Optimization of electrocoagulation process and combination of anaerobic digestion for the treatment of pistachio processing wastewater

Özay, Yasin; Ünşar, E. Kökdemir; Işık, Zelal; Yılmaz, Fatih; Dizge, Nadir; Perendeci, Nuriye Altınay; Mazmancı, Mehmet Ali; Yalvaç, Mutlu

doi:10.1016/j.jclepro.2018.05.242

Cited by 35 publications

(14 citation statements)

References 31 publications

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“…The quality of models was concluded via the coefficient of determination (R 2 ) and an adjusted determination coefficient (adj-R 2 ). With the help of the obtained model equations, optimizations of chemical-assisted thermal pretreatment processes were performed by using maximization and minimization criteria for independent and dependent variables [3,30]. The goal settings of the variables have been adjusted by using the plus (+) symbols in the module of optimization of a Design-Expert ® software program for process optimization.…”

Section: Naoh-assisted Thermal Pretreatmentmentioning

confidence: 99%

Impacts of Chemical-Assisted Thermal Pretreatments on Methane Production from Fruit and Vegetable Harvesting Wastes: Process Optimization

Günerhan¹,

Us²,

Dumlu

et al. 2020

Molecules

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The increasing population creates excess pressure on the plantation and production of fruits and vegetables across the world. Consumption demand during the whole year has made production compulsory in the covered production system (greenhouse). Production, harvesting, processing, transporting, and distribution chains of fruit and vegetables have resulted in a huge amount of wastes as an alternative source to produce biofuels. In this study, optimization of two pretreatment processes (NaOH and HCl assisted thermal) was investigated to enhance methane production from fruit and vegetable harvesting wastes (FVHW) that originate from greenhouses. NaOH concentration (0–6.5%), HCl concentration (0–5%), reaction temperature (60–100 °C), solid content (1–5%), time of reaction (1–5 h), and mixing speed (0–500 rpm) were chosen in a wide range of levels to optimize the process in a broad design boundary and to evaluate the positive and negative impacts of independent variables along with their ranges. Increasing NaOH and HCl concentrations resulted in higher COD solubilization but decreased the concentration of soluble sugars that can be converted directly into methane. Thus, the increasing concentrations of NaOH and HCl in the pretreatments have resulted in low methane production. The most important independent variables impacting COD and sugar solubilization were found to be chemical concentration (as NaOH and HCl), solid content and reaction temperature for the optimization of pretreatment processes. The high amount of methane productions in the range of 222–365 mL CH4 gVS−1 was obtained by the simple thermal application without using chemical agents as NaOH or HCl. Maximum enhancement of methane production was 47–68% compared to raw FVHW when 5% solid content, 1-hour reaction time and 60–100 °C reaction temperature were applied in pretreatments.

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Section: Naoh-assisted Thermal Pretreatmentmentioning

confidence: 99%

Impacts of Chemical-Assisted Thermal Pretreatments on Methane Production from Fruit and Vegetable Harvesting Wastes: Process Optimization

Günerhan¹,

Us²,

Dumlu

et al. 2020

Molecules

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“…The removal tests of dyes molecules from aqueous solution using the PC@alginate particles were conducted using a batch system. The effects of pH on the adsorption of dyes onto PC@alginate were investigated using 40 mL (10 mg L À1 ) at different pHs (3)(4)(5)(6)(7)(8)(9)(10)(11)(12). The pH of the solution was adjusted by adding small amounts of HCl (0.1 M) and NaOH (0.1 M) aqueous solutions to various PC@alginate dispersions.…”

Section: Mb Molecule Removal Experimentsmentioning

confidence: 99%

“…[5][6][7][8][9][10][11][12][13][14][15][16][17][18] However, these techniques are generally limited when applied separately, requiring coupling and/or hybrid processes. 5 To better understand the complexity of agri-food waste treatment based on single techniques, the anaerobic digestion process (AD) was taken as an example. In the AD process, the degradation of agri-food wastes to bio-methane (75%) was performed using microorganisms under certain temperature and pressure conditions, and this technique was highly recommended for these types of waste in terms of energy production.…”

Section: Introductionmentioning

confidence: 99%

Core–shell architecture based on bio-sourced porous carbon: the shape formation mechanism at the solid/liquid interface layer

2019

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“…8 Adsorption and anaerobic co-digestion (ACD) processes were used with high efficiencies to address these environmental issues. 9−21 However, it is worth noting that these processes often have disadvantages, such as the recovery mass in the adsorption process, the separation of liquid and solid phases after adsorption, and the resulting coproducts (digestate) from the anaerobic process. 22−34 Nonetheless, significant limitation is that each technique can manage only one of the numerous ecological issues.…”

Section: Introductionmentioning

confidence: 99%

Combined Methane Energy Recovery and Toxic Dye Removal by Porous Carbon Derived from Anaerobically Modified Digestate

et al. 2019

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Valorization of agri-food organic waste in order to reach zero waste using cleaner methods is still a challenge. Therefore, both anaerobic co-digestion (ACD) (biological process) and adsorption (physicochemical process) were used in combination for this objective. ACD allows the activation of biodegradable organic matter by microbial action and produces a digestate (co-product). This coproduct was used as a raw material to produce porous carbon having a high specific surface area after chemical treatment using sulfuric acid and thermal activations at temperature T = 350 °C. The resulted material was used for the preparation of core–shell particles with a core made of porous carbon and a shell consisting mainly of alginate and a calcium ion layer. The final core–shell particles were then used for dye treating wastewater and solving the solid–liquid separation problem in the adsorption process. We show here that in the ACD process, significant bio-methane potential (BMP) was produced. Furthermore, the data indicate that 153 L CH 4 kg·SV –1 of BMP was produced under optimum conditions of pH = 8 and inoculum/load ratio = 1.2. The overall results concerning the methylene blue (MB) adsorption from water onto the core–shell particles show the occurrence of a maximum adsorbed amount equal to 26.178 mg g –1 , and good agreement was found between the experimental adsorption data with pseudo-second-order and Langmuir theoretical models. The response surface methodology coupled with the central composite design has allowed the identification of optimal conditions for MB removal and has led to the elucidation of adsorption mechanism and the regeneration of the adsorbent without the occurrence of the solid/liquid separation problem.

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Optimization of electrocoagulation process and combination of anaerobic digestion for the treatment of pistachio processing wastewater

Cited by 35 publications

References 31 publications

Impacts of Chemical-Assisted Thermal Pretreatments on Methane Production from Fruit and Vegetable Harvesting Wastes: Process Optimization

Impacts of Chemical-Assisted Thermal Pretreatments on Methane Production from Fruit and Vegetable Harvesting Wastes: Process Optimization

Core–shell architecture based on bio-sourced porous carbon: the shape formation mechanism at the solid/liquid interface layer

Combined Methane Energy Recovery and Toxic Dye Removal by Porous Carbon Derived from Anaerobically Modified Digestate

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