JPS60129178A - Method and device for batchwise waste water treatment - Google Patents

Abstract

PURPOSE:To treat efficiently waste water even in a small-sized treating tank by stirring stepwise the waste water under addition of a treating agent thereto in a treating tank and concentrating and settling sludge to flocks. CONSTITUTION:A required amt. of an adsorbent and flocculating agent are preliminarily put into a measuring cup 29. A submersible pump 16 is then driven to suck a prescribed volume of waste water from a waste water storage tank 15 into a treating tank 1. The adsorbent is first charged into the tank and a stirring shaft 2 is revolved forward and backward at a high speed by a driving motor 11 to stir thoroughly the waste water and to accelerate an adsorption effect. The flocculating agent is added to the waste water upon lapse of prescribed time and this time the shaft 2 is revolved forward and backward at a middle speed to mix thoroughly the flocculating agent with the waste water, thus forming flocks in the waste water. The shaft is then revolved in one way at a middle speed to regulate the flow of the waste water and to grow largely the flocks. The revolution of the shaft is finally slowed down to a slight speed to concentrate the flocks to the center in the bottom 1A of the tank. The flocks are discharged from a sludge discharge system 6.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a batch-type wastewater treatment method and its apparatus, and in particular, a batch-type wastewater treatment method that can efficiently perform coagulation-sedimentation treatment at a low equipment cost for treating small amounts of wastewater. and regarding its equipment.

Most wastewater sources in Japan have a relatively small volume of wastewater, and discharge is irregular and intermittent, and the composition of pollutants in wastewater also depends on the characteristics of the source. There are many things that are unique.

For example, in automobile repair shops, etc., the water used to wash floors at the end of the day and wash hands during breaks contains oil (
This is oily wastewater containing mineral oil (based on mineral oils) and detergents, and the workplace discharges a small amount of wastewater of almost the same quality every day.

Such wastewater, and wastewater that is generally discharged in small quantities,
Normally, a large amount of waste water is stored in a storage tank ζ, and after adjusting the quality of the waste water to be uniform, a certain amount of waste water is continuously flowed into a waste water treatment device for treatment.

However, although the above treatment method is called continuous treatment, the storage tank continues to run until it becomes a wall, and after the treatment is finished, it remains in a stopped state, and after the wastewater is stored in the storage tank again, operation is resumed. Become.

In this method, where wastewater is stored in a storage tank and then treated, it is necessary to install a large storage tank, and in order to process the wastewater continuously, a quantitative chemical injection pump that injects a fixed amount of chemicals during the treatment process, It is necessary to install a quantitative feeder for the drug, continuous sedimentation equipment, etc., which requires complicated equipment construction, requires a large amount of equipment cost, and requires a large amount of installation space. Since the regular operation is repeated with continuous operation and pauses, there are drawbacks such as the need for a one-time technique to control the injection of chemicals even though the wastewater is in small quantities.

A batch wastewater treatment tank using a sludge settling tank is known as a treatment method that does not require continuous treatment equipment.

This batch wastewater treatment involves repeating the process of filling the wastewater with pure white water, letting it settle by gravity for a certain period of time, draining the supernatant water using a swing siphon, etc., and then pulling out the remaining thickened sludge. This is suitable when waste water is discharged intermittently.

However, in the conventional batch wastewater treatment system, the sludge is separated by natural settling, so it takes time for the sludge to move vertically, and it is naturally deposited at the bottom of the sludge, making it easier to remove the sludge. In order to collect mud, it was necessary to make it into a steeply sloping funnel shape, which made the volume of the monk smaller.
When the volume is increased, the diameter of the cypress or the sieve becomes larger, creating a problem of installation space.

In view of this, the present invention has been made with the aim of providing a batch-type wastewater treatment method and its equipment that are low in equipment cost, require little installation space, and are easy to operate and manage. It is something.

