JPH01194986A - Automatic control equipment for waste water treatment - Google Patents

Abstract

PURPOSE:To make a pollution level of discharged waste water easily controllable by opening or closing valves according to output signals from a COD indicating controller and driving a discharge pump according to output signals from a water level controller. CONSTITUTION:An original waste water is allowed to flow through either a waste water treatment equipment 22 or a bypass pipe 24 by opening valves 25 or 26 respectively. Effluents from the equipment 22 and the bypass pipe 24 are mixed and stored in a discharge tank 23 and the mixed water in the discharge tank 23 is discharged by a discharge pump 30. The valves 25 and 26 are driven by output signals from a meter 31 measuring a pollution level of the aforementioned mixed water, and the discharge pump 30 is driven by output signals from a meter 32 measuring a water level of the discharge tank 23. It is possible, as a result, to control easily the pollution level of discharged waste water.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an automatic control device for wastewater treatment for controlling the quality of effluent water by intermittently operating a wastewater treatment device.

(Prior Art) Equipment such as coagulation-sedimentation treatment, activated sludge treatment, filtration treatment, and activated carbon adsorption treatment is installed in order to improve the water quality of factory waste water to a certain standard before discharging it. For example, JP-A-60
In Japanese Patent No. 139306, the degree of contamination of the waste liquid passed through a filter is inspected to manage the waste liquid. In this case, the water quality of the discharged liquid fluctuates due to a decrease in the processing capacity of the filter, fluctuations in the quality of inflow water, fluctuations in water temperature, etc. The system disclosed in Utility Model Application No. 160984/1984 inspects the degree of contamination of raw waste water, treated water from an activated carbon adsorption tower, and combined water, and uses a computer (
It attempts to perform centralized management using the CPU. To explain this with reference to Fig. 3, the arrangement of each device is that piping is piped from the raw water tank 1 to the adsorption treatment tower 2, and the adsorption treatment tower 2 is connected to a bypass pipe 3, which drains the raw water (effluent). A pump 4 and an on-off valve 56 are provided at the outlet of the raw water tank 1. Each outlet has a COD meter 7 for measuring chemical oxygen demand (COD). 8. 9 is arranged, and is sent to the CPU 10, which controls the bomb and on-off valve 5.6 based on the calculation result.

11 is an inverter that operates the pump, and 12.13 is a flow meter.

(Problems to be Solved by the Invention) However, the above device measures the COD at each location of the waste liquid sent out from the pump 4 and operates the pump 4 and the on-off valves 5 and 6 based on the data. The configuration of the device is complicated due to the large number of parts. The work for this is difficult and the equipment costs are considerable.

The present invention provides an automatic wastewater treatment control device for easily managing the degree of contamination of discharged wastewater. The purpose is to

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a valve that allows waste raw water to flow through either the activated carbon adsorption tower 22 or the bypass pipe 24 that bypasses the activated carbon adsorption tower 22. 25.26
, a discharge water tank 23 that mixes and stores the waste liquid from the activated carbon adsorption tower 22 and the bypass pipe 24, and a pump 30 that discharges the mixed water in the discharge water tank, and a COD indicator that measures the COD concentration of the mixed water. Valve 2 is activated by the output signal of controller 31.
5.26 are operated alternately, and the pump is operated by the output signal of the water level controller 32 which measures the water level of the discharge water tank 23.

(Function) The mixed water in the discharge water tank 23 is measured by the COD indicator controller 31, and when the water quality exceeds the water quality standard value for discharge, the valve 26 is closed and the valve 25 is opened to discharge the water to the activated carbon adsorption tower 22. Drain liquid raw water. Further, if the measured value is lower than the reference value, the valve 26 is opened, the valve 25 is closed, and the drained liquid is passed through the bypass pipe 24VC. The mixed water stored in this way filled the discharge tank.

Sometimes the pump 30 is opened to release water. At this time, COD
Valve control by the indicating controller has stopped.

(Example) An example of the present invention will be described based on FIGS. 1 and 2. In the figure, 20 is a raw water tank, and a pump 21 is provided at the outlet. From here, it is separated into a flow path passing through the activated carbon adsorption tower 22 to the effluent water tank 23 and a flow path going through the bypass pipe 24 to the effluent water tank 23, and a valve 25 (V , ), 2 s (y, ) are provided.

At the bottom of the discharge water tank 23, an air pipe 2 is connected from the stirring prower 27.
A diffuser pipe 29 is attached to which air is supplied through the air pipe 8,
A pump 30 is attached to the outlet. Further, the treated water discharged from the activated carbon adsorption tower 22 and the waste liquid sent out from the bypass pipe 24 are piped so as to flow into the discharge water tank 23 from several locations. 31 is a COD indicator controller that measures the mixed water in the discharge water tank 23, and operates the valve 25 (V,) or valve 26 (V,) based on this measurement signal. 3
Reference numeral 2 denotes a water level controller for the mixed water, which outputs a signal to operate the pump 30 when the water level in the discharge water tank 23 reaches its maximum level. In the figure, dotted lines are signal lines.

