Recycling and harmless operation device for reclaimed water and strong brine

Abstract

The utility model discloses a reclaimed water strong brine recycling harmless operation device which comprises a strong brine sedimentation tank, the strong brine sedimentation tank comprises a mixing zone, a reaction zone, a sedimentation / concentration zone and an inclined tube separation zone, the strong brine sedimentation tank is of a rectangular structure, the height of the strong brine sedimentation tank is 3-4m away from the ground, a protective fence is arranged on the upper portion of the strong brine sedimentation tank, and the upper portion of the strong brine sedimentation tank is provided with an inclined tube separation zone. A plurality of additive mixing barrels are arranged at the upper part of the strong brine sedimentation tank, each additive mixing barrel comprises an additive feeding hole, a water injection pipe, a stirring mechanism and a discharging pipe, and a flow control valve is arranged on each discharging pipe. After coking wastewater is treated through the strong brine sedimentation tank, a good foundation is provided for further treatment, and the method is an important key link for recycling and innocent treatment of reclaimed water and strong brine. The auxiliaries are compounded through the auxiliary mixing barrel, the addition amount of the auxiliaries can be adjusted or controlled according to the water quality condition of sewage to be treated, the optimal treatment effect is achieved, and the usage amount of the auxiliaries is saved.

Description

Technical Field

[0001] The utility model belongs to the technical field of sewage treatment, in particular to a harmless operation device for recycling reclaimed and concentrated brine. Background Art

[0002] With the continuous development of heavy industry, the discharge of coking wastewater continues to increase. To prevent serious threats to the ecological environment and protect limited water resources, coking wastewater treatment is essential. Coking plant brine, typically derived from circulating cooling water blowdown and biochemical reclaimed water treatment stations, has a low organic matter content and a high salt content. Saline wastewater is often treated using a combination of pretreatment (flocculation sedimentation, filtration) and a dual-membrane process (ultrafiltration-reverse osmosis). Brine sedimentation tanks are currently the most common method for pretreatment of saline wastewater. The brine sedimentation process builds on the foundations of traditional horizontal flow sedimentation tanks, leveraging the principles of dynamic coagulation, accelerated flocculation, and shallow pond theory to optimize the three processes of coagulation, enhanced flocculation, and inclined tube sedimentation. It has the following advantages: 1) The mixing zone, flocculation zone and sedimentation tank are separated by a rectangular structure to simplify the tank type; 2) A sludge concentration zone is set up at the bottom of the sedimentation and separation zone, which occupies less space; 3) An external sludge circulation is set up between the concentration zone and the mixing part, and part of the concentrated sludge is returned to the mechanical mixing tank by the pump, fully mixed with the raw water and coagulant, and formed into a high-concentration mixed floc through mechanical flocculation, and then enters the sedimentation zone for separation.

[0003] When adding coagulants and flocculants to the concentrated brine sedimentation tank, the coagulant is generally added directly into the mixing tank, and the flocculant is added in the reaction zone. The operators directly add the coagulant and flocculant manually. When adding, the metering is inaccurate and the amount of coagulant or flocculant cannot be adjusted in real time according to the water quality. Utility Model Content

[0004] In order to solve the above problems, the utility model provides a harmless operation device for resource utilization of reclaimed water and concentrated brine.

[0005] The utility model is realized as follows: a reclaimed water and concentrated brine resource-based harmless operation device comprises a concentrated brine sedimentation tank, wherein the concentrated brine sedimentation tank comprises a mixing zone, a reaction zone, a precipitation / concentration zone and an inclined tube separation zone.

[0006] The mixing area adopts a rapid mixing tank, and the added flocculant is quickly mixed by a rapid mixer.

[0007] The reaction area is divided into two parts: one is a rapid coagulation stirring reaction tank, and the other is a slow coagulation plug flow reaction tank.