The following two embodiments of the present invention will be explained with reference to the drawings. a processing tank 1 installed in the processing tank 1, a stirring @ 2 installed vertically in the center of the processing tank 1, a ms means 3 for giving rotational drive to the stirring shaft 2 in a predetermined direction and speed, and The treatment tank includes a wastewater inflow line 4 connected to the upper part, a supernatant water discharge system 5 connected to the lower part of the treatment tank 1, and a sludge discharge system 6 connected to the bottom of the treatment tank 1. A chemical injection means 7 is provided in the upper interior of the tank 1 .

Next, a specific example of the configuration of each of the above parts will be explained. The processing tank 1 has a cylindrical shape, and the part 1A is formed in the shape of a funnel with a gentle slope.
A large sludge discharge port 8 is opened at the lowest central portion of A.

The stirring shaft 2 is rotatably supported by a bearing (not shown) at the center of the upper part of the processing tank 1, and is vertically disposed close to the bottom 1A of the processing tank 1, and has stirring blades 9 at its lower part.
, 9 are attached in a crossed manner. The stirring function of the stirring blades 9, 9 has three functions: stirring and mixing by turbulent flow, granulation by medium-speed rectification, and central sludge collection by slow-speed m-flow circulation. Yes, stirring 41
11] A pulley 10 is attached to the upper part protruding from the processing tank 1 of 2, and this boo 1J-, 10 and the reversible motor 1
A belt 13 is hooked around a pulley 12 where m=1 by 1, and the stirring shaft 2 is rotated in one direction and in forward and reverse directions by the drive of a motor 11, and constitutes a driving means 3. Note that this drive means is not limited to a belt and a pulley, but may be other means, and the motor 11 is a normal one-way rotary motor, and a clutch is included in the two-rotation transmission system to switch the rotation direction and speed. A transmission may also be provided.

The wastewater inflow system 4 that supplies wastewater into the treatment tank 1 is connected to the upper part of the treatment tank 1 -11! Wastewater supply pipe 1 connected to l
4 and a submersible pump 16 to which the end of this supply v14 is connected and placed in the wastewater storage mls.

The sludge discharge system 6 includes a riser 17 that is connected to a large sludge outlet 8 in the center of the J1 section 1A of the treatment tank 1 and rises at a predetermined water level, and a sludge discharge cock that is branched from this riser 17. The lower end opening of this molecular lit pipe 19 is placed above the turntable 21 on which the sludge baskets 20, . . . are placed. It is preferable to use a transparent pipe for the riser pipe 17. By doing so, it becomes easy to visually monitor the sludge discharge status, and the sludge discharge status can be detected by, for example, an optical detection means. This is effective for automatic control (valve switching).

The supernatant water discharge system 5 has a supernatant water discharging system n connected to the lower side of the processing tank l and hanging down via a supernatant water discharge cock 228, and the lower end opening of this discharge pipe B is connected to the turntable 21 mentioned above. Please come to the top.

Sae is a large faucet for draining supernatant water at high speed when there is no need to filter it.

The turntable 21 is installed in the company to rotate on the flow plate δ, and the turntable 21 is provided with a required number of drainage holes 26 above and below.

A drainage port 27 is provided at one corner of the sink plate, from which lid water is collected at a predetermined location.

The sludge basket placed on the turntable 21 is made of punched metal with many small holes around the periphery.

A net, which can drain the pond water, has a structure in which a dehydrated N28 made of special rayon, ultrafine polyester, etc. is inserted, and the opening of this bag is folded back outside the opening of the sludge basket. It is supported by

The chemical injection means 7 is provided inside and above the processing tank 1, and in this embodiment, two sets are provided so that 24'Nf of chemicals can be injected. This injection means has a cup holder #4 (equipment) that maintains the measuring cup force,
On this holding mechanism side, as shown in FIGS. 9 to 11, a bent part of a cup holding plate 32 having an L-shaped surface 111t is attached to a support member 31 fixed in the processing tank 1 by a hinge 33. A retaining lever 36 is pivotally supported so as to be freely rotatable up and down, and at the upper end of the rising portion 32A of the cup holding plate 32 is a retaining lever 36 which is supported by a pin on a column 34 erected on the support member 31. A locking portion 36A at the tip is detachably arranged, and when the locking portion 36A engages with the upper end of the rising portion 32A, the cup mounting surface 32B of the cup holding plate 32 is maintained in a horizontal position. It looks like this. The locking lever 36 is connected to a solenoid 37 attached to the support column 34.
When the plunger is connected to this solenoid 37, the tip side of the locking lever 36 is pulled up to lock it.
36 A fi: It is shaped like a bell from the top of the rising portion 32A.

