Fujisawa, Japan
Fujisawa, Japan

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Shimamura K.,Swing Corporation | Kurosawa T.,Swing Corporation
Water Practice and Technology | Year: 2011

A novel phosphorus recovery process enabling an effective reuse of recovered phosphorus as a resource has been developed. Three processes, which match the characteristics (sewage component, concentration and flow rate, etc.) of the waste water or the sludge generated form sewage treatment, are introduced here. Verification tests carried out using a crystallization of magnesium ammonium phosphate revealed a phosphorus crystallization exceeding 85%. Moreover, these tests show that the recovered phosphorus can be reused as a fertilizer. Another verification test carried out using a crystallization of hydroxylapatite revealed that the phosphorus concentration is reduced to a few milligrams per liter. In addition it is found that the recovered hydroxylapatite can be reused as a phosphorus ore. Each of the three processes is revealed to contribute to prevention of water contamination, as well as the recovery of phosphorus as a resource. © IWA Publishing 2011.

Louchev O.A.,RIKEN | Hatano H.,Japan National Institute of Materials Science | Hatano H.,SWING Ltd. | Tsukihana T.,RIKEN | And 5 more authors.
Optics Express | Year: 2015

We report experimental results of second-harmonic (SH) generation (SHG) by a quasi-phase-matched periodically poled Mg-doped stoichiometric LiTaO3 crystal for 1030 nm input radiation of 18 ps pulse duration, within the range of peak input laser intensity I = 0.1-9.5 GW/cm2 and under repetition rate 10-20 kHz. For I>3 GW/cm2 SHG efficiency achieves the saturation level of η≈0.35 which can be maintained within a wide range of I = 3-9.5 GW/cm2. The loss of SHG efficiency observed for I>5 GW/cm2 can be recovered to the level of η≈0.35 by using temperature-controlled operation. By applying our experimental data we find the value of two-photon absorption (TPA) coefficient for 515 nm radiation, β≈1.1-2.7 cm/GW, agreeing well with the theoretical estimate β≈2.6 cm/GW. Our analysis suggests that the inhibition of SHG efficiency, its saturation and stabilization are due to a combined mechanism including: (i) non-steady-state ps effect scaled by ≈ζ-2[1-exp(-ζ)]2 as compared with the efficiency for ns pulsed operation (ζ = L/V2τP, L is the crystal length, τP is the pulse duration and V2 is the group velocity of SH); (ii) dephasing caused by the spectral bandwidth of the input radiation (≈300 GHz); (iii) thermal dephasing caused by TPA of SH; and (iv) strong SH attenuation by TPA of order ≈I2 -1 dI2/dz≈-(0.8-8) cm-1 for I = 1-9.5 GW/cm2. © 2015 Optical Society of America.

Miyoshi T.,Kobe University | Hayashi M.,Swing Corporation | Shimamura K.,Swing Corporation | Matsuyama H.,Kobe University
Desalination | Year: 2016

In this study, we investigated the organic matter responsible for reverse osmosis (RO) membrane fouling in seawater desalination. In addition, pretreatments by which fouling organic fractions causing severe membrane fouling can be removed effectively were investigated. The results from continuous operation of a pilot-scale sand filter indicated that the changes in the concentrations of specific organic fractions, such as transparent exopolymer particles (TEP) and biopolymers determined by liquid chromatography with organic carbon detection (LC-OCD), cannot be evaluated by comprehensive water quality indices (e.g., total organic carbon (TOC) or dissolved organic carbon (DOC) concentrations). In addition, the changes in the degree of membrane fouling cannot be explained by the comprehensive TOC and DOC concentrations. Among the water quality indices examined in this study, the concentration of TEP with relatively large particle size (i.e., >. 1.0 μm) and content of protein-like organic matter that can be detected by fluorescence excitation-emission matrix (EEM) spectral analysis were well correlated to RO membrane fouling levels. The results obtained in this study strongly suggest that developing a pretreatment method that can effectively eliminate TEP and proteinaceous compounds contained in seawater is important for the stable operation of a seawater desalination plant utilizing an RO membrane. © 2016 Elsevier B.V.

Ikeda-Ohtsubo W.,Tohoku Gakuin University | Miyahara M.,University of Tokyo | Yamada T.,Tohoku Gakuin University | Yamada T.,Toyohashi University of Technology | And 6 more authors.
Journal of Bioscience and Bioengineering | Year: 2013

Bioaugmentation of bioreactor systems with pre-cultured bacteria has proven difficult because inoculated bacteria are easily eliminated by predatory eukaryotic-microorganisms. Here, we demonstrated an intermediate thermal treatment was effective for protecting introduced denitrifying bacteria from eukaryotic predators and consequently allowed the inoculated bacteria to survive longer in a denitrification reactor. © 2013 The Society for Biotechnology, Japan.

