KR200177214Y1 - Waste sands in pretreatment process do in favor of sand removal - Google Patents

Abstract

The present invention relates to a settler that has improved sand removal efficiency to smoothly process sewage and wastewater by completely removing sand even when the flow rate is changed in the settling basin provided in sewage and wastewater treatment plants. In a pretreatment facility consisting of a conventional sink with a four-sided channel and a pump absorption well, an influent flowmeter (6) is installed in front of the sink and the 'sump' cross section is formed on the sink side of the pump sink (A). The bottom part is connected to the opening part E, and the upper part is partitioned by the partition wall 9 so as to communicate with the overflow part 8b, and the overflow wear on the needle tip hopper part D at the tip of the settlement basin C. A four-sided sluice gate (1) is installed and connected to the hydrologic lifting shaft (1a) of the sluice actuator (2) installed on the slab on the upper side thereof. On the slab It is connected with the hydroelastic lifting shaft (8d) of the installed hydrologic actuator (8b), and the water level indicator (5) is installed on the slab in front of the quadrilateral hydrology. The electric motors (3) and (8a) are connected to the respective measuring devices of the control device by the water level transmission line 5a, the flow rate transmission line 6b, the hydrological opening transmission line 7a and the motor power supply line to the control device 7, and the output of the control device. The line 7c is connected to the central control room to increase the sand removal efficiency irrespective of the flow rate or flow rate flowing into the settlement.

Description

Settled sand with increased sand removal efficiency {Waste sands in pretreatment process do in favor of sand removal}

The present invention relates to a sedimentation basin provided in sewage and wastewater treatment plants. More specifically, the present invention relates to a sedimentation basin which increases the sedimentation efficiency by maintaining a constant flow rate of sewage or wastewater in the sedimentation basin.

In general, in sewage treatment plants and wastewater treatment plants, most of the sedimentation sites are installed in the front process of water treatment, and the sand contained in the sewage (usually about 1.2 mm or more in diameter) is precipitated by gravity and removed out of the sedimentation site by the sediment remover. Sand is introduced into the water treatment plant and the sludge treatment plant including the phosphorus pump well, the pump, the pipe, the initial sedimentation basin, and the above-mentioned equipment of the machinery is prevented from being disturbed.

In particular, in Korea, where the combined sewage treatment system is adopted, the removal of sediment inlet sand is treated as a very important process because of the large amount of sand inflow.

Currently, the design flow rate of the settling basin is maintained at 0.3m / sec based on the maximum flow rate of time, and in general, a stoplog is installed at the rear end of the settling basin to maintain the flow rate.

However, in this conventional settlement, as shown in FIG. 2, the amount of sewage inflow changes significantly with time, so that the design flow rate is kept very short in the settlement, and in most cases, it is lower than the design flow rate or significantly higher. When the design flow rate is higher than the design purpose, the sand to be removed is transferred to the downstream facility through the pump well, causing obstacles (blocking, increasing the wear of the machine, or lacking capacity).

In addition, when it is lower than the design flow rate, the seal sand, clay, and organic matters are deposited together in the sedimentation basin to increase the amount of sediment removal, or the muds are buried together in the sewage dust collector to contaminate the surroundings or make it difficult to process the contaminants. It also gives off a bad smell.

Another problem is that in the combined sewage drainage method, the flow rate in rainy weather is about 3 times faster than normal flow rate, and the design depth cannot be tripled in rainy weather. When it is early, sand is not removed from the sedimentation basin, and a considerable amount of sand flows into the pump well, and sand is transferred to the next water treatment facility and sludge treatment facility, so that sand is not removed smoothly. There is a problem that does not work properly.

The present invention makes it possible to smoothly treat sewage and wastewater by completely removing sand by keeping the flow rate constant even if the inflow rate changes in the settlement.

1 is a schematic illustration showing the settling paper of the present invention

2 is a diagram showing a change in the amount of sewage inflow flowing into the settlement

3 is a block diagram of the control device of the present invention

[Explanation of symbols for important parts of the drawings]

1: monthly wear-type quadrilateral sluice, 8a: hydrologic actuator,

8a: motor for driving, 4: hydrological guidance and transmission device,

5: water meter, 6: flow meter,

7: control unit, 8: water gate,

9: bulkhead, 10: subsidence,

11: It's a distribution.

1 is an exemplary view showing the immersion site of the present invention, the immersion site of the present invention installs the overflow wear type quadrilateral gate 1 having a sufficient height at the pump tip inlet portion (A) of the back of the settlement in the conventional quadrilateral section And install a hydrologic actuator (2) on the slab (B) thereon, connect the hydrologic actuator (2) and the overflowware-type quadrilateral gate (1) with the hydrographic lifting shaft (1a), and the hydrologic actuator (2). ) Is installed with a driving motor (3) and a water gate instruction and transmission device (4), and a water gauge (5) is installed on the slab (B) on the surface of the water at a suitable position in front of the overflowware-type quadrilateral gate (1). It was.

An inflow flowmeter 6 was installed in front of the settling basin C, and a flow sensor 6a was installed in the water channel, and a signal line 6c was connected between the flow sensor 6a and the flowmeter 6.

