Characterization and biotoxicity assessment of dissolved organic matter in RO concentrate from a municipal wastewater reclamation reverse osmosis system

Sun, Yingxue; Gao, Yue; Hu, Hong-Ying; Tang, Fang; Yang, Zhe

doi:10.1016/j.chemosphere.2014.09.024

Cited by 45 publications

(5 citation statements)

References 35 publications

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“…In recent decades, significant improvements have been made to overcome chemical and microbial threats [15] to water supplies, mainly through a series of treatment strategies such as membrane filtration [16][17][18][19][20][21][22], the advanced oxidation process (AOP) [23,24] and bioremediation. Contaminants, such as 1,4-dioxane, considered a contaminant of emerging concern, can be treated via reverse osmosis in combination with AOP to comply with water quality guidelines that stipulate only 1 µg/L [1].…”

Section: Introductionmentioning

confidence: 99%

Efficacy of Continuous Flow Reactors for Biological Treatment of 1,4-Dioxane Contaminated Textile Wastewater Using a Mixed Culture

Lee¹,

Khan

Inam

et al. 2022

Fermentation

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The goal of this study was to evaluate the biodegradation of 1,4–dioxane using a mixed biological culture grown in textile wastewater sludge with 1,4–dioxane as the sole carbon source. The conditions for the long-term evaluation of 1,4–dioxane degradation were determined and optimized by batch scale analysis. Moreover, Monod’s model was used to determine the biomass decay rate and unknown parameters. The soluble chemical oxygen demand (sCOD) was used to determine the concentration of 1,4–dioxane in the batch test, and gas chromatography/mass spectrometry (GC/MS) was used to measure the concentrations via long-term wastewater analysis. Two types of reactors (continuous stirred reactor (CSTR) and plug flow reactor (PFR)) for the treatment of 1,4–dioxane from textile wastewater were operated for more than 120 days under optimized conditions. These used the mixed microbial culture grown in textile wastewater sludge and 1,4–dioxane as the sole carbon source. The results indicated efficient degradation of 1,4–dioxane by the mixed culture in the presence of a competitive inhibitor, with an increase in degradation time from 13.37 h to 55 h. A specific substrate utilization rate of 0.0096 mg 1,4–dioxane/mg MLVSS/h was observed at a hydraulic retention time of 20 h for 20 days of operation in a biomass concentration of 3000 mg/L produced by the mixed microbial culturing process. In the long-term analysis, effluent concentrations of 3 mg/L and <1 mg/L of 1,4–dioxane were observed for CSTR and PFR, respectively. The higher removal efficacy of PFR was due to the production of more MLVSS at 4000 mg/L compared to the outcome of 3000 mg/L in CSTR in a competitive environment.

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Section: Introductionmentioning

confidence: 99%

Efficacy of Continuous Flow Reactors for Biological Treatment of 1,4-Dioxane Contaminated Textile Wastewater Using a Mixed Culture

Lee¹,

Khan

Inam

et al. 2022

Fermentation

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“…Reverse osmosis (RO) is increasingly used for the tertiary treatment and indirect reuse of the secondary effluent from urban wastewater. The concentrate resulting from the filtration processes commonly contains high concentrations of dissolved salts, recalcitrant organics, and trace organic compounds (TOrCs) (Sun et al, 2014;Westerhoff et al, 2009). In particular, the strength and recalcitrance of effluent organic matter (EfOM) can be affected by both the characteristics of the raw sewage and the performance of the reclamation processes typically involved in biological treatment processes.…”

Section: Introductionmentioning

confidence: 99%

The growth of Scenedesmus quadricauda in RO concentrate and the impacts on refractory organic matter, Escherichia coli, and trace organic compounds

et al. 2018

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This study achieves a better operational simplicity for the phycoremediation of reverse osmosis (RO) concentrate using Scenedesmus quadricauda microalgae. Under continuous illumination with CO supplementation, algal growth in the RO concentrate resulted in a conversion of polymeric organic matter (a mixture of humic substances and polysaccharides) to biodegradable fractions and their prompt removal along with inorganic nutrients (NO and PO). The algal-induced degradation of humic-like substances which are typically refractory to microbial decomposition was demonstrated in an indirect manner. In this study, we also investigated the effects of algal treatment on the growth of Escherichia coli and removal of trace organic compounds (TOrCs) from the RO concentrate. Our results indicate that algal treatment of the RO concentrate using aeration with 10% (v/v) CO under continuous illumination is highly feasible as a safe and inexpensive technology to remove non- or slowly-biodegradable organic matter, reduce enteric bacteria, and attenuate TOrCs in wastewater. However, the results should not be generalized, but critically discussed, due to limitations of using the synthetic RO concentrate in evaluating the performance of wastewater remediation with microalgae.

