Concrete sewage concentration automatic adjusting control system and sewage recycling method

Abstract

The invention discloses an automatic concrete sewage concentration adjusting and controlling system and a sewage recycling method. According to the technical scheme, the device comprises a gravel separation mechanism which is used for effectively separating and recycling most of gravel in concrete sewage. The separated sewage is discharged into a sewage pool to be stored. Then, sewage is conveyed to a sewage adjusting tank through a sewage pump, and meanwhile, clean water is pumped to the same adjusting tank through a clean water pump. A sewage measuring device is arranged above the sewage adjusting tank and is used for detecting through an ultrasonic technology so as to obtain the density information of sewage in the sewage adjusting tank. And a measurement result is compared with a preset value of the cloud control system for analysis, so that the pumping amount of the sewage or clear water is automatically adjusted, and the stability of the sewage concentration is ensured. According to the technical method, the large-batch blending process of the concrete sewage can be effectively realized, and the blending efficiency is remarkably improved.

Description

Technical Field

[0001] This invention relates to an automatic control system for adjusting the concentration of concrete wastewater and a method for wastewater reuse. Background Technology

[0002] In the current concrete industry, the discharge of wastewater (waste slurry) is strictly limited. Due to the instability of solid content in wastewater, it poses a challenge to the concrete mixing process, thus affecting wastewater utilization. Therefore, how to effectively utilize concrete waste slurry has become an urgent industry problem to be solved.

[0003] Concrete wastewater (slurry) mainly originates from the cleaning processes of mixer trucks and pump trucks, the cleaning of the mixing unit, and site washing. After physical treatment such as sand and gravel separation and sedimentation, the main components of the wastewater include fine sand, cement particles, mineral powder slag, admixtures, fly ash, and other solid particles, as well as hydrated ions such as Ca2+, OH-, SO42-, and Na+. These components mainly come from the raw materials used in concrete production, such as cement, sand, and aggregates, as well as admixtures added during production. The solid particles and ionic composition of the wastewater have a direct impact on the performance of concrete.

[0004] Currently, the main treatment methods on the market involve using optical concentration meters for detection, combined with vibratory sand separators, hydrocyclones, fine sand recovery machines, and multiple tanks for wastewater recovery. The specific operating procedures are as follows: The sand and gravel separator washes the mixed waste material, separating the sand and gravel, which is then shoveled to the stockpile for reuse by a loader. The washed slurry flows to a conical tank, is pumped out by a slurry pump, and undergoes secondary filtration via fine sand recovery and a hydrocyclone to separate fine sand and coarse sand. At this point, the slurry concentration has decreased and can be pumped into a storage tank. The storage tank consists of five interconnected structures. Wastewater from the second and third tanks can be used for vehicle washing, and wastewater from the third tank can be used to rinse the screen. The wastewater concentration in the fourth tank is very low. The vehicle washing water and screen rinsing water flow back into the conical tank, undergo fine sand recovery, and are then pumped back into the storage tank for recycling. The last tank in the storage tank is equipped with a concentration detector to maintain the concentration below 0.6%. If the concentration exceeds the standard, water is automatically added to maintain concentration balance. The proportion of slurry used is adjusted according to the daily output and concrete grade. The slurry storage tank is equipped with a drain outlet at the bottom. If the concentration at the bottom of the tank exceeds the standard, it will be automatically discharged and returned to the conical pool. After being filtered by fine sand recovery, it will return to the slurry storage tank again. The entire system operates in a continuous self-circulation manner. When the sewage is insufficient, river water can be added, thereby achieving zero sewage discharge.

