Intelligent zero-discharge drainage method and drainage sedimentation tank using the same

Abstract

The present invention provides an intelligent zero-discharge drainage method, comprising the following steps: S1: setting the maximum water intake depth H of the drainage pump without disturbing the sedimentation area 设 ; S2: The supernatant depth H1 of the first stage of water sedimentation in the metering tank reaches H 设 Time t, the initial sedimentation velocity V of the particles in the pool 沉 =H 设 / t; S3: When the supernatant depth H1 reaches H 设 When the drainage pump starts to work; S4: water outlet speed V 水 =V 沉 ‑A, A is the safety value; S5: the flow rate of the drainage pump Q1=V 水 ×S, S is the sedimentation area of ​​the pool, Q1 during initial operation = (H 设 / t‑A)×S; S6: With time t as the cycle, the supernatant depth of the second stage is monitored as H2, and the particle settling velocity V in the second stage 沉2 =H2 / t, repeat steps S3 to S5 to achieve dynamic control and intelligently control the water output. The present invention also proposes a drainage sedimentation tank using an intelligent zero-discharge drainage method, which has a small footprint and high sedimentation efficiency.

Description

Technical Field

[0001] The invention relates to an intelligent zero-discharge drainage method, belonging to the technical field of sewage treatment. Background Art

[0002] A sedimentation tank is a treatment structure that uses gravity sedimentation to remove suspended particles with a density greater than that of water from water. It is one of the most widely used treatment mechanisms in sewage treatment and can be used for wastewater treatment, post-treatment of biological treatment, and deep treatment.

[0003] Commonly used sedimentation tanks on the market include inclined tube sedimentation tanks, horizontal flow sedimentation tanks, vertical flow sedimentation tanks, radial flow sedimentation tanks, etc. These types of sedimentation tanks all have some problems: the inclined tube sedimentation tank is difficult to maintain and manage, and the inclined tube needs to be replaced after a period of use; the inlet and outlet water distribution of the horizontal flow sedimentation tank is not easy to be uniform, and the sludge discharge is inconvenient; the vertical flow sedimentation tank has a large pool depth, difficult construction, and high cost; the radial flow sedimentation tank occupies a large area, the mechanical sludge discharge equipment is complex, and the construction quality requirements are high. In actual sewage treatment operations, intermittent water inflow and large instantaneous water inflow often occur, which requires a good match for subsequent processes. The above-mentioned commonly used sedimentation tanks are not suitable for this situation, and cannot quickly precipitate and intelligently discharge water to meet the needs of subsequent processes. Traditional sedimentation tanks need to occupy a large area or cost to handle such intermittent water inflow and large instantaneous water inflow, which is low in cost performance and wastes resources. Summary of the invention

[0004] In order to overcome the deficiencies of the prior art, the present invention proposes an intelligent zero-discharge drainage method, which can intelligently control the water discharge to avoid impact disturbance and sedimentation, which would damage the subsequent processes.

[0005] To achieve the above object, an intelligent zero-discharge drainage method of the present invention comprises the following steps:

[0006] S1: Set a fixed value H according to the disturbance depth generated when the drainage pump draws water during normal operation. 设 , H 设 is the maximum value of the undisturbed sedimentation zone;

[0007] S2: After the water inlet is completed, the water in the pool begins to settle and purify, and the first stage supernatant depth H1 in the pool reaches H 设 The initial settling velocity V of the particles in the pool is 沉 =H 设 / t;

[0008] S3: When the supernatant depth H1 reaches H 设 The drainage pump starts working;

[0009] S4: According to V 沉Determine the water outlet velocity V 水 , V 水 =V 沉 -A, A is a safe value;

[0010] S5: According to V 水 Determine the flow rate Q1 of the drainage pump, Q1 = V 水 ×S, S is the sedimentation area of ​​the pool, Q1 during initial operation = (H 设 / tA)×S;

[0011] S6: With time t as the cycle, monitor the supernatant depth of the second stage as H2, and the particle settling velocity V in the second stage 沉2 =H2 / t, repeat steps S3 to S5 to achieve dynamic control.