In the figure, the activated carbon adsorption tower 22 uses an upward flow multi-stage fluidized bed type, in which activated carbon is introduced from the top of the adsorption tower and a fluidized bed 34 is formed on several trays 33. The coal gradually falls to the bottom, and is discharged from the bottom as waste coal to the outside of the tower. On the other hand, the wastewater flows from the bottom to the top, and the COD components in the wastewater are adsorbed by activated carbon and are sent out from the top as treated water. Note that 35°36 is a COD indicating controller.

Next, the operation will be explained with reference to FIG.

The raw water pump 21 is operated, activated carbon is supplied to the activated carbon adsorption tower 22, and the waste liquid is caused to flow, and at the same time, the stirring blower is operated. At this time, the valve 26 communicating with the bypass pipe 24 is closed (steps 40 to 43). Then, in step 44, the raw water COD concentration concentration and the Co-based activated carbon adsorption tower treated water concentration are measured.
~49), The valve 25 is opened until the activated carbon adsorption tower treated water concentration Ct becomes smaller than the effluent COD reference value Ces (steps 53, 54, and 55). If raw water CO
When the D concentration Co is smaller than the effluent COD reference value Ces, the valve 25 (V,) is closed and the valve 26 (V2) is opened to bypass the water (steps 50, 5], 52).

Next, measure the water level of the discharge water tank 23 (step (5)
6-59). When the water level of the mixed water rises to a low water level and reaches WL, the supply of activated carbon is stopped and the drained liquid from the bypass flows in (steps 60 to 61). Then, the COD concentration Ce of the mixed water is measured (steps 64 and 65), and if it is within the reference value, the state is maintained (step 62). Further, when the value exceeds the reference value, an alarm is issued and the inflow from the bypass is stopped and the inflow from the activated carbon adsorption tower 22 is performed (steps 66 to 68). This lowers the 9COD concentration Ce. Then, the water level controller 32 indicates the high water level H, WL.
When the pump 30 instructs and detects that the mixed water is full, the pump 30 is activated to discharge the mixed water, and when the water reaches the lowest water levels LL and WL, the pump is stopped (step 69.70). Thereafter, the activated carbon treatment tower is adjusted for a certain period of time (step 71, steps 44-49).

Repeat the above actions.

Furthermore, if the valves 25 and 26 are operated frequently,
Care must be taken because the activated carbon in the activated carbon adsorption tower of this device may fall more than expected. Therefore, set the state maintenance time.

When setting the adjustment points for the COD indicating controller and water level controller, care should be taken to ensure that the valves are not opened and closed too frequently.

Further, the activated carbon adsorption tower can be of a downward flow fixed bed type, and in this case, no activated carbon supply is required, which further simplifies the operation. In this device, when the waste liquid passes through the bypass, the waste liquid does not flow into the column, so even if the supply of activated carbon is stopped, the adsorption capacity is maintained, so there is no wasted supply.

In addition, the inside of the discharge water tank 23 is made uniform by the force of the inflow of treated water and waste water from the bypass pipe and the foaming from the air diffuser pipe 29, so that the COD concentration Ce can be measured stably, and the discharge water The COD reference value can be designed arbitrarily.

(Effect of the invention) Since the present invention is configured as described above, CO
Control is simple because the valves are simply opened and closed according to the instructions from the D indicator controller and water level controller, and stable discharge water quality can be obtained at any water quality level. In addition, during bypass water flow, activated carbon supply is not required, which reduces treatment costs and saves equipment costs.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a flowchart of the present invention, and FIG. 3 is a block diagram of conventional wastewater treatment. 22...Activated carbon adsorption tower 23...Discharge water tank 24...Bypass pipe 25.26...Valve 30...
Pump 31...COD indicating controller 32...Water level controller Patent applicant Toyota Motor Corporation Figure 1 22. Activity f! Adsorption tower 23 Effluent water tank 31 -, cooti display v/4 section word soil 32
Water level controller Figure 3 1n

Claims (1)

[Claims] (1) A valve that allows wastewater raw water to flow through either the wastewater treatment device or a bypass pipe that bypasses the wastewater treatment device, and mixes and stores the wastewater from the wastewater treatment device and the bypass pipe. An instrument comprising a discharge tank and a discharge means for discharging the mixed water in the discharge tank, the valve is actuated by an output signal of the meter for measuring the degree of contamination of the mixed water, and the water level of the discharge tank is measured. An automatic control device for wastewater treatment, characterized in that a discharge means is actuated by an output signal.