Liquid purification or separation – Automatic control
Reexamination Certificate
2000-02-25
2001-10-16
Drodge, Joseph W. (Department: 1723)
Liquid purification or separation
Automatic control
C210S097000, C210S614000, C706S021000, C706S023000
Reexamination Certificate
active
06303027
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a treated water quality control system for controlling the quality of treated water obtained by treating sewage by a sewage treatment plant.
BACKGROUND ART
For example, when controlling the flow rate of aeration air supplied to an aeration tank to promote biological reaction in a sewage treatment plant provided with a biological reaction tank, a flow rate control method controls the flow rate of aeration air in proportion to the inflow of sewage. However, reaction rate is dependent on the quality of water and hence the feed forward flow rate control method is unable to control the flow rate properly and to reduce the cost.
In another treatment process, such as a returned sludge quantity control, processes are controlled individually. However, the control of the general operation of the sewage treatment plant for the stabilization of water quality and the reduction of processing costs has not been conducted.
The improvement of the quality of treated water (observation of standards) is desired for the maintenance of environmental water condition. However, the currently used control method requires much water disposal costs and it has been desired to control water quality capable of reducing treatment costs, maintaining satisfactory water quality. The general operation and control of a water sewage treatment plant have been desired.
However, as mentioned previously, any control for stabilizing water quality and reducing treatment costs has not been achieved.
DISCLOSURE OF THE INVENTION
The present invention has been made in view of such problems and it is therefore an object of the present invention to provide a treated water quality control system for controlling the quality of treated water capable of stabilizing the quality of treated water and of reducing treatment costs.
According to the present invention, a treated water quality control system for controlling the quality of treated water obtained by treating sewage by a sewage treatment plant comprises: a sewage inflow estimating unit for estimating an inflow of sewage; a process data storage unit for storing process data on the sewage treatment plant; a process controller for controlling devices included in the sewage treatment plant; a manipulated variable calculating unit for calculating manipulated variables for controlling the process controller on the basis of the inflow of sewage estimated by the sewage inflow estimating unit and the process data read from the process data storage unit; and a process condition estimating arithmetic unit for estimating the conditions of the sewage treatment plant on the basis of the process data read from the process data storage unit and for making the manipulated variable calculating unit update the calculated manipulated variables and determine optimum values of manipulated variables.
According to the present invention, a treated water quality control system for controlling quality of treated water obtained by treating sewage by a sewage treatment plant comprises: a sewage inflow estimating unit for estimating an inflow of sewage; a process data storage unit for storing process data on the sewage treatment plant; an operation result data storage unit for storing operation result data of past operations of the sewage treatment plant; a process controller for controlling devices included in the sewage treatment plant; a day condition input unit for inputting conditions of weather and atmospheric temperature of the day; an analogous operating condition data retrieving unit for retrieving operation result data on a past analogous operating day on the basis of the inflow of the sewage estimated by the sewage inflow estimating unit, the conditions of weather and atmospheric temperature of the day provided by the day condition input unit and the operation result data of the past operations provided by the operation result data storage unit; and a process condition estimating arithmetic unit for estimating process conditions of the sewage treatment plant on the basis of the operation result data on the past analogous day provided by the analogous operating condition retrieving unit and the process data read from the process data storage unit.
According to the present invention, a treated water quality control system for controlling the quality of treated water obtained by treating sewage by a sewage treatment plant comprises: a sewage inflow estimating unit for estimating an inflow of sewage; a process data storage unit for storing process data on the sewage treatment plant; an operation result data storage unit for storing operation result data of past operations of the sewage treatment plant; a process controller for controlling devices included in the sewage treatment plant; an operating condition specifying unit for specifying operating conditions on an optionally set day on the basis of the operation result data read from the operation result data storage unit; and a process condition estimating arithmetic unit for estimating process conditions of the sewage treatment plant on the basis of the operating conditions for the set day specified by the operation data specifying unit and the process data read from the process data storage unit.
The present invention stabilizes the quality of treated water with reliability.
REFERENCES:
patent: 5547578 (1996-08-01), Nielsen
patent: 5589068 (1996-12-01), Nielsen
patent: 5774633 (1998-06-01), Baba et al.
patent: 5852817 (1998-12-01), Kano
Publication Article “Micro-controller System for Water and Sewage Works”, published in Fuji Electric Rev., vol. 24, NOI. 1 , 1978 by Yuki Ito , NOboru Satake, MichinosukeKono and Narumi Ibe, 1978.
Hatsushika Yukio
Horie Kazuhiro
Kunimi Masaki
Nagaiwa Akihiro
Nagamori Yasuhiko
Drodge Joseph W.
Kabushiki Kaisha Toshiba
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
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