CN108726805B - Full-automatic treatment equipment and process for chromium-containing wastewater - Google Patents
Full-automatic treatment equipment and process for chromium-containing wastewater Download PDFInfo
- Publication number
- CN108726805B CN108726805B CN201810628643.9A CN201810628643A CN108726805B CN 108726805 B CN108726805 B CN 108726805B CN 201810628643 A CN201810628643 A CN 201810628643A CN 108726805 B CN108726805 B CN 108726805B
- Authority
- CN
- China
- Prior art keywords
- tank
- water
- pump
- mud
- reduction
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000002351 wastewater Substances 0.000 title claims abstract description 55
- 239000011651 chromium Substances 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 32
- 230000008569 process Effects 0.000 title claims abstract description 25
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 title claims abstract description 24
- 229910052804 chromium Inorganic materials 0.000 title claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 139
- 239000012528 membrane Substances 0.000 claims abstract description 64
- 230000009467 reduction Effects 0.000 claims abstract description 60
- 238000000926 separation method Methods 0.000 claims abstract description 49
- 239000002253 acid Substances 0.000 claims abstract description 46
- 238000005273 aeration Methods 0.000 claims abstract description 45
- 239000003513 alkali Substances 0.000 claims abstract description 35
- 239000007788 liquid Substances 0.000 claims abstract description 34
- 239000010802 sludge Substances 0.000 claims abstract description 32
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 28
- 230000007246 mechanism Effects 0.000 claims abstract description 19
- 238000003756 stirring Methods 0.000 claims abstract description 15
- 239000000945 filler Substances 0.000 claims abstract description 8
- 238000006722 reduction reaction Methods 0.000 claims description 64
- 230000001105 regulatory effect Effects 0.000 claims description 25
- 238000006243 chemical reaction Methods 0.000 claims description 18
- 238000011010 flushing procedure Methods 0.000 claims description 16
- 230000033228 biological regulation Effects 0.000 claims description 8
- 239000003795 chemical substances by application Substances 0.000 claims description 7
- 230000007363 regulatory process Effects 0.000 claims description 5
- 230000000903 blocking effect Effects 0.000 claims description 3
- 230000035484 reaction time Effects 0.000 claims description 2
- 238000007599 discharging Methods 0.000 claims 1
- 238000004065 wastewater treatment Methods 0.000 abstract description 4
- 238000011001 backwashing Methods 0.000 abstract description 2
- 239000010842 industrial wastewater Substances 0.000 abstract description 2
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 238000004062 sedimentation Methods 0.000 description 6
- 238000001556 precipitation Methods 0.000 description 4
- 238000001471 micro-filtration Methods 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000009713 electroplating Methods 0.000 description 2
- 238000005189 flocculation Methods 0.000 description 2
- 230000016615 flocculation Effects 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000002161 passivation Methods 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 239000005028 tinplate Substances 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- JHWIEAWILPSRMU-UHFFFAOYSA-N 2-methyl-3-pyrimidin-4-ylpropanoic acid Chemical compound OC(=O)C(C)CC1=CC=NC=N1 JHWIEAWILPSRMU-UHFFFAOYSA-N 0.000 description 1
- FGUUSXIOTUKUDN-IBGZPJMESA-N C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 Chemical compound C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 FGUUSXIOTUKUDN-IBGZPJMESA-N 0.000 description 1
- 241000565357 Fraxinus nigra Species 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 238000005276 aerator Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 235000011116 calcium hydroxide Nutrition 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000000701 coagulant Substances 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 231100000086 high toxicity Toxicity 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- HRZFUMHJMZEROT-UHFFFAOYSA-L sodium disulfite Chemical compound [Na+].[Na+].[O-]S(=O)S([O-])(=O)=O HRZFUMHJMZEROT-UHFFFAOYSA-L 0.000 description 1
- 229940001584 sodium metabisulfite Drugs 0.000 description 1
- 235000010262 sodium metabisulphite Nutrition 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
- C02F2101/22—Chromium or chromium compounds, e.g. chromates
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/04—Oxidation reduction potential [ORP]
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
Abstract
A full-automatic treatment device and a full-automatic treatment process for chromium-containing wastewater belong to the technical field of industrial wastewater treatment devices and processes and are used for treating Cr (VI) -containing wastewater. The technical proposal is as follows: the water quantity adjusting tank is sequentially connected with the reduction tank and the mud-water separation tank through pipelines, a reduction tank water inlet pump and a mud-water separation tank water inlet pump are respectively installed in the pipelines, a stirring device, a first liquid level sensor, a pH sensor and an ORP sensor are arranged in the reduction tank, a second liquid level sensor, a membrane component, an aeration mechanism, an inclined tube filler and a sludge bucket are arranged in the mud-water separation tank, the membrane component is respectively connected with the water outlet temporary storage tank through a membrane component drainage pump and a backwashing pump, and an acid storage tank, a reducing agent storage tank and an alkali storage tank are respectively connected with the reduction tank through pipelines, and an acid adding pump, a reducing agent pump and an alkali adding pump are respectively installed in the pipelines. The invention can effectively reduce the occupied area of the wastewater treatment equipment, improve the automatic operation degree and reduce the cost of people and force.