[0008] Rapid coagulation and agitation reaction tank: Raw water is introduced into the center of the reaction tank floor. An impeller is located within a central, steady-flow cylinder. The impeller's function is to evenly mix the water flow within the reaction tank and provide the necessary kinetic energy for flocculation and polyelectrolyte distribution. An appropriate amount of coagulant is added to this area, and an impeller agitator is used for uniform mixing. Simultaneously, sludge is circulated to achieve an optimal solids concentration. The amount of coagulant is determined based on water quality. To maintain an optimal concentration of suspended flocculent or crystalline solid particles in the reaction tank, the external recirculation system for concentrated sludge from the sludge concentration area is adjusted to ensure sludge concentration within the tank.

[0009] Slow coagulation plug-flow reactor: Its function is to produce sweeping flocculation to obtain larger flocs, enabling rapid sedimentation in the settling zone. This results in a large, high-density, homogeneous floc throughout the reactor, meeting the initial design requirements. The settling zone should be operated at a much higher speed than the rest of the system to achieve a high floc density. Sedimentation and concentration zone: Flocs flow slowly from a large settling zone into the clarification zone. This prevents floc damage and vortex formation, ensuring uniform deposition of a large number of suspended solids within this zone. Flocs collect and concentrate in the lower portion of the clarifier. The concentration zone is divided into two layers: one above the sludge hopper and one below. The upper layer concentrates the recycled sludge. The sludge resides in this layer for several hours before being discharged into the sludge hopper. A portion of the concentrated sludge is discharged from the concentration zone by a sludge pump and circulated to the reactor inlet. The lower layer collects the remaining concentrated sludge. A sludge pump extracts excess sludge from the bottom of the hopper and delivers it to a sludge dewatering room or an existing drainage network, sewage pipe, or canal capable of handling high-concentration sludge water. The sludge concentration area is equipped with an ultrasonic level control switch to control the sludge pump, ensuring the concentrated sludge layer remains within a controlled range and ensuring the proper operation of the concentration tank. The inclined tube separation area uses a countercurrent inclined tube settling zone to settle the remaining alum flocs. Hydraulic distribution is achieved through longitudinal plates fixed to the underside of the clear water collection tank. Clarified water is recovered by a sump system. The clarified water undergoes dual-membrane treatment (ultrafiltration-reverse osmosis) and can be directly discharged to meet standards or recycled within the plant. Flocs accumulate in the lower portion of the clarifier, where the resulting sludge is also concentrated. The sludge is collected by a scraper and transferred to the hopper in the sludge concentration area.

[0010] The concentrated brine sedimentation tank is a rectangular structure with a height of 3-4 meters from the ground. A guardrail is provided on the upper part of the concentrated brine sedimentation tank to ensure the safety of personnel on the upper part of the concentrated brine sedimentation tank. Several auxiliary agent mixing barrels are provided on the upper part of the concentrated brine sedimentation tank. The auxiliary agent mixing barrels include an auxiliary agent feeding port, a water injection pipe, a stirring mechanism and a discharge pipe. The discharge pipe is provided with a flow control valve.

[0011] Furthermore, a liquid level gauge is provided on the additive mixing barrel.

[0012] The auxiliary agent mixing barrel is fixed on a bracket, and the bracket is fixed above the partition wall of the mixing zone and the reaction zone.

[0013] When treating coking wastewater in a concentrated brine sedimentation tank, first add the coagulant or flocculant (or coagulant aid) to the additive mixing tank. Then, add the appropriate amount of raw water according to the formulation requirements. The compounded coagulant or flocculant (or coagulant aid) is then added to the mixing zone or reaction zone. A flow control valve can be used to adjust or control the amount of additive added based on the water quality of the wastewater to achieve optimal treatment results.

[0014] The discharge pipe of the additive mixing barrel is connected to the injection pipe through a hose. The injection pipe is provided with an injection hole. The upper part of the additive mixing barrel is connected to a compressed air pipe. The compressed air pipe is provided with a regulating valve to adjust the pressure in the additive barrel.

[0015] When in use, the spray tube can be placed in the mixing tank or reaction tank. Under the action of compressed air, the additive is evenly sprayed into the mixing tank or reaction tank through the spray tube, which assists the stirring effect and makes the additive work better.