[0005] This solution effectively addresses the fundamental issues of wastewater reuse, but its process is relatively complex, requiring the addition of supporting equipment such as sand and gravel separators, hydrocyclones, and fine sand recovery machines. Furthermore, this solution uses optical principles to detect the solid content of concrete wastewater, requiring the solid content to be below 10% and imposing strict requirements on the fine sand content, as fine sand significantly interferes with the optical detection results, affecting the linearity of the output. Compared to existing technologies, this invention employs an ultrasonic wastewater concentration detection device. By emitting ultrasonic pulses into the measured medium, the ultrasonic waves attenuate due to scattering and absorption by sludge and suspended solids as they propagate. The degree of ultrasonic attenuation is related to the concentration of sludge and suspended solids in the liquid; by measuring the attenuation value, the sludge concentration can be calculated. The ultrasonic detection method is unaffected by vibration, sludge temperature, viscosity, or color, effectively solving the problem of insufficient measurement range for solid content detection in existing optical solutions. This invention features a simple process, a straightforward structure, and low cost, while simultaneously achieving the goals of improving wastewater reuse efficiency and reducing the difficulty of concrete preparation. Summary of the Invention

[0006] The purpose of this invention is to provide an automatic control system for adjusting the concentration of concrete wastewater and a method for wastewater reuse.

[0007] This invention has the advantages of being able to accurately and flexibly measure the solid content of concrete wastewater, and the detection method has the characteristics of a large detection range and simple process.

[0008] To address the problems existing in the prior art, this invention discloses an automatic adjustment and control system for concrete wastewater concentration and a wastewater reuse method. By using a wide range of ultrasonic measurements and a self-developed cloud-based control system, the concentration of wastewater in the mixing tank is obtained, thereby effectively realizing the large-scale mixing process of concrete wastewater and significantly improving the mixing efficiency.

[0009] The equipment in the technical solution of this invention includes: a sand and gravel separator; a concrete wastewater concentration measuring device; a wastewater mixing tank (vessel), a mixing device on the mixing tank (vessel), a slurry pump, a wastewater electromagnetic flow meter, and wastewater pipelines installed inside the wastewater mixing tank; a clear water tank (vessel), a clear water pump, a clear water electromagnetic flow meter, and clear water pipelines; a wastewater concentration regulating tank (vessel), a mixing device, a wastewater circulation pump, a circulation pipeline, a level gauge, wastewater pipelines, and valves.

[0010] The wastewater concentration detection device proposed in this invention consists of an ultrasonic sensor, a spray cleaning head (equipped with a switch valve), an overflow trough, and inlet and outlet control valves. The inlet and outlet control valves are connected to a pneumatic butterfly valve and further connected to a submersible pump in the wastewater equalization tank; the ultrasonic concentration meter is installed on one side of the wastewater measuring device, while the overflow trough is located at the upper edge of the device to prevent wastewater from overflowing in the event of a control system malfunction.

[0011] One side of the wastewater mixing tank is connected to the wastewater pipeline of the sand and gravel separator, using gravity to introduce wastewater into the mixing tank. The other side is connected to the wastewater equalization tank via a wastewater pump and an electromagnetic flow meter. A motor is installed above the mixing tank, and the stirring blades are responsible for agitating the wastewater to prevent the sedimentation of suspended solids.

[0012] The clear water tank is used to collect rainwater and river water from the enterprise. One side of it is connected to the sewage equalization tank via a clear water pump and a clear water electromagnetic flow meter.

[0013] The wastewater concentration equalization tank serves as a container for neutralizing and adjusting wastewater and clean water. One side is connected to the wastewater tank, and the other side is connected to the clean water tank. A level gauge is installed above the equalization tank to prevent solution overflow, and a wastewater measuring device is also installed above it. The bottom of the equalization tank is connected to the wastewater equalization tank through a pneumatic butterfly valve, a circulation pump, and circulation pipelines. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the automatic concrete wastewater concentration adjustment system of the present invention. Figure 2 This is a schematic diagram of the concrete wastewater concentration detection device of the present invention. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0016] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0017] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0018] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," etc., should be interpreted broadly. Those skilled in the art can understand the specific meaning of these terms in this invention according to the specific circumstances.

