Optimal conditions for olive mill wastewater treatment using ultrasound and advanced oxidation processes

Bsoul, Abeer Al; Al-Shannag, Mohammad; Tawalbeh, Muhammad; Al-Taani, Ahmed A.; Lafi, Walid K.; Al‐Othman, Amani; Alsheyab, Mohammad

doi:10.1016/j.scitotenv.2019.134576

Cited by 103 publications

(32 citation statements)

References 54 publications

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“…The US helps in increasing soluble organics present in TPOME, which are more amenable to photocatalytic oxidation [ 55 ]. Thus, the efficiency of photocatalysis coupled with US is higher compared to other processes investigated in the present study, and is in good agreement with previous studies on the sonophotocatalytic treatment of olive oil mill wastewater, which has similar characteristics to TPOME [ 56 ]. The results suggest that visible light-mediated photocatalysis based on CBN-TiO 2 coupled with US cavitation is a promising approach for TPOME’s remediation.…”

Section: Resultssupporting

confidence: 92%

“…The US may have helped increase the light scattering effect, and consequently suppressed the passage of light through the TPOME suspension. These results are consistent with those obtained by [ 56 ], where the maximum COD removal (~30%) from olive oil mill wastewater, which has similar characteristics to TPOME, was obtained at an optimal TiO 2 loading of 0.75 g/L. It is important to note that the final COD concentration after treatment was ~260 mg/L, which is still above the maximum permissible limit (50 mg/L) for COD in TPOME.…”

Section: Resultssupporting

confidence: 91%

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Synthesis and Characterization of Carbon and Carbon-Nitrogen Doped Black TiO2 Nanomaterials and Their Application in Sonophotocatalytic Remediation of Treated Agro-Industrial Wastewater

et al. 2021

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The conventional open ponding system employed for palm oil mill agro-effluent (POME) treatment fails to lower the levels of organic pollutants to the mandatory standard discharge limits. In this work, carbon doped black TiO2 (CB-TiO2) and carbon-nitrogen co-doped black TiO2 (CNB-TiO2) were synthesized via glycerol assisted sol-gel techniques and employed for the remediation of treated palm oil mill effluent (TPOME). Both the samples were anatase phase, with a crystallite size of 11.09–22.18 nm, lower bandgap of 2.06–2.63 eV, superior visible light absorption ability, and a high surface area of 239.99–347.26 m2/g. The performance of CNB-TiO2 was higher (51.48%) compared to only (45.72%) CB-TiO2. Thus, the CNB-TiO2 is employed in sonophotocatalytic reactions. Sonophotocatalytic process based on CNB-TiO2, assisted by hydrogen peroxide (H2O2), and operated at an ultrasonication (US) frequency of 30 kHz and 40 W power under visible light irradiation proved to be the most efficient for chemical oxygen demand (COD) removal. More than 90% of COD was removed within 60 min of sonophotocatalytic reaction, producing the effluent with the COD concentration well below the stipulated permissible limit of 50 mg/L. The electrical energy required per order of magnitude was estimated to be only 177.59 kWh/m3, indicating extreme viability of the proposed process for the remediation of TPOME.

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Section: Resultssupporting

confidence: 92%

Section: Resultssupporting

confidence: 91%

Synthesis and Characterization of Carbon and Carbon-Nitrogen Doped Black TiO2 Nanomaterials and Their Application in Sonophotocatalytic Remediation of Treated Agro-Industrial Wastewater

et al. 2021

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“…US waves with enough pressure amplitude generate cavitation bubbles (Shah et al 2012) that collapse resulting in extreme localized temperature and pressure in solution (up to 5000°C and 500 atm) (Ohrdes et al 2018) and free radical formation, able to attack the biological contaminants (Pokhrel et al 2016). Low-frequency ultrasounds are particularly indicated in wastewater treatment, positively affecting US activity (Al-Bsoul et al 2020) and producing larger cavitation bubbles that result in higher energy release (Al-Bsoul et al 2010;Young 1989).…”

Section: Introductionmentioning

confidence: 99%

Combined ultrasound-ozone treatment for reutilization of primary effluent—a preliminary study

