CN115364531A - A gravity concentration anti-sedimentation device for sand washing wastewater - Google Patents

Abstract

The invention discloses a gravity concentration anti-sedimentation device for sand washing wastewater. Liquid discharge outlet, the concentration tank at the center of the overflow weir groove is vertically provided with a steady flow central cylinder, the lower end of the steady flow central cylinder is provided with a sludge outlet on the wall, and the lower end of the steady flow central cylinder is fixed with a conical reflector , the center of the concentration tank below the reflection plate is vertically provided with the submersible deceleration motor, the bottom of the concentration tank is in an inverted conical shape, and an anti-sedimentation device is arranged in the bottom of the concentration tank. The rotating shaft of the motor is connected, the speed of the anti-sedimentation device is 2 rpm, and the center of the bottom of the concentration tank is provided with a mud discharge port; a waste water inlet pipe is passed between the steady flow central cylinder under the overflow weir groove and the wall of the concentration tank. The mouth of the waste water inlet pipe is bent towards the top of the steady flow central cylinder.

Description

A gravity concentration anti-sedimentation device for sand washing wastewater

technical field

The invention belongs to the field of sand washing wastewater treatment, in particular to a sand washing wastewater gravity concentration anti-sedimentation device.

Background technique

Sand washing waste water refers to the waste water produced by water washing sand and stone production enterprises in the process of sand washing. Sand and gravel are one of the basic materials for construction. With the increasing domestic demand for sand and gravel, natural sand is facing the pressure of resource reduction and environmental protection. Washed sand will become an important source of construction sand in the building materials market. Washed sand can be widely used in concrete, mortar and products, and it has increasingly shown good market prospects in modern construction projects. The gradual replacement of natural sand in terms of quality and quantity is one of the signs that the artificial sand production line has entered a new period of development. It is precisely because of the wide demand for washing sand with water that more and more sand washing wastewater is produced. If the sand washing wastewater is not treated, it cannot be reused, and direct discharge will cause water pollution. Because the sand washing wastewater has a relatively high mud content Large, at this stage, the sludge in the wastewater is settled by adding flocculants and using natural sedimentation, and the supernatant enters the clear water tank for reuse. Therefore, it is very important to use efficient and reliable sand washing wastewater treatment equipment.

Contents of the invention

The purpose of the present invention is to provide a gravity concentration anti-sedimentation device for sand washing wastewater. The sludge in the sand washing wastewater enters the sludge dewatering equipment after being concentrated and precipitated, thereby effectively reducing the load of the sludge dewatering equipment and greatly increasing the content of the mud cake. Solid rate, to achieve the purpose of sand washing sludge reduction.

The present invention is a gravity concentration anti-deposition device for sand washing wastewater. The specific technical scheme is as follows: it includes a concentration tank and a submersible deceleration motor. The concentration tank is a vertical tank. There is a supernatant discharge outlet on the side wall of the top of the tank, and a steady flow central cylinder is arranged vertically in the thickening tank at the center of the overflow weir groove, and a sludge outlet is arranged on the lower end of the steady flow central cylinder. The lower end of the central cylinder is fixed with a conical reflector. The submersible deceleration motor is arranged vertically in the center of the concentration tank under the reflector. The bottom of the concentration tank is in the shape of an inverted cone. Conical anti-sedimentation device, the central axis of the anti-sedimentation device is connected to the shaft of the submersible geared motor, the rotation speed of the anti-sedimentation device is 2 rpm, and the center of the bottom of the concentration tank is equipped with a mud discharge port; the steady flow under the overflow weir groove A waste water inlet pipe runs horizontally between the central cylinder and the wall of the concentration tank, and the mouth of the waste water inlet pipe is bent towards the top of the steady flow central cylinder.

The working process of the present invention: the sand washing wastewater enters the steady-flow central cylinder through the wastewater inlet of the concentration tank, and enters the concentration tank through the reflection plate at the bottom of the steady-flow central cylinder under the action of gravity; The overflow weir and flute on the top of the concentration tank is collected and discharged through the supernatant liquid discharge port, and the settled sludge is discharged from the sludge discharge port at the bottom of the cone tank. The speed makes continuous rotating motion to prevent sludge deposition. At the same time, it adopts extremely low speed to realize the normal sludge settlement process without affecting the quality of the supernatant effluent.

The high-efficiency gravity concentration tank body of the present invention adopts a vertical structure occupying less land, and a sludge anti-sedimentation device is installed at the bottom. The wastewater from sand washing enters the steady flow center tube of the gravity concentration tank after being conditioned by dosing, and slowly enters the concentration tank through the reflection plate at the bottom of the center tube. The overflow weirs and flutes are collected and discharged, and the settled sludge is discharged from the bottom of the cone tank. Due to the characteristics of high viscosity and easy deposition of sedimented sludge, it is easy to cause sludge deposition at the bottom of the tank when the existing equipment is in operation, resulting in the failure of normal and continuous sludge discharge, which seriously affects the normal production process. Therefore, the sludge anti-sedimentation device of the present invention emerges at the historic moment to prevent sludge deposition and ensure the normal and continuous operation of thickening and discharging sludge.

