CN213388094U - Chromium-containing wastewater treatment system - Google Patents
Chromium-containing wastewater treatment system Download PDFInfo
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- CN213388094U CN213388094U CN202021578125.XU CN202021578125U CN213388094U CN 213388094 U CN213388094 U CN 213388094U CN 202021578125 U CN202021578125 U CN 202021578125U CN 213388094 U CN213388094 U CN 213388094U
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Abstract
The utility model discloses a chromium-containing wastewater treatment system relates to the waste water treatment field, include the chromium-containing wastewater equalizing basin who connects in order through the pipeline, first pH adjusting tank, the reduction reaction pond, second pH adjusting tank, the pond that thoughtlessly congeals, the flocculation basin, the sedimentation tank, first intermediate reservoir, third pH adjusting tank, reserve the reduction pond, fourth pH adjusting tank, mix the pond soon, reserve the reaction tank, the buffering sedimentation tank, pond in the middle of the second, MCR membrane pond and chromium-containing control pond, set up first pump on the connecting tube in chromium-containing wastewater equalizing basin and first pH adjusting tank, set up the second pump on the connecting tube in MCR membrane pond and chromium-containing control pond, the flowing back end in chromium-containing control pond passes through the entry end that third pump connects the three-way valve. The utility model discloses can solve the problem that the chromium-containing wastewater treatment system of current waste water treatment enterprise still exceeds standard the unable former water use of as the retrieval and utilization of total chromium content in the play water to chromium-containing wastewater treatment back.
Description
Technical Field
The utility model relates to a waste water treatment field especially relates to a chromium-containing wastewater treatment system.
Background
Electroplating is a surface treatment method commonly used in the manufacturing industry, and for the faucet industry, most products need to be plated with chrome for appearance treatment, and the chrome is heavy metal while being used as a product beauty maker, so that the environment and even the health of people can be greatly damaged due to careless treatment. Therefore, in the electroplating industry, the treatment of electroplating wastewater is of great importance. For the treatment of waste water containing heavy metal chromium, there are reduction precipitation method, electrolytic precipitation method, etc. at present, waste water containing chromium is generally collected in a waste water pool, mixed with chemicals to cause chemical reaction, and then the precipitated chromium is changed into solid to be buried underground. The method has the advantages of high cost and poor treatment effect, and the treated chromium and water can not be recycled, thereby causing great waste and being not beneficial to the strategy of sustainable development.
When the chromium-containing wastewater is treated by the conventional wastewater treatment enterprises through a reduction precipitation method, only one-time reduction precipitation is generally carried out, and the total chromium of the 2 standard in the discharge standard of electroplating pollutants (GB 21900-2008) of heavy metals is required to be treated independently to be below 0.5 mg/L.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a chromium-containing wastewater treatment system is provided, the problem that the total chromium content still exceeds standard and can't be used as the retrieval and utilization raw water in the effluent after the chromium-containing wastewater treatment of current wastewater treatment enterprise is solved to chromium-containing wastewater treatment system.
The utility model provides a technical scheme that its technical problem adopted is: a chromium-containing wastewater treatment system comprises a chromium-containing wastewater adjusting tank, a first pH adjusting tank, a reduction reaction tank, a second pH adjusting tank, a coagulation tank, a flocculation tank, a sedimentation tank, a first middle tank, a third pH adjusting tank, a reserved reduction tank, a fourth pH adjusting tank, a quick mixing tank, a reserved reaction tank, a buffer sedimentation tank, a second middle tank, an MCR membrane tank and a chromium-containing monitoring tank which are sequentially connected through pipelines, wherein a first pump is arranged on a connecting pipeline of the chromium-containing wastewater adjusting tank and the first pH adjusting tank, a second pump is arranged on a connecting pipeline of the MCR membrane tank and the chromium-containing monitoring tank, a liquid discharge end of the chromium-containing monitoring tank is connected with an inlet end of a three-way valve through a third pump, two outlet ends of the three-way valve are respectively connected with a reuse raw water tank and a chromium-containing wastewater emergency tank, a liquid discharge end of the chromium-containing wastewater emergency tank is communicated with a liquid inlet end of the chromium-containing wastewater adjusting tank, a sludge discharge end of the sedimentation tank and the buffer sedimentation tank are communicated with, the mud discharging end of the chromium-containing sludge pool is communicated with the mud inlet end of the chromium-containing mud press, the liquid discharging end of the chromium-containing mud press is communicated with the liquid inlet end of the chromium-containing wastewater adjusting tank, and a monitoring device for monitoring the chromium ion content is arranged in the chromium-containing monitoring tank.
