CN110550783A - treatment system and treatment method for chromium-containing wastewater in electrolytic chlorate production system - Google Patents
treatment system and treatment method for chromium-containing wastewater in electrolytic chlorate production system Download PDFInfo
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- CN110550783A CN110550783A CN201910929311.9A CN201910929311A CN110550783A CN 110550783 A CN110550783 A CN 110550783A CN 201910929311 A CN201910929311 A CN 201910929311A CN 110550783 A CN110550783 A CN 110550783A
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- 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
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- 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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- 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
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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- 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
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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- 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
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- 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
- C02F1/70—Treatment of water, waste water, or sewage by reduction
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- 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
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- 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
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- Environmental & Geological Engineering (AREA)
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Abstract
The invention provides a treatment system and a treatment method for chromium-containing wastewater in an electrolytic chlorate production system, wherein the treatment system comprises a wastewater collection tank, a reaction tank, a sedimentation tank, a sludge storage tank and a plate-and-frame filter press which are sequentially connected, the reaction tank comprises a pH regulation grid, a reduction reaction grid, an alkali reaction grid, a PAC reaction grid and a PAM reaction grid which are sequentially connected, and the grids are connected in a step overflow mode. By adopting the treatment system, the total chromium content of the treated chromium-containing wastewater is less than or equal to 1.2mg/L, and the hexavalent chromium is less than or equal to 0.3mg/L, so that the requirements of the total chromium content of the chromium-containing wastewater of GB8978-1996 integrated wastewater discharge standard of less than or equal to 1.5mg/L and the hexavalent chromium content of less than or equal to 0.5mg/L are met. The treatment system has the advantages of short process flow, convenient operation and management, stable structure, long service life and the like, has good chromium removal effect, is beneficial to development of production, environmental protection and the like.
Description
Technical Field
The invention relates to the technical field of chromium-containing wastewater treatment, in particular to a system and a method for treating chromium-containing wastewater in an electrolytic chlorate production system.
background
When the chlorate is produced by an electrolytic method, in order to inhibit the occurrence of cathode side reaction and protect the cathode, a certain amount of sodium dichromate must be added into a saline solution before entering an electrolytic bath, and the sodium dichromate can also play a role in regulating acidity. Hexavalent chromium is highly toxic, and when its concentration reaches a certain level, it is harmful to human body, fish, livestock, crops, etc. According to the national standard GB8978-1996 Integrated wastewater discharge Standard, hexavalent chromium belongs to the first category of pollutants, and its maximum allowable discharge concentration at the discharge outlet of a workshop or a workshop treatment facility is 0.5 mg/l.
For the treatment of chromium-containing wastewater in an electrolytic chlorate production system, currently, a membrane filtration technology or a chemical precipitation method is mostly adopted. The method adopts the membrane filtration technology alone, the chromium content in the produced water of the membrane is directly influenced by the sufficiency of the chemical reaction, the regenerated treatment is needed by the adsorption method alone because the concentration of the filler is high and the filler is easy to saturate, the regenerated liquid needs to be subjected to outsourcing treatment, and the treatment cost is increased. The conclusion obtained by tests is that the content of the single membrane filtration can meet the requirement sometimes but can not meet the requirement sometimes. The dosing precipitation method is difficult to enable each treatment unit to operate under the optimal working condition due to the continuity of the reaction, and particularly when the quality of inlet water fluctuates, the change of the water quality is difficult to quickly respond by changing reaction parameters, so that the treatment effect fluctuates, and even the treatment does not reach the standard; meanwhile, the chemical precipitation method has high corrosion to equipment, and harmful gases such as chlorine dioxide and chlorine gas are generated in the treatment process. Therefore, a new treatment method for treating chromium-containing wastewater in an electrolytic chlorate production system is urgently needed.
Disclosure of Invention
Therefore, the invention provides a system and a method for treating chromium-containing wastewater in a chlorate production system by an electrolytic method, which can effectively solve the problems of high equipment corrosivity, insufficient reaction, harmful gas emission and substandard wastewater treatment existing in the conventional system and method for treating the chromium-containing wastewater in chlorate production by the electrolytic method.
