JP2000079400A - Thickner method and apparatus for raw concrete wastewater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform efficient solid-liquid separation by installing upper and lower thickeners and taking measures for excluding the action of a builder and promoting the sedimentation of particles. SOLUTION: In an upper thickener tank 3, a hollow vertical shaft 6 operated vertically is installed in the central part, an air diffusion pipe 5 having numbers of nozzles is installed at the lower end, and an air source communicates with the pipe 5 from the outside through the shaft 6. An aeration time for aerating the inside of the upper thickener tank 3 thoroughly and a stop time for stopping aeration are set up to be actuated automatically, and the air diffusion pipe 5 has a water spray function to change over air and water freely. A lower thickener tank 18 is mounted freely separably on a vibrator frame 21 and receives every batch of precipitated sludge falling from the upper thickener tank 3. Every time of the reception of the sludge, the frame 21 is vibrated for a prescribed time to accelerate the sedimentation/separation of the sludge, and supernatant is discharged/removed to house only concentrated sludge for a day.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thickener tank for separating supernatant water by sedimentation of turbid water mixed with cement in a ready-mixed concrete factory and a secondary concrete product factory.

[0002]

2. Description of the Related Art Thickeners used in conventional ready-mixed concrete factories have been widely used since ancient times, but all of them simply settle down naturally. The upper part has a large diameter cylinder and the lower part is conical and directly connected to the tip. And a discharge valve. With this structure, plugging accidents occur frequently. The effect of the admixture mixed in the ready-mixed concrete on the sedimentation and the hydration time of the cement is a method ignoring the effect on the sedimentation of the sludge water, so the water content is high and the strength after drying is determined by the Ministry of Health and Welfare. Uniaxial compressive strength is 80kg / c
Since in m ² or less are required to process a managed industrial waste.

[0003]

SUMMARY OF THE INVENTION Since the admixture incorporated in the ready-mixed concrete makes the cement particles finer, it takes time for sedimentation and separation, and the longer the time until the treatment, the more the hydration reaction of the cement. Since sedimentation is increasingly difficult due to progress, a method for removing more supernatant water and a thickener with good sedimentation efficiency have been developed. The present invention solves these problems by taking measures to eliminate the effect of the admixture and taking measures to further promote the sedimentation of the particles, and to add measures to prevent the discharge valve from clogging. The purpose of the present invention is to obtain an activated sludge having a lower moisture content than the method of the above.

[0004]

Means for Solving the Problems An upper-stage thickener tank 3;
Solid matter having a low water content is separated and recovered by cooperation of the lower thickener tank 18. In the upper thickener tank, the aggregate is first collected within 5 hours as soon as possible from the production time of the ready-mixed concrete. Receiving the separated sludge into the thickener tank is the basis for improving the compressive strength of the finally obtained sludge, and this is the first means. Next, in the upper-thickener tank, air is blown out from an internal air diffuser to aerate and break down the admixture film in the sludge to enlarge cement particles to promote the sedimentation. This is the second means. Next, the injection of air from the air diffuser is stopped, and a primary sedimentation step of sedimenting sludge water, which is a function of a thickener, is started. This is the third means. After the primary sedimentation, a fourth means for removing the supernatant water is performed. The upper thickener tank has a large-diameter cylindrical upper portion, and a frustum of a cone is fixed to the upper portion, and a cylindrical portion 10 having the same diameter as the lower portion of the frustum is provided below the frustum. The fifth means is that the sludge of the cylindrical portion 10 is gravity-dropped into the lower thickener tank by opening the discharge valve 12. A sixth means for performing secondary sedimentation in the lower thickener tank is provided. After the secondary sedimentation, after the seventh means for allowing the supernatant water to naturally flow out through the soft tube 20 with a float for each package, the concentrated sludge is used as a supplemental mortar for secondary products, etc. The solidified material is left to be recycled and treated as general waste.

Next, the apparatus of the present invention will be described. The configuration of the upper thickener tank 3 is such that a hollow vertical axis 6 operating vertically is provided at the center, and an air diffuser 5 having a number of noselets 15 is provided at the lower end, and an air source is scattered from the outside via the hollow vertical axis. It is connected to the trachea 5 and is set to automatically operate an aeration time for completely aerating the inside of the upper thickener tank 3 and a stationary time for stopping the aeration, and
It has a sprinkling function that allows switching between air and water. The lower thickener tank 18 is separably mounted on the vibrator mount 21 and receives the settling sludge falling from the upper thickener tank 3 for each badge, and the vibrator mount vibrates for a predetermined time each time. Promotes sedimentation and separation, the supernatant water is discharged and removed each time, and only concentrated sludge is stored for one day. In addition, according to the scale of the factory, if the amount of generated sludge exceeds the processing capacity of one set, two or more sets of the thickener method can be alternately provided with a time lag provided.

[0006]

Operation and Embodiment The operation of the present invention will be described based on an embodiment. Figure 1 is a front view of the upper and lower thickener tanks.
FIG. 2 is a plan view of the diffuser tube. Aggregate is removed from the generated sludge water and flows into the storage tank 1. In a small factory where almost no return condenser comes out, the aggregate can be put into the storage tank 1 without being separated by the separator. The sludge water put in the storage tank is supplied to the upper thickener tank 3 by the sand pump 2.
Flows into When it is detected that a predetermined time has elapsed after the inflow or a predetermined water level has been reached, the pump is stopped. After the sand pump 2 is stopped, the air valve 16 is opened and aeration starts from the blast nozzle 15 of the air diffuser 5 via the hollow longitudinal axis 6, and at the same time, the hollow longitudinal axis 6 connected to the cylinder lot 14 is extended and starts to descend. , The diffuser reaches the lower limit. From this stage, the ascending process is slowly entered, and each layer is aerated with air.
In this step, the admixture coating film is broken and the cement particles are enlarged, so that sedimentation is promoted. When the air diffuser reaches the upper limit water surface, the aeration of the air is also stopped. When the aeration is stopped, after a predetermined settling time has elapsed, the upper drain valve 7 is opened and the discharge of the supernatant water starts.

