Contamination reduction of real olive oil mill wastewater using innovative acid and basic chemical precipitation processes

Prazeres, Ana R.; Afonso, Alexandra; Guerreiro, Raquel C.S.; Jerónimo, Eliana

doi:10.1007/s13762-020-02924-5

Cited by 9 publications

(4 citation statements)

References 31 publications

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Section: Resultssupporting

confidence: 91%

“…The same exact pattern followed the AC in Figure 4B although with less variation in pH and PO 4 3--P concentrations over time due to the absence of M2. These results are comparable to those from Beltran et al (Beltrán-Rocha et al, 2021) who observed a non-biological P salt precipitation along with a pH increase in microalgal-bacterial consortia (Prazeres et al, 2021). PO 4 3--P is not a normalized parameter in the national legislation, so the values were compared to Switzerland's legal framework "Federal Water Protection Law (WPL)" which specifies the limit of PO 4 3--P in wastewater discharges at the level not exceeding 0.8 mg L −1 (Preisner et al, 2020).…”

Section: Phosphorus Removalsupporting

confidence: 91%

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Native microalgal-bacterial consortia from the Ecuadorian Amazon region: an alternative to domestic wastewater treatment

López-Patiño,

Cárdenas-Orrego,

Torres

et al. 2024

Front. Bioeng. Biotechnol.

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In low-middle income countries (LMIC), wastewater treatment using native microalgal-bacterial consortia has emerged as a cost-effective and technologically-accessible remediation strategy. This study evaluated the effectiveness of six microalgal-bacterial consortia (MBC) from the Ecuadorian Amazon in removing organic matter and nutrients from non-sterilized domestic wastewater (NSWW) and sterilized domestic wastewater (SWW) samples. Microalgal-bacterial consortia growth, in NSWW was, on average, six times higher than in SWW. Removal rates (RR) for NH4+- N and PO43−-P were also higher in NSWW, averaging 8.04 ± 1.07 and 6.27 ± 0.66 mg L−1 d−1, respectively. However, the RR for NO3− -N did not significantly differ between SWW and NSWW, and the RR for soluble COD slightly decreased under non-sterilized conditions (NSWW). Our results also show that NSWW and SWW samples were statistically different with respect to their nutrient concentration (NH4+-N and PO43−-P), organic matter content (total and soluble COD and BOD5), and physical-chemical parameters (pH, T, and EC). The enhanced growth performance of MBC in NSWW can be plausibly attributed to differences in nutrient and organic matter composition between NSWW and SWW. Additionally, a potential synergy between the autochthonous consortia present in NSWW and the native microalgal-bacterial consortia may contribute to this efficiency, contrasting with SWW where no active autochthonous consortia were observed. Finally, we also show that MBC from different localities exhibit clear differences in their ability to remove organic matter and nutrients from NSWW and SWW. Future research should focus on elucidating the taxonomic and functional profiles of microbial communities within the consortia, paving the way for a more comprehensive understanding of their potential applications in sustainable wastewater management.

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Section: Resultssupporting

confidence: 91%

Section: Phosphorus Removalsupporting

confidence: 91%

Native microalgal-bacterial consortia from the Ecuadorian Amazon region: an alternative to domestic wastewater treatment

López-Patiño,

Cárdenas-Orrego,

Torres

et al. 2024

Front. Bioeng. Biotechnol.

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“…Among the different processes described in the literature for AIWW treatment, immediate onestep lime precipitation (IOSLP) is presented as a simple and economic process that can be used to obtain, in a fast and efficient way, a clarified and disinfected effluent, rich in nutrients and with very low content in heavy metals, apparently capable of being reutilized for agricultural purposes [6]. Furthermore, IOSLP has been proven to be effectively reduce phenolic content when dealing with AIWWs with high phenolic content, such as OMW [7]. According to these authors, this process, consisting of adding lime to the wastewater, also contributes to the reduction in greenhouse gases through posterior spontaneous carbonation reactions with atmospheric CO 2 .…”

Section: Introductionmentioning

confidence: 99%

Reuse of Pretreated Agro-Industrial Wastewaters for Hydroponic Production of Lettuce