The technical scheme of the invention is realized as follows: the utility model provides a processing system who contains chromium waste water in electrolysis method chlorate production system, includes waste water collection tank, reaction tank, sedimentation tank, storage mud jar and the filter press that connects gradually, waste water collection tank and reaction tank adopt intake pump and pipe connection, the reaction tank is including the pH regulation check that connects gradually, reduction reaction check, alkali reaction check, PAC reaction check and PAM reaction check, adopts the ladder overflow mode to connect between each check, and the multiplicable reaction time of ladder overflow mode promotes reaction efficiency, reduces the influence of sediment to follow-up reaction simultaneously. The waste water collecting tank collects the chlorate electrolytic tank washing and pickling waste water, hexavalent chromium reduction under the acidic condition, chromium hydroxide precipitation and separation under the alkaline condition, chromium hydroxide flocculation and mud-water separation, flocculation sludge dehydration and drying and tail gas treatment, so that the chromium-containing waste water in the electrolytic method chlorate production system is effectively treated, and a good treatment effect is obtained.
Further, the reduction reaction cells include a first reduction reaction cell and a second reduction reaction cell, so that the reduction reaction is sufficient.
Furthermore, be equipped with filtration system in advance between waste water collection tank and the reaction tank, contain more rust in the waste water, can tentatively remove the rust in the waste water through filtration system in advance, reduce the subsequent handling capacity that produces acid, alkali quantity and iron hydroxide precipitate.
Further, the waste water collecting tank comprises a washing waste water collecting tank and an acid washing waste water collecting tank, the washing waste water is pumped into the washing waste water collecting tank, the acid washing waste water is pumped into the acid washing waste water collecting tank, the fluctuation of water quality is avoided, the continuity of reaction is ensured, and each processing unit is enabled to operate under the best working condition.
Furthermore, a compressed air stirrer is arranged in the reduction reaction grid, and a compressed air stirrer is arranged in each of the first reduction reaction grid and the second reduction reaction grid, so that complete stirring is achieved, and complete reduction reaction of hexavalent chromium is further guaranteed.
furthermore, PAM reaction check all embeds there is the compressed air agitator, makes the effect of coagulating more abundant, forms great granule flocculating constituent, makes it change in to deposit and gets rid of indissolvable chromium hydroxide and suspended solid.
Furthermore, each grid of the reaction tank and the sludge storage tank are respectively connected with a dosing device, and dosing is carried out through a dosing pump.
Furthermore, pH value on-line monitoring devices are arranged in the pH adjusting grids and the alkali reaction grids and are linked with a dosing device.
furthermore, the waste water collecting tank is made of FRP materials, and the reaction tank is made of titanium alloy materials, so that equipment corrosion is better prevented.
Further, the sedimentation tank is an inclined tube sedimentation tank so as to collect sediments deposited on the bottom of the tank and pump the sediments to a sludge storage tank.
The invention also provides a method for treating chromium-containing wastewater in an electrolytic chlorate production system, which comprises the following steps of:
(1) Pumping chlorate electrolytic bath washing and pickling wastewater into a wastewater collection tank;
(2) the wastewater flows to a reaction tank, the pH value of the wastewater is adjusted to 3-5 in a pH adjusting grid, and a pH environment which is beneficial to the reaction is created for a reduction reaction grid; reducing agents are added into the first reduction reaction grid and the second reduction reaction grid to reduce hexavalent chromium into trivalent chromium, and further hexavalent chromium in the wastewater is reduced; regulating the pH value of the wastewater to 8-9 again in an alkali reaction grid, and generating insoluble chromium hydroxide precipitate from trivalent chromium under an alkaline condition; PAC is added into the PAC reaction grids, and PAM is added into the PAM reaction grids, so that the functions of coagulation and flocculation of particles in the wastewater are achieved;
(3) The waste water after the coagulation reaction enters a sedimentation tank, the sludge and water are separated through standing sedimentation, the supernatant of the sedimentation tank reaches the standard and is discharged, the sediment at the bottom of the sedimentation tank is pumped to a sludge storage tank and then is pumped to a plate-and-frame filter press for dehydration treatment, the filter press liquid of the filter press and the supernatant of the sludge storage tank flow back to a pit, the filter liquid in the pit is pumped into a waste water collecting tank, and the mud cake of the filter press is transported outside according to the regulation legal.
Further, in the step (3), PAC and PAM are added into the sludge storage tank, so that the sludge dehydration rate is improved.
Furthermore, in the step (2), the reducing agent is a saturated SO 2 solution, SO that the raw materials are easily available in a paper mill, and the reducing effect is good.
Furthermore, the tail gas washing tower of the chlorate production system is connected with an exhaust pipe of the reaction grid and is used for treating waste gas generated in the reaction tank. The top of the reaction tank is covered, and chlorine dioxide, chlorine and sulfur dioxide tail gas generated in the pH adjusting grid and other reaction grids of the reaction tank are connected to a tail gas washing tower of the chlorate production system by an electrolytic method for treatment.
