Maezawa Industries Inc.

Naka, Japan

Maezawa Industries Inc.

Naka, Japan
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Mochizuki M.,University of Shizuoka | Inoue T.,University of Shizuoka | Yamanishi K.,University of Shizuoka | Koike S.,University of Shizuoka | And 3 more authors.
Dalton Transactions | Year: 2014

Reaction of CuSO4·5H2O with 1,3-bis(benzimidazol-1-ylmethyl)-2,4,6-trimethylbenzene (m-bbitrb) provides a new positively charged M2L4 type molecule, [SO4⊂Cu2(m-bbitrb)4]SO4. This compound includes SO4 2- inside and outside the cationic cage. Despite this compound being insoluble in water, it shows highly efficient perchlorate removal activity from water by the exchange with SO4 2- outside the cage. © 2014 The Royal Society of Chemistry.

Yamaguchi M.,University of Shizuoka | Hirakawa T.,University of Shizuoka | Nishina N.,University of Shizuoka | Kondo M.,University of Shizuoka | And 3 more authors.
Chemistry Letters | Year: 2010

A self-assembled Cu-bitb molecular capsule system using basic copper(II) carbonate as a Cu 2+ source removed Perchlorate and tetrafluoroborate anions from aqueous solutions without contamination by Cu(II) ion. © 2010 The Chemical Society of Japan.

Chen X.,Ehime University | Fujiwara T.,Ehime University | Ohtoshi K.,Kochi University | Inamori S.,Tsurumi Manufacturing Co. | And 2 more authors.
Water Science and Technology | Year: 2010

A novel oxidation ditch system using anaerobic tanks and innovative dual dissolved oxygen (DO) control technology is proposed for biological nitrogen and phosphorus removal from domestic sewage. A continuous bench-scale experiment running for more than 300 days was performed to evaluate the system. Monitoring and controlling the airflow and recirculation flow rate independently using DO values at two points along the ditch permitted maintenance of aerobic and anoxic zone ratios of around 0.30 and 0.50, respectively. The ability to optimize aerobic and anoxic zone ratios using the dual DO control technology meant that a total nitrogen removal efficiency of 83.2-92.9% could be maintained. This remarkable nitrogen removal performance minimized the nitrate recycle to anaerobic tanks inhibiting the phosphorus release. Hence, the total phosphorus removal efficiency was also improved and ranged within 72.6-88.0%. These results demonstrated that stabilization of the aerobic and anoxic zone ratio by dual DO control technology not only resulted in a marked improvement of nitrogen removal, but it also enhanced phosphorus removal. © IWA Publishing 2010.

Chen X.,Ehime University | Fujiwara T.,Kochi University | Nakamachi K.,Maezawa Industries Inc. | Kawaguchi Y.,Japan Sewage Works Agency | And 2 more authors.
Desalination | Year: 2012

A novel pilot-scale oxidation ditch (OD) system with an anaerobic tank and dual dissolved oxygen (DO) control technology was used to treat raw domestic wastewater during 310. days of operation. Three intensive sampling sessions indicated that the dual DO control technology could create stable aerobic and anoxic zones along the main ditch, even with large influent fluctuations. Dramatic total nitrogen (TN), total COD, and total phosphorus removal efficiencies were achieved within ranges of 78-90%, 83-91%, and 69-82%, respectively. June nitrogen balance results revealed that 60% of influent TN was denitrified and that 92% denitrification occurred in the main OD, demonstrating the advantage of the dual DO controls. In addition, COD balance values showed that 67% of the mineralized COD was due to denitrification, and aerobic oxidation was minimized. With lower influent BOD/N ratios of 4.0-4.7, significant TN removal performances were obtained in this OD system. Maximizing COD for denitrification and minimizing aerobic degradation suggest that this novel OD system shows promise for highly effective sewage treatment with effective COD consumption. © 2011.

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