Effect of combined physico-chemical processes on the phytotoxicity of olive mill wastewaters

Andreozzi, Roberto; Canterino, Marisa; Somma, Ilaria Di; Giudice, Roberto Lo; Marotta, Raffaele; Pinto, Gabriele; Pollio, Antonino

doi:10.1016/j.watres.2007.10.018

Cited by 53 publications

(27 citation statements)

References 23 publications

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“…In the same direction of the previous study, Mekki et al (2008) also verified the high toxicity of raw OMW (COD = 58.5 g l -1 ; phenolic content = 9.1 g l -1 ) which has completely inhibited the luminescence of V. fischeri being such inhibitory effect still high (96%) even after a great dilution (24 times) of the OMW. Andreozzi et al (2008) have chosen the green freshwater algae Pseudokirchneriella subcapitata to assess the toxicity of a centrifuged OMW, verifying that even after a dilution of 1:640 (v/v), an inhibition of about 50% in growth occurred. All the studies reported are enable to relate the data gathered with their ecological consequences, although direct and serious indirect effects would be expected, as those provoked by a depression of the phytoplankton community in the freshwater ecosystems.…”

Section: Physico-chemical Composition and Valorisation Of Olive Oil Mmentioning

confidence: 99%

“…The phytotoxic effects of OMW seemed to be less contradictory since several authors have shown that the high loads of phenolic compounds both in raw and diluted OMWs may cause toxic effects at different growth stages and on seed germination of several crops, such as maize, radish, cucumber, lettuce, wheat, chickpea, tomato durum wheat, and English cress (Casa et al 2003;El Hadrami et al 2004;Ben Sassi et al 2006;Andreozzi et al 2008). The phytotoxicity of OMW effluent is high even after a dilution of 1:8 (v/v) which can cause an inhibition of 55, 60 and 98% in the germination index of radish, cucumber and lettuce species (Andreozzi et al 2008).…”

Section: Physico-chemical Composition and Valorisation Of Olive Oil Mmentioning

confidence: 99%

“…The phytotoxicity of OMW effluent is high even after a dilution of 1:8 (v/v) which can cause an inhibition of 55, 60 and 98% in the germination index of radish, cucumber and lettuce species (Andreozzi et al 2008). This conclusion is further enhanced by the fact that seed germination in crop species has been pointed out as the less sensitive parameter to different types of soil contamination, due to the protection given to the embryos by the seed coat.…”

Section: Physico-chemical Composition and Valorisation Of Olive Oil Mmentioning

confidence: 99%

“…Several studies (Sayadi et al 2000;Casa et al 2003;Fiorentino et al 2003;Isidori et al 2005;Celano et al 2008;Mekki et al 2008;Kallel et al 2009) emphasized the roles of phenolic and polyphenolic compounds (molecular mass up to 60 kDa) in the toxicity of OMWs towards microorganisms and plants. However, and despite the degradation of most of these compounds (Kallel et al 2009), with some of the treatment methodologies proposed, there are few studies (e.g., Aggelis et al 2003;Andreozzi et al 2008;Justino et al 2009) reporting the application of ecotoxicological tests on OMW before and after such treatments to obtain a real evaluation of its effectiveness in terms of toxicity reduction. Then, the objective of this review is to compile and make a critical review of the relevant information to demonstrate that a treatment methodology can not be chosen based only on its efficiency to remove COD and colour, and that is important to focus our attention in this research topic, which represents a great environmental problem for several Mediterranean countries.…”

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confidence: 99%

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Olive oil mill wastewaters before and after treatment: a critical review from the ecotoxicological point of view

et al. 2011

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The olive oil mill wastewater (OMW) is a problematic and polluting effluent which may degrade the soil and water quality, with critical negative impacts on ecosystems functions and services provided. The main purpose of this review paper is presenting the state of the art of OMW treatments focusing on their efficiency to reduce OMW toxicity, and emphasizing the role of ecotoxicological tests on the evaluation of such efficiency before the up-scale of treatment methodologies being considered. In the majority of research works, the reduction of OMW toxicity is related to the degradation of phenolic compounds (considered as the main responsible for the toxic effects of OMW on seed germination, on bacteria, and on different species of soil and aquatic invertebrates) or the decrease of chemical oxygen demand content, which is not scientifically sound. Batteries of ecotoxicological tests are not applied before and after OMW treatments as they should be, thus leading to knowledge gaps in terms of accurate and real assessment of OMW toxicity. Although the toxicity of OMW is usually high, the evaluation of effects on sub-lethal endpoints, on individual and multispecies test systems, are currently lacking, and the real impacts yielded by its dilution, in freshwater trophic chains of receiving systems can not be assessed. As far as the terrestrial compartment is considered, ecotoxicological data available include tests only with plants and the evaluation of soil microbial parameters, reflecting concerns with the impacts on crops when using OMW for irrigation purposes. The evaluation of its ecotoxicity to other edaphic species were not performed giving rise to a completely lack of knowledge about the consequences of such practice on other soil functions. OMW production is a great environmental problem in Mediterranean countries; hence, engineers, chemists and ecotoxicologists should face this problem together to find an ecologically friend solution.