[0019] Combination Figure 1 Structural diagram, and Figure 2 The wastewater measurement device includes the following components: 1-Wastewater mixing tank (reservoir), 2-Agitator on the mixing tank (reservoir), 3-Wastewater pump inside the mixing tank, 4-Wastewater electromagnetic flowmeter, 5-Wastewater pipeline, 6-Clear water tank (reservoir), 7-Clear water pump, 8-Clear water electromagnetic flowmeter, 9-Clear water pipeline, 10-Wastewater concentration regulating tank (reservoir), 11-Agitator, 12-Wastewater circulation pump, 13-Circulation pipeline, 14-Wastewater concentration detection module, 15-Level gauge, 16-Slurry pump, 17-Wastewater pipeline, 18-Valve, 1401-Inlet control valve, 1402-Overflow port, 1403-Sensor, 1404-Spray cleaning nozzle (with on / off valve), 1405-Return control valve. The automatic concrete wastewater concentration adjustment system is characterized in that a mixing device (2) and a wastewater pump (3) are installed in the wastewater mixing tank (1). The wastewater generated during production, the wastewater generated by the pump truck and the mixing truck through the sand and gravel separator are collected to the wastewater mixing tank (1) by gravity potential energy, and then pumped into the wastewater concentration adjustment tank (tank) (10) by the wastewater pump (3) through the pipeline and the wastewater electromagnetic flow meter (4) for metering.

[0020] A water pump (7) is installed in the water tank (6). The water is pumped into the sewage concentration adjustment tank (10) through the pipeline (9) after being metered by the water electromagnetic flow meter (8) by the water pump (7).

[0021] The wastewater concentration regulating tank (tank) (10) is equipped with a stirring device (11) to stir the mixture of wastewater and clean water, thereby making the solution uniform and improving the accuracy of detection. A level gauge (15) is also provided above it to control the liquid level and prevent overflow; a wastewater circulation pump (12) pumps the regulated wastewater into a wastewater measuring device (14), which is located above the wastewater concentration regulating tank (tank) (10). The wastewater measuring device (14) is connected to the wastewater concentration regulating tank (tank) (10) via a pneumatic butterfly valve and a circulation pipeline (13).

[0022] The concrete wastewater concentration detection device is characterized in that: the concentration detection module (14) includes an inlet valve (1401), an overflow port (1402), an ultrasonic sensor (1403), a spray cleaning nozzle (with a switch valve) (1404), and a return valve (1405).

[0023] The core feature of the automatic concrete wastewater concentration adjustment system proposed in this invention is as follows: First, wastewater collected during the production process is gathered in a wastewater mixing tank (or vessel), stirred evenly, and then pumped to a wastewater concentration adjustment (or vessel) tank via a wastewater pump, a wastewater electromagnetic flow meter, and wastewater pipelines. Simultaneously, clean water is pumped from a clean water tank (or vessel) to the wastewater adjustment tank (or vessel) via a clean water pump, a clean water electromagnetic flow meter, and clean water pipelines. Within the wastewater adjustment tank, the concentration is adjusted by regulating the amounts of wastewater and clean water added; the wastewater concentration within the tank is monitored in real-time by a wastewater concentration detection module.

[0024] When the detected concentration value exceeds the set threshold of the cloud control system, the wastewater measuring device will activate the valve and cleaning nozzle to return some wastewater to the wastewater equalization tank and start the clean water pump to reduce the wastewater concentration.

[0025] Conversely, if the detected concentration value is lower than the set threshold of the cloud control system, the wastewater measuring device will also activate the valve and cleaning nozzle to return some wastewater to the wastewater equalization tank and start the wastewater pump to increase the wastewater concentration.

[0026] The volume of sewage or clean water pumped is determined by the difference between the set value and the real-time measured value. This difference, after being calculated by the cloud-based control system, determines the pumping time. There is a positive correlation between the difference and the pumping time.

[0027] The adjustment process is automatically and cyclically executed by the cloud-based control system to ensure that the wastewater concentration value remains stable within the preset range.

[0028] Compared with the prior art, the present invention has the following advantages: 1. This invention proposes an automatic concentration adjustment system for concrete wastewater based on an ultrasonic concentration meter and a wastewater reuse method. This method utilizes ultrasonic detection technology, and its measurement results are unaffected by factors such as vibration, sludge temperature, viscosity, or color. Compared to the insufficient measurement range caused by using optical principles for solid content detection in existing technologies, this invention provides an effective solution.