Description
Technical Field
The invention relates to equipment and a treatment process for treating Cr (VI) containing wastewater, and belongs to the technical field of industrial wastewater treatment equipment and process.
Background
In the electroplating passivation process, a sodium dichromate solution is needed, and in order to reduce black ash defects of the tin plate and the content of residual Cr (VI) on the tin plate, a large amount of clean water is needed for washing after passivation, so that the washing water contains a large amount of Cr (VI), wherein the Cr (VI) is a high-toxicity substance, the toxicity of which is 100 times of that of Cr (III), and is one of main pollutants in the electroplating industry.
The method for treating chromium-containing wastewater by the reduction precipitation method is a process for reducing Cr (VI) into Cr (III) by using a proper reducing agent and then precipitating and removing Cr (III) under alkaline conditions, and more than 80 percent of chromium-containing wastewater is treated by adopting the method, but the method generally needs a plurality of unit procedures of acid regulation, reduction, alkali regulation, flocculation coagulation, precipitation and the like, and has the problems of long flow, multiple structures, large occupied area, inaccurate manual administration control, large medicament consumption and the like.
Disclosure of Invention
The invention aims to solve the technical problem of providing full-automatic treatment equipment and process for chromium-containing wastewater, which can effectively reduce the occupied area of the wastewater treatment equipment, improve the automatic operation degree and reduce the cost of people and force.
The technical scheme for solving the technical problems is as follows:
the utility model provides a full-automatic treatment facility of chromium-containing waste water, it includes the water yield adjustment jar, the reducing tank, the mud-water separation jar, go out the water temporary storage jar, the acid storage jar, the reductant storage tank, the alkali storage jar, the water yield adjustment jar is connected through the pipeline in proper order with reducing tank, mud-water separation jar intake pump is installed respectively in the pipeline, set up agitating unit in the reducing tank and first level sensor, pH sensor, ORP sensor, set up second level sensor in the mud-water separation jar, the membrane module, aeration mechanism, the pipe packing, the sludge hopper, aeration mechanism is located the below of membrane module, the sludge hopper is located the bottom of mud-water separation jar, the membrane module is connected with play water temporary storage jar through play water pipeline and membrane module drain pump, go out the water temporary storage jar and still be connected with the membrane module through backwash pipeline and backwash pump, the acid storage jar, the reductant storage jar, the alkali storage jar is connected with the reducing tank through the pipeline respectively, install acid pump in the pipeline respectively, the reductant pump, alkali pump.
The full-automatic treatment equipment for the chromium-containing wastewater is characterized in that the upper parts of the reduction tank and the mud-water separation tank are respectively provided with a high overflow hole, and the high overflow holes are connected with the water quantity regulating tank through pipelines.
Above-mentioned full-automatic treatment facility of chromium-containing waste water, mud-water separation tank's aeration mechanism includes aeration pipeline, aeration head, and the aeration pipeline is located the below of membrane module, and the aeration head is installed on the aeration pipeline, and the aeration head is relative with the lower part of membrane module, and the aeration pipeline is connected with compressed air pipeline.
