Chromium-containing wastewater treatment device

Abstract

The chromium-containing wastewater treatment device comprises a device main body, the device main body comprises a raw water tank, a reaction tank, a sedimentation tank, a rotary ceramic membrane device, a clean water tank and a concentrated water tank, and a raw water pump is arranged in the raw water tank; the reaction tank is provided with two sets of reaction dosing devices, a reaction stirring device, a reaction online control device and a reaction reflux pipeline, and a reaction circulating pump is arranged on the reaction reflux pipeline; the sedimentation tank is provided with three sets of sedimentation dosing devices, a sedimentation stirring device, a sedimentation online control device and a sedimentation reflux pipeline; a sedimentation circulating pump is arranged on the sedimentation circulating pipeline; the rotary ceramic membrane device comprises a rotary ceramic membrane assembly, a water producing pipe and a concentrated water pipe. The advantages of the membrane separation device are fully utilized, the automation degree is high, the membrane cleaning operation is simple, the management is easy, and meanwhile, the membrane separation device occupies a small area. The whole device is high in wastewater treatment speed, good in wastewater treatment effect and suitable for treatment of industrial chromium-containing wastewater.

Description

TECHNICAL FIELD

[0001] The utility model belongs to wastewater treatment field, concretely is a kind of chromium-containing wastewater treatment device. BACKGROUND

[0002] In the production process of silicon steel, a layer of insulating paint is needed to be coated on the surface of cold-rolled strip steel, and the insulating paint is divided into chromium-containing paint and chromium-free environmental protection paint. From the current market, the performance of chromium-containing paint is more superior, and it occupies most of the market. A large amount of chromium-containing wastewater, mainly containing hexavalent chromium and trivalent chromium, is generated in the production and use of chromium-containing paint, and hexavalent chromium is more harmful to human beings and the environment, about one hundred times of trivalent chromium. These chromium-containing wastewater must be treated before being discharged into the environment, and the main method for treating chromium-containing wastewater in China at present is reduction precipitation method. Its basic steps can be roughly divided into: first, add acid to adjust the pH of chromium-containing wastewater to 2-3, and add reducing agent to the solution to reduce hexavalent chromium to trivalent chromium; second, add alkali to adjust the pH of the solution to weak alkaline (generally 8-9) to promote trivalent chromium to form chromium hydroxide precipitate. Third, add polyaluminum chloride (PAC) and polyacrylamide (PAM) to the precipitate solution to further flocculate the impurities in the water and achieve stratification. Fourth, through aeration, the flocs are stirred evenly, and then through plate and frame filtration, so that the chromium hydroxide (filter mud) and salt solution (plate and frame filtrate) are separated, and the wastewater is discharged to meet the standard. However, the problem of this method is that the plate and frame filtration has low degree of automation, and a large amount of filter mud is generated during operation, which causes difficulty in cleaning the plate and frame, and consumes time and effort. CONTENT OF THE UTILITY MODEL

[0003] In view of the above, the utility model provides a chromium-containing wastewater treatment device to solve the problems raised in the background art.

[0004] The utility model discloses a technical scheme that solves its technical problem is: a chromium-containing wastewater treatment device, including device main part, its characterized in that: device main part includes raw water tank, reaction pool, sedimentation tank, rotary ceramic membrane device, clean water pool, thick water pool, and raw water tank, reaction pool, sedimentation tank, rotary ceramic membrane device are sequentially communicated through pipeline between them, and rotary ceramic membrane device is communicated with clean water pool and thick water pool through pipeline respectively, and clean water pool is communicated with raw water tank through pipeline again, be equipped with the raw water pump that draws the chromium-containing wastewater to the raw water tank in, reaction pool has two sets of reaction dosing device, reaction stirring device, reaction on -line control device, reaction backflow pipeline, and both ends of reaction backflow pipeline are communicated with reaction pool, is equipped with reaction circulating pump on reaction backflow pipeline, reaction dosing device and reaction stirring device all are located above reaction pool, and reaction dosing device and reaction on -line control device are electrically connected, sedimentation tank has three sets of sedimentation dosing device, sedimentation stirring device, sedimentation on -line control device, sedimentation backflow pipeline, and both ends of sedimentation backflow pipeline are communicated with reaction pool, is equipped with sedimentation circulating pump on sedimentation circulating pipeline, sedimentation dosing device and sedimentation stirring device all are located above sedimentation tank, and sedimentation dosing device and sedimentation on -line control device are electrically connected, rotary ceramic membrane device includes rotary ceramic membrane assembly, water production pipe, thick water pipe, and one end of water production pipe and thick water pipe is communicated with rotary ceramic membrane assembly, and the other end of water production pipe is communicated with clean water pool, and the other end of thick water pipe is communicated with thick water pool.