Further, the monitoring device comprises a hexavalent chromium ion content monitoring device and a trivalent chromium ion monitoring device.
Further, chromium-containing wastewater treatment system still includes the PLC controller, monitoring devices and PLC controller electric connection, the PLC controller passes through relay and three-way valve electric connection.
Further, the chromium-containing wastewater regulating tank is communicated with an external chromium-containing wastewater collecting pipe network.
Further, the first pump is a lift pump.
Further, the second pump is a suction pump.
Further, the third pump is an emergency return pump.
The utility model discloses following beneficial effect has:
the utility model discloses a chromium-containing wastewater treatment system through to chromium-containing waste water through twice reduction precipitation and a filtration of Membrane Chemical Reactor (MCR), can reduce the total chromium content in chromium-containing waste water to below 0.5mg/L, and play water quality of water is up to standard, and it can regard as the retrieval and utilization raw water to use completely to go out water.
Wherein, the Membrane Chemical Reactor (MCR) is formed by gathering a plurality of ultrafiltration membrane capillaries, the aperture range of the membrane is between 0.1 and 0.001 mu m, and the filtration membranes with different apertures can be selected for wastewater with different properties. When in use, the membrane module is immersed in the raw water pool; water molecules penetrate through the capillary membrane from outside to inside under the pumping condition of the water producing pump, and purified water in the capillary membrane is gathered into purified water flow through the purified water collecting pipe; contaminants are trapped in the raw water pool outside the capillary membrane. The outer wall of the capillary membrane can be cleaned through procedures such as aeration in the tank, water flow backwashing or chemical cleaning, and the like, so that the capillary membrane has strong anti-pollution capacity.
Drawings
FIG. 1 is a schematic view showing the connection of the structural components of the chromium-containing wastewater treatment system of the present invention.
Detailed Description
As shown in figure 1, the chromium-containing wastewater treatment system comprises a chromium-containing wastewater adjusting tank 1, a first pH adjusting tank 4, a reduction reaction tank 5, a second pH adjusting tank 6, a coagulation tank 7, a flocculation tank 8, a sedimentation tank 9, a first intermediate tank 10, a third pH adjusting tank 11, a reserved reduction tank 12, a fourth pH adjusting tank 13, a rapid mixing tank 14, a reserved reaction tank 15, a buffering sedimentation tank 16, a second intermediate tank 17, an MCR membrane tank 18 and a chromium-containing monitoring tank 20 which are connected in sequence through pipelines, wherein a first pump 3 is arranged on a connecting pipeline of the chromium-containing wastewater adjusting tank 1 and the first pH adjusting tank 4, a second pump 19 is arranged on a connecting pipeline of the MCR membrane tank 18 and the chromium-containing monitoring tank 20, a liquid discharge end of the chromium-containing monitoring tank 20 is connected with an inlet end of a three-way valve 22 through the third pump 21, two outlet ends of the three-way valve 22 are respectively connected with a reuse raw water tank 23 and a chromium-containing wastewater emergency tank 2, the liquid discharge end of the chromium-containing wastewater emergency pool 2 is communicated with the liquid inlet end of the chromium-containing wastewater adjusting pool 1, the sludge discharge end of the sedimentation pool 9 and the buffering sedimentation pool 16 is communicated with the sludge inlet end of the chromium-containing sludge pool 24, the sludge discharge end of the chromium-containing sludge pool 24 is communicated with the sludge inlet end of the chromium-containing mud press 25, the liquid discharge end of the chromium-containing mud press 25 is communicated with the liquid inlet end of the chromium-containing wastewater adjusting pool 1, and a monitoring device for monitoring the chromium ion content is arranged in the chromium-containing monitoring pool 20.
