Effect of Shrinking Microbubble on Gas Hydrate Formation

Takahashi, Masayoshi; Kawamura, Taro; Yamamoto, Yoshitaka; Ohnari, Hirofumi; Himuro, Shouzou; Shakutsui, Hideaki

doi:10.1021/jp022210z

Cited by 202 publications

(108 citation statements)

References 6 publications

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“…Kamali and Khodaparast (2015) cited various studies in which enzymatic treatments tended to improve the flux through membranes used for treating the effluent from P&P mills. An alternative approach for the prevention of fouling and clogging of membranes is the generation and use of microbubbles, as discussed by Takahashi et al (2003), Agarwal et al (2012), andYerushalmi (2014). Microbubbles are produced when gas-saturated water passes through the membranes.…”

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confidence: 99%

“…In addition, they have the tendency of shrinking under water due to the surface tension and dissolution of gas in the surrounding water. According to the Young-Laplace equation (Takahashi et al 2003;Agarwal et al 2012), the shrinking of microbubbles leads to the progressive increase in their internal pressure until they collapse. The high pressure spot created at the final stage of microbubbles collapse produces pressure waves that will be distributed in the vicinity of a collapsing bubble and will promote the detachment of deposits from the membranes.…”

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confidence: 99%

“…As reported by Agarwal et al (2012), microbubbling is more efficient than chemical cleaning with NaOCl solution for the removal of extracellular polymeric matrix of biofilms. Furthermore, collapsing microbubbles have been shown to generate free radicals (Takahashi et al 2003;Agarwal et al 2012), which react rapidly and non-selectively with the chemicals in the water and cause their rapid degradation. The strong oxidation effects of free radicals will further degrade the recalcitrant compounds and will remove them from the water.…”

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confidence: 99%

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Wastewater Treatment and Reclamation: A Review of Pulp and Paper Industry Practices and Opportunities

Hubbe

Metts

Hermosilla

et al. 2016

BioRes

174

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The pulp and paper (P&P) industry worldwide has achieved substantial progress in treating both process water and wastewater, thus limiting the discharge of pollutants to receiving waters. This review covers a variety of wastewater treatment methods, which provide P&P companies with costeffective ways to limit the release of biological or chemical oxygen demand, toxicity, solids, color, and other indicators of pollutant load. Conventional wastewater treatment systems, often comprising primary clarification followed by activated sludge processes, have been widely implemented in the P&P industry. Higher levels of pollutant removal can be achieved by supplementary treatments, which can include anaerobic biological stages, advanced oxidation processes, bioreactors, and membrane filtration technologies. Improvements in the performance of wastewater treatment operations often can be achieved by effective measurement technologies and by strategic addition of agents including coagulants, flocculants, filter aids, and optimized fungal or bacterial cultures. In addition, P&P mills can implement upstream process changes, including dissolved-air-flotation (DAF) systems, filtration save-alls, and kidney-like operations to purify process waters, thus reducing the load of pollutants and the volume of effluent being discharged to end-of-pipe wastewater treatment plants. Keywords: Wastewater treatment; Pulp and paper manufacturing; Advanced oxidation; Membrane technologies; Clarification; Activated sludgeContact information: a: North Carolina State University, Dept. of Forest Biomaterials, Campus Box 8005, Raleigh, NC 29695-8005; b: WestRock Company, Water and Waste Treatment, 600 S 8th St, Fernandina Beach, FL 32034; c: Department of Agricultural and Forestry Engineering, University of Valladolid, Campus Duques de Soria, E-42004 Soria, Spain; d: Complutense University of Madrid, Department of Chemical Engineering, Ingn. Quim, Facultad de Ciencias Químicas, Ciudad Universitaria s/n,S-N, E-28040 Madrid, Spain; e: Concordia University, Dept. Bldg. Civil & Environm. Engn., 1455 Maisonneuve Blvd, West Montreal, PQ H3G 1M8, Canada; f: University of Jyväskylä, Dept. Chem., Box 35, FI-40014 Jyväskylä, Finland; g: Department of Biology, Center for Environmental and Marine Studies, CESAM, University of Aveiro, 3810-193 Aveiro, Portugal; h: Department of Environment and Planning, Center for Environmental and Marine Studies, CESAM, Aveiro & Department of Materials and Ceramics, Institute of Materials, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal; i: FPInnovations, 570 St. Jean Blvd., Pointe Claire, PQ H9R 3J9, Canada; * Corresponding author: hubbe@ncsu.edu Contents of the Article INTRODUCTIONThe pulp and paper (P&P) industry occupies a challenging position with respect to the natural environment. On the positive side, the industry is based on the usage of renewable, photosynthetic resources. On the other hand, the industry discharges huge quantities of aqueous effluents. Large volumes (up to 70 m 3 ) of wastewater ...