[0029] 2. This invention further proposes an automatic method for adjusting the concentration of concrete wastewater and for wastewater reuse. This method employs a self-developed cloud-based control system, realizing the entire process of automatic adjustment of wastewater concentration without manual intervention. Furthermore, this invention significantly reduces equipment investment costs by reducing reliance on equipment such as fine sand recovery machines, hydrocyclones, and sand and gravel separators, and by reusing the tank. Therefore, this invention possesses the advantages of low cost, full automation, and simple structure.

[0030] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention are included within the scope of protection of the present invention.

Claims

1. An automatic control system for adjusting the concentration of concrete wastewater, comprising a wastewater mixing tank (vessel), a mixing device on the mixing tank (vessel), a slurry pump, a wastewater electromagnetic flow meter, a wastewater pipeline, a clear water tank (vessel), a clear water pump, a clear water electromagnetic flow meter, a clear water pipeline, a wastewater concentration adjustment tank (vessel), a mixing device, a wastewater circulation pump, a circulation pipeline, a wastewater concentration detection module, a level gauge, a slurry pump, a wastewater pipeline, and valves.

2. The automatic concentration adjustment system for concrete wastewater according to claim 1, characterized in that... The wastewater mixing tank is equipped with a mixing device and a wastewater pump. Wastewater generated during production is collected in the wastewater mixing tank and then pumped into the wastewater concentration regulating tank (tank) through pipelines and a wastewater electromagnetic flow meter.

3. The automatic concentration adjustment system for concrete wastewater according to claim 1, characterized in that... A clean water pump is installed in the clean water tank (reservoir). The clean water is pumped through the clean water pump and then through the clean water electromagnetic flow meter. After being measured, it is pumped into the sewage concentration adjustment tank (reservoir) through the pipeline.

4. The automatic concentration adjustment system for concrete wastewater according to claim 1, characterized in that... The wastewater concentration equalization tank (or reservoir) is equipped with a stirring device to maintain the uniformity of the wastewater solution and improve the accuracy of wastewater concentration measurement. The equalization tank (or reservoir) is also equipped with a level gauge to prevent wastewater overflow in the event of a failure of the cloud-based control system.

5. A wastewater circulation pump is installed on the concentration equalization tank (reservoir), and the wastewater measuring device is located above the wastewater concentration equalization tank (reservoir). The test solution is pumped into the wastewater measuring device through the circulation pipeline by the circulation pump, and returns to the wastewater concentration equalization tank after being detected by the ultrasonic concentration meter.

6. The wastewater measuring device according to claim 4, characterized in that: It includes an inlet valve, an overflow tank, an ultrasonic sensor, a spray cleaning nozzle (with a switch valve), and a return valve.

7. The automatic concentration adjustment system for concrete wastewater according to any one of claims 1-5, characterized in that: First, the wastewater collected from production is collected in a wastewater mixing tank (or tank), and after being mixed evenly, it is pumped into a wastewater concentration regulating tank (or tank) through a slurry pump, a wastewater electromagnetic flow meter, and a wastewater pipeline. Clean water is pumped from a clean water tank (or tank) to the wastewater regulating tank (or tank) through a clean water pump, a clean water electromagnetic flow meter, and a clean water pipeline. The concentration in the wastewater regulating tank is adjusted by adjusting the amount of wastewater and clean water added. The concentration of wastewater in the wastewater regulating tank is detected by a wastewater concentration detection module.

8. When the test result is higher than the set value controlled by the cloud, the wastewater measuring device opens the valve and cleaning nozzle to return the wastewater to the wastewater equalization tank, and then turns on the clean water pump to pump in clean water to reduce the wastewater concentration. When the test result is lower than the set value controlled by the cloud, the wastewater measuring device opens the valve and cleaning nozzle to return the wastewater to the wastewater equalization tank, and then turns on the wastewater pump to pump in wastewater to increase the wastewater concentration. This process is automatically repeated in a cycle controlled by the cloud, keeping the wastewater concentration value within a stable range at all times.

Images