The invention utilizes a high-efficiency concentration tank and an anti-sedimentation device to prevent sludge deposition during operation without affecting the water quality of supernatant effluent, and the recovery and reuse of supernatant greatly saves engineering water consumption. The separated mud cake is convenient for transportation and reloading, and can also be used for secondary use. The device of the invention has large processing capacity, simple operation, high working efficiency, less kinetic energy consumption and low processing cost. Compared with the existing technology, the present invention: 1. The high-efficiency concentration tank adopts a vertical cylinder body and a cone-shaped tank bottom structure, which effectively reduces the occupied area; 2. The anti-sedimentation device adopts a submersible geared motor to replace the traditional tank top-mounted motor reducer , eliminating the need for a long center drive shaft, easy installation, and low difficulty in parts processing and manufacturing; 3. It can run efficiently and stably, without worrying about the sludge deposition at the bottom of the tank caused by shutdown, greatly reducing labor costs; 4. The output speed of the submersible motor is 2 RPM, extremely low speed to ensure normal sludge discharge and anti-deposition without affecting supernatant water discharge; 5. Reduce the burden of subsequent treatment and effectively improve the productivity of sludge dewatering equipment; 6. The structure is simple and easy to disassemble, install and maintain.

Description of drawings

Fig. 1 is a schematic diagram of the front view structure of the present invention.

In the figure: 1—concentration tank, 2—supernatant liquid outlet, 3—overflow weir, 4—steady flow center tube, 5—wastewater inlet pipe, 6—reflector plate, 7— - Inspection manhole, 8 - submersible geared motor, 9 - anti-sedimentation device, 10 - mud discharge port, 11 - sludge outlet.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

A gravity concentration anti-sedimentation device for sand washing wastewater, as shown in Figure 1, includes a concentration tank 1 and a submersible gear motor 8, the concentration tank 1 is a vertical tank, and an overflow weir is arranged on the top of the concentration tank 1 Groove 3, the supernatant liquid outlet 2 is arranged on the side wall of the top of the concentration tank, and the concentration tank at the center of the overflow weir groove 3 is vertically provided with a steady flow center cylinder 4, and the bottom wall of the steady flow center cylinder 4 is A sludge outlet 11 is provided, and a conical reflector 6 is fixed to the lower end of the steady flow central cylinder 4. The submersible gear motor 8 is vertically arranged in the center of the concentration tank below the reflector 6, and the bottom of the concentration tank 1 is It is in the shape of an inverted cone, and an anti-sedimentation device 9 in the shape of an inverted cone is arranged in the bottom of the concentration tank, and the anti-sedimentation device 9 is a pair of rotating frames. The central axis of the anti-sedimentation device 9 is connected to the rotating shaft of the submersible gear motor 8, and the rotating speed of the anti-sedimentation device 9 is 2 revolutions per minute to stir the sludge. The center of the bottom of the concentration tank 1 is provided with a mud outlet 10; a waste water inlet pipe 5 is horizontally pierced between the steady flow central cylinder 4 below the overflow weir groove 3 and the wall of the concentration tank body, and the mouth of the waste water inlet pipe 5 is bent towards The top of the steady flow center cylinder 4. A maintenance manhole 7 is also arranged on the side wall of the bottom of the concentration tank body 1 .

The working process of the equipment: the sand washing wastewater enters the steady flow central cylinder 4 through the wastewater inlet pipe 5 of the concentration tank, and enters the concentration tank 1 through the reflection plate 6 at the bottom of the steady flow central cylinder under the action of gravity; the direction of the water flow is opposite to the sedimentation direction of the sludge particles. The clear liquid is collected from the overflow weir groove 3 on the top of the concentration tank 1 and discharged through the supernatant liquid discharge port 2, and the settled sludge is discharged from the sludge discharge port 10 at the bottom of the cone tank. Driven by 8, it performs continuous rotation at a speed of 2 revolutions per minute to prevent sludge deposition. At the same time, a very low rotation speed is used to realize the normal sludge settlement process without affecting the quality of the supernatant effluent.

Claims (1)

1. A gravity concentration anti-sedimentation device for sand washing wastewater, comprising a concentration tank and a submersible gear motor, characterized in that the concentration tank is a vertical tank, and an overflow weir is arranged in the top of the concentration tank, and the concentration tank The supernatant liquid outlet is set on the side wall of the top of the body, and the concentration tank at the center of the overflow weir groove is provided with a steady flow center tube vertically, and a sludge outlet is set on the lower wall of the steady flow center tube. The lower end of the cylinder is fixed with a conical reflector, and the submersible deceleration motor is vertically arranged in the center of the concentration tank under the reflector. Shaped anti-sedimentation device, the central axis of the anti-sedimentation device is connected with the rotating shaft of the submersible gear motor, the rotation speed of the anti-sedimentation device is 2 rpm, and the bottom center of the concentration tank is equipped with a mud discharge port; the steady flow center below the overflow weir groove A waste water inlet pipe is horizontally passed between the cylinder and the wall of the concentration tank, and the mouth of the waste water inlet pipe is bent towards the top of the steady flow central cylinder.

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