JPH0568967A - Waste water treatment device - Google Patents

Abstract

PURPOSE:To provide the title device enhanced in treatment capacity and capable of efficiently and stably treating waste water. CONSTITUTION:A waste water treatment device is equipped with a mixing tank 3 mixing waste water containing org. matter with powdery activated carbon to adsorb the org. matter on said powdery activated carbon and an activated carbon storage tank 7 storing a powdery activated carbon slurry to supply the same to the mixing tank 3 by an activated carbon injection pump 8. A hollow yarn membrane module 4 separating powdery activated carbon and treated water is connected to the mixing tank 3. The supply amount of the slurry supplied to the mixing tank 3 is adjusted by controlling the opening degree of a control valve 9 on the basis of the difference between the concn. signals of densitometers 6a, 6b by a control unit 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wastewater treatment apparatus for purifying wastewater containing organic substances such as surfactants.

[0002]

2. Description of the Related Art Conventionally, wastewater containing organic substances such as surfactants has been treated by a biological treatment apparatus utilizing an activated sludge method or a biofilm method. It is also considered to treat such wastewater with an activated carbon adsorption treatment device using granular activated carbon.

[0003]

However, in the biological treatment apparatus, there is a problem that a persistent substance such as a surfactant cannot be removed and foaming occurs. In addition, in an activated carbon adsorption device using granular activated carbon, there is a problem that the efficiency is poor because the adsorption action does not work sufficiently inside the activated carbon. Further, since the amount of activated carbon used in the activated carbon adsorption treatment device is substantially constant, there is also a problem that the quality of the treated water varies depending on the quality of the waste water.

The present invention has been made in view of the above points, and an object thereof is to provide a wastewater treatment apparatus capable of treating wastewater containing a surfactant and the like efficiently and stably. To do.

[0005]

The present invention provides a mixing tank for mixing waste water containing an organic substance and powdered activated carbon to adsorb the organic substance to the powdered activated carbon, a powdered activated carbon having the organic substance adsorbed and treated water. A membrane module to be separated, and an activated carbon supply tank for storing powdered activated carbon slurry and supplying the powdered activated carbon slurry to the mixing tank by an activated carbon injection pump, and a preparation valve attached to the outlet side of the activated carbon injection pump,
Concentration meters are attached to the waste water pipe to the mixing tank and the treated water pipe from the hollow fiber membrane module, and the valve opening of the preparation valve is controlled on these concentration meters based on the difference in concentration signal from each concentration meter. The waste water treatment device is characterized in that a control device is installed.

[0006]

When the difference between the concentration signals from the respective concentration meters is large, the valve opening of the preparation valve is opened to increase the amount of powdered activated carbon slurry supplied from the activated carbon supply tank to the mixing tank. On the other hand, when the difference between the concentration signals is small, the valve opening of the preparation valve is reduced to reduce the amount of powdered activated carbon slurry supplied from the activated carbon supply tank to the mixing tank.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing an embodiment of a wastewater treatment apparatus according to the present invention.

In FIG. 1, the wastewater treatment apparatus comprises a mixing tank 3 for mixing wastewater containing an organic substance and powdered activated carbon to adsorb the organic substance to the powdered activated carbon. The mixing tank 3 is divided into a mixing section 3a and a discharge section 3b by a partition wall 18,
A wastewater pipe 1 is connected to the mixing section 3a, and a stirrer 12 is installed in the mixing section 3a.

At the discharge part 3b of the mixing tank 3, the transfer pump 1
The hollow fiber membrane module 4 is connected via 7. The hollow fiber membrane module 4 has a hollow fiber membrane (not shown) inside, and powdered activated carbon is adhered to the hollow fiber membrane,
The treated water and the powdered activated carbon are separated. Further, the hollow fiber membrane module 4 is connected with a treated water pipe 5 for discharging treated water and a discharge pipe 16 for discharging the powdered activated carbon adhering to the hollow fiber membrane during cleaning.

On the other hand, a supply pipe 2 from an activated carbon supply tank 7 is connected to the mixing section 3a of the mixing tank 3. The activated carbon supply tank 7 stores activated carbon slurry therein, and an activated carbon supply pump 8 is provided in the supply pipe 2 on the outlet side of the activated carbon supply tank 7. The supply pipe 2 branches at a branch point 2a on the way, and this branch pipe serves as a return pipe 14 for the activated carbon supply tank 7
Has been returned to. The supply pipe 2 downstream of the branch point 2a
A preparation valve a is attached to. Further, a stirrer 11 is installed in the activated carbon supply tank 7.

The waste water pipe 1 to the mixing tank 3 and the treated water pipe 5 from the hollow fiber membrane module 4 are equipped with ultraviolet absorptiometers (UV meters) 6a and 6b, respectively. , 6b are connected to the control device 15. The controller 15 controls the adjusting valve 9 based on the difference between the concentration signals from the UV meter 6a and the concentration signals from the UV 6b.