[0005] Further, the two sets of reaction dosing devices of the reaction pool include an acid adjusting dosing device and a reducing agent dosing device, and both of the two sets of reaction dosing devices include a reaction dosing box and a reaction dosing pump.

[0006] Further, the three sets of sedimentation dosing devices of the sedimentation tank include an alkali adjusting dosing device, a polyaluminum chloride (PAC) dosing device and a polyacrylamide (PAM) dosing device, and all of the three sets of sedimentation dosing devices include a sedimentation dosing box and a sedimentation dosing pump.

[0007] Further, the rotary ceramic membrane assembly includes a rotary ceramic membrane, a hollow shaft and a pressure container.

[0008] Further, the raw water tank, the reaction pool, the sedimentation tank, the rotary ceramic membrane device, the clean water pool and the thick water pool are all provided with a water inlet and a water outlet, and the pipelines between the raw water tank, the reaction pool, the sedimentation tank, the rotary ceramic membrane device, the clean water pool and the thick water pool are communicated through the water inlet or the water outlet.

[0009] Further, a booster pump is arranged on a connecting pipeline between the sedimentation tank and the rotary ceramic membrane device, and the effluent of the sedimentation tank enters the rotary ceramic membrane device for solid-liquid separation through the booster pump.

[0010] Further, the device main body further comprises a liquid crystal panel, the liquid crystal panel is internally provided with a microcontroller, an input end of the liquid crystal panel is connected with an input end of the microcontroller, and output ends of the microcontroller are electrically connected with the reaction dosing device, the reaction stirring device, the reaction online control device, the reaction circulating pump, the sedimentation dosing device, the sedimentation stirring device, the sedimentation online control device and the sedimentation circulating pump.

[0011] Further, the device main body is provided with a power line connected with an external power source, the power line is electrically connected with the liquid crystal panel, and the device main body is provided with electric energy through the power line connected with the external power source.

[0012] The beneficial effects of the present application are as follows: the present application makes full use of the advantages of the membrane separation device, has high automation degree, simple membrane cleaning operation, is easy to manage, and the membrane separation device has small floor area. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is a principle schematic view of the present application.

[0014] In Figure 1 , 1, raw water tank; 2, reaction tank; 3, sedimentation tank; 4, rotary ceramic membrane device; 5, clean water tank; 6, concentrated water tank; 7, raw water pump; 8, acid adjusting and dosing device; 9, reducing agent dosing device; 10, reaction stirring device; 11, reaction backflow pipeline; 12, reaction online control device; 13, reaction circulating pump; 14, alkali adjusting and dosing device; 15, polyaluminum chloride (PAC) dosing device; 16, polyacrylamide (PAM) dosing device; 17, sedimentation stirring device; 18, sedimentation backflow pipeline; 19, sedimentation online control device; 20, sedimentation circulating pump; 21, booster pump; 22, rotary ceramic membrane assembly; 23, water production pipeline; 24, concentrated water pipeline. DETAILED DESCRIPTION

[0015] The present application will be further described below in combination with the drawings and some embodiments.

[0016] In Figure 1The application discloses a chromium-containing wastewater treatment device, which comprises a device main body, wherein the device main body comprises a raw water tank 1, a reaction tank 2, a sedimentation tank 3, a rotary ceramic membrane device 4, a clean water tank 5 and a concentrated water tank 6; the raw water tank 1, the reaction tank 2 and the sedimentation tank 3 are sequentially connected through pipelines; the rotary ceramic membrane device 4 is connected with the clean water tank 5 and the concentrated water tank 6 through pipelines; the clean water tank 5 is connected with the raw water tank 1 through a pipeline; the raw water tank 1 is provided with a raw water pump 7 for pumping chromium-containing wastewater into the reaction tank 2; and the chromium-containing wastewater in the raw water tank 1 is firstly pumped into the reaction tank 2 through the raw water pump 7.