On the cup mounting surface 3213 of the cup holding plate 32,
A cup holder 38 for holding the measuring cup 29 is provided. In this embodiment, a hook-shaped holding cylinder 3 into which the lower half of the measuring cup 4 can fit is provided between the cup holding parts.
8A is fixed to the cup holding plate 32, and this holding cylinder 38
A has a vertical groove 38B on one side into which the handle 29A of the measuring cup 29 can fit, and a horizontal groove 38C extending horizontally from the bottom of the vertical groove 38B to one side.
38B, and then turn the measuring cup 29 in the direction of the horizontal groove 38C, so that the tongue piece 38D formed by the horizontal groove 38C is inserted into the inside of the handle 29A to hold the cup. Even if the plate 32 is laid down, the measuring cup 4 is prevented from falling off. At this time, if the dimensions are determined so that the handle 29A comes into pressure contact with the side surface of the rising portion 32A of the cup holding plate 32, the stability of holding the measuring cup 29 can be increased. In addition, in order to soften the shock when the cup holding plate 32 falls down and the cutlet serving surface 32B takes a vertical position, the supporting member 31
It is desirable to attach a cushioning material 39 to the end face of.

Note that the configuration of the cup holding mechanism (9) is not limited to this, and may be, for example, a tank bottom in which the measuring cup force is held by a pair of temporary springs.

A level switch 40 is provided on the outer side of the treatment tank 1, and a level switch 40 is provided on the outside of the treatment tank 1, and a constant violet level of wastewater (in the embodiment, 1 level) is provided in the treatment tank 1.
m3) is used to automatically start a processing operation when supplied.

Next, the operation of the above-mentioned apparatus and the wastewater treatment process according to the method of the present invention will be explained with reference to FIGS. 2 to 8.

Before starting the treatment process, fill measuring cups 29 and 29 with the necessary amount of adsorbent and @
Measure and put the nesting agent in this measuring cup 29, 2.
9 into the holding cylinder 38A on the horizontally placed cup mounting surface 32B of the valley cup holding [f13tJ, turn the measuring cup 29, and insert the tongue piece 38D into the handle 29A to hold it. put.

In addition, on the turntable δ, the sides of the sludge basket, in which a sludge bag has been inserted and secured at its mouth, are placed evenly, and the cocks 18, O, and 24 are closed. .

This is submersible pump 16 I! When water is added, the submersible pump 16 is driven as shown in the second diagram to pump up wastewater from the wastewater storage tank 15 and supply it to the processing tank 1. In this case,
Since the submersible pump 16 has an automatic operation structure, the wastewater storage tank 1
It is operated according to the amount of wastewater within 5.

The water is supplied into the processing tank 1 up to a predetermined water level.

When the wastewater in the treatment tank 1 reaches a predetermined water level, the level switch 4υ detects this and the operation of the submersible pump i6 is stopped based on the signal.

At the same time, the solenoid 37 between the cup holding mechanisms of the measuring cup 4 containing the adsorbent is energized.

As a result, the tips Q'& iWI of the locking lever 36 are pulled up and the retaining portion 36A is removed from the rising portion 32A of the cup holding plate 32, so that the cup holding plate 32 is rotated forward about the hinge 33. (Figures 3 and 10, broken line diagrams are in poor condition).

By this operation, the adsorbent in the measuring cup 29 is thrown into the waste water of 1 yen of the processing tank, and at the same time, the drive motor 11 of the stirring shaft 2 is activated, and the stirring l1IlI12 is rotated in the forward direction.