The utility model discloses a chromium-containing wastewater treatment system through to chromium-containing waste water through twice reduction precipitation and a filtration of Membrane Chemical Reactor (MCR), can reduce the total chromium content in chromium-containing waste water to below 0.5mg/L, and play water quality of water is up to standard, and it can regard as the retrieval and utilization raw water to use completely to go out water.
Wherein, the Membrane Chemical Reactor (MCR) is formed by gathering a plurality of ultrafiltration membrane capillaries, the aperture range of the membrane is between 0.1 and 0.001 mu m, and the filtration membranes with different apertures can be selected for wastewater with different properties. When in use, the membrane module is immersed in the raw water pool; water molecules penetrate through the capillary membrane from outside to inside under the pumping condition of the water producing pump, and purified water in the capillary membrane is gathered into purified water flow through the purified water collecting pipe; contaminants are trapped in the raw water pool outside the capillary membrane. The outer wall of the capillary membrane can be cleaned through procedures such as aeration in the tank, water flow backwashing or chemical cleaning, and the like, so that the capillary membrane has strong anti-pollution capacity.
The monitoring device comprises a hexavalent chromium ion content monitoring device and a trivalent chromium ion monitoring device.
The chromium-containing wastewater treatment system further comprises a PLC (programmable logic controller), the monitoring device is electrically connected with the PLC, and the PLC is electrically connected with the three-way valve 22 through a relay.
The chromium-containing wastewater adjusting tank 1 is communicated with an external chromium-containing wastewater collecting pipe network.
The first pump 3 is a lift pump.
The second pump 19 is a suction pump.
The third pump 21 is an emergency return pump.
Use the utility model discloses a when chromium-containing wastewater processing system handles chromium-containing wastewater, go on according to following step: chromium-containing wastewater from each workshop of the park is collected to a chromium-containing wastewater adjusting tank 1 through a pipe network, is lifted to a first pH adjusting tank 4 through a first pump 3 after being stopped and tempered uniformly, is added with acid, enters a reduction reaction tank 5 after the pH =3.5 is adjusted, and is added with SO2、FeSO4、Na2SO3、NaHSO3Reducing hexavalent chromium into trivalent chromium by using a reducing agent, then adding alkali into a second pH adjusting tank 6, adjusting the pH to be alkaline, then adding the alkaline into a coagulation tank 7, adding a small amount of coagulant PAC into the coagulation tank 8, adding a small amount of flocculant PAM into the sedimentation tank 9, enabling effluent to pass through a first intermediate tank 10 and then enter a third pH adjusting tank 11, adjusting the pH =3.5, then entering a reserved reduction tank 12, adding SO, and finally adding2、FeSO4、Na2SO3、NaHSO3Reducing agents are added, then the mixture enters a fourth pH adjusting tank 13, alkali is added, the pH is adjusted to be alkaline, a small amount of inflow coagulant PAC is added, the mixture enters a fast mixing tank 14, a small amount of flocculant PAM is added, the mixture enters a reserved reaction tank 15, secondary sedimentation is carried out in a buffering sedimentation tank 16, primary mud-water separation is carried out, and the mixture passes through a second intermediate tank17 into an MCR membrane pool 18, under the action of a second pump 19, the wastewater passes through the MCR membrane pool 18, mud and water are thoroughly separated by the second pump by utilizing a membrane filtration technology, the effluent passes through a chromium-containing monitoring pool 20 to monitor whether the chromium ion content of the effluent reaches the standard, if the chromium ion content of the effluent does not reach the standard, an operator controls a three-way valve 22 to communicate the chromium-containing monitoring pool 20 with the chromium-containing wastewater emergency pool 2, and the effluent is forced to flow back to the chromium-containing wastewater emergency pool 2. If the chromium ion content of the effluent reaches the standard, an operator controls the three-way valve 22 to communicate the chromium-containing monitoring pool 20 with the recycling raw water pool 23, and the effluent is forced to enter the recycling raw water pool 23 for further recycling water treatment. The chromium-containing sludge generated by the sedimentation tank 9 and the buffering sedimentation tank 16 enters the chromium-containing sludge tank 24 through pipelines, the chromium-containing sludge in the chromium-containing sludge tank 24 is compressed by a chromium-containing mud press, and the generated effluent enters the chromium-containing wastewater regulating tank 1 through a pipeline to be circularly treated again.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any person skilled in the art can make some changes or modifications to equivalent embodiments with equivalent changes without departing from the technical scope of the present invention, but all those persons do not depart from the technical spirit of the present invention, and any simple modifications, equivalent replacements, and improvements made to the above embodiments are within the spirit and principle of the present invention, and still belong to the protection scope of the technical solution of the present invention.