[0017] The reaction tank 2 is provided with two sets of reaction dosing devices, a reaction stirring device 10, a reaction online control device 12 and a reaction backflow pipeline 11; the reaction stirring device 10 is a common stirrer device, for example, a ZY-HM20 model or a H2010G model stirrer; the two ends of the reaction backflow pipeline 11 are connected with the reaction tank 2; the inlet end of the reaction backflow pipeline 11 is connected with the bottom end of the reaction tank 2; the outlet end of the reaction backflow pipeline 11 is connected with the upper end of the reaction tank 2; the reaction backflow pipeline 11 is provided with a reaction circulating pump 13; the reaction dosing devices and the reaction stirring device 10 are located above the reaction tank 2; the reaction dosing devices are electrically connected with the reaction online control device 12; the reaction online control device 12 controls the dosing amount of the reaction dosing devices; the reaction stirring device 10 stirs the liquid in the reaction tank 2, so that the medicament and the wastewater are fully mixed; when the liquid in the reaction tank 2 does not reach a set value, the reaction circulating pump 13 on the reaction backflow pipeline 11 continuously circulates until the set value is reached.

[0018] The sedimentation tank 3 is provided with three sets of sedimentation dosing devices, a sedimentation stirring device 17, a sedimentation online control device 19 and a sedimentation backflow pipeline 18; the sedimentation stirring device 17 is a common stirrer device, for example, a ZY-HM20 model or a H2010G model stirrer; the two ends of the sedimentation backflow pipeline 18 are connected with the reaction tank 2; the inlet end of the sedimentation backflow pipeline 18 is connected with the bottom end of the sedimentation tank 3; the outlet end of the sedimentation backflow pipeline 18 is connected with the upper end of the sedimentation tank 3; the sedimentation backflow pipeline 18 is provided with a sedimentation circulating pump 20; the sedimentation dosing devices and the sedimentation stirring device 17 are located above the sedimentation tank 3; the sedimentation dosing devices are electrically connected with the sedimentation online control device 19; the sedimentation online control device 19 controls the dosing amount of the sedimentation dosing devices; the sedimentation stirring device 17 stirs the liquid in the sedimentation tank 3, so that the medicament and the wastewater are fully mixed; when the liquid in the sedimentation tank 3 does not reach a set value, the sedimentation circulating pump 20 on the sedimentation backflow pipeline 18 continuously circulates until the set value is reached.

[0019] The rotating ceramic membrane device 4 includes a rotating ceramic membrane assembly 22, a water production pipe 23, a concentrated water pipe 24, one end of the water production pipe 23 and one end of the concentrated water pipe 24 are communicated with the rotating ceramic membrane assembly 22, the other end of the water production pipe 23 is communicated with the clean water tank 5, the other end of the concentrated water pipe 24 is communicated with the concentrated water tank 6, the effluent of the sedimentation tank 3 enters the rotating ceramic membrane device 4 for solid-liquid separation through the booster pump 21, removes various solid particles in the wastewater, realizes the removal of chromium heavy metal pollutants, and the produced clean water enters the clean water tank 5, the produced concentrated water enters the concentrated water tank 6 for concentration, the clean water produced by the clean water tank 5 can be used for cleaning of the raw water tank 1, the reaction tank 2, the sedimentation tank 3, the rotating ceramic membrane device 4 and the concentrated water tank 6, and a circulating pump can be installed on the pipeline between the clean water tank 5 and the raw water tank 1.

[0020] In the embodiment, the two sets of reaction dosing devices of the reaction tank 2 include an acid adjusting dosing device 8 and a reducing agent dosing device 9, and both of the two sets of reaction dosing devices include a reaction dosing box and a reaction dosing pump, the reaction online control device 12 includes a reaction pH online detection instrument and an ORP online detection instrument, the reaction online control device 12 controls the start and stop of the reaction dosing pump by measuring the pH and ORP, the reaction circulating pump 13 draws out the water in the reaction tank 2 to pass through the reaction online control device 12 to detect the pH value, stops adding acid after the pH value reaches the set range, and starts the reducing agent dosing device 9, stops the reaction dosing pump after reaching the set ORP range, and reacts for 20-30 minutes, so that the wastewater in the reaction tank 2 is subjected to a reduction reaction under acidic conditions, and the chromium-containing wastewater is reduced from hexavalent chromium to trivalent chromium under acidic conditions by the reducing agent.

[0021] In the embodiment, the three sets of sedimentation dosing devices of the sedimentation tank 3 include an alkali adjusting dosing device 14, a polyaluminum chloride (PAC) dosing device 15 and a polyacrylamide (PAM) dosing device 16, and the three sets of sedimentation dosing devices all include a sedimentation dosing box and a sedimentation dosing pump, the sedimentation online control device 19 includes a sedimentation pH online detection instrument, the sedimentation online control device 19 controls the start and stop of the sedimentation dosing pump by measuring the pH, the effluent of the reaction tank 2 enters the sedimentation tank 3 to perform alkali adjusting flocculation and sedimentation, the reaction conditions are controlled by the sedimentation circulating pump 20 to perform the reaction in the set pH range, the trivalent chromium ions are first generated into chromium hydroxide precipitate under the action of alkali, and the chromium hydroxide precipitate is flocculated under the action of PAC and PAM.