The lower drain valve 8 automatically opens after a predetermined time from the opening of the upper drain valve 7. Each of the valves 7 and 8 is provided with a flexible tube 11 with a float. The float is set to be located at the boundary between the concentrated sludge and the supernatant water, so that the intake of the flexible tube decreases with a decrease in the water level. . The supernatant water is discharged via valve 8 to the extent possible. Next, pinch valve 1
2 releases. The concentrated sludge falls into the lower thickener tank 18. When the discharge is completed, the pinch valve 12 is closed. This completes one batch process. The sand pump 2 is started again to start the second batch process. Lower thickener tank 18
The settling time is defined as the time until the start of the fall of the second batch, and the supernatant water is discharged through the flexible tube 20 with a float for each badge. The lower thickener tank is portable and is mounted on the vibrator mount 21 and vibrates for a predetermined time when the sludge starts falling. At the time of unloading, carry it out with a forklift or the like.

[0008]

As is apparent from the above, sludge immediately after generation of a large amount of unhydrated water is settled and separated.
Destruction of the admixture film by air blowing increases the size of the cement particles, thereby promoting sedimentation. Prevent clogging due to the provision of the cylindrical portion 10 in the lower part of the upper thickener tank. Since the upper and lower two-stage thickener system is used, the lower-stage thickener tank can have a wide sedimentation surface, and the sedimentation efficiency is improved. By providing initial vibration to the lower thickener tank, sedimentation is promoted and the tank becomes a cake storage tank as it is. In terms of economy, (a) the price is much lower than that of a filter press dewatering machine which is the mainstream of the conventional ready-mixed wastewater treatment method. (B) Very little maintenance costs. (C) The strength of the cake is uniaxial compressive strength 80kg / cm
^{Since it is 2} or more, it is possible to escape from managed waste and to recycle, which can contribute as a pollution control device.
(D) Since this development involves immediate full-thickener treatment, the stirrer and shed and other related equipment required in the past as well as storage tanks are greatly reduced, and the overall economic effect is large.

[Brief description of the drawings]

FIG. 1 is a front structural view of a thickener tank of the present invention.

FIG. 2 is a plan view of a diffuser tube.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Storage tank 2 Sand pump 3 Upper thickener tank 4 Air cylinder 5 Air diffuser 6 Hollow vertical axis 7 Upper drain valve 8 Lower drain valve 10 Cylindrical part 11 Flexible tube with float 12 Pinch valve 13 Flexible flat valve 14 Cylinder lot 15 Fume nozzle Nozzle 16 Air valve 17 Water supply valve 18 Lower thickener tank 19 Overflow port 20 Flexible tube with float 21 Vibrator mount

Claims (3)

[Claims] 1. Two thickeners made of steel plate are arranged one above the other,
A first means for treating sludge for each batch, receiving sludge separated from the aggregate into the upper thickener tank within 5 hours from the production time of the ready-mixed concrete;
The second means for setting the time from the air diffuser provided in the thickener tank to blow out and aerate the air, the third means for stopping the air and performing the primary settling of the sludge water, and the supernatant water after the primary settling Fourth means for removing, fifth means for gravity drop to the lower thickener tank by opening and closing the discharge valve of the upper thickener tank, and sixth means for adding secondary vibration by adding wavy vibration in the lower thickener tank, The seventh means for removing the supernatant water after the secondary sedimentation, and the concentrated sludge obtained through the seventh means is used as a recycled mortar, or is left as it is, and the solidified matter is recycled and industrial waste A thickener method for ready-mixed concrete wastewater, characterized in that it is treated as waste. 2. The configuration of the upper thickener tank 3 is that the upper part is a large-diameter cylinder, then a truncated cone is provided, the lower part is a cylindrical part, and the central part is provided with a hollow longitudinal axis 6 that operates vertically. A diffuser tube 5 having a large number of fuze noseles 15 is installed at the lower end of the tank, and the air source communicates from the outside to the diffuser tube 5 through the hollow longitudinal axis, and aeration time for uniformly aerating the inside of the upper thickener tank 3 and Setting the standstill time to stop aeration automatically to operate, and the air diffuser, air,
It has a washing function to make it possible to switch between water and water. The configuration of the lower thickener tank 18 is portable, and the area is several times larger than the lower cylindrical portion 10 of the upper thickener tank 3 in area.
It is placed on the vibrator mount 21 and receives falling sedimentation sludge for each badge. The supernatant water is naturally drained and removed each time, and only concentrated sludge is stored. Supplementation of mortar such as secondary products A thickener device for ready-mixed concrete wastewater, characterized in that the material is used immediately and the remainder is treated after consolidation. 3. The method according to claim 1, wherein a plurality of sets of the thickener devices arranged above and below are juxtaposed, and the water filling, aeration and sedimentation operations are alternately performed with a time difference. Concrete wastewater thickener method and equipment.