An experimental study on the simultaneous removal of NO and SO2 with a new wet recycling process based on the micro-nano bubble water system

Xiao, Zhengguo; Li, Dengxin; Zhang, Rongliang; Wang, Feikun; Pan, Fanfeng; Sun, Zhihong

doi:10.1007/s11356-019-07136-0

Cited by 8 publications

(2 citation statements)

References 56 publications

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“…Their negative surface charge, low buoyancy, and longevity facilitate oxygen solubility, properties which have resulted in NBs being applied in a range of fields, including biomedical research and drug delivery [37], water treatment [40,41] and ecological restoration. Ecological applications in lakes include the reduction of methylmercury production [42,43], the decrease in greenhouse gas emissions from lake sediments [35,44,45] and increasingly, the remediation of degraded, eutrophic lake ecosystems.…”

Section: Applications and Manufacturementioning

confidence: 99%

Oxygen Nanobubbles for Lake Restoration—Where Are We at? A Review of a New-Generation Approach to Managing Lake Eutrophication

Waters

Hamilton

Pan

et al. 2022

Water

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Nutrient enrichment of lakes from anthropogenic activities is a significant and increasing issue globally, impairing the health, biodiversity and service provisioning from lakes, with impacts on cultural, recreational, economic and aesthetic values. Internal nutrient loads from lakebed sediment releases are a primary cause of lake eutrophication and have necessitated geoengineering methods to mitigate releases and speed up recovery from eutrophication. Our objective in this review was to evaluate the use of oxygen nanobubbles as a geoengineering technology to remediate low oxygen conditions at the lake sediment/water interface, as a precursor to alleviating eutrophication linked to high internal nutrient loads. Oxygen nanobubbles (NBs) are bubbles < 1000 nm formed at the interface of solid surfaces and aqueous solutions. These bubbles have higher density than water, persist for longer and facilitate greater oxygen solubility than larger bubbles. Methods have been developed to enable NB formation at the surface of carrier materials, which are then used in conjunction with modified local soils (MLSs), to ‘floc, lock and oxygenate’ to strip nutrients from the water column, locking them in lakebed sediments and oxygenating the sediments to prevent re-release of nutrients. Most studies of NBs for lake restoration have thus far only demonstrated their potential for this purpose, using short-term, small-scale core incubations conducted mainly in laboratory settings. Work is required to (1) address scalability, including procurement and cost, (2) extend laboratory incubation studies to large outdoor enclosures and pond/lake trials, (3) examine longevity of the effects in the natural environment, including potential for MLSs to smother benthos and/or have toxic effects, and (4) extend to a range of lake environments and MLS types. Legal, cultural and social acceptance of the technology is another prerequisite of applications in the natural environment and requires individualised analysis. Until these issues are addressed in a systematic way that addresses scalability and recommends suitable carrier materials and MLSs, NBs may continue to remain largely untried as a geoengineering method to address lake eutrophication.

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Section: Applications and Manufacturementioning

confidence: 99%

Oxygen Nanobubbles for Lake Restoration—Where Are We at? A Review of a New-Generation Approach to Managing Lake Eutrophication

Waters

Hamilton

Pan

et al. 2022

Water

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“…As for the simultaneous removal of NOx, SO 2 and Hg 0 , the key issue is to remove nitric oxide (NO) and Hg 0 efficiently and rapidly because NO, which is sparsely soluble in water, accounts for 90%~95% of NOx in flue gas (Zhao et al, 2016) and Hg 0 is insoluble in the water. According to the literature and our previous study, micro-nanobubbles (MNBs) can spontaneously generate a large amount of hydroxyl free radicals (• OH) with a high oxidizing ability (Takahashi et al, 2007;Xiao et al, 2019bXiao et al, , 2020a, which can not only oxidize NO into NO 2 but oxidize Hg 0 into mercuric hydroxide or mercuric oxide, as shown in reaction (1) (Zhao et al, 2014a(Zhao et al, , 2014b. Liu et al (2015) conducted the simultaneous removal of NO, SO 2 and Hg 0 by using a Fenton-like reagent based on Fe 3+ in a spray reactor, and the results showed that • OH generated from the Fenton-like regent played a critical role in the removal of NO, SO 2 and Hg 0 , and the removal efficiencies of NO, SO 2 and Hg 0 were 85.3%, 100% and 100%, respectively, under the optimal conditions.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous removal of NO, SO₂ and Hg⁰ with the WDRMRS

Deng

Xiao

et al. 2021

Environmental Technology

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Micro-nanobubbles can spontaneously generate hydroxyl free radicals (• OH). Urea is a cheap reductant and can react with NOx species, and their products are nontoxic and harmless N 2 , CO 2 and H 2 O. In this study, a Wet Direct Recycling Micro-nanobubble Flue Gas Multi-pollutants Removal System (WDRMRS) was developed for the simultaneous removal of NO, SO 2 and Hg 0 . In this system, a micro-nanobubble generator (MNBG) was used to produce a micro-nanobubble gas-liquid dispersion system (MNBGLS) through recycling the urea solution from the reactor and the simulated flue gas composed of N 2 , NO, SO 2 and Hg 0 . The MNBGLS, which has a large gas-liquid dispersion interface, was recycled continuously from the MNBG to the reactor, thus achieving cyclic absorption of various pollutants. All of the investigated parameters, including the initial pH and temperature of the absorbent as well as the concentrations of urea, NO and SO 2 had significant effects on the NO removal efficiency but did not significantly affect the SO 2 removal efficiency, whereas only the initial solution pH and NO concentration affected the Hg 0 removal efficiency. The analysis results of the reaction mechanism showed that • OH played a critical role in the removal of various pollutants. After the treatment by this system, the main removal products were HgO sediment, SO 4 2− and NH 4+ which could be easily recycled.

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Oxidative leaching of sandstone uranium ore assisted by ozone micro-nano bubbles

Zhang

Hou

Wang

et al. 2022

J Radioanal Nucl Chem

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An experimental study on the simultaneous removal of NO and SO2 with a new wet recycling process based on the micro-nano bubble water system

Cited by 8 publications

References 56 publications

Oxygen Nanobubbles for Lake Restoration—Where Are We at? A Review of a New-Generation Approach to Managing Lake Eutrophication

Oxygen Nanobubbles for Lake Restoration—Where Are We at? A Review of a New-Generation Approach to Managing Lake Eutrophication

Simultaneous removal of NO, SO₂ and Hg⁰ with the WDRMRS

Oxidative leaching of sandstone uranium ore assisted by ozone micro-nano bubbles

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An experimental study on the simultaneous removal of NO and SO2 with a new wet recycling process based on the micro-nano bubble water system

Cited by 8 publications

References 56 publications

Oxygen Nanobubbles for Lake Restoration—Where Are We at? A Review of a New-Generation Approach to Managing Lake Eutrophication

Oxygen Nanobubbles for Lake Restoration—Where Are We at? A Review of a New-Generation Approach to Managing Lake Eutrophication

Simultaneous removal of NO, SO2 and Hg0 with the WDRMRS

Oxidative leaching of sandstone uranium ore assisted by ozone micro-nano bubbles

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Simultaneous removal of NO, SO₂ and Hg⁰ with the WDRMRS