A full-automatic treatment process of chromium-containing wastewater by using the equipment comprises the following steps:
a. and (3) water quantity adjustment: the chromium-containing wastewater generated continuously or intermittently firstly enters a water quantity adjusting tank for water quantity adjustment so as to ensure the continuity and stability of subsequent reactions;
b. a water inlet stage of the reduction tank: enabling the wastewater to enter a reduction tank from a water quantity adjusting tank, and continuously stirring by a stirring device arranged in the reduction tank;
c. acid regulating stage of the reduction pot: adding an acid regulator into the reduction tank to stabilize the pH value of the wastewater;
d. reduction stage: after the acid regulating stage is finished, adding a reducing agent into the reduction tank, and controlling the reaction ORP value;
e. and (3) alkali adjustment: after the reduction stage is completed, adding an alkali regulating agent into the reduction tank to stabilize the pH value of the wastewater;
f. and (3) mud-water separation: after alkali adjustment is completed, the wastewater enters a mud-water separation tank, clear water filtered and separated by a membrane component is discharged outside through a water outlet temporary storage tank, and sludge is trapped in the mud-water separation tank;
g. standing and settling: after the mud-water separation is finished, standing in the mud-water separation tank to naturally settle the sludge into a sludge bucket, wherein the settling time is the interval time from the end of water drainage to the beginning of water drainage in the next period;
h. the reaction period is ended, and the next period of reaction is started;
j. sludge discharge: the sludge collected in the sludge hopper is discharged periodically;
k. back flushing the membrane component: and back flushing the membrane module by utilizing the water temporarily stored in the water outlet temporary storage tank.
In the above-mentioned full-automatic treatment process of chromium-containing waste water, in the step b, the water inlet of the reduction tank is started and stopped by controlling the water inlet pump through the first liquid level sensor in the reduction tank, so that the waste water is pumped into the reduction tank by the water quantity regulating tank, and the liquid level reaches the set high position.
In the step c, the pH value of the wastewater in the acid regulating stage of the reduction tank is set to be 2.0, the upper limit value is set to be 2.5, the adding amount of the acid regulator is fed back and regulated through a pH sensor in the reduction tank, when the pH value of the wastewater is reduced to the lower limit value, the acid adding pump is stopped, stable stirring is carried out for 1-2min, if the pH value is not increased beyond the upper limit value, the adding of the acid regulator is stopped, and if the pH value exceeds the upper limit value, the regulating process is repeated.
In the above-mentioned full-automatic treatment process of chromium-containing waste water, in the step d, the set value upper limit of ORP in the reduction stage is 228mv, the lower limit is 220mv, the reduction reaction time is 25-35min, when the waste water ORP reaches the set value upper limit, the reducing agent pump is started, the ORP value reaches the set lower limit, the acid adding pump is stopped, and the reduction reaction is started, after the reducing agent pump is started, the starting control of the acid adding pump is shielded, so as to prevent the subsequent alkali regulating process from being disordered.
In the above-mentioned full-automatic treatment process of chromium-containing waste water, in the step e, after the completion of reduction reaction, its addition quantity is regulated by pH value feedback, the pH value of waste water in the reduction tank in the alkali-regulating stage is set to be 8.0, and its upper limit value is set to be 8.5, when the pH value of waste water is raised to the upper limit of set value, alkali-adding pump is stopped, stable stirring is implemented for 1-2min, if the pH value is not lowered beyond the lower limit value, alkali-regulating agent addition is stopped, if the pH value is beyond the lower limit value, the regulation process is repeated.
In the step f, the membrane module drainage pump for mud-water separation is controlled by the second liquid level sensor in the mud-water separation tank, when the liquid level detected by the second liquid level sensor is in a high position, the membrane module drainage pump is controlled to be started, and the aeration mechanism is started at the same time, so that flushing is formed on the surface of the membrane module, the occurrence of surface blocking is reduced, and when the liquid level detected by the second liquid level sensor is in a low position, the membrane module drainage pump is stopped, and the aeration mechanism is stopped at the same time.
In the step k, the membrane assembly back flushing is performed once after every 2-4 drainage cycles.
The beneficial effects of the invention are as follows:
1. the invention sets the acid regulation, reduction and alkali regulation processes in the chromium-containing wastewater reduction precipitation treatment process in the same reactor, and enables each reaction to be sequentially carried out through automatic control without mutual influence, thereby effectively improving the treatment efficiency and reducing the number of reaction structures and the occupied area.
2. The invention utilizes the microfiltration membrane component to realize mud-water separation, has high separation efficiency, and can effectively reduce the problem of surface blockage of the membrane component by adopting an aeration scouring method and regular back flushing in the drainage process.
3. According to the invention, the sludge-water separation and sludge sedimentation collection of the microfiltration membrane component are organically combined, so that the sedimentation of the sludge is not influenced by the size of a structure (namely hydraulic retention time), the occupied area can be greatly reduced, meanwhile, the sludge is continuously trapped in the sludge-water separation tank through the microfiltration membrane component, the sludge concentration is increased, the probability of collision and combination among sludge particles is improved, larger particle aggregates are formed, sedimentation is easier, and flocculation and coagulant are not needed.
