JPS62234597A - Device for flocculating sludge in water treatment - Google Patents

Abstract

PURPOSE:To automatically control amount of a flocculating agent to be added into sludge in water treatment by detecting rotary torque in flocculated floc and controlling the amount of the flocculating agent to be added so that the rotary torque is regulated to preferable value. CONSTITUTION:In such a device that a flocculating agent (f) is mixed to sludge (s) in water treatment and it is flocculated, rotary torque is detected by rotating a rotary member 12 in flocculated floc produced by mixing of the flocculating agent in a rotary torque detection part consisting of flocculating floc tank 11 and a torque meter 13 or the like. Then in a controller 10, the detection value of rotary torque is changed into evaluation value. Further in a standard setting means 14, kind of sludge in water treatment, kind of the flocculating agent, and kind of a dehydrator 9 are considered, and selected evaluation standard is inputted to the controller 10. In the controller 10, evaluation data and preset standard are compared and the number of revolutions of a feed pump 6 for the flocculating agent is controlled based on the comparison result. In such a way, amount of the flocculating agent to be added is automatically controlled and preferable flocculated floc can be formed.

Description

Detailed Description of the Invention 3. Field of Industrial Application of the Invention The present invention relates to a water treatment sludge flocculating device, and more specifically, the present invention relates to a water treatment sludge flocculating device, and more specifically, it relates to a water treatment sludge flocculating device with a suitable amount of flocculant added. It relates to a device for mixing and aggregating.

Prior art and its problems Inorganic or organic flocculants are mixed into water treatment sludge as a dehydration aid, but adding a large amount of flocculant not only increases operating costs, but also It is necessary to adjust the amount of addition to an appropriate amount because it causes deterioration of agglomeration, and if it is reduced, the necessary aggregation effect cannot be obtained.

Therefore, various methods have been used to appropriately control the amount of coagulant added.

For example, in Japanese Patent Publication No. 59-53120, the particle size distribution of coagulated flocs was measured by sampling water treatment sludge mixed with a flocculant and passing it through a multistage sieve net with different mesh sizes. A method is disclosed in which the amount of flocculant added is adjusted so that the diameter distribution meets a predetermined standard.

However, this method has problems in that it is complicated to operate, takes time to obtain results, and cannot be incorporated into a flocculating device and used to automatically control the amount of flocculant added.

In addition, as other related techniques, there are techniques disclosed in, for example, Japanese Patent Laid-Open Nos. 59-183898 and 60-25598.

OBJECTS OF THE INVENTION It is an object of the present invention to provide a water treatment sludge flocculation device that automatically controls the amount of flocculant added to water treatment sludge.

Structure of the Invention The water treatment sludge flocculating apparatus of the present invention is an apparatus for mixing a flocculant into water treatment sludge to flocculate the water treatment sludge. The configuration includes a rotational torque detection section for detecting rotational torque, an evaluation section for obtaining evaluation data from the detected rotational torque, and an addition amount joint section for increasing or decreasing the amount of flocculant added in the direction of making the evaluation data match a set standard. This is the characteristic of

In the above configuration, the "evaluation data" is a parameterization of rotational torque into a numerical value that can be easily compared with a set standard. If the detected rotational torque can be compared as it is, it can be used as evaluation data as is. The evaluation data may be expressed as a digital quantity or as an analog quantity.

When a flocculant is mixed with working water treated sludge, flocs are formed within about one minute. The flocculation state of the flocs depends on the type of water treatment sludge, the amount of flocculant added, etc., and the viscosity of the flocs depends on the condition.

On the other hand, the preferable state of coagulated flocs suitable for increasing treatment efficiency is determined by the type of water treatment sludge, the method of dewatering treatment, etc. Once the preferred state is determined, the preferred viscosity is also determined.

In the present invention, the rotational torque in the coagulated flocs is detected, and the amount of coagulant added is adjusted so that the rotational torque becomes a preferable value. Since the rotational torque is determined by the viscosity of the coagulated flocs,
In other words, this means adjusting the amount of flocculant added so as to obtain a preferable viscosity, and more specifically, it is nothing but adjusting the amount of flocculant added so as to obtain a preferable agglomerated state.

Therefore, agglomerated flocs in a preferable state can be formed at all times, and high treatment efficiency can be obtained in the subsequent sludge treatment.

The present invention will now be described in more detail based on embodiments shown in the figures. Here, FIG. 1 is a block diagram of a water treatment sludge flocculating apparatus according to one embodiment of the present invention, and FIG. 2 is a block diagram of another embodiment. Note that the present invention is not limited to the embodiments shown in the figures.