The control device 7 is installed at a suitable position on the settlement slab B so that the water gauge 5 and the water level transmission line 5a, the flow meter 6 and the flow rate transmission line 6b, and the hydrological opening instruction and transmission device 4 are installed. Was connected to each measuring instrument of the control device by the hydrological opening transmission line (7a), connected to the driving motor (3) by the motor power supply line (7b), and the output line (7c) of the control device (7) was connected to the central control room. .

Settle the hopper part (D) with a slightly deeper bottom in the pump well in the horizontal direction, and distinguish it from the pump well by the bulkhead (9). An opening and closing water gate 8 is installed in the opening E near the bottom, connected to the water gate actuator 8b with a lifting shaft 8c, and a water gate motor 8a is attached to the water gate actuator 8b. (8c) was connected to the control device (7) and the needle tip remover (10) was installed in the bottom of the needle tip hopper (D).

In addition, the distribution plate 11 of an appropriate size was installed at the rear of the overflow wear type quadrilateral gate 1.

As shown in FIG. 3, the control device 7 is composed of an I / O unit, a CPU, a display unit, a memory, a cover showner, and the like, and receives a water level signal, a flow rate signal, a hydrological opening signal, and performs arithmetic processing to obtain an appropriate level. 3) and hydro gate motor 8a can be controlled and communication with central control room (DCS) is also possible.

If the width of the settling channel part is now B and the depth of water is H, the cross-sectional area A through which water passes is A = B × H, and the flow rate Q is Q = V × A (V is the flow velocity).

However, in order to achieve the purpose of settling, the flow rate V must be kept constant at 0.3 m / sec, so Q = V × A = 0.3 × A = 0.3 × B × H, and the width of the settling basin B is also constant. Same as the equation.

Q = K₁ × H

Therefore, it can be seen that the water velocity V becomes constant if the depth H in the settlement is proportional to the inflow flow rate Q.

Therefore, when the inflow flow rate from the flowmeter 6 is input to the control device 7, the control device 7 sends a control signal to the required depth H according to the above equation, and the positioner moves the overflowware-type quadrilateral gate 1. The drive motor 3 is operated so as to operate at the required depth H.

Since the water level signal is input to the control device 7 in the water gauge 5, the control device 7 sends a control signal to stop the overflowware-type quadrilateral sluice 1 at its position when the required depth H is reached. (1) is fixed at that position, the required depth H is maintained, and the design flow velocity 0.3m / sec is maintained with respect to the flow rate Q at that time, so that the sedimentation effect corresponding to the design purpose can be exerted.

At this time, the water gate for the opening and closing in the absorption well is kept open so that the water level in the settlement can be maintained at all times, and the absorption well surface is kept below the maximum flow rate of the pump.

Since the time required for such a control operation is very short, even if the inflow flow continues to change, the water level H in the sedimentation zone is immediately changed accordingly, so that the flow rate V = 0.3 m / sec in the sedimentation basin is always maintained.

In case of rain, a large amount of sewage flows in and the position of the overflow wear type quadrilateral sluice (1) cannot be raised any more (usually based on the maximum flow rate of time). 7) closes the gate 8 for opening and closing by operating the hydro gate actuator 8b by giving a control command to the gate motor 8a so that the position of the overflow wear-type quadrilateral gate 1 becomes the minimum position or the highest position.

Then, the sedimentation influent flows evenly from the distribution plate 11 and fills the inside of the partition 9, and then flows into the absorption well beyond the upstream portion 9a of the top of the partition 9.

Since the depth inside the bulkhead (9) is deep and the width is as wide as the pump absorption well (A), the average flow velocity of this portion is very slow. Sand does not enter.

The sand precipitated here is lifted off by the sediment remover 10 installed at the bottom.

As described above, the settling place of the present invention is always easy to remove the settling and at the same time can prevent the sedimentation of seals, clay, organic matters, etc., to prevent obstacles such as damage to various facilities that may occur in the subsequent process, and within the settling paper It may facilitate the removal of sedimentation and the removal of contaminants.

Claims (1)

In a pretreatment system consisting of a conventional sinking basin (C) with a four-sided channel and a pump absorption well (A), an influent flowmeter (6) is installed in front of the sinking basin (C), and the pump absorption basin behind the sinking basin (C). In (A), the bottom portion of the submerged hopper section D having a slightly deep '┗┛' cross-section communicates with the opening portion E, and the upper portion is partitioned with the partition wall 9 so as to communicate with the overflow portion 9a. (C) Install the overflowware-type quadrilateral sluice (1) on the immersion hopper part (D) at the end and connect it with the hydrologic lifting shaft (1a) of the hydrologic actuator (2) installed on the slab above the partition wall (9). In the lower part of the opening (E), a water gate (8) is installed and connected to the hydrologic lifting shaft (8d) of the hydrologic actuator (8b) installed on the slab thereon, and the water gauge (5) is placed on the slab in front of the quadrilateral gate (1). To install the water level indicator (5), the flow meter (6) and the hydrologic actuator, and the control device (7) and the motor (3) and (8a). ) Is connected to each measuring instrument of the control device by the water level transmission line 5a, the flow rate transmission line 6b, the hydrological opening transmission line 7a, and the motor power supply line 7b, 8c. Settlement sites that increase sand removal efficiency by connecting to control rooms.