4. And the inclined tube filler is arranged between the aeration head and the sludge hopper, so that the sludge sedimentation efficiency is effectively improved, and meanwhile, the influence of the inclined tube filler on the sludge sedimentation at the lower part in the process of membrane assembly drainage and aeration can be effectively reduced, and the secondary suspension of part of sludge is prevented.
5. After the membrane assembly is drained, a water outlet temporary storage tank is arranged, and part of water is intercepted for backwashing of the membrane assembly, so that additional new water consumption is not needed.
6. The process and the equipment run automatically by means of automatic equipment in the whole course, and have high precision and low labor cost.
Drawings
FIG. 1 is a schematic structural view of the chromium-containing wastewater fully-automatic treatment device of the invention.
The figures are labeled as follows: the device comprises a water quantity adjusting tank 1, an acid storage tank 2, a reducing agent storage tank 3, an alkali storage tank 4, a reducing tank 5, a mud-water separation tank 6, an effluent temporary storage tank 7, a reducing tank water inlet pump 8, an acid adding pump 9, a reducing agent pump 10, an alkali adding pump 11, a mud-water separation tank water inlet pump 12, a sludge pump 13, a membrane assembly drainage pump 14, a back flushing pump 15, a first liquid level sensor 16, a pH sensor 17, an ORP sensor 18, a second liquid level sensor 19, a membrane assembly 20, an aeration mechanism 21, a pipe chute filler 22 and a sludge bucket 23.
Detailed Description
The full-automatic treatment equipment for the chromium-containing wastewater consists of a water quantity adjusting tank 1, a reduction tank 5, a mud-water separation tank 6, a water outlet temporary storage tank 7, an acid storage tank 2, a reducing agent storage tank 3 and an alkali storage tank 4, wherein the tank bodies are connected through pipelines and pumps.
The water quantity regulating tank 1 is shown as a reaction vessel for regulating intermittent incoming water to ensure the continuity of the subsequent flow path; the reduction tank 5 is a reaction vessel for Cr 6+ Sequentially carrying out acid regulation, reduction and alkali regulation reactions; the mud-water separation tank 6 is a reaction vessel for separating the generated precipitate from the clean water and completing the collection and discharge of the precipitate. The water quantity adjusting tank 1 is sequentially connected with the reduction tank 5 and the mud-water separation tank 6 through pipelines, a reduction tank water inlet pump 8 and a mud-water separation tank water inlet pump 12 are respectively arranged in the pipelines, and high overflow holes are respectively arranged on the upper parts of the reduction tank 5 and the mud-water separation tank 6 and are connected with the water quantity adjusting tank through the pipelines.
In the figure, a stirring device, a first liquid level sensor 16, a pH sensor 17, and an ORP sensor 18 are provided in the reduction tank 5. The mud-water separation tank 6 is internally provided with a second liquid level sensor 19, a membrane assembly 20, an aeration mechanism 21, an inclined pipe filler 22 and a sludge bucket 23, wherein the aeration mechanism 21 is positioned below the membrane assembly 20, and the sludge bucket 23 is positioned at the bottom of the mud-water separation tank 6.
The aeration mechanism 21 of the mud-water separation tank 6 is shown to comprise an aeration pipe and an aeration head, wherein the aeration pipe is positioned below the membrane assembly 20, the aeration head is arranged on the aeration pipe, the aeration head is opposite to the lower part of the membrane assembly 20, and the aeration pipe is connected with a compressed air pipe. The aeration mechanism 21 is used for flushing the surface of the membrane assembly 20, so that the blocking of the surface of the membrane assembly 20 is reduced. The membrane module 20 is located above the aerator, which is located above the chute packing 22, and the vertical position interval of the three components is not less than 0.3m.
The membrane assembly 20 of the mud-water separation tank 6 is shown connected with the water outlet temporary storage tank 7 through a water outlet pipeline and a membrane assembly drainage pump 14, and the water outlet temporary storage tank 7 is also connected with the membrane assembly 20 through a back flushing pipeline and a back flushing pump 15. After the membrane module 20 is drained, a water outlet temporary storage tank 7 is arranged, the water outlet temporary storage tank 7 adopts natural overflow water, and part of the water discharged by temporary storage can be used for back flushing and water outlet detection of the membrane module 20, so that additional new water consumption is not needed.