[0022] In the embodiment, the rotating ceramic membrane assembly 22 includes a rotating ceramic membrane, a hollow shaft and a pressure container, the main function of the rotating ceramic membrane assembly 22 is to remove the filter layer on the membrane surface by dynamic operation, utilize the centrifugal force, hydraulic shear force and strong turbulence of the filtrate, and realize continuous and stable filtration.

[0023] In the embodiment, the raw water tank 1, the reaction tank 2, the sedimentation tank 3, the rotary ceramic membrane device 4, the clean water tank 5 and the concentrated water tank 6 are all provided with water inlets and water outlets, and the pipelines between the raw water tank 1, the reaction tank 2, the sedimentation tank 3, the rotary ceramic membrane device 4, the clean water tank 5 and the concentrated water tank 6 are connected through the water inlets or the water outlets.

[0024] In the embodiment, a booster pump 21 is arranged on the connecting pipeline between the sedimentation tank 3 and the rotary ceramic membrane device 4, and the water outlet of the sedimentation tank 3 enters the rotary ceramic membrane device 4 for solid-liquid separation through the booster pump 21.

[0025] In the embodiment, the device main body further comprises a liquid crystal panel, the liquid crystal panel is internally provided with a microcontroller, an input end of the liquid crystal panel is connected with an input end of the microcontroller, and an output end of the microcontroller is electrically connected with the reaction dosing device, the reaction stirring device 10, the reaction online control device 12, the reaction circulating pump 13, the sedimentation dosing device, the sedimentation stirring device 17, the sedimentation online control device 19 and the sedimentation circulating pump 20.

[0026] In the embodiment, the reaction circulating pump 13 and the sedimentation circulating pump 20 are common circulating pump devices, such as DC30 series and DC40 series circulating pump devices.

[0027] In the embodiment, the booster pump 21 is a common booster pump device, such as a CHLF / CDMF full-automatic variable frequency constant pressure water pump and a CWS-VI integrated constant pressure variable frequency water pump.

[0028] In the embodiment, the device main body is provided with a power line connected with an external power source, the power line is electrically connected with the liquid crystal panel, and the external power source is connected through the power line to provide electric energy for the device main body.

[0029] In the embodiment, the control circuit of the device is a common circuit in the field of circuits, the device can be connected with an external power source through a power line or be provided with a built-in battery to provide electric energy for the device, and the skilled in the art can realize the device without further description.

[0030] The utility model discloses in the specific implementation time: when using, through the power cord connection external power supply provides the electric energy for device main part, through liquid crystal panel control device main part, in the whole process microcontroller receives and transmission sends signal, its work flow is: the raw water tank 1 contains chromium waste water first through raw water pump 7 and is drawn to the reaction pool 2, and opens reaction stirring device 10 and adjusts acid and dosing device 8, and reaction circulating pump 13 draws out the water in reaction pool 2 through reaction on -line control device 12, detects pH value, and stops adding acid after reaching the set range, and opens reducing agent dosing device 9, reaches the set ORP range, stops reaction dosing pump, and reaction 20~30 minutes, and the waste water in reaction pool 2 carries out reduction reaction under acidic condition, and the chromium-containing waste water is reduced from hexavalent chromium to trivalent chromium under acidic condition by reducing agent;The effluent of reaction pool 2 enters the sedimentation tank 3 and carries out adjusting alkali flocculation sedimentation, utilizes the control reaction condition in the set pH range and carries out the reaction by sedimentation circulating pump 20 etc., and trivalent chromium ion is first generated under the action of hydroxide under the action of alkali, and the hydroxide is generated under the action of PAC and PAM and produces flocculation;The effluent of sedimentation tank 3 passes through booster pump 21 and enters rotary ceramic membrane device 4 and carries out solid-liquid separation, removes various solid particles in waste water, realizes the removal of chromium heavy metal pollutants, and the produced clear water enters clear water tank 5, and the produced thick water enters thick water tank 6 and concentrates, and the clear water produced in clear water tank 5 can be used for the cleaning of raw water tank 1, reaction pool 2, sedimentation tank 3, rotary ceramic membrane device 4 and thick water tank 6.