Swing Corporation | Date: 2015-03-17

It is an object of the present invention to provide an electrical deionization apparatus having a novel constitution with excellent deionization efficiency. As means for solving this problem, according to one embodiment of the present invention, there is provided an electrical deionization apparatus having deionization compartments, concentration compartments and electrode compartments partitioned from one another by a plurality of ion exchange membranes between a cathode and an anode, wherein, in the deionization compartments and/or the concentration compartments and/or the electrode compartments, at least one of anion exchange fibrous material layers and cation exchange fibrous material layers are disposed on one another intersecting a water-passing direction.

Ebara Industrial Cleaning Co. and Swing Corporation | Date: 2013-06-05

A decontamination method for solid material contaminated by radiocesium, comprising bringing the solid-state material containing radiocesium into contact with a first processing solution and preferably eluting cesium ion from the solid-state material to the liquid phase in the presence of potassium ion or ammonium ion.

Provided is a technique which makes it possible to recover fine MAP particles which cannot be separated by a physical means such as a liquid cyclone so as to significantly improve a phosphorus recovery ratio from sludge. Proposed is a method for treating organic waste water or organic sludge including a phosphorus separation step in which by using MAP particles contained in anaerobically treated sludge obtained by anaerobically treating organic waste water or organic sludge as seed crystals, the MAP particles are grown by crystallizing and precipitating, as MAP, a phosphorus component dissolved in solid-liquid separation water returned from the subsequent sludge amount reduction step, followed by separation into the grown MAP particles and MAP depleted sludge, a pH adjustment step in which the pH of the MAP depleted sludge obtained by the separation in the phosphorus separation step is lowered to dissolve the MAP particles remaining in the MAP depleted sludge, thereby obtaining pH-adjusted sludge, and a sludge amount reduction step in which dewatered cake is obtained by concentrating and dewatering the pH-adjusted sludge and a part or the whole of solid-liquid separation water obtained by the concentration and dewatering is returned to the phosphorus separation step.

Swing Corporation | Date: 2013-02-20

It relates to a treatment of oil-containing waste water using a membrane biological reactor membrane biological reactor biological reactor (MBR), and it is to provide a new treatment apparatus which is capable of suppressing a reduction in biological treatment activity and suppressing an effect on a separation membrane. Provided is a membrane biological reactor having a biological reaction chamber and a membrane separation chamber, in which the it has a configuration that, within the biological reaction chamber, at least one partition is installed to have a first reaction chamber, a second reaction chamber, and if necessary, an additional reaction chamber so as to form an upflow and downflow flow path, an aeration device and a scum/oil skimmer are installed at least in the first reaction chamber, and a mixture liquid containing activated sludge is withdrawn from the membrane separation chamber and distributed and returned at least to the first reaction chamber and the second reaction chamber.

Swing Corporation and Ebara Industrial Cleaning Co. | Date: 2012-11-07

A decontamination method of solid-state material contaminated by radiocesium comprising bringing the solid-state material containing radiocesium in contact with a first processing solution and preferably eluting cesium ion from the solid-state material to the liquid phase under the presence of potassium ion or ammonium ion.

PubMed | Swing Corporation
Type: Journal Article | Journal: Water science and technology : a journal of the International Association on Water Pollution Research | Year: 2011

For on-site copper recovery in print circuit board factories, we propose a novel technology to obtain cupric oxide with a low content ratio of chloride from high chloride concentration waste, such as cupric chloride etchant waste. Our technology is designed to avoid formation of double salt and accumulation of cupric hydroxide. In the proposed method, etchant waste mixed with hydrogen peroxide solution is added to sodium hydroxide solution by stepwise addition. We performed lab-scale experiments on the influence of reaction pH conditions on the content ratio of chloride in recovering cupric oxide. The results show that recycled cupric oxide tends to contain a lower content ratio of chloride under higher starting temperatures and higher final pH conditions of the reaction. We also confirmed the optimized conditions; the starting temperature of the sodium hydroxide solution is higher than 70 degrees C, and the final pH of the reaction is 11.5 to 12. Based on the optimized temperature and pH conditions, we also performed a pilot trial to recover cupric oxide from real etchant waste. Then, we successfully obtained cupric oxide with a content ratio of chloride in 80 mg-Cl/kg-CuO.

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