The acid storage tank 2, the reducing agent storage tank 3 and the alkali storage tank 4 are respectively connected with the reducing tank 5 through pipelines, and an acid adding pump 9, a reducing agent pump 10 and an alkali adding pump 11 are respectively arranged in the pipelines and are used for respectively adding an acid regulator, a reducing agent and an alkali regulator into the reducing tank 5.
The full-automatic treatment process of the chromium-containing wastewater comprises the following steps:
intermittently or continuously generated chromium-containing wastewater is injected into the water quantity adjusting tank 1 to adjust the water quantity, so that the continuity and stability of the subsequent reaction are ensured;
the first liquid level sensor 16 of the reduction tank 5 detects that the liquid level of the reduction tank is below a low level (L), the water inlet pump 8 of the reduction tank is started to start water inlet until the first liquid level sensor 16 reaches a high level (H), and water inlet is completed;
after the water inflow is completed, an acid regulating stage is carried out, a pH sensor 17 detects that the pH value of the wastewater is higher than a set upper limit value, an acid adding pump 9 is started, an acid regulator HCl is pumped into a reduction tank 5 from an acid storage tank 2, stirring and mixing are carried out until the pH value of the wastewater reaches a set lower limit value of 2.0, the acid adding pump 9 is stopped, stirring is continued for 1-2min, the pH value detected by the pH sensor 17 rises to exceed the set upper limit value of 2.5, and then the acid regulating process is continued until the pH value is stabilized between the set upper limit value and the set lower limit value within 1-2min so as to ensure the mixing uniformity;
after the pH is stable, the acid adding stage is finished, the reduction stage is started, the ORP sensor 18 detects that the ORP value of the wastewater is higher than the set upper limit value, the reducing agent pump 10 is started, and the reducing agent NaHSO is regulated 3 Pumping the solution into a reduction tank 5 from a reducing agent storage tank 3, stirring and mixing until the ORP value of the wastewater reaches a set valueThe lower limit, the reductant pump 10 is stopped, the controller starts timing, and the system enters a reduction reaction stage during which the reductant pump 10 is started to control the reaction ORP between the set upper and lower limits when the detected ORP value is above the set upper limit. The reducing agent pump 10 feeds back a first starting signal to the controller, and then the controller temporarily shields a starting and stopping signal of the acid adding pump 9 to prevent confusion in the subsequent alkali adjustment process;
after the reduction reaction is timed, the alkaline adjustment stage is started, the pH sensor 17 detects that the pH value is lower than the set lower limit value 8.0 in the alkaline adjustment stage, the alkaline adding pump 11 is started, the alkaline adjusting agent NaOH solution is pumped into the reduction tank 5 from the alkaline storage tank 4, the reduction tank is stirred and mixed, and when the pH value of the wastewater rises to the set upper limit value 8.5, the alkaline adding pump 11 is stopped. Stably stirring for 1-2min, and stopping adding the alkali regulating agent if the pH value is reduced and does not exceed the set lower limit value; if the pH value exceeds the set lower limit value, repeating the adjusting process to ensure that the pH value of the final wastewater is stabilized between the set upper limit value and the set lower limit value, and ending the alkali adjusting stage;
after the alkali adjustment stage is finished, a water inlet pump 12 of the mud-water separation tank is started, and wastewater is pumped into a mud-water separation tank 6 from a reduction tank 5;
when the second liquid level sensor 19 in the mud-water separation tank 6 detects that the liquid level of the mud-water separation tank reaches the high level (H), the membrane assembly drainage pump 14 and the aeration mechanism 21 are simultaneously started, the discharged water overflows from the high level of the temporary water outlet storage tank 7, and the water outlet flow of the membrane assembly drainage pump 14 is higher than that of the mud-water separation tank water inlet pump 12. During this time, the second liquid level sensor 19 in the mud-water separation tank 6 detects that the liquid level reaches the low level (L), and the membrane module drain pump 14 is suspended until the liquid level reaches the high level (H), and the drain is restored.
When the liquid level in the reduction tank 5 reaches the low level (L) through the detection of the first liquid level sensor 16, the water inlet pump 12 of the mud-water separation tank, the drainage pump 14 of the membrane component and the aeration mechanism 21 are synchronously stopped, the mud enters the standing sedimentation stage of the mud-water separation tank 6, and the mud is deposited into the bottom mud hopper 23 through the inclined pipe filler 22;
the duration of the stationary precipitation stage is the time interval from the end of the membrane module 20 drainage to the next cycle of membrane module 20 drainage;
after the reaction period is finished, the water starts to be re-fed into the reduction tank 5, the shielding started by the acid adding pump 9 is released, and the operation of the next period is started;
according to actual conditions, the sludge pump 13 is periodically opened to perform sludge discharge operation;
the back flushing of the membrane assembly 20 is performed once every 2-4 cycles according to the specific conditions, and the back flushing pump 15 and the aeration mechanism 21 are simultaneously started during back flushing, so that the cleaning effect is enhanced.