[0016] The beneficial effects of the present invention are as follows: the present invention has a reasonable structural design. 1. After the coking wastewater is treated in the concentrated brine sedimentation tank, a good foundation is provided for further treatment, which is an important and key link in the resource-based and harmless treatment of reclaimed water and concentrated brine. 2. The additives are compounded in the additive mixing tank, and the amount of additives added can be adjusted or controlled according to the water quality of the wastewater to be treated to achieve the best treatment effect, while saving the amount of additives used. 3. The additives are sprayed more evenly into the mixing tank or reaction tank through the injection pipe, so that the additives can play a better role. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of the auxiliary agent mixing barrel of the utility model;

[0018] Figure 2 This is a schematic structural diagram of a concentrated brine sedimentation tank of the present utility model;

[0019] In the figure: 1-mixing zone, 2-rapid coagulation stirring reaction tank, 3-slow coagulation stirring reaction tank, 4-fast mixer, 5-impeller mixing drum, 6-inclined pipe, 7-clean water accumulation area, 8-sludge scraper, 9-sludge pump, 10-guardrail, 11-additive mixing barrel, 1101-feeding port, 1102-water injection pipe, 1103-stirring mechanism, 1104-discharge pipe, 1105-flow control valve, 1106-liquid level meter, 1107-bracket, 1108-hose, 1109-injection pipe, 1110-injection hole, 1111-compressed air pipe, 1112-regulating valve. DETAILED DESCRIPTION

[0020] In order to more clearly understand the technical solution of the present invention, the present invention is further described below with reference to the accompanying drawings.

[0021] like Figure 1-2 The illustrated device for the harmless recycling of reclaimed brine includes a brine sedimentation tank, which comprises a mixing zone 1, a reaction zone, a sedimentation / concentration zone, and an inclined tube separation zone. The mixing zone utilizes a rapid mixing tank, where a rapid agitator 4 rapidly mixes the added flocculant. The reaction zone is divided into two sections: a rapid coagulation and stirring reaction tank 2 and a slow coagulation and plug flow reaction tank 3.

[0022] Rapid coagulation and agitation reaction tank: Raw water is introduced into the center of the reaction tank floor. An impeller is located within a central, steady-flow cylinder, as shown in Figure 5. This impeller ensures uniform mixing of the water flow within the reaction tank and provides the necessary kinetic energy for flocculation and polyelectrolyte distribution. An appropriate amount of coagulant is added to this zone, and an impeller mixer is used to achieve uniform mixing. Simultaneously, sludge is circulated to achieve an optimal solids concentration. The amount of coagulant is determined based on water quality. To maintain an optimal concentration of suspended flocculent or crystalline solid particles in the reaction tank, an external recirculation system for concentrated sludge from the sludge thickening zone is adjusted to maintain the desired sludge concentration. Slow coagulation and plug-flow reaction tank 3: This tank produces sweeping flocculation to produce larger flocs, enabling rapid settling in the sedimentation zone. This results in a large number of dense, homogeneous flocs throughout the entire reaction tank, meeting the initial design requirements. The sedimentation zone should be significantly faster than the rest of the system to achieve a high density of flocs. Sedimentation and Concentration Zone: Alum flocs slowly flow from a large settling zone into the clarification zone, avoiding damage to the flocs or the creation of vortices, ensuring uniform deposition of large quantities of suspended solids. The alum flocs collect and concentrate in the lower part of the clarifier. The concentration zone is divided into two layers: one above the sludge hopper and one below. The upper layer concentrates the recycled sludge, where it remains for several hours before being discharged into the sludge hopper. Part of the concentrated sludge is discharged from the concentration zone by a sludge pump and circulated by sludge pump 9 to the inlet of the reaction tank. The lower layer collects the remaining concentrated sludge. The remaining sludge is pumped from the bottom of the hopper by sludge pump 9 and sent to a sludge dewatering room or an existing drainage network or sewage pipe or canal capable of handling high-concentration sludge water. The sludge concentration zone is equipped with an ultrasonic mud level control switch to control the operation of the sludge pump, ensuring that the concentrated sludge layer remains within a controlled range and that the concentration tank operates properly. The inclined tube separation area uses a countercurrent inclined tube settling zone to precipitate the remaining alum flocs. This zone is equipped with inclined tubes 6. Hydraulic distribution is achieved via longitudinal plates fixed to the underside of the clear water collection tank. Clarified water is recovered by a sump system. Clarified water from the clear water accumulation area 7 undergoes dual-membrane treatment (ultrafiltration-reverse osmosis) and can be directly discharged to meet standards or recycled within the plant. Flocculants accumulate in the lower portion of the clarifier, where the resulting sludge is concentrated. The sludge is collected by scraper 8 and transferred to the sludge hopper in the sludge concentration area.

