chemical oxygen demand (COD,-10.3 g L-1), total organic carbon (TOC,-2.4 g L-1), and total nitrogen (TN,-0.28 g L-1) by using the Poterioochromonas malhamensis algae strains. In this regard, variables such as fractions of DW (40-100%, v/v), mineral nutritional inoculum addition (0-100%, w/v) and CO2- enriched air (2-8%) were proposed to address a study in optimizing conditions with new insights on algae production. As controlled photobioreactors (PBR), a set of tubular PBRs and a pair of flat-plate PBRs (FP-PBR) surrounded by fluorescent lamps and pumped by CO2-enriched air at a flow rate of 1.4 L min- 1 per litre were used. A Box-Behnken design (BBD) for algal growing was applied using the set of tubular PBRs to get a better reduction in TOC, TN and COD, defining an optimized condition. On the best tubular PBRs-based outcome and including a holed baffles system for hydrodynamically providing a flashing light state, 9-day kinetic experiments based on a pair of FP-PBRs were performed to provide more insights on how to enhance the algal yield and COD, TN and TOC reduction. A biomass yield rate of 1.1 g L-1 per day was attained using FP-PBRs, being comparatively 10% better than tubular PBRs. Additionally, the organic pollution abatement in DW was highly significant, with a decrease of about 98%, 95%, and 92% in COD, TN and TOC, respectively, besides changing the initial bacteria diversity to another less harmful one.
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关键词
Poterioochromonas malhamensis,Dairy industry wastewater,Tubular and flat -plate photobioreactors,High pollutant removal,High algal growth,Bacterial diversity changes
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