Control of Nitrosamines, THMs, and HAAs in Heavily Impacted Water with O<sub>3</sub>‐BAC

Liao, Xiaobin; Chen, Chao; Yuan, Baoling; Wang, Jun; Zhang, Xiaojian

doi:10.5942/jawwa.2017.109.0057

Cited by 11 publications

(5 citation statements)

References 41 publications

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“…Ozone is important to achieving the desirable high CMF fluxes, but clearly its impact to form NDMA is more critical than chloramine which may be used to control RO membrane biofouling. Oxidation is known to greatly reduce the potential for NDMA formation in drinking water application [45] however ozone also induces NDMA formation when applied to wastewater. 7 out of 8 wastewater treatment plants surveyed for DBP formation associated an increase in NDMA as a result of the ozonation stage [46].…”

Section: N-nitrosamines Analysis Of Ceramic Membrane Permeatementioning

confidence: 99%

Effect of oxidation with coagulation and ceramic microfiltration pre-treatment on reverse osmosis for desalination of recycled wastewater

et al. 2018

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Oxidation and coagulation before ceramic microfiltration (CMF) greatly increases membrane flux, but is unconventional for reverse osmosis (RO) pre-treatment. Impacts to RO and the wastewater recycling scheme operating CMF at high flux conditions is little understood. In this work, wastewater was treated with ozone or ultraviolet/hydrogen peroxide (UVH) oxidation, coagulation, then CMF, to explore RO membrane performance at bench scale. Sustainable high CMF fluxes were confirmed using coagulation with either ozone or UVH. Uniquely for ozone, dosing 13 mg-O3/L for 15 minutes greatly increased toxic by-product Nnitrosodimethylamine (NDMA) to 33 ng/L. Dosing chloramine (common for RO biofouling control) added only up to 7 ng/L NDMA. RO tests on all pre-treated waters showed little variation to flux but oxidation significantly altered texture of RO fouling material from smooth and dense to porous and granular. Biofouling studies with model bacteria strain RO 22 (Pseudoalteromonas spp) showed higher organic biodegradability but biofilm analysis 2 revealed ozone-coagulant-CMF greatly limited extension of bacteria communities from the membrane surface suggesting oxidation reduces RO biofouling. The novel findings of reduction of RO biofouling risk with oxidation and coagulation for high flux CMF pretreatment identified in this work need to be demonstrated on different wastewater types over longer term.

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Section: N-nitrosamines Analysis Of Ceramic Membrane Permeatementioning

confidence: 99%

Effect of oxidation with coagulation and ceramic microfiltration pre-treatment on reverse osmosis for desalination of recycled wastewater

et al. 2018

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“…On the basis of the results of our pilot and field studies, we analyzed the performance of each process for removing organic matter (Table ). The results revealed that a combination of conventional and O 3 –BAC processes enables integrated removal of several organic materials, including bulk organic matter, DBPs, and biostability issues. − …”

Section: Strategies To Address Water Shortages and Contaminationmentioning

confidence: 99%

“…We developed a sequential chlorination process with short-term free chlorination and subsequent chloramination . Besides effectively inactivating micro-organisms, this method could also reduce THM and HAA yields or nitrosamine yield when compared with free chlorination or chloramination …”

Section: Strategies To Address Water Shortages and Contaminationmentioning

confidence: 99%

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A Tale of Two Water Supplies in China: Finding Practical Solutions to Urban and Rural Water Supply Problems

et al. 2019

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Access to safe drinking water is among the 17 United Nations sustainable development goals. As the largest developing country, China has confronted large challenges to providing safe and sufficient drinking water to its population of 1.4 billion under the conditions of limited water sources and ubiquitous water contamination. This Account outlines these challenges as well as the practical solutions implemented by Chinese water professionals. We first provide a general introduction of the water supply in China. Next, we describe the main challenges of water source shortages and source water contamination. The practical solutions developed by Chinese water professionals are the core part of this Account, to which we have devoted ourselves to and contributed in some issues and cases. The water supply in China is a binary system that reflects the gap between urban and rural communities. Both urban and rural water supplies have been subject to water source shortages and contamination. Water shortages are mainly solved by longdistance water transportation projects. Urban water utilities generally pay attention to organic matter, ammonia, algae, and chemical spills in source water while also focusing on micro-organisms and disinfection byproducts in tap water. Microorganisms are a widespread concern for rural water supplies, whereas arsenic, fluoride, and ammonia are an endemic concern in some rural communities. Investment in updating of treatment processes significantly benefits urban water supplies, and advanced treatment of ozonation and biologically activated carbon processes are now commonly used to ensure that strict drinking water quality standards are met. However, this is not the case for rural water supplies, where expensive advanced treatment is not affordable. Thus, improving rural water supplies requires approaches such as searching for sources with better water quality, using automated ultrafiltration instruments, or connecting to urban water supply distribution systems. For rural areas with high concentrations of arsenic or fluoride in source water, specific adsorbents are a practical way to help farmers. Similar challenges will be encountered elsewhere in the world; therefore, the practical solutions applied in China will be useful to other countries in different stages of development.