The membrane component 20 adopts a micro-filter plate type membrane component, and the membrane flux is 20-40L/(m) 2 H) the filtration accuracy is 0.1-5 μm.
If the liquid level of the reduction tank 5 or the mud-water separation tank 6 is too high due to the fault of the liquid level sensor or other reasons, the wastewater can overflow back to the water quantity regulating tank 1 through an overflow port arranged at the upper part of the tank body, so that the wastewater is prevented from overflowing and polluting the environment.
The acid regulator of the invention is HCl and the reducer is NaHSO 3 The solution and the alkali regulator are NaOH solution, and H is used as the acid regulator 2 SO 4 The acidic material and the reducing agent are sodium metabisulfite and Fe 2+ The reaction process can be realized by using alkaline substances such as slaked lime and the like as the reducing substances and the alkali regulating agent.
Claims (4)
1. A full-automatic treatment device for chromium-containing wastewater is characterized in that: the device comprises a water quantity adjusting tank (1), a reducing tank (5), a mud-water separating tank (6), a water outlet temporary storage tank (7), an acid storage tank (2), a reducing agent storage tank (3) and an alkali storage tank (4), wherein the water quantity adjusting tank (1) and the reducing tank (5) and the mud-water separating tank (6) are sequentially connected through pipelines, a reducing tank water inlet pump (8) and a mud-water separating tank water inlet pump (12) are respectively arranged in the pipelines, the reducing tank (5) is provided with a stirring device and a first liquid level sensor (16), a pH sensor (17) and an ORP sensor (18), a second liquid level sensor (19), a membrane assembly (20), an aeration mechanism (21), a diagonal pipe filler (22) and a sludge hopper (23) are arranged in the mud-water separating tank (6), the aeration mechanism (21) is positioned below the membrane assembly (20), the sludge hopper (23) is positioned at the bottom of the mud-water separating tank (6), the membrane assembly (20) is connected with the water outlet temporary storage tank (7) through a water outlet pipeline and a membrane assembly (14), the water outlet temporary storage tank (7) is also connected with the acid storage tank (3) through a backwash pump (15) and a backwash pump (20) through a backwash pump (4), an acid adding pump (9), a reducing agent pump (10) and an alkali adding pump (11) are respectively arranged in the pipeline;
the aeration mechanism (21) of the mud-water separation tank (6) comprises an aeration pipeline and an aeration head, wherein the aeration pipeline is positioned below the membrane assembly (20), the aeration head is arranged on the aeration pipeline, the aeration head is opposite to the lower part of the membrane assembly (20), the aeration pipeline is connected with a compressed air pipeline, the membrane assembly (20) is positioned above the aeration head, the aeration head is positioned above the inclined pipe filler (22), and the vertical position interval of the three components is not less than 0.3m.
2. The fully automatic treatment device for chromium-containing wastewater according to claim 1, wherein: the upper parts of the reduction tank (5) and the mud-water separation tank (6) are respectively provided with a high overflow hole, and the high overflow holes are connected with the water quantity regulating tank (1) through pipelines.