[0012] Furthermore, the relationship between the safety value A and the supernatant depth H is as follows:

[0013] Supernatant depth H Safety value A <![CDATA[H≥1.2H 设 ]]> 0 <h2 style=";text-align:left;direction:ltr"><![CDATA[1H <h2 style=";text-align:left;direction:ltr"> 设 <h2 style=";text-align:left;direction:ltr"> ≤H<1.2H<h2 style=";text-align:left;direction:ltr"> 设 <h2 style=";text-align:left;direction:ltr"> ]]><h2 style=";text-align:left;direction:ltr"> <![CDATA[(0-5%)V 沉 ]]> <![CDATA[0.8H 设 ≤H<1H 设 ]]> <![CDATA[(5-25%)V 沉 ]]> <h2 style=";text-align:left;direction:ltr"><![CDATA[0.5H <h2 style=";text-align:left;direction:ltr"> 设 <h2 style=";text-align:left;direction:ltr"> ≤H<0.8H<h2 style=";text-align:left;direction:ltr"> 设 <h2 style=";text-align:left;direction:ltr"> ]]><h2 style=";text-align:left;direction:ltr"> <![CDATA[(25-55%)V 沉 <!-- 1 -->]]> <![CDATA[H<0.5H 设 ]]> <![CDATA[(55-85%)V 沉 ]]>

[0014] In the table, H is the real-time depth of the supernatant when the drainage pump starts working.

[0015] The intelligent zero-discharge drainage method of the present invention can intelligently control the water discharge according to the change of the water inlet sedimentation rate, has the characteristics of efficient sedimentation and water discharge, is suitable for drainage at various water levels in the sedimentation tank, and can meet the subsequent process requirements.

[0016] The present invention also proposes a drainage sedimentation tank using an intelligent zero-discharge drainage method, comprising a tank body, a water inlet mechanism being provided at one end of the tank body, a water outlet mechanism being provided at the other end, and a mud discharge mechanism being provided at the bottom of the tank body. The invention is characterized in that the control mechanism is further included, and the control mechanism intelligently controls the water outlet flow rate of the water outlet mechanism according to changes in the sedimentation rate of water particles.

[0017] Furthermore, the water inlet mechanism includes a water inlet pipe and a multi-stage water distribution chamber. The water inlet pipe extends downward in the water distribution chamber close to the inner wall of the pool body. The overflow height of the water distribution chamber decreases step by step in the direction away from the water inlet pipe to form a multi-stage overflow drop structure.

[0018] Furthermore, the water distribution cavity includes a partition, and the water distribution cavity is formed between adjacent partitions. The partition includes a vertical straight section and an overflow section at the top of the straight section. The overflow section is in the form of an arc-shaped water outlet slow flow or a triangular overflow weir.

[0019] Furthermore, the multi-stage water distribution chamber is a semicircular chamber or a square chamber which gradually increases in size in a direction away from the water inlet pipe.

[0020] Furthermore, the bottom end of the water inlet pipe is a slow flow section with a gradually expanding opening.

[0021] Furthermore, the water outlet mechanism includes a pumping device and a liquid level meter. The liquid level meter is used to measure the supernatant depth and water level in the pool body in real time. The pumping device includes a floating part floating on the water surface in the pool body. The floating part is provided with a drainage pump for pumping water. The drainage pump is a variable frequency and adjustable flow water pump.

[0022] Furthermore, a rocker arm is rotatably connected to the inner wall of the pool body, and one end of the rocker arm away from the inner wall of the pool body is rotatably connected to the floating member.

[0023] Furthermore, the bottom of the pool body is bucket-shaped or flat-bottomed, the mud discharge mechanism is air lift mud discharge or special scraper mud discharge, the mud discharge mechanism includes a mud discharge pipe at the lowest point of the bottom of the pool body, and a mud discharge pump is provided at the outer end of the mud discharge pipe.