Next, the operation of this embodiment having such a configuration will be described. First, wastewater containing an organic substance such as a surfactant, for example, wastewater containing a nonionic yarn surfactant as a main component, flows into the mixing section 3a of the mixing tank 3 from the wastewater pipe 1. At the same time, the powdered activated carbon slurry in the activated carbon supply tank 7
The activated carbon injection pump 8 passes through the supply pipe 2 and the mixing tank 3
Is supplied into the mixing section 3a. And in the mixing section 3a,
The waste water and the powdered activated carbon are mixed while being stirred by the stirring unit 12, and the powdered activated carbon adsorbs an organic substance such as a surfactant to treat the waste water. The powdered activated carbon slurry in the activated carbon supply tank 7 is constantly stirred by the stirrer 11.

Next, the powdered activated carbon having the surface active agent adsorbed in the mixing section 3a and the treated water flow into the discharge section 3b, and then are transferred into the hollow fiber membrane module 4 by the transfer pump 17. The powdered activated carbon supplied into the hollow fiber membrane module 4 adheres to the hollow fiber membrane, and the treated water is separated from the powdered activated carbon and discharged from the treated water pipe. In this case, the suspended matter in the treated water is also captured by the hollow fiber membrane, and the treated water is further purified.

During this period, the concentrations of the wastewater in the wastewater pipe 1 and the treated water in the treated water pipe 5 are detected by the UV meters 6a and 6b, and the concentration signals detected by the UV meters 6a and 6b are input to the controller 15. To be done. The control device 15 is U
Based on the difference between the concentration signals from the V meters 6a and 6b, when the difference between the concentration signals is large, the preparation valve 9 is opened to increase the supply amount of the powdered activated carbon slurry to the mixing tank 3. On the other hand, when the difference between the concentration signals is small, the preparation valve 9 is narrowed and a part of the activated carbon slurry supplied by the activated carbon injection pump 8 is returned to the return pipe 14
To the activated carbon supply tank 7. In this way, by adjusting the supply amount of the powdered activated carbon slurry to the mixing tank 3 to an appropriate value according to the treatment situation, efficient and stable wastewater treatment can be performed.

Next, when the wastewater treatment progresses and a large amount of powdered activated carbon adheres to the hollow fiber membranes in the hollow fiber membrane module 4, the inflow of the wastewater into the mixing tank 3 and the supply of the powdered activated carbon slurry are stopped. .. Subsequently, the inside of the hollow fiber membrane module 4 is washed by backwashing, the powdered activated carbon adhering to the hollow fiber membrane is separated from the hollow fiber membrane and discharged from the discharge pipe 16.

Thus, according to this embodiment, the mixing tank 3
In the mixing section 3a, since the powdered activated carbon adsorbs the surfactant in the waste water, it is possible to increase the treatment capacity per unit weight of the activated carbon as compared with the conventional device using the granular activated carbon. Wastewater treatment can be performed efficiently. Further, since the supply amount of the powdered activated carbon slurry supplied to the mixing tank 3 can be adjusted by the preparation valve 9 according to the processing situation, effective and stable treatment can be performed, and the consumption amount of the powdered activated carbon slurry can be reduced. You can keep it low.

Although the treatment of waste water containing a surfactant has been described in the above embodiments, it is also possible to treat waste water containing other organic pollutants. Further, although an example using a hollow fiber membrane module having a hollow fiber membrane is shown, a flat membrane module having a flat membrane or a tubular membrane module having a tubular membrane may be used instead of the hollow fiber membrane module.

[0018]

As described above, according to the present invention,
Since organic substances in the wastewater are adsorbed by the powdered activated carbon in the mixing tank, the treatment capacity per unit weight of activated carbon can be increased as compared with the conventional device using granular activated carbon, and the wastewater treatment can be performed efficiently. Can be done. Further, since the amount of the powdered activated carbon slurry supplied to the mixing tank can be adjusted by the adjusting valve according to the processing situation, effective and stable processing can be performed. Furthermore, since other pollutants are reliably separated from the treated water by the hollow fiber membrane module in the mixing tank, clean treated water can be obtained.

[Brief description of drawings]

FIG. 1 is a schematic view showing an embodiment of a wastewater device according to the present invention.

[Explanation of symbols]

 1 Waste Water Pipe 2 Supply Pipe 3 Mixing Tank 4 Hollow Fiber Membrane Module 5 Treated Water Pipe 6a UV Meter 6b UV Meter 7 Activated Carbon Supply Tank 8 Activated Carbon Injection Pump 9 Preparation Valve 15 Control Device

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁵ Identification code Office reference number FI Technical display location C02F 1/58 CCP C 7158-4D 9/00 Z 6647-4D

Claims (1)

[Claims] 1. A mixing tank for mixing waste water containing an organic substance and powdered activated carbon to adsorb the organic substance to the powdered activated carbon, a membrane module for separating the powdered activated carbon having the organic substance adsorbed from the treated water, and the powdered activated carbon. The mixing tank is equipped with an activated carbon supply tank for supplying powdered activated carbon slurry to the mixing tank by an activated carbon injection pump, a preparation valve is attached to the outlet side of the activated carbon injection pump, a waste water pipe to the mixing tank and the hollow fiber A densitometer is attached to each of the treated water pipes from the membrane module, and a controller for controlling the valve opening of the preparation valve based on the difference in concentration signals from the densitometers is connected to these densitometers. Wastewater treatment equipment.