[0023] The concentrated brine sedimentation tank is a rectangular structure with a height of 3-4 meters from the ground. A guardrail 10 is provided on the upper part of the concentrated brine sedimentation tank. Several auxiliary agent mixing barrels 11 are provided on the upper part of the concentrated brine sedimentation tank. The auxiliary agent mixing barrels 11 include an auxiliary agent feeding port 1101, a water injection pipe 1102, a stirring mechanism 1103 and a discharge pipe 1104. The discharge pipe is provided with a flow control valve 1105. The auxiliary agent mixing barrel 11 is provided with a liquid level meter 1106, which is convenient for observing the liquid amount in the auxiliary agent mixing barrel and is also conducive to controlling the amount of raw water added. The raw water can be clarified water from the clear water accumulation area 7. The auxiliary agent mixing barrel 11 is fixed on a bracket 1107, and the bracket is fixed above the partition wall of the mixing zone and the reaction zone to facilitate the addition of auxiliary agents and the installation and use of the auxiliary agent mixing barrel. The discharge pipe 1104 of the additive mixing barrel is connected to the injection pipe 1109 through a hose 1108. The injection pipe 1109 is provided with an injection hole 1110. The upper part of the additive mixing barrel is connected to a compressed air pipe 1111. The compressed air pipe is provided with a regulating valve 1112 to adjust the pressure in the additive barrel.

[0024] When in use, the spray tube 1109 can be placed in the mixing tank or the reaction tank. Under the action of compressed air, the additive is evenly sprayed into the mixing tank or the reaction tank through the spray tube 1109. The auxiliary stirring effect makes the additive work better.

[0025] The above description is only a preferred embodiment of the present invention. Therefore, any equivalent changes or modifications made according to the structure, features and principles described in the scope of the present invention patent application are included in the scope of the present invention patent application.

Claims

1. A device for resource-based and harmless operation of reclaimed water and concentrated brine, comprising a concentrated brine sedimentation tank, wherein the concentrated brine sedimentation tank comprises a mixing zone, a reaction zone, a precipitation / concentration zone, and an inclined tube separation zone. The mixing zone adopts a rapid mixing tank, and the added flocculant is rapidly mixed by a rapid stirrer. The reaction zone is divided into two parts: one is a rapid coagulation stirring reaction tank, and the other is a slow coagulation plug flow reaction tank, characterized in that: The concentrated brine sedimentation tank is a rectangular structure with a height of 3-4 meters from the ground. A guardrail is provided on the upper part of the concentrated brine sedimentation tank. Several auxiliary agent mixing barrels are provided on the upper part of the concentrated brine sedimentation tank. The auxiliary agent mixing barrels include an auxiliary agent feeding port, a water injection pipe, a stirring mechanism and a discharge pipe. The discharge pipe is provided with a flow control valve.

2. The harmless operation device for recycling and recovering reclaimed and concentrated brine according to claim 1 is characterized in that: Furthermore, a liquid level gauge is provided on the additive mixing barrel.

3. The harmless operation device for recycling and recycling reclaimed water and concentrated brine according to claim 1 is characterized in that: The auxiliary agent mixing barrel is fixed on a bracket, and the bracket is fixed above the partition wall of the mixing zone and the reaction zone.

4. The harmless operation device for recycling and recycling reclaimed water and concentrated brine according to claim 1 is characterized in that: The discharge pipe of the additive mixing barrel is connected to the injection pipe through a hose. The injection pipe is provided with an injection hole. The upper part of the additive mixing barrel is connected to a compressed air pipe. The compressed air pipe is provided with a regulating valve to adjust the pressure in the additive barrel.

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