Title:
BILOGICAL TREATMENT DEVICE
Document Type and Number:
Japanese Patent JP3870445
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To eliminate the necessity of an equipment and a chemical agent for removing calcium and reduce the amount of use of the chemical agent for preventing scale troubles by computing the target pH of a nitration tank based on the measurement of the M-alkaline strength and the Ca concentration in a nitration tank and adjusting pH in the nitration tank based on the computed result.
SOLUTION: The Ca concentration and the M-alkaline strength in a nitration tank 1 is measured by a Ca concentration and M-alkaline strength analysis device 12. The measurement result of the analysis device 12 and the measurement result of a pH meter are input into a computation controller 13, and the computation is performed in compliance with a computation formula based on the above measurement values, and pH in the nitration tank 1 is controlled based on the computation result. The scale troubles in a system can be prevented by the arrangement. An equipment for removing calcium, therefore, is not necessary, and a device can be smaller in size. Also a chemical agent for removing calcium is not necessary to reduce the chemical agent cost. The formula is that the supersaturation = nitration tank target pH-[1.99-(log(Ca concentration/40/1000)+log(M-alkaline strength/100/1000)}].
Inventors:
Atsushi Watanabe
Hotozawa Shin
Hotozawa Shin
Application Number:
JP13840996A
Publication Date:
January 17, 2007
Filing Date:
May 31, 1996
Export Citation:
Assignee:
Kurita Water Industries Ltd.
International Classes:
C02F3/34; (IPC1-7): C02F3/34; C02F3/34
Domestic Patent References:
| JP5123696A | ||||
| JP63315198A | ||||
| JP7185590A | ||||
| JP61220793A | ||||
| JP2198696A |
Attorney, Agent or Firm:
Tsuyoshi Shigeno
Previous Patent: WASTE LIQUID RECOVERING DEVICE FOR INK JET TYPE PRINTER
Next Patent: PRODUCTION OF ITO SINTERED BODY AND SPUTTERING TARGET
Next Patent: PRODUCTION OF ITO SINTERED BODY AND SPUTTERING TARGET