In a water treatment sludge flocculating apparatus t not shown in FIG.

On the other hand, the flocculant f stored in the flocculant storage J15 is sent to the flocculant mixing tank 4 by the flocculant supply pump 6. 8 is a flow meter.

The water treatment lη mud S and flocculant f are mixed in the flocculation mixing tank 4.
The mixture is stirred and mixed by the agitator 7 in the coagulated fi mixing tank.

The flocs produced here are sent to the dehydrator 9 by gravity. This dehydrator 9 is, for example, a belt press dehydrator.

The flocs sent out from the flocculation mixing tank 4 pass through the flocculation tank 11 and flow downstream to the dehydrator 9.

In the coagulation floc tank 11, the rotor 1 of the torque meter 13
2 is constantly rotating, and the torque meter 13 detects the viscosity, which changes depending on the state of agglomeration of the flocs, as rotational torque.

The detected rotational torque value output from the torque meter 13 is input to the control device 10.

The control device 10 converts the detected value of the rotational torque into evaluation data by multiplying it by a predetermined coefficient, for example.

Reference numeral 14 denotes a standard setting means for setting evaluation standards for coagulated flocs, including the type of water treatment sludge S and the f! of the flocculant f! i
The evaluation criteria selected in consideration of the type, type of dehydrator 9, etc. are input to the control device 10.

The control device 10 compares the evaluation data with a set standard, and controls the rotation speed of the flocculant supply pump 6 based on the comparison result. Generally, if the rotational torque is larger than a predetermined reference value, the rotational speed of the flocculant supply pump 6 is lowered and #! Decrease the amount of concentrate supplied. Conversely, if the rotational torque is smaller than the predetermined reference value, the rotational speed of the flocculant supply pump 6 is increased to increase the amount of flocculant supplied.

As understood from the above description, according to this flocculation device 1, the amount of flocculant r added is automatically controlled, and flocs in a preferable flocculation state can always be formed. Therefore, the dehydration process in the dehydrator 9 is also efficient.

As another embodiment, as in the flocculating device 5!1' shown in FIG. 2, instead of omitting the flocculating floc tank and the torque meter, a load detector 15 for detecting the load of the flocculating mixing tank agitator 7 may be used.
An example of this is a device in which the rotating torque in the coagulated flocs is detected.

Effects of the Invention According to the present invention, in an apparatus for mixing a flocculant into water treatment sludge to flocculate it, rotational torque detection is performed to rotate a rotating member in flocculated flocs generated by mixing the flocculant and detect the rotational torque of the rotating member. , an evaluation section that obtains evaluation data from the detected rotational torque, and an addition amount adjustment section that increases or decreases the amount of flocculant added in a direction that makes the evaluation data match a set standard. A flocculating device is provided, which makes it possible to automatically adjust the amount of flocculant added, and since there is almost no time delay in the adjustment, it is possible to continue forming flocs in a preferable flocculated state at all times. Therefore, subsequent processing efficiency can be improved.

[Brief explanation of drawings]

FIG. 1 is a schematic block diagram of a water treatment sludge flocculating apparatus according to one embodiment of the present invention, and FIG. 2 is a schematic block diagram of another embodiment of the apparatus. (Explanation of symbols) 1, l'...Water treatment sludge flocculation device 2...Sludge storage tank 3...Sludge supply pump 4.
...Flocculant mixing tank 5...Flocculant storage tank 6...Flocculant supply pump 7
... Coagulation mixing tank agitator 8 ... Flow meter 9 ... Dehydrator 10 ... Control device 11 ...
- Agglomerated floc tank 12... Torque meter rotor 13... Torque meter] 4... Standard setting means 15... Load detector S...
・Water treatment sludge f...Flocculant.

Claims (1)

[Claims] 1. In an apparatus for mixing a flocculant into water treatment sludge to flocculate it, a rotational torque detection unit that rotates a rotating member in flocculation flocs produced by mixing the flocculant and detects the rotational torque of the rotating member. A water treatment sludge flocculation characterized by comprising: an evaluation section that obtains evaluation data from the detected rotational torque; and an addition amount adjustment section that increases or decreases the amount of flocculant added in a direction that makes the evaluation data match a set standard. Device. 2. The water treatment sludge flocculating apparatus according to claim 1, wherein the rotational torque detection section includes a flocculating floc tank and a torque meter for rotating a rotor within the flocculating floc tank. 3. The addition amount adjusting section comprises a flocculant supply pump and a pump control means that compares the evaluation data with a set standard and controls the rotation speed of the flocculant supply pump based on the result. A water treatment sludge flocculation device according to item 1 or 2.