3. A treatment process using the chromium-containing wastewater fully automatic treatment apparatus according to any one of claims 1 to 2, characterized in that: the method comprises the following steps:
a. and (3) water quantity adjustment: the chromium-containing wastewater generated continuously or intermittently firstly enters a water quantity adjusting tank (1) for water quantity adjustment so as to ensure the continuity and stability of subsequent reactions;
b. a water inlet stage of the reduction tank (5): enabling the wastewater to enter a reduction tank (5) from a water quantity adjusting tank (1), and continuously stirring by a stirring device arranged in the reduction tank (5); the water inlet of the reduction tank (5) is controlled to start and stop by a first liquid level sensor (16) in the reduction tank (5), so that wastewater is pumped into the reduction tank (5) by the water quantity regulating tank (1) and the liquid level reaches a set high position;
c. acid regulating stage of the reduction tank (5): adding an acid regulator into the reduction tank (5) to stabilize the pH value of the wastewater; the pH value of the wastewater in the acid regulating stage of the reduction tank (5) is set to be 2.0, the upper limit value is set to be 2.5, the adding amount of the acid regulator is fed back and regulated through a pH sensor (17) in the reduction tank (5), when the pH value of the wastewater is reduced to the lower limit value, the acid adding pump (9) is stopped, stable stirring is carried out for 1-2min, if the pH value is not increased beyond the upper limit value, the adding of the acid regulator is stopped, and if the pH value exceeds the upper limit value, the regulating process is repeated;
d. reduction stage: after the acid regulating stage is finished, adding a reducing agent into the reducing tank (5) to control the reaction ORP value; the upper limit of the ORP set value in the reduction stage is 228mv, the lower limit is 220mv, the reduction reaction time is 25-35min, when the ORP of the wastewater reaches the upper limit of the set value, the reducer pump (10) is started, the ORP value reaches the lower limit of the set value, the acid adding pump (9) is stopped, the reduction reaction is started, and after the reducer pump (10) is started, the starting control of the acid adding pump (9) is shielded to prevent the subsequent alkali adjustment process from being disordered;
e. and (3) alkali adjustment: after the reduction stage is completed, adding an alkali regulating agent into the reduction tank (5) to stabilize the pH value of the wastewater; alkali regulation
The step is that after the reduction reaction is completed, the adding amount of an alkali adding pump (11) is regulated by pH value feedback, the pH value of the wastewater in a reduction tank (5) in the alkali regulating step is set to be 8.0, the upper limit value is set to be 8.5, when the pH value of the wastewater rises to the upper limit value, the alkali adding pump (11) is stopped, stable stirring is carried out for 1-2min, if the pH value is reduced, the adding of an alkali regulating agent is stopped, and if the pH value is reduced, the pH value is not beyond the lower limit value, the regulating process is repeated;
f. and (3) mud-water separation: after alkali adjustment is completed, the wastewater enters a mud-water separation tank (6), clear water filtered and separated by a membrane component (20) is discharged outside through a water outlet temporary storage tank (7), and sludge is trapped in the mud-water separation tank (6); the membrane module drainage pump (14) for mud-water separation is controlled by a second liquid level sensor (19) in the mud-water separation tank (6), when the liquid level detected by the second liquid level sensor (19) is at a high position, the membrane module drainage pump (14) is controlled to be started, the aeration mechanism (21) is simultaneously started to form flushing on the surface of the membrane module (20), the occurrence of surface blocking is reduced, and when the liquid level detected by the second liquid level sensor (19) is at a low position, the membrane module drainage pump (14) is stopped, and the aeration mechanism (21) is stopped;
g. standing and settling: after the mud-water separation is finished, standing is started in the mud-water separation tank (6) to enable the sludge to naturally settle to a sludge bucket, wherein the settling time is the interval time from the end of water drainage to the beginning of water drainage in the next period;
h. the reaction period is ended, and the next period of reaction is started;
j. sludge discharge: periodically discharging the sludge collected in the sludge hopper (23);
k. back flushing the membrane assembly (20): the membrane module (20) is backwashed by using the water which is temporarily stored in the water-outlet temporary storage tank (7).
4. A fully automatic treatment process for chromium-containing wastewater according to claim 3, wherein: in the step k, the back flushing of the membrane assembly (20) is carried out once after every 2-4 drainage cycles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810628643.9A CN108726805B (en) | 2018-06-19 | 2018-06-19 | Full-automatic treatment equipment and process for chromium-containing wastewater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810628643.9A CN108726805B (en) | 2018-06-19 | 2018-06-19 | Full-automatic treatment equipment and process for chromium-containing wastewater |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108726805A CN108726805A (en) | 2018-11-02 |