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Wastewater Treatment and Reclamation: A Review of Pulp and Paper Industry Practices and Opportunities

Hubbe

Metts

Hermosilla

et al. 2016

BioRes

174

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“…They can remain in an aqueous environment for longer times, however, if an ultrasound treatment is used to reduce their size [11]. An ultrasound pretreatment of aqueous sodium metasilicate to form SMC and reduce the bubble size does not decrease the eduction rate of aqueous sodium metasilicate and offers the possibility of sustained cleansing.…”

Section: Cleaning Methodsmentioning

confidence: 99%

Remediation Technology For Cesium Using Microbubbled Water Containing Sodium Silicate

Ueda

Tokuda

Gotô

2016

Radiological Issues for Fukushima’s Revitalized Future

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Remediation of materials contaminated with a radioactive material such as 137 Cs is important for public health and environmental concerns. Here, we report the effectiveness of aqueous sodium metasilicate (SMC) prepared using a microbubble crushing process for the removal of radioactive 137 Cs from contaminated materials. We have already reported that almost 80 % 137 Cs removal was achieved for a nonwoven cloth sample in which multiple washings using low SMC concentrations were effective. In addition, the volume of the waste solution can be reduced by neutralizing the SMC and using gelation to remove the radioactive material. We also attempt to clarify the mechanism of SMC operation by measuring its electrical properties. Decontamination is shown to be more efficient with SMC than with sodium hydroxide, even for washing granule conglomerates.

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“…[1], and extensively studied by mainly Japanese investigators, e.g., Kato et al [2], Ohnari et al [3], Takahashi et al [4], Unger et al [5], Terasaka et al [6], Tamura et al [7] together with us [8]- [10].…”

Section: Introductionmentioning

confidence: 99%

Purification of Deep Water in a Dam Lake Using Micro-Bubbles and/or Eco-Bio-Ring

Sadatomi¹,

Kawahara²,

Kurogawa³

et al. 2015

IJESD

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Abstract-This study is aiming at finding an efficient method to purify deep water in Midorikawa-dam Lake in Kumamoto Pref., Japan. The biological oxygen demand (BOD) of the water at first was 46 mg/L in the worst case. In the test, micro-bubbles were periodically supplied into the water in 80 L tank by a multi-fluids-mixer patented by Sadatomi and Kawahara. The bubbling rate were changed as Q G = 1.0 L/min and 2.0 L/min to study its effect. In addition, the Eco-Bio-Ring including aerobic bacteria (Bacillus bacterium), sold by Big Bio Co. Ltd., Japan, were immersed in two tanks of the three in order to study its effect. As a result, it was cleared that Q G = 1.0 L/min was enough to reduce the BOD to about 6-10 mg/L within two weeks, and the Eco-Bio-Ring was effective to reduce turbidity.Index Terms-Aerobic bacteria, lake, micro-bubble, water purification.

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Effect of Shrinking Microbubble on Gas Hydrate Formation

Cited by 202 publications

References 6 publications

Wastewater Treatment and Reclamation: A Review of Pulp and Paper Industry Practices and Opportunities

Wastewater Treatment and Reclamation: A Review of Pulp and Paper Industry Practices and Opportunities

Remediation Technology For Cesium Using Microbubbled Water Containing Sodium Silicate

Purification of Deep Water in a Dam Lake Using Micro-Bubbles and/or Eco-Bio-Ring

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