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The proposed photovoltaic electrochemical (PV-EC) process combines autonomous and environmentally friendly photovoltaic
solar energy with the capability of the combined electrocoagulation/electrooxidation process to effectively remediate toxic
olive mill wastewaters and simultaneously produce electrolytic hydrogen. The photovoltaic array can be con...
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... photovoltaic output current and consequently the performance of the electrochemical process. As already stated, the flow rate of treated wastewater can be used as a control parameter. The most important characteristics of the current-voltage curve of the photovoltaic module for solar irradiation of 1000 W·m −2 and temperature of 25°C are given in Fig. 2. The short circuit current I sc is the maximum current supplied by the PV panel at zero voltage between terminals. It depends mainly on solar irradiation and is 6.46 amperes. The open circuit voltage is the maximum voltage reached in the absence of load. It depends mainly on temperature and is 64.9 volts. The photovoltaic panel also ...
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![Figure 1. Schematic of the electrocoagulation process [12]](profile/Aryanti-Ptp/publication/349575782/figure/fig1/AS:1011234841317376@1618108582050/Schematic-of-the-electrocoagulation-process-12_Q320.jpg)
Hotels used a considerable amount of water and chemicals for guest rooms, pools, landscaping, laundry, gardening, and other activities, depending on hotel categories. In this research, the liquid waste of the hotel was treated by a combination of mixing and electrocoagulation process to produce clean water, which was safely discharged into the envi...
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... In this case, if the quality of the effluent is still unsatisfactory a post-treatment biological processes systems or low-rate stabilization ponds and constructed wetland sis applied. However, the use of an aerobic treatment variation is not always possible in cases of extremely high organic load, non-biodegradable or toxic constituents and similar unfavourable conditions [2]. An auspicious technique for the post-treatment of effluents with high organic load is the use of electrochemical processes. ...
Electrochemical treatment is an effective method to improve physicochemical characteristics of effluents and to minimize the environmental footprint of anaerobic digestion facilities. In the present research an anaerobic digester effluent was subjected to post-treatment, using electro-oxidation or electrocoagulation processes for significant reduction of Chemical oxygen demand and ammonia. A combined electro-oxidation and electrocoagulation treatment was also performed. Results show satisfactory decrease of both Chemical oxygen demand and ammonium nitrogen, which however were relative to the method applied, the time duration and the current intensity. A combined use of both methods may be the best solution for the post-treatment of this high burden effluent. All the presented values have occurred from experiments in the Chemistry Department of the International Hellenic University.
... Targeting on waste management, various systems have been proposed and examined for the treatment/valorization of OMW employing usually biological, physicochemical, and advanced oxidation methods [11]. Such methods include aerobic [12] and anaerobic [13] bioprocesses, coagulation, adsorption [14], use of membrane systems [15], chemical and electrochemical treatment [16,17] and recovery, such as added-value compounds for plant disease control in view of reducing the chemical/synthetic pesticides [18]. However, due to the high contained amounts of organic compounds in OMW, research interest has also been focused on the development of bioreactors targeting on organic load valorization through the production of gaseous biofuels [19,20]. ...
Olive mill wastewater is the main by-product derived from olive mills using the three-phase extraction process, displaying a serious environmental risk due to its notable content in organics and phenolics. This work focused on a high-rate thermophilic anaerobic digester development, able to remove high organic load amounts, by converting it to biogas. The proposed system is an upflow packed bed reactor with recycling stream and biomass carriers appropriate for inoculum colonization. An anaerobic inoculum was acclimatized under thermophilic conditions and subsequently added into the reactor. Its performance examination against twice-centrifuged olive mill wastewater of 40 g COD/L followed, testing several runs of gradually decreased hydraulic retention time, reaching steady-state conditions until the minimum of 4.2 days, while optimum performance was achieved at 5.6 days. The production of 9.51 ± 0.37 NLCH4/LFeed is considered quite promising for the high-rate anaerobic treatment plants development for olive mill wastewater valorization, without the need of co-digestion.
... Currently, a myriad of different techniques are applied to treat saline wastewaters that may depend on the type of food wastewater ( Table 1). Some of these treatments are based on chemical coagulation-flocculation (Silva et al., 2009;Michael et al., 2014), membrane filtration (Nora'aini et al., 2005;Enaime et al., 2018), electrocoagulation (Elaouani et al., 2018;Marmanisa et al., 2018), solar photo-Fenton oxidation (Ioannou-Ttofa et al., 2017), advanced oxidation processes (Cataldo et al., 2016;Kilic et al., 2018), multiple effect distillation system (Carnevale et al., 2016;Zhang et al., 2016), wetlandmicrobial fuel cell system (Xu et al., 2019) and hybrid processes (Grafias et al., 2010). Additionally, some physical methods based on the mechanical vapor compression can rapidly remove the organic and inorganic load from the wastewater and contribute to the crystallization of salts . ...