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Section: Introductionmentioning

confidence: 99%

“…The organic contaminants in SRO concentrate comprise not only the concentrated dissolved organic matter (DOM) from primary RO concentrate but also chemical agents injected during the SRO concentrate minimization process. Depending on the wastewater source, these organic contaminants may induce genotoxicity, antiestrogenic activity and acute toxicity on aquatic organisms . Given that the nature and concentration of organic contaminants affect the efficiency of treatment processes, innovative and cost‐effective strategies are required to treat the SRO concentrate before disposal.…”

Section: Introductionmentioning

confidence: 99%

“…Depending on the wastewater source, these organic contaminants may induce genotoxicity, antiestrogenic activity and acute toxicity on aquatic organisms. [8][9][10] Given that the nature and concentration of organic contaminants affect the efficiency of treatment processes, innovative and cost-effective strategies are required to treat the SRO concentrate before disposal. Currently, several alternative processes have been investigated to remove DOM from primary or secondary RO concentrate, involving coagulation, activated carbon adsorption, advanced oxidation processes (AOPs) including UV/H 2 O 2 , ozonation, UV/TiO 2 and Fenton reagents, and biological treatments such as biological activated carbon.…”

Section: Introductionmentioning

confidence: 99%

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Potential of coagulation/GAC adsorption combined with UV/H₂O₂ and ozonation for removing dissolved organic matter from secondary RO concentrate

Zhang

Lin

et al. 2018

J of Chemical Tech & Biotech

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BACKGROUD Organic contaminants in secondary reverse osmosis (SRO) concentrate pose a severe threat to the ecosystem, due to their potential toxicity. In this study, potential of coagulation/granular activated carbon (GAC) adsorption combined with UV/H2O2 and ozonation for removing organic matter from industrial secondary RO concentrate was systematically investigated. RESULTS Coagulation with 2.0 mmol L−1 FeCl3 yielded 40% removal of dissolved organic carbon (DOC), while adsorption with 5 g L−1 GAC could boost the removal efficiency up to 78.2%. Fractionation results showed that both coagulation and GAC adsorption favored hydrophobic organics. UV/H2O2 oxidation was capable of removing 87.4% of DOC, which outperformed ozonation (58.2%). UV/H2O2 and ozonation showed similar behavior in dissolved organic matter (DOM) degradation: a portion of hydrophobic organics were first transformed into hydrophilic fractions prior to final mineralization. Conclusion Coupling of GAC as post‐treatment with a UV/H2O2 process yielded 97.9% removal of DOC and the corresponding electrical energy per order (EE/O) was decreased from 66.7 to 35.8 kWh m−3. Consequently, a simple UV/H2O2 and GAC hybrid process was proposed to be a suitable method for removing DOM from SRO concentrate. © 2018 Society of Chemical Industry

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Characterization and biotoxicity assessment of dissolved organic matter in RO concentrate from a municipal wastewater reclamation reverse osmosis system

Cited by 45 publications

References 35 publications

Efficacy of Continuous Flow Reactors for Biological Treatment of 1,4-Dioxane Contaminated Textile Wastewater Using a Mixed Culture

Efficacy of Continuous Flow Reactors for Biological Treatment of 1,4-Dioxane Contaminated Textile Wastewater Using a Mixed Culture

The growth of Scenedesmus quadricauda in RO concentrate and the impacts on refractory organic matter, Escherichia coli, and trace organic compounds

Potential of coagulation/GAC adsorption combined with UV/H₂O₂ and ozonation for removing dissolved organic matter from secondary RO concentrate

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Characterization and biotoxicity assessment of dissolved organic matter in RO concentrate from a municipal wastewater reclamation reverse osmosis system

Cited by 45 publications

References 35 publications

Efficacy of Continuous Flow Reactors for Biological Treatment of 1,4-Dioxane Contaminated Textile Wastewater Using a Mixed Culture

Efficacy of Continuous Flow Reactors for Biological Treatment of 1,4-Dioxane Contaminated Textile Wastewater Using a Mixed Culture

The growth of Scenedesmus quadricauda in RO concentrate and the impacts on refractory organic matter, Escherichia coli, and trace organic compounds

Potential of coagulation/GAC adsorption combined with UV/H2O2 and ozonation for removing dissolved organic matter from secondary RO concentrate

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Product

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Potential of coagulation/GAC adsorption combined with UV/H₂O₂ and ozonation for removing dissolved organic matter from secondary RO concentrate