Impact of Advanced Oxidation Processes on the Composition and Biodegradability of Soluble Organic Nutrients in Wastewater Effluents
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Impact of Advanced Oxidation Processes on the Composition and Biodegradability of Soluble Organic Nutrients in Wastewater Effluents: (WERF Research Report Series)

Impact of Advanced Oxidation Processes on the Composition and Biodegradability of Soluble Organic Nutrients in Wastewater Effluents: (WERF Research Report Series)


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About the Book

The characteristics and bioavailability of wastewater derived “refractory” organic nutrients and their susceptibility to removal has drawn significant attention from both regulatory agencies and wastewater utilities. As suggested by recent studies, the bioavailability of effluent organic nutrients to algae is relatively high. This implies that discharge of effluent organic nutrients from water resource recovery facilities (WRRFs) may contribute to the eutrophication potential. Therefore, investigation into alternative technologies for organic nutrients transformation and reduction, and the mechanisms involved in those processes, is warranted with the ultimate goal of improved eutrophication control. Advanced oxidation processes (AOPs) have been shown to be capable of reducing the concentrations of soluble organic nutrients and converting specific nutrient-containing organic compounds into simpler or more biodegradable forms. The overall objective of this study was to investigate the impact of AOP treatments on the speciation and composition of soluble nutrients and consequently their biodegradability in wastewater effluents. Secondary or tertiary effluents from three selected wastewater treatment plants were collected. Each effluent was treated with three different AOPs, including low-pressure ultraviolet (UV) irradiation, hydrogen peroxide (H2O2), and a combination of UV and H2O2. Both untreated and AOP-treated effluents were subjected to a comprehensive analysis for wastewater characterization, nitrogen speciation analysis, phosphorus speciation analysis, and soluble organic nitrogen (SON) biodegradability assays. The AOP processes at the conditions applied did not lead to significant changes in the SON concentrations for the wastewater effluents examined. However, fingerprinting and quantification of the dissolved organic matter (DOM) in untreated and AOP treated samples using fluorescence spectroscopy combined with parallel factor analysis revealed changes in DOM pool composition with various AOP treatments. This suggests that there may also be changes in organic nutrients composition. Based on biodegradability assessments, AOP treatments likely changed the composition and biodegradability of the SON compounds in the effluents. The impact of AOP treatments on effluent biodegradable SON (BSON) varied depending on the effluent and the AOP treatment. The BSON concentration increased by 0.02-0.2 mg/L (4-47%) after AOP treatment in one effluent, while the concentration decreased by 0.12-0.14 mg/L (60-69%) in another sample. For the secondary effluent sample, release of ammonia (0.04-0.1 mg/L) was observed during 15-day BSON incubation period for those samples treated with H2O2 or UV/H2O2, suggesting that the AOP treatments might lead to oxidation of colloidal organic matter in the filtered effluent. Comparison of the results among the three different AOPs indicated that the combined UV/H2O2 treatment was more effective at oxidizing some of the organic or organically bound nutrients. The impact of AOP treatment on effluent soluble organic phosphorus (SOP) composition varied depending on the effluents. For two WRRFs, AOP treatment at the dose conditions applied led to a decrease in the SOP level and seemed to convert it into SAHP, indicating a possible increase in effluent soluble phosphorus bioavailability. Comparison of the results among the three different AOPs indicated that the combined UV/H2O2 treatment was more effective at oxidizing some of the organic or organically-bound P compounds into a more readily removable form than either UV or H2O2 alone. With the limited number of effluents evaluated and under the conditions applied in this study, AOP treatments did not seem to significantly increase the biodegradability of SON. Therefore the proposed SON removal via AOP followed by biological treatment does not seem to be promising. Further investigation with more effluents is needed. Economic or LCA analysis should be performed to assess the overall benefits compared to the cost of implementing high-cost advanced treatment processes such as AOP. Other nutrient control measures and regulations should also be considered.


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Product Details
  • ISBN-13: 9781780408040
  • Publisher: IWA Publishing
  • Publisher Imprint: IWA Publishing
  • Language: English
  • Series Title: WERF Research Report Series
  • ISBN-10: 1780408048
  • Publisher Date: 15 Mar 2016
  • Binding: Digital download
  • No of Pages: 70


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Impact of Advanced Oxidation Processes on the Composition and Biodegradability of Soluble Organic Nutrients in Wastewater Effluents: (WERF Research Report Series)
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Impact of Advanced Oxidation Processes on the Composition and Biodegradability of Soluble Organic Nutrients in Wastewater Effluents: (WERF Research Report Series)
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