This study deals with the biological treatment of saline wastewaters generated by olive oil and fish canning industries using Yarrowia lipolytica. The ability of the halophilic yeast Y. lipolytica was studied on the dephenolated olive mill wastewater (DOMW)/ tuna wash processing wastewater (TWPW) mixtures at different proportions. Our results showed that DOMW/TWPW (75:25) is the suitable mixture for the highest Y. lipolytica biomass production reaching 11.3 g L⁻¹ after 7 days. In addition, our results showed significant removal of chemical oxygen demand (COD) and phosphorus of 97.49 % and 98.90 %, respectively. As well as, a total removal of nitrogen was observed at the end of the experiment. On the other hand, Y. lipolytica was found to be effective in removing salts from these mixtures reaching 92.21 %. Moreover, the analytical results using Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and scanning electron microscopy (SEM) confirmed the biosorption of NaCl on the surface of the yeast as nanocrystals form. Hence, Y. lipolytica can be considered as a promising candidate for the simultaneous remediation and desalination of saline food wastewater.
... Electrochemical processes are considered of interest for industrial wastewater treatment [11][12][13][14]. These technologies have been successfully applied to enhance the biodegradability of recalcitrant organics, to oxidize ammonia and sulphides and to disinfect anaerobic effluents from pathogenic microorganisms [15][16][17][18][19]. Electrooxidation (EO) using boron-doped diamond (BDD) electrodes can directly oxidize organic compounds and ammonia [20,21]. ...
... However, treatment costs can be high due to the direct use of electrical energy. Recently, the use of photovoltaic cells, which can be a solution to reduce costs arising from electrical energy, was discussed in the literature (Ganiyu et al., 2019;Ouzounis et al., 2018). Also, it is possible to reduce system costs by optimizing the reactor/electrode designs and operational parameters affecting the system. ...
Paint manufacturing wastewaters contain highly toxic and organic biorefractory substances and have adverse effects on human health. In this study, the removal of color and chemical oxygen demand (COD) from a paint manufacturing plant (PMW) wastewater by electrochemical degradation using Ti/Pt anodes were investigated with a five-factor central composite model. pH (4–11), temperature (10–40°C), NaCl concentration (10–100 mM), current (5–15 A) and feed rate (10–40 mL/min.) were selected as independent operating parameters. The results obtained were analyzed with analysis of variance and a quadratic model was developed to examine the effects of parameters affecting degradation conditions. Optimum conditions for maximizing color and COD removal while minimizing energy consumption were determined by numerical optimization and found to be pH of 4, temperature of 39.99 °C, NaCl concentration of 100 mM, feed rate of 40 mL/min and current of 5.21 A. Under optimum conditions, the estimated color removal was 79.68% and the COD removal was 80.54%. The compatibility of the predicted optimum conditions was confirmed by experimental data. In experiments performed under optimum conditions, the energy consumed by the system was calculated as 8.51 kWh/m³ and the operating cost to treat 1 m³ PMW was determined as $1.02.
In this study, the effectiveness of ozone (O3), ozone+hydrogen peroxide (O3+H2O2) and fenton (Fe2++H2O2) processes were investigated in the treatment of olive mill wastewater obtained from an olive oil production facility operating in Balıkesir province. Firstly, the ozone generator was operated with a 10% capacity. Ozonation was performed for 6 hours at three different pH values (4.75, 10 and 11) and the maximum removal efficiency was calculated as 15.27% when the pH value was 11. Secondly, the ozone generator was operated with a 10% capacity and an avarage of 500 mg L-1 H2O2 was added. After this 6 hour experiment, the removal efficiency was obtained as 9.8%. Finally, in the fenton process, where the effects of Fe2+ (2.014 g L-1 and 4.028 g L-1) and H2O2 (19.05, 44.44 and 80 g L-1) concentrations were examined for the treatment of olive mill wastewater, the remained concentrations of COD decreased continuously at the and of the experinent when Fe2+ and H2O2 concentrations increased. The concentrations of Fe2+ and the H2O2 were set at 4.029 mg L-1 and 80 mg L-1 respectively, and COD removal was achieved at the rate of 81.94%. The results obtained from the experiments revealed that the fenton process has much more effeciency than other processes.