They rotate in opposite directions to sufficiently agitate the wastewater and promote adsorption (as shown in Figure 4). This adsorption process is approximately 15~2f
Stirring was continued for J minutes and stirred! The rotation 1112 is a high speed rotation.

When the above-mentioned time has elapsed, the measuring cup 29 containing the flocculant is brought down in the same manner as in the previous case, and the flocculant is poured into the waste water. At this time, the stirring shaft 2 is rotated at a medium speed, and continues to rotate forward and reverse for about 3 minutes to carry out a pre-aggregation step in which the flocculant is sufficiently mixed. At this stage, flocs begin to form in the wastewater.

Subsequently, after the above-mentioned time has elapsed, the stirring shaft 2 is rotated in one direction. The wastewater in the treatment tank 1 is now in a turbulent state due to forward and reverse rotation of the stirring shaft 2, but by shifting to the unidirectional rotation using the medium-speed rotation described above, the wastewater flows as shown in Figure 12. The whole body begins to rotate in the same direction at a constant speed, creating a large vortex in the center. This occurs when the turbulent flow of wastewater becomes regularized, and as a result, the flocs grow large while maintaining loose contact with each other, and the post-coagulation process is carried out (Fig. 5, 7J).

During this time, about 3 minutes is sufficient.

When the above period of time has elapsed, the rotational speed of the stirring shaft 2 is reduced to a slow rotation, and the wastewater in the treatment tank L is rectified into a laminar flow as shown in Figure 13. This laminar flow slows down the flow velocity in the center, so flocs gather in the center where the flow velocity is slow to resist the flow of water, and are rapidly concentrated in the center of the nozzle section 1A. This precipitation focusing process continues for about 8 minutes,
Clean supernatant water is formed in the upper part of the processing tank 1 (as shown in Figure 6).

The eye movement processing process ends when the above time elapses, but the time required for each of these processes is set in advance by a timer.
This is done by boiling the water once and controlling the motor 1 accordingly. - Encircle the discharge cock 18 of the sludge discharge system 6 (and remove the sludge that had collected in the center of the bottom 1A of the treatment tank 1).
is discharged into the sludge bagway of the sludge cage wall through the riser 17 and the branch 19. At this time, since the water in the treatment tank 1 is still rotating, it is sucked into a spiral shape, and all of the sludge can be removed. When one sludge or sludge bag is full of sludge, turn the turntable 2.
1 to position a new sludge basket 20 directly below the branch pipe 19 of the sludge discharge line 6 to continue discharging sludge. When clean submerged water is discharged from this branch pipe 19, the sludge discharge cock 18 is closed.

The supernatant water remaining in the treatment tank 1 is all clean water, but if some small flocs remain, open the supernatant water discharge cock 4 of the supernatant water discharge system 5 and drain it into the sludge basket through the drain pipe. This sludge is passed through a sludge bag channel in the tank, and only <'H water is recovered through the drain port n of the sink plate 5. Furthermore, if the supernatant water is already clean, it can be quickly recovered by opening the valve 24 of the outlet 8 and discharging it.

The adsorbent used in the treatment process of the present invention may be adsorbents such as montmolinite thread adsorbent, bentonite, gravel soil, oily clay, activated carbon powder, or mt [band, pack, sodium aluminate]. It is also possible to use inorganic flocculation aids such as calcium chloride, and the opening and closing operations of cocks in the sludge removal and subsequent drainage processes are not dependent on availability.

It is also possible to automate the process by using a sensor that detects the sludge discharge status or by using a mechanism that automatically opens and closes after a certain period of time.

Furthermore, several auxiliaries 4441, 41, . . . are rotatably attached to the inner circumferential surface of the processing tank 1, as shown in a schematic plane in FIG. 14, and are raised and rectified during agitation and mixing.

In the case of laminar flow, it can be tilted as shown in Fig. 15 to assist the rotation υ1t.