[0024] The drainage sedimentation tank using the intelligent zero-discharge drainage method of the present invention has the following advantages:

[0025] 1. It can shorten the sedimentation distance of particles in the water body, accelerate the formation of sedimentation, slow down the water flow speed, reduce the height of water flow, and avoid the sludge in the sedimentation area from being washed away;

[0026] 2. In case of intermittent water inflow and large instantaneous water inflow, special water inlet and outlet forms can be used to achieve a smaller footprint and higher cost-effectiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention will be further described and explained below in conjunction with the accompanying drawings.

[0028] Figure 1 It is a cross-sectional view of a drainage sedimentation tank using an intelligent zero-discharge drainage method according to a preferred embodiment of the present invention;

[0029] Figure 2 It is a top view of a drainage sedimentation tank using an intelligent zero-discharge drainage method according to a preferred embodiment of the present invention;

[0030] Figure 3 is a top view of Example 2;

[0031] Figure 4 This is a cross-sectional view of Example 3.

[0032] Figure numerals: 1, tank body; 21, water inlet pipe; 211, slow flow section; 22, water distribution chamber; 23, partition; 231, straight section; 232, overflow section; 31, liquid level meter; 32, floating part; 33, drainage pump; 34, rocker arm; 41, mud discharge pipe; 42, mud discharge pump. DETAILED DESCRIPTION

[0033] The technical solution of the present invention will be more clearly and completely explained below through description of preferred embodiments of the present invention in combination with the accompanying drawings.

[0034] Example 1: Figure 1 and Figure 2 As shown, a drainage sedimentation tank using an intelligent zero-discharge drainage method according to a preferred embodiment of the present invention includes a tank body 1, the tank wall of the tank body 1 is vertical, and the bottom of the tank body 1 is bucket-shaped, which is conducive to the aggregation of particles in the water body. A water inlet mechanism is provided at one end of the tank body 1, and a water outlet mechanism is provided at the other end. A mud discharge mechanism is provided at the bottom of the tank body 1, and the mud discharge mechanism is air lift mud discharge or special scraper mud discharge. A liquid level meter 31 is provided in the tank body 1 for real-time measurement of the supernatant depth in the tank body 1 and the water level in the tank. The liquid level meter 31 adopts infrared or ultrasonic form. It also includes a control mechanism for controlling the water discharge speed of the water discharge mechanism. The control mechanism intelligently controls the water discharge flow rate of the water discharge mechanism according to the change of the water particle sedimentation speed, so as to realize intelligent water discharge and avoid impact and damage to subsequent processes.

[0035] like Figure 1 and Figure 2 As shown, the water inlet mechanism includes a water inlet pipe 21 and three-section water distribution chambers 22. The three-section water distribution chambers 22 are square chambers that gradually increase in size in the direction away from the water inlet pipe 21. The water inlet pipe 21 extends downward in the water distribution chamber 22 close to the inner wall of the pool body 1, and the bottom end of the water inlet pipe 21 is a slow flow section 211 with a gradually increasing opening. The overflow height of the water distribution chamber 22 decreases step by step in the direction away from the water inlet pipe 21 to form a three-section overflow drop structure. The water distribution chamber 22 includes a baffle 23 in the pool body 1, and a water distribution chamber 22 is formed between adjacent baffles 23. The water distribution chamber 22 close to one end of the water inlet pipe 21 is formed between the baffle 23 and the pool wall of the pool body 1. The baffle 23 includes a vertical straight section 231 and an overflow section 232 at the top of the straight section 231. The overflow section 232 is in the form of an arc-shaped water outlet slow flow or a triangular overflow weir. In addition, the overflow area of ​​the overflow section 232 increases step by step, so that the overflow speed gradually decreases.

[0036] like Figure 1 and Figure 2 As shown, the water outlet mechanism includes a pumping device, which includes a floating member 32 floating on the water surface in the pool body 1. A drainage pump 33 for pumping water is provided at the bottom of the floating member 32. The drainage pump 33 is a variable frequency and adjustable flow water pump. A rocker arm 34 is rotatably connected to the inner wall of the pool body 1, and one end of the rocker arm 34 away from the inner wall of the pool body 1 is rotatably connected to the floating member 32. The rocker arm 34 allows the pumping device to move freely up and down with the liquid level, and restricts movement in other directions, so that it remains stable during operation and avoids tilting. The control mechanism controls the operating frequency of the drainage pump 33, thereby realizing the control of the amount of water discharged.

