Integrated treatment of reverse osmosis brines coupling electrocoagulation with advanced oxidation processes

Azerrad, Sara P.; Isaacs, Mor; Dosoretz, Carlos G.

doi:10.1016/j.cej.2018.09.068

Cited by 48 publications

(8 citation statements)

References 46 publications

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“…The WWROC samples were collected from the Technion's effluent-desalination pilot plant, located at the wastewater treatment plant (WWTP) of Nir Ezyon, Israel (Figure 1). The pilot plant was already described in detail elsewhere [15]. Generally, it comprised of an ultrafiltration (UF) system, followed by a two-stage RO unit, generate permeate at about 85% total recovery.…”

Section: Wwroc Sample Preparationmentioning

confidence: 99%

“…These concentrations of these metals can rise to 100-1000 µg/L if the RO process is efficiently operated, increasing their toxic effects. High levels of nutrients, mainly nitrogen and phosphorus (as NO 3 − and PO 4 3− ) have been found in WWROC, ranging from 20-155 mg/L and 5-65 mg/L, respectively [14][15][16]. As a result, direct disposal of the WWROC will pose a threat to aquatic ecosystems.…”

Section: Introductionmentioning

confidence: 99%

“…Alternative techniques have been studied in the last few decades for efficient TOrC removal, including soil aquifer treatment [25], UV photolysis, and advanced oxidation processes (AOPs) using UV/TiO 2 [26][27][28], UV/H 2 O 2 [29][30][31], and ozonation [32,33]. AOPs have been successfully implemented on WWROC matrices for TOrC removal [13,15,17,27]. The advantage of the AOP is that it is a destructive process, with a chemical-physical degradation mechanism that oxidizes molecules such that they become more biodegradable or may even reach full mineralization.…”

Section: Introductionmentioning

confidence: 99%

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Trace Organic Compound Removal from Wastewater Reverse-Osmosis Concentrate by Advanced Oxidation Processes with UV/O3/H2O2

et al. 2020

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Advanced technologies, such as reverse osmosis (RO), allow the reuse of treated wastewater for direct or indirect potable use. However, even highly efficient RO systems produce ~10–15% highly contaminated concentrate as a byproduct. This wastewater RO concentrate (WWROC) is very rich in metal ions, nutrients, and hard-to-degrade trace organic compounds (TOrCs), such as pharmaceuticals, plasticizers, flame retardants, and detergents, which must be treated before disposal. WWROC could be up to 10 times more concentrated than secondary effluent. We examined the efficiency of several advanced oxidation processes (AOPs) on TOrC removal from a two-stage WWROC matrix in a pilot wastewater-treatment facility. WWROC ozonation or UV irradiation, with H2O2 addition, demonstrated efficient removal of TOrCs, varying between 21% and over 99% degradation, and indicating that radical oxidation (by HO·) is the dominant mechanism. However, AOPs are not sufficient to fully treat the WWROC, and thus, additional procedures are required to decrease metal ion and nutrient concentrations. Further biological treatment post-AOP is also highly important, to eliminate the degradable organic molecules obtained from the AOP.

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Section: Wwroc Sample Preparationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Trace Organic Compound Removal from Wastewater Reverse-Osmosis Concentrate by Advanced Oxidation Processes with UV/O3/H2O2

et al. 2020

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“…The Fenton process is mostly applied for the removal of organic compounds from liquid effluents (Pera-Titus et al, 2004). Several studies have been developed to improve the performance of the Fenton process by association with electrical energy, light, magnetism, nanoparticle application, electrocoagulation, ultrasound, the use of rotating fixed bed reactors and some alternative materials to replace Fe +2 ions (Babuponnusamy and Muthukumar, 2014;Azerrad et al, 2019). Another production process for hydroxyl radical formation is the use of ultrasound.…”

Section: Introductionmentioning

confidence: 99%

Treatment of swine wastewater using the Fenton process with ultrasound and recycled iron

et al. 2020

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Pork production involves the generation of wastewater containing a high pollutant load. Although the biological systems show satisfactory efficiency for the treatment of these effluents, they demand an elevated area for installation and high production of biological sludge. Alternatively, oxidative processes are an alternative for treating such effluents, requiring minor areas and increasing the efficiency of the treatment. We studied the Fenton process assisted with ultrasound for the treatment of swine slaughterhouse wastewater. Nails used in civil construction were used as the iron source. We evaluated the influence of pH, contact time, nail mass, and hydrogen peroxide concentration on color removal, turbidity, chemical oxygen demand (COD) and biochemical oxygen demand (BOD5). The removal of nutrients and oils and greases was also evaluated. The best results using the ultrasound-assisted Fenton process were obtained at pH 3, hydrogen peroxide concentration 90 mg L-1, and a nail unit (2.7g). In these conditions, color, turbidity, COD, and BOD5 removal of 98, 98.2, 84.6, and 98%, respectively, were achieved. The reduction in the other parameters evaluated was above 70%. Catalytic activity maintained above 90% until the sixth cycle of use. In general, the ultrasound-assisted Fenton process using the nail as a catalyst would be an alternative for the treatment of swine slaughterhouse wastewater. This alternative is responsible for the higher removal of organic load and nutrients in a shorter time when compared with biological systems.

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“…Advanced oxidation process (AOP) [1][2][3] is one of the most popular approaches used for textile industry wastewater treatment. Among all AOPs, the photocatalytic method is usually adopted due to its convenience.…”

Section: Introductionmentioning

confidence: 99%

Preparation of a nanoporous Cu–Ag solid solution with enhanced sono-Fenton-like catalytic activity

Wang

Chu

et al. 2019

RSC Adv.

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Integrated treatment of reverse osmosis brines coupling electrocoagulation with advanced oxidation processes

Cited by 48 publications

References 46 publications

Trace Organic Compound Removal from Wastewater Reverse-Osmosis Concentrate by Advanced Oxidation Processes with UV/O3/H2O2

Trace Organic Compound Removal from Wastewater Reverse-Osmosis Concentrate by Advanced Oxidation Processes with UV/O3/H2O2

Treatment of swine wastewater using the Fenton process with ultrasound and recycled iron

Preparation of a nanoporous Cu–Ag solid solution with enhanced sono-Fenton-like catalytic activity

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