As explained above, the present invention is achieved by injecting a predetermined amount of wastewater into a treatment tank, then adding a sorbent, and rotating the central stirring bale j forward and backward at high speed (jL stirring and mixing, and then stirring and mixing for a certain period of time. After the elapsed time, a flocculant is added and the rotation is continued in forward and reverse directions to form flocs.Then, the stirring shaft is rotated in one direction at medium speed to rectify the wastewater to grow flocs, and then the stirring shaft is rotated at a very low speed. Then, the flow was changed to laminar flow to allow the flocs to settle in the center of the treatment tank, and the floc-formed sludge was discharged through the sludge discharge system. Sludge can be discharged with extremely high efficiency compared to conventional treatment, and since the treatment tank is cylindrical and sludge can be removed in a concentrated manner by simply providing a gentle slope to the paper section, the internal volume of the treatment tank can be maximized. I can do it.

It does not increase the height of the tank and requires less installation space.

In particular, since there is no need to store the wastewater discharged, the cost of installing a large storage tank and related equipment costs are also low. It is extremely effective as a treatment for

[Brief explanation of drawings]

FIG. 1 is a partially cutaway perspective view of an embodiment of a batch-type wastewater treatment apparatus suitable for implementing the present invention, FIGS. 2 to 8 are explanatory diagrams showing the same operating state, and FIG. 9 is a chemical injection means. FIG. 10 is a perspective view showing an example of the same, FIG. 10 is a side view showing the same operating state, and FIG.
Figure 12 (B) is a perspective view showing the relationship between the cup and the cup holder. FIG. 13 is a 4-explanatory diagram showing the N and dynamics of wastewater in the treatment tank, and FIGS. 14 and 15 are explanatory diagrams when an auxiliary tank is installed in the treatment tank. DESCRIPTION OF SYMBOLS 1... Processing tank, 2... Stirring shaft, 3... Drive means, 4... Waste water inflow system, 5... Supernatant water discharge system, 6...
...Sludge discharge system, 7.Medicine injection means, 9.Agitation, 15.Wastewater storage tank, 16.Submersible pump, lδ
...Sludge discharge cock, addition...Sludge basket, 21...
・Turn tea full, 22, 24...1 Weeping water discharge cock,
b...Sink plate,...Sludge bag, 29.Measuring cup, addition...Cup holding mechanism, 31...Support member, 32...
・Cup holding plate, A...Retention lever, 38...Cup holding gB, 40...Level switch. Applicant's agent Kiyoshi Inomata Drawing Kiyoshi (no change in content) Procedural amendment January 1980] Japan Patent Office Commissioner Kazuo Wakasugi 1, Indication of case April 1982! J. Application No. 237805 2- Invention o
Name: Batch-type wastewater treatment method and its equipment 3; Person making the amendment; Relationship with the case; 4.1" Applicant: Nissin Seiki Co., Ltd.; 7; drawings to be amended; 8; content of amendment; (no change in content).

Claims (1)

[Claims] 1) After injecting a predetermined amount of wastewater into the treatment tank, a layer absorbing agent is added and the central stirring shaft is rotated forward and backward at high speed to stir and mix, and after a certain period of time, it aggregates. The agent is added and rotated vertically in forward and reverse directions to form flocs, then the stirring shaft is rotated once at medium speed to rectify the wastewater to grow flocs, and then the stirring shaft is rotated at a slow speed to form flow Ii. 1viI
The flocs are concentrated in the center of the treatment tank by switching to a hot stream, and the flocs are discharged through the flocculated sludge discharge thread. Characteristic batch wastewater treatment method O 2) The bottom part has a cylindrical inner peripheral surface A processing tank shaped like a funnel with a gentle slope, a stirring shaft vertically disposed in the center of the processing tank and having stirring blades at the lower part, and a drive means for driving the stirring shaft to rotate in a predetermined direction and speed. A batch wastewater treatment apparatus comprising: a wastewater inflow system for injecting wastewater into the treatment tank; a sludge discharge system; and a chemical injection means. 3) The batch type wastewater treatment apparatus according to claim 2, wherein the liquid injection means is constituted by a measuring cup rotatably supported in the upper interior of the treatment tank.