[0037] like Figure 1 and Figure 2 As shown, the mud discharge mechanism includes a mud discharge pipe 41 at the lowest point of the bottom of the pool body 1, and a mud discharge pump 42 is provided at the outer end of the mud discharge pipe 41.

[0038] Example 2: Figure 3 As shown, a drainage sedimentation tank using an intelligent zero-discharge drainage method is different from Example 1 in that the three-stage water distribution chamber 22 is a semicircular chamber that gradually increases in size in the direction away from the water inlet pipe 21.

[0039] Example 3: Figure 4 As shown, a drainage sedimentation tank using an intelligent zero-discharge drainage method is different from Example 1 in that the bottom of the tank body 1 is flat.

[0040] An intelligent zero-discharge drainage method of the present invention comprises the following steps:

[0041] S1: Set a fixed value H according to the disturbance depth generated when the drainage pump draws water during normal operation. 设 , H 设 is the maximum value of the undisturbed sedimentation zone;

[0042] S2: After the water inlet is completed, the water in the pool begins to settle and purify, and the first stage supernatant depth H1 in the pool reaches H 设 The initial settling velocity V of the particles in the pool is 沉 =H 设 / t;

[0043] S3: When the supernatant depth H1 reaches H 设 The drainage pump starts working;

[0044] S4: According to V 沉 Determine the water outlet velocity V 水 , V 水 =V 沉 -A, A is the safety value;

[0045] S5: According to V 水 Determine the flow rate Q1 of the drainage pump, Q1 = V 水 ×S, S is the sedimentation area of ​​the pool, Q1 during initial operation = (H 设 / tA)×S;

[0046] S6: With time t as the cycle, monitor the supernatant depth of the second stage as H2, and the particle settling velocity V in the second stage 沉2 =H2 / t, repeat steps S3 to S5 to achieve dynamic control.

[0047] Among them, the relationship between the safety value A and the supernatant depth H is as follows:

[0048]

[0049]

[0050] Specific implementation process: the water to be treated enters the water distribution chamber 22 from the water inlet pipe 21, and overflows as the water level of the first-stage water distribution chamber 22 gradually rises. The overflow drives the water flow in the water distribution chamber 22 to rise, and the overflow enters the second-stage water distribution chamber 22, and then repeats the above process to enter the third-stage water distribution chamber 22. The water flow path is as follows Figure 1 As shown in ① in the figure. As the overflow area increases step by step, the rising speed of the water flow in each level of water distribution chamber 22 decreases step by step, and the overflow height gradually decreases. The water flows into the tank body 1 from the last level of water distribution chamber 22 and falls without scouring and disturbing the sludge particles at the bottom of the tank. When the water level in the tank body 1 gradually rises, the water inlet drop height can still be maintained at a small level. When the water inlet is completed, the drainage flow of the drainage pump 33 is intelligently controlled by the control mechanism. When the water level reaches the lower limit setting value, that is, the lowest water level value that will not disturb the sludge at the bottom of the tank, it stops running. When the sludge at the bottom of the tank body 1 accumulates to a certain level or runs for a certain period of time, the sludge discharge unit is started to discharge the sludge.

[0051] An intelligent drainage sedimentation tank in the preferred embodiment of the present invention uses a special multi-stage overflow drop water inlet form to reduce disturbance and accelerate the formation of sludge particle precipitation. An intelligent zero-discharge drainage method of the present invention can intelligently control the effluent according to the change of the inlet sedimentation rate, has the characteristics of efficient sedimentation and effluent, is suitable for drainage at various water levels in the sedimentation tank, and can meet the subsequent process requirements.