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“…When the human impact is something like eutrophication or urbanization, more complex characterization of the DOM may be necessary. Typically, the most difficult to remove DOM is colorless and hydrophilic from algal and microbially-derived DOM produced within aquatic ecosystems (Liao et al 2017), rather than the darker DOM that is of terrestrial origin (Golea et al 2017;Lavonen et al 2013;Yang et al 2015). During algal blooms, in systems with higher levels of autochthonous DOM (i.e., low SUVA), and/or with chloramine treatments, N-containing and regulated by-products can be produced above what are considered safe levels even when ambient DOC are low (e.g., Golea et al 2017;Lavonen et al 2013;Liao et al 2017;Yang et al 2015).…”

Section: The Chemical Composition Of the Dom Pool Can Modify Nutrient Cyclesmentioning

confidence: 99%

How humans alter dissolved organic matter composition in freshwater: relevance for the Earth’s biogeochemistry

et al. 2021

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Dissolved organic matter (DOM) is recognized for its importance in freshwater ecosystems, but historical reliance on DOM quantity rather than indicators of DOM composition has led to an incomplete understanding of DOM and an underestimation of its role and importance in biogeochemical processes. A single sample of DOM can be composed of tens of thousands of distinct molecules. Each of these unique DOM molecules has their own chemical properties and reactivity or role in the environment. Human activities can modify DOM composition and recent research has uncovered distinct DOM pools laced with human markers and footprints. Here we review how land use change, climate change, nutrient pollution, browning, wildfires, and dams can change DOM composition which in turn will affect internal processing of freshwater DOM. We then describe how human-modified DOM can affect biogeochemical processes. Drought, wildfires, cultivated land use, eutrophication, climate change driven permafrost thaw, and other human stressors can shift the composition of DOM in freshwater ecosystems increasing the relative contribution of microbial-like and aliphatic components. In contrast, increases in precipitation may shift DOM towards more relatively humic-rich, allochthonous forms of DOM. These shifts in DOM pools will likely have highly contrasting effects on carbon outgassing and burial, nutrient cycles, ecosystem metabolism, metal toxicity, and the treatments needed to produce clean drinking water. A deeper understanding of the links between the chemical properties of DOM and biogeochemical dynamics can help to address important future environmental issues, such as the transfer of organic contaminants through food webs, alterations to nitrogen cycling, impacts on drinking water quality, and biogeochemical effects of global climate change.

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Control of Nitrosamines, THMs, and HAAs in Heavily Impacted Water with O₃‐BAC

Cited by 11 publications

References 41 publications

Effect of oxidation with coagulation and ceramic microfiltration pre-treatment on reverse osmosis for desalination of recycled wastewater

Effect of oxidation with coagulation and ceramic microfiltration pre-treatment on reverse osmosis for desalination of recycled wastewater

A Tale of Two Water Supplies in China: Finding Practical Solutions to Urban and Rural Water Supply Problems

How humans alter dissolved organic matter composition in freshwater: relevance for the Earth’s biogeochemistry

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Control of Nitrosamines, THMs, and HAAs in Heavily Impacted Water with O3‐BAC

Cited by 11 publications

References 41 publications

Effect of oxidation with coagulation and ceramic microfiltration pre-treatment on reverse osmosis for desalination of recycled wastewater

Effect of oxidation with coagulation and ceramic microfiltration pre-treatment on reverse osmosis for desalination of recycled wastewater

A Tale of Two Water Supplies in China: Finding Practical Solutions to Urban and Rural Water Supply Problems

How humans alter dissolved organic matter composition in freshwater: relevance for the Earth’s biogeochemistry

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Control of Nitrosamines, THMs, and HAAs in Heavily Impacted Water with O₃‐BAC