Afonso

Regato

Patanita

et al. 2023

Water

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The utilization of agro-industrial wastewaters (AIWWs), pretreated by immediate one-step lime precipitation + natural carbonation, as a nutritive solution for the hydroponic production of lettuce was evaluated. The AIWWs studied were olive mill wastewater (OMW), winery wastewater (WW), and cheese whey wastewater (CWW). Lettuces (Lactuca sativa L. var. crispa) were grown in a closed nutrient film technique hydroponic system, using the pretreated AIWWs (OMW-T, WW-T, and CWW-T) and a control nutrient solution (CNS). The growth and sensory analysis of lettuces and the environmental parameters of effluents after hydroponics were evaluated. The average number of lettuce leaves obtained with nutrient solutions prepared with AIWW-T was lower than that from CNS, but the highest lettuce chlorophyll content was attained with CWW-T, which also presented the best grow results. In general, sensory analysis did not show significant differences from the lettuces grown in the different pretreated AIWWs and CNS. As for the environmental parameters of the effluents from hydroponics, according to the Portuguese legislation, only the chemical oxygen demand of the OMW-T and WW-T presented slightly higher values than that of the environmental limit values for discharge in surface waters, showing the feasibility of using pretreated agro-industrial effluents in hydroponic lettuce cultivation, while obtaining a treated effluent, in a circular economy perspective.

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“…Phenolic compounds have several biological properties and are used in many industrial elds because of their antioxidant activity including the pharmaceutical, food, and cosmetic industries (Gueboudji et al 2021a, Soberón et al 2019). Some factors would in uence the phenolic compound's composition of OMW such as the olive varieties, climatic conditions, olive oil extraction process and ripening degree of the fruit (Prazeres et al 2021).…”

Section: Introductionmentioning

confidence: 99%

Maceration and liquid–liquid extractions of phenolic compounds and antioxidants from Algerian olive oil mill wastewater

Gueboudji

Kadi

Mahmoudi

et al. 2022

Environ Sci Pollut Res

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Olive oil mill wastewater (OMW) is a major waste stream from the olive oil industry. It is highly polluted due to phenolic compounds. The present study focused on the physicochemical properties of OMW as well as the quantitative and qualitative effects of two methods of extraction (maceration and liquid-liquid extraction) of phenolic compounds. MethodsLiquid-liquid extraction and maceration methods were used for the extraction of phenolics. Spectrophotometry and High-Performance Liquid Chromatography-Electrospray Ionization-Mass Spectrometry (HPLC-ESI-MS) were adopted to quantify the phytochemical contents and the phenolic compounds. The antioxidant potentials were evaluated using three assays DPPH, ABTS + and FRAP radical scavenging activities. ResultsThe ndings showed that the OMW was an acidic e uent (pH = 5.05) loaded with mineral and organic matter expressed in terms of a high value of electrical conductivity (EC = 13.51 mS/cm). Indeed, the OMW showed high dry matter, chemical oxygen demand (COD) and biological oxygen demand (BOD 5 ). The extract obtained by the maceration method showed the highest yields of total polyphenol, avonoid, and tannins contents than the liquid-liquid extraction method. The LC-MS results revealed the presence of 16 phenolic compounds in the extract obtained by the maceration method and only 12 phenolic compounds were found in the extract obtained by the second method. Quinic acid was identi ed as the most abundant compound. Moreover, the macerated extracts possessed the highest antioxidant potential as evidenced by their strong DPPH, ABTS and FRAP radical scavenging activities compared to the liquidliquid extracts. ConclusionsThe maceration methods seemed to be the most effective method for extracting phenolic compounds from OMW than liquid-liquid extraction. The OMW constitute a rich source of natural phenolic compounds that could be used as a potential source of natural antioxidants.

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Contamination reduction of real olive oil mill wastewater using innovative acid and basic chemical precipitation processes

Cited by 9 publications

References 31 publications

Native microalgal-bacterial consortia from the Ecuadorian Amazon region: an alternative to domestic wastewater treatment

Native microalgal-bacterial consortia from the Ecuadorian Amazon region: an alternative to domestic wastewater treatment

Reuse of Pretreated Agro-Industrial Wastewaters for Hydroponic Production of Lettuce

Maceration and liquid–liquid extractions of phenolic compounds and antioxidants from Algerian olive oil mill wastewater

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