[0052] The above specific implementations are only descriptions of the preferred implementations of the present invention, and do not limit the protection scope of the present invention. Without departing from the design concept and spirit of the present invention, various modifications, substitutions and improvements made by ordinary technicians in this field to the technical solution of the present invention based on the text description and drawings provided by the present invention should all fall within the protection scope of the present invention. The protection scope of the present invention is determined by the claims.

Claims

1. An intelligent zero-discharge drainage method for a drainage sedimentation tank, the drainage sedimentation tank comprising a tank body, one end of the tank body is provided with a water inlet mechanism, the other end is provided with a water outlet mechanism, and the bottom of the tank body is provided with a mud discharge mechanism, characterized in that: It also includes a control mechanism, which intelligently controls the water flow rate of the water outlet mechanism according to the change of the sedimentation speed of water particles; the water inlet mechanism includes a water inlet pipe and a multi-stage water distribution chamber, the water inlet pipe extends downward in the water distribution chamber close to the inner wall of the pool body, and the overflow height of the water distribution chamber decreases step by step in the direction away from the water inlet pipe to form a multi-stage overflow drop structure; the water distribution chamber includes a partition, and a water distribution chamber is formed between adjacent partitions, the partition includes a vertical straight line segment and an overflow section at the top of the straight line segment, and the overflow section is in the form of an arc-shaped water outlet slow flow or a triangular overflow weir; the water outlet mechanism includes a pumping device and a liquid level gauge, the liquid level gauge is used to measure the supernatant depth and the water level in the pool body in real time, the pumping device includes a floating member floating on the water surface in the pool body, and a drainage pump for pumping water is provided on the floating member, and the drainage pump is a variable frequency adjustable flow water pump; The drainage method comprises the following steps: S1: Set a fixed value H according to the disturbance depth generated when the drainage pump draws water during normal operation. 设 , H 设 is the maximum value of the undisturbed sedimentation zone; S2: After the water inlet is completed, the water in the pool begins to settle and purify, and the first stage supernatant depth H1 in the pool reaches H 设 The initial settling velocity V of the particles in the pool is 沉 =H 设 / t; S3: When the supernatant depth H1 reaches H 设 The drainage pump starts working; S4: According to V 沉 Determine the water outlet velocity V 水 , V 水 =V 沉 -A, A is the safety value; S5: According to V 水 Determine the flow rate Q1 of the drainage pump, Q1=V 水 ×S, S is the sedimentation area of ​​the pool, Q1 during initial operation = (H 设 / tA)×S; S6: With time t as the cycle, monitor the supernatant depth of the second stage as H2, and the particle settling velocity V in the second stage 沉2 =H2 / t, repeat steps S3 to S5 to achieve dynamic control.

2. The intelligent zero-discharge drainage method for a drainage sedimentation tank according to claim 1, characterized in that: The relationship between the safety value A and the supernatant depth H is as follows: ； In the table, H is the real-time depth of the supernatant when the drainage pump starts working.

3. The intelligent zero-discharge drainage method for a drainage sedimentation tank according to claim 1, characterized in that: The multi-stage water distribution chamber is a semicircular chamber or a square chamber that gradually increases in size in the direction away from the water inlet pipe.

4. The intelligent zero-discharge drainage method for a drainage sedimentation tank according to claim 1, characterized in that: The bottom end of the water inlet pipe is a slow flow section with a gradually expanding opening.

5. The intelligent zero-discharge drainage method for a drainage sedimentation tank according to claim 1, characterized in that: A rocker arm is rotatably connected to the inner wall of the pool body, and one end of the rocker arm away from the inner wall of the pool body is rotatably connected to the floating member.

6. The intelligent zero-discharge drainage method for a drainage sedimentation tank according to claim 1, characterized in that: The bottom of the pool body is bucket-shaped or flat-bottomed, the mud discharge mechanism is air lift mud discharge or special scraper mud discharge, the mud discharge mechanism includes a mud discharge pipe at the lowest point of the bottom of the pool body, and a mud discharge pump is provided at the outer end of the mud discharge pipe.

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