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Section: Physico-chemical Composition and Valorisation Of Olive Oil Mmentioning

confidence: 99%

Section: Physico-chemical Composition and Valorisation Of Olive Oil Mmentioning

confidence: 99%

Section: Physico-chemical Composition and Valorisation Of Olive Oil Mmentioning

confidence: 99%

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confidence: 99%

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Olive oil mill wastewaters before and after treatment: a critical review from the ecotoxicological point of view

et al. 2011

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“…In any case and irrespective of the method used, all the units generate waste and effluents which are harmful to the environment (Sassi et al [1], Andreozzi et al [2], Morillo et al [3]) and full research has been done about this issue (Gómez et al [4], Russo et al [5], Roig et al [6]). …”

Section: Introductionmentioning

confidence: 99%

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Claro¹,

Gonzalez²

2011

WIT Transactions on Ecology and the Environment

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Based on a patented process for the treatment and reprocessing of waste and effluents from olive oil and cork industries (such as two-phase olive husks cork powder), new research has been carried out incorporating other industrial wastes.In previous research, using only olive oil and cork wastes, we obtained biomass pellets with high calorific values (20.6 MJ/kg and 22.2 MJ/kg), low moisture (8.9%) and relatively low ashes percentage (3.9%). Several new formulations and its relevance in the calorific value were now tested using other wastes or by-products. We have analysed the potential inclusion of olive leaves from the olive oil industry, grape husks and grape seeds from the winery industry and chestnut shells (outer shell and inner skin) from the chestnut industry. This process will contribute to solving environmental problems resulting from the discharge of those wastes and effluents and to create a viable and profitable alternative to their storage and/or a deposition in landfill. The increase of others biomass sources on these types of process is extremely important as an environmental and economic management point of view.This research shows that the use of different types of raw materials as biomass sources (giving different pellets formulations) results in a different final product with different physical and chemical characteristics that may improve its quality.

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From a lab test to industrial application: scale‐up of Fenton process for real olive mill wastewater treatment

Amaral‐Silva

Martins

Nunes

et al. 2016

J of Chemical Tech & Biotech

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BACKGROUND This study evaluates the integration of ferric coagulation, Fenton oxidation (both at lab and industrial scale) and activated sludge (at lab scale) for the treatment of olive mill wastewater. RESULTS Initially, an iron based coagulation at the raw pH of olive mill effluent was performed, leading to 38% COD abatement at bench scale. This procedure also provided some dissolved iron that can be used as catalyst in the following Fenton's peroxidation step. At lab scale Fenton's process accomplished COD removal of 75%. Moreover, some biodegradability enhancement was achieved with this procedure with initial BOD5/CODaverage = 0.03 increasing to BOD5/CODaverage = 0.37 after the process. This integrated treatment was then applied at industrial scale and, after further optimization, coagulation and Fenton's processes were able to remove 43% and 62% of COD, respectively. CONCLUSION Based on the interesting results gathered at lab‐scale, it was possible to optimize an industrial WWTP (waste water treatment plant). Ferric coagulation followed by Fenton's peroxidation was implemented with efficiency up to 90% and final COD of 200 mgO2 L−1. The resulting wastewater can be discharged into municipal sewage or can be recycled for reutilization after an in situ biological treatment. © 2016 Society of Chemical Industry

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Effect of combined physico-chemical processes on the phytotoxicity of olive mill wastewaters

Cited by 53 publications

References 23 publications

Olive oil mill wastewaters before and after treatment: a critical review from the ecotoxicological point of view

Olive oil mill wastewaters before and after treatment: a critical review from the ecotoxicological point of view

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From a lab test to industrial application: scale‐up of Fenton process for real olive mill wastewater treatment

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