Claims (7)
1. A chromium-containing wastewater treatment system is characterized by comprising a chromium-containing wastewater adjusting tank (1), a first pH adjusting tank (4), a reduction reaction tank (5), a second pH adjusting tank (6), a coagulation tank (7), a flocculation tank (8), a sedimentation tank (9), a first intermediate tank (10), a third pH adjusting tank (11), a reserved reduction tank (12), a fourth pH adjusting tank (13), a quick mixing tank (14), a reserved reaction tank (15), a buffering sedimentation tank (16), a second intermediate tank (17), an MCR membrane tank (18) and a chromium-containing monitoring tank (20) which are sequentially connected through pipelines, wherein a first pump (3) is arranged on a connecting pipeline of the chromium-containing wastewater adjusting tank (1) and the first pH adjusting tank (4), a second pump (19) is arranged on a connecting pipeline of the MCR membrane tank (18) and the chromium-containing monitoring tank (20), and the liquid discharge end of the chromium-containing monitoring tank (20) is connected with the inlet end of a three-way valve (22) through the third pump (21), two exit ends of three-way valve (22) are connected retrieval and utilization former pond (23) and the emergent pond (2) of chromium-containing waste water respectively, the flowing back end of the emergent pond (2) of chromium-containing waste water and the feed liquor end intercommunication of chromium-containing waste water equalizing basin (1), the mud end of row of sedimentation tank (9) and buffer sedimentation tank (16) and the mud end intercommunication of advancing of chromium-containing sludge impoundment (24), the mud end of row of chromium-containing sludge impoundment (24) and the mud end intercommunication of advancing of chromium-containing mud press (25), the flowing back end of chromium-containing mud press (25) and the feed liquor end intercommunication of chromium-containing waste water equalizing basin (1), set up the monitoring devices who is used for monitoring chromium ion content in chromium-containing monitoring pond (20).
2. The chromium-containing wastewater treatment system according to claim 1, wherein said monitoring means comprises a hexavalent chromium ion content monitoring means and a trivalent chromium ion monitoring means.
3. The chromium-containing wastewater treatment system of claim 1, further comprising a PLC controller, wherein the monitoring device is electrically connected with the PLC controller, and the PLC controller is electrically connected with the three-way valve (22) through a relay.
4. The chromium-containing wastewater treatment system as claimed in claim 1, wherein the chromium-containing wastewater regulating tank (1) is communicated with an external chromium-containing wastewater collecting pipe network.
5. The chromium-containing wastewater treatment system according to claim 1, wherein said first pump (3) is a lift pump.
6. The chromium-containing wastewater treatment system according to claim 1, wherein said second pump (19) is a suction pump.
7. The chromium-containing wastewater treatment system according to claim 1, wherein said third pump (21) is an emergency return pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021578125.XU CN213388094U (en) | 2020-08-03 | 2020-08-03 | Chromium-containing wastewater treatment system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021578125.XU CN213388094U (en) | 2020-08-03 | 2020-08-03 | Chromium-containing wastewater treatment system |
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| Publication Number | Publication Date |
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| CN213388094U true CN213388094U (en) | 2021-06-08 |
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| CN202021578125.XU Active CN213388094U (en) | 2020-08-03 | 2020-08-03 | Chromium-containing wastewater treatment system |
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| CN (1) | CN213388094U (en) |
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- 2020-08-03 CN CN202021578125.XU patent/CN213388094U/en active Active
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