[0031] It is worth mentioning that: in the description of the utility model, the meaning of "multiple" is two or more than two, unless otherwise explicitly specified. In the utility model, unless otherwise explicitly specified and limited, the terms "installation", "connection", "connection", "fixing" and other terms should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected, it can be mechanically connected, and those skilled in the art can understand the specific meaning of the above-mentioned terms in the utility model according to the specific situation.

[0032] For those skilled in the art, it is obvious that the utility model patent is not limited to the details of the above-mentioned exemplary embodiments, and the utility model patent can be realized in other specific forms without departing from the spirit or basic characteristics of the utility model patent. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, and the scope of the utility model patent is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the essential elements of the claims are intended to be included in the utility model patent. Any reference signs in the claims should not be regarded as limiting the claims involved.

Claims

1. A chromium-containing wastewater treatment apparatus comprising an apparatus body, characterised in that: The device body comprises a raw water tank, a reaction tank, a sedimentation tank, a rotating ceramic membrane device, a clean water tank and a concentrated water tank, the raw water tank, the reaction tank, the sedimentation tank and the rotating ceramic membrane device are sequentially connected by pipelines, the rotating ceramic membrane device is connected with the clean water tank and the concentrated water tank respectively, the clean water tank is connected with the raw water tank by a pipeline, and the raw water tank is provided with a raw water pump for pumping the chromium wastewater into the reaction tank; The reaction tank is provided with two sets of reaction dosing devices, a reaction stirring device, a reaction online control device and a reaction backflow pipeline, both ends of the reaction backflow pipeline are connected with the reaction tank, a reaction circulating pump is arranged on the reaction backflow pipeline, the reaction dosing devices and the reaction stirring device are arranged above the reaction tank, and the reaction dosing devices are electrically connected with the reaction online control device; The sedimentation tank is provided with three sets of sedimentation dosing devices, a sedimentation stirring device, a sedimentation online control device and a sedimentation backflow pipeline, both ends of the sedimentation backflow pipeline are connected with the reaction tank, a sedimentation circulating pump is arranged on the sedimentation backflow pipeline, the sedimentation dosing devices and the sedimentation stirring device are arranged above the sedimentation tank, and the sedimentation dosing devices are electrically connected with the sedimentation online control device; The rotating ceramic membrane device comprises a rotating ceramic membrane assembly, a water production pipeline and a concentrated water pipeline, one end of the water production pipeline and one end of the concentrated water pipeline are connected with the rotating ceramic membrane assembly, the other end of the water production pipeline is connected with the clean water tank, and the other end of the concentrated water pipeline is connected with the concentrated water tank.

2. A chromium-containing wastewater treatment device according to claim 1, characterized in that: The reaction dosing devices of the reaction tank comprise acid adjusting dosing devices and reducing agent dosing devices, the reaction dosing devices all comprise reaction dosing boxes and reaction dosing pumps, and the reaction online control device comprises a reaction pH online detection instrument and an ORP online detection instrument.

3. A chromium-containing wastewater treatment device according to claim 1, characterized in that: The sedimentation dosing devices of the sedimentation tank comprise alkali adjusting dosing devices, polyaluminum chloride dosing devices and polyacrylamide dosing devices, the sedimentation dosing devices all comprise sedimentation dosing boxes and sedimentation dosing pumps, and the sedimentation online control device comprises a sedimentation pH online detection instrument.

4. A chromium-containing wastewater treatment device according to claim 1, characterized in that: The rotating ceramic membrane assembly comprises a rotating ceramic membrane, a hollow shaft and a pressure container.

5. A chromium-containing wastewater treatment device according to claim 1, characterized in that: Water inlets and water outlets are arranged on the raw water tank, the reaction tank, the sedimentation tank, the rotating ceramic membrane device, the clean water tank and the concentrated water tank.

6. A chromium-containing wastewater treatment device according to claim 1, characterized in that: A booster pump is arranged on the connecting pipeline between the sedimentation tank and the rotating ceramic membrane device.

7. A chromium-containing wastewater treatment device according to claim 1, characterized in that: The device body further comprises a liquid crystal panel, a microcontroller is arranged in the liquid crystal panel, an input end of the liquid crystal panel is connected with an input end of the microcontroller, and output ends of the microcontroller are electrically connected with the reaction dosing devices, the reaction stirring device, the reaction online control device, the reaction circulating pump, the sedimentation dosing devices, the sedimentation stirring device, the sedimentation online control device, the sedimentation circulating pump and the booster pump.

8. A chromium-containing wastewater treatment device according to claim 1, characterized in that: A power line connected with an external power source is arranged on the device body, and the power line is electrically connected with the liquid crystal panel.

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