| CN108726805B true CN108726805B (en) | 2024-01-05 |
Family
ID=63930035
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810628643.9A Active CN108726805B (en) | 2018-06-19 | 2018-06-19 | Full-automatic treatment equipment and process for chromium-containing wastewater |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108726805B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101811793A (en) * | 2009-02-24 | 2010-08-25 | 宝山钢铁股份有限公司 | Pretreatment process of chromium-containing wastewater |
| CN202072563U (en) * | 2011-04-29 | 2011-12-14 | 肖应东 | Polychlorinated biphenyl (PCB) chromium-containing waste water reclaiming and treating system |
| CN102329024A (en) * | 2011-09-06 | 2012-01-25 | 中冶南方工程技术有限公司 | Treatment method for reducing Cr<6+> in stainless steel acid wastewater |
| CN102372400A (en) * | 2011-09-27 | 2012-03-14 | 北京机电院高技术股份有限公司 | Hazardous waste handling center waste water integrated treatment system and method |
| CN202542975U (en) * | 2012-04-09 | 2012-11-21 | 东营市东胜铸业有限责任公司 | Precious casting wastewater treatment system |
| CN107381880A (en) * | 2017-09-15 | 2017-11-24 | 环境保护部环境规划院 | A kind of mobile process system and method for hexavalent chromium polluted underground water |
| CN208776520U (en) * | 2018-06-19 | 2019-04-23 | 河钢股份有限公司 | A kind of full automatic processing equipment of chromate waste water |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9856160B2 (en) * | 2012-09-22 | 2018-01-02 | Biottta Llc | Biological two-stage contaminated water treatment system |
-
2018
- 2018-06-19 CN CN201810628643.9A patent/CN108726805B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101811793A (en) * | 2009-02-24 | 2010-08-25 | 宝山钢铁股份有限公司 | Pretreatment process of chromium-containing wastewater |
| CN202072563U (en) * | 2011-04-29 | 2011-12-14 | 肖应东 | Polychlorinated biphenyl (PCB) chromium-containing waste water reclaiming and treating system |
| CN102329024A (en) * | 2011-09-06 | 2012-01-25 | 中冶南方工程技术有限公司 | Treatment method for reducing Cr<6+> in stainless steel acid wastewater |
| CN102372400A (en) * | 2011-09-27 | 2012-03-14 | 北京机电院高技术股份有限公司 | Hazardous waste handling center waste water integrated treatment system and method |
| CN202542975U (en) * | 2012-04-09 | 2012-11-21 | 东营市东胜铸业有限责任公司 | Precious casting wastewater treatment system |
| CN107381880A (en) * | 2017-09-15 | 2017-11-24 | 环境保护部环境规划院 | A kind of mobile process system and method for hexavalent chromium polluted underground water |
| CN208776520U (en) * | 2018-06-19 | 2019-04-23 | 河钢股份有限公司 | A kind of full automatic processing equipment of chromate waste water |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108726805A (en) | 2018-11-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112154033B (en) | System and method for solids conditioning in a filtration system | |
| KR100925680B1 (en) | Apparatus for water treatment using membrane filtration automatically level controlled Floodgates | |
| CN211215583U (en) | Porous sand filter suitable for mine water | |
| CN105366850A (en) | Electronic coagulation process and facility for coal-bearing wastewater | |
| CN105731693A (en) | Integrated sewage treatment device and treatment method | |
| CN103601312A (en) | Stone material sewage treatment system and method thereof | |
| CN104860447A (en) | Novel wet-process flue gas desulfurization wastewater treatment system | |
| CN111115990A (en) | Denitrification filter tank system | |
| CN211170214U (en) | Industrial wastewater integrated treatment equipment | |
| CN108726805B (en) | Full-automatic treatment equipment and process for chromium-containing wastewater | |
| CN205653261U (en) | Sewage treating integrated equipment | |
| CN208776520U (en) | A kind of full automatic processing equipment of chromate waste water | |
| CN102276052B (en) | Backwashing apparatus and method for aeration biofilter with lightweight filter material | |
| CN201999778U (en) | Single-layer pressure integration oil eliminator | |
| CN210367291U (en) | Coal-containing wastewater treatment system | |
| CN103641259B (en) | Desulfurization wastewater treatment device | |
| CN201785271U (en) | Compressed air back-washing desulfuration wastewater treatment system | |
| CN204874103U (en) | Novel wet flue gas desulfurization effluent disposal system | |
| CN111592129A (en) | Concrete mixing plant water circulation method and system | |
| CN216106355U (en) | Treatment equipment for oily wastewater of cold rolling production line | |
| CN110776150A (en) | Industrial wastewater integrated treatment equipment | |
| CN209721815U (en) | Solid impurity remove device after saprobia degradation treatment | |
| CN214735042U (en) | Papermaking sewage treatment device | |
| CN105621725B (en) | Heavy metal-polluted acid waste water treatment system | |
| CN212713060U (en) | Inclined tube sedimentation tank and high-phosphorus wastewater treatment system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20240228 Address after: No.385, South TIYU street, Shijiazhuang City, Hebei Province Patentee after: HBIS Co.,Ltd. Country or region after: China Patentee after: Hebei Hegang Material Technology Research Institute Co.,Ltd. Address before: No.385, South TIYU street, Shijiazhuang City, Hebei Province Patentee before: HBIS Co.,Ltd. Country or region before: China |