Rossi

Mainardis

Aneggi

et al. 2020

Environ Sci Pollut Res

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The present work is a preliminary study on the potential of low-frequency ultrasound irradiation coupled with O 3 process for the disinfection of a primary effluent from a municipal wastewater treatment plant preserving nutrient levels (in particular nitrogen and phosphorous), for its possible reuse in civil, industrial, and agricultural sectors. The treated water could be reused, after appropriate dilution, contributing to the circular economy perspective and reducing the need for both chemical fertilizer addition and freshwater supply. The effect of different specific ultrasonic energies and ozone doses was assessed on a bench-top system, composed of an ultrasonic reactor and a semi-batch ozonation vessel. The results showed that the combined US-O 3 process produces a good removal efficiency regarding soluble Chemical Oxygen Demand, sCOD (ca. 60%), anionic surfactants (ca. 50%), and formaldehyde (ca. 50%), and an optimal abatement for Methylene Blue Active Substances (MBAS, > 90%). The process also reached high disinfection performances, obtaining 4 logs for E. coli and 5 log abatement for Total Coliforms. The high removal efficiency is matched by an outstanding retention of nutrients (total nitrogen and orthophosphate) highlighting a high potential value for agricultural reuse of the treated primary effluent, with possible significant saving of chemical fertilizers. It was concluded that low-frequency ultrasound pretreatment, combined with ozonation, could be a useful process for primary effluent recovery for several purposes. Further studies are expected to be planned and executed to evaluate system scale-up feasibility.

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“…These and other pretreatments on cellulosic sludge are being effectively used to extract sugars from the biomass. Several processes nowadays that can be used for the treatment of pulp and paper industry wastewater such as biological processes, adsorption, advanced oxidation, chemical coagulation, electrocoagulation, and membrane separation 31‐34 …”

Section: Introductionmentioning

confidence: 99%

“…Several processes nowadays that can be used for the treatment of pulp and paper industry wastewater such as biological processes, adsorption, advanced oxidation, chemical coagulation, electrocoagulation, and membrane separation. [31][32][33][34] Cellulose content is the only consideration for the evaluation of a biomass source. This is because the extraction of sugars must practically take place under milder conditions than strong-acid hydrolysis at high temperature.…”

mentioning

confidence: 99%

Techno‐economic analysis and a novel assessment technique of paper mill sludge conversion to bioethanol toward sustainable energy production

et al. 2020

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A novel bioprocess design to convert paper mill sludge (PMS) to biofuels is proposed in this work. The design utilizes cellulosic fiber recovered from the PMS via optimized de-ashing (HCl washing) step. This work specifically provided a technical and economic analysis of paper mill sludge conversion into biofuel production using a novel protocol. The protocol is based on scanning electron microscopy (SEM) analysis to assess the quality of the contained cellulose prior to further processing. The results are crucially important to determine the suitability of the PMS feedstock to produce biofuels. SEM analysis was employed as a preliminary screening tool to evaluate sludge digestibility and conversion. The SEM characterization technique established a direct relationship between the fiber morphology, presence of crystals salts and sugar yield after enzymatic hydrolysis. Substantial structural changes were observed before and after de-ashing the sludge samples, leading to a correlation between the surface morphology and the washing step. The results suggested that deashing changes the surface morphology and upon analysis, increased the sugar yield up to about 86% as opposed to 2.2% in sludge sample A as an example. The PMS conversion into biofuel was simulated using Aspen PLUS and compared to a similar process using corn stover as feedstock. The simulation results showed it is 20% cheaper to produce bioethanol from PMS compared to corn stover. The simulation revealed less energy demand by around 13 320 MJ/h compared to that when corn stover was used.

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Optimal conditions for olive mill wastewater treatment using ultrasound and advanced oxidation processes

Cited by 103 publications

References 54 publications

Synthesis and Characterization of Carbon and Carbon-Nitrogen Doped Black TiO2 Nanomaterials and Their Application in Sonophotocatalytic Remediation of Treated Agro-Industrial Wastewater

Synthesis and Characterization of Carbon and Carbon-Nitrogen Doped Black TiO2 Nanomaterials and Their Application in Sonophotocatalytic Remediation of Treated Agro-Industrial Wastewater

Combined ultrasound-ozone treatment for reutilization of primary effluent—a preliminary study

Techno‐economic analysis and a novel assessment technique of paper mill sludge conversion to bioethanol toward sustainable energy production

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