Compared with the prior art, the invention has the beneficial effects that:
the treatment system for the chromium-containing wastewater in the electrolytic chlorate production system is scientifically arranged, and the treatment effect of the chromium-containing wastewater is obviously improved, wherein the grids of the reaction tank are connected in a step overflow mode, so that the reaction time is prolonged, the reaction is full, the reaction efficiency is improved, and the influence of precipitation on subsequent reactions is reduced. The total chromium content of the wastewater treated by the method is less than or equal to 1.2mg/L, and the hexavalent chromium content is less than or equal to 0.3mg/L, so that the requirements of the total chromium content of the chromium-containing wastewater of GB8978-1996 integrated wastewater discharge standard of less than or equal to 1.5mg/L and the hexavalent chromium content of less than or equal to 0.5mg/L are met. Compared with the prior art, the wastewater treatment effect is effectively improved. Moreover, the invention has low operation cost and simple operation, and is worth of wide popularization and application. The treatment system has the advantages of short process flow, convenient operation and management, stable structure, long service life and the like, has sufficient reaction, good chromium removal effect, standard wastewater discharge, reasonable treatment of harmful gas, contribution to development of production, environmental protection and the like.
Drawings
FIG. 1 is a schematic structural diagram of a system for treating chromium-containing wastewater in a chlorate production system by an electrolytic method.
FIG. 2 is a schematic flow chart of the method for treating chromium-containing wastewater in the electrolytic chlorate production system according to the invention.
Detailed Description
In order to better understand the technical content of the invention, specific examples are provided below to further illustrate the invention.
The experimental methods used in the examples of the present invention are all conventional methods unless otherwise specified.
The materials, reagents and the like used in the examples of the present invention can be obtained commercially without specific description.
Example 1
Referring to fig. 1 to 2, a system for treating chromium-containing wastewater in an electrolytic chlorate production system comprises a wastewater collection tank, a pre-filtering system, a reaction tank, a sedimentation tank, a sludge storage tank and a plate-and-frame filter press which are connected in sequence, wherein the reaction tank comprises a pH regulation grid, a reduction reaction grid, an alkali reaction grid, a PAC reaction grid and a PAM reaction grid which are connected in sequence, and the grids are connected in a step overflow mode.
Further, the reduction reaction cells comprise a first reduction reaction cell and a second reduction reaction cell; compressed air stirrers are arranged in the first reduction reaction lattice, the second reduction reaction lattice and the PAM reaction lattice; each grid of the reaction tank and the sludge storage tank are respectively connected with a dosing device; the pH value on-line monitoring device is arranged in the pH adjusting grid and the alkali reaction grid and is linked with the dosing device; the waste water collecting tank is made of FRP materials, and the reaction tank is made of titanium alloy materials; the reaction tank is connected with the sedimentation tank in a step overflow mode; the sedimentation tank is an inclined tube sedimentation tank.
example 2
Referring to fig. 1 to 2, a method for treating chromium-containing wastewater in an electrolytic chlorate production system by using the treatment system of example 1 comprises the following steps:
(1) Pumping chlorate electrolytic bath washing and pickling wastewater into a wastewater collection tank, wherein the washing wastewater is pumped into a washing wastewater collection tank, and the pickling wastewater is pumped into a pickling wastewater collection tank; the method comprises the following steps that (1) rust in wastewater is removed primarily through a pre-filtering system;
(2) the method comprises the steps of enabling waste water to flow to a reaction tank, firstly adding hydrochloric acid or caustic soda into a pH adjusting grid to adjust the pH value of the waste water to 3-5, adding a reducing agent saturated SO 2 solution into a first reduction reaction grid and a second reduction reaction grid to reduce hexavalent chromium, adding NaOH into the alkali reaction grid to adjust the pH value of the waste water to 8-9 again, generating trivalent chromium into chromium hydroxide precipitate, adding PAC into the PAC reaction grid, adding PAM into the PAM reaction grid to flocculate the waste water, and meanwhile, connecting a tail gas washing tower of a chlorate production system with an exhaust pipe of the reaction grid for treating tail gas of chlorine dioxide, chlorine gas and sulfur dioxide generated in the reaction grid;
(3) and (2) allowing the wastewater after the coagulation reaction to enter a sedimentation tank, performing mud-water separation by standing sedimentation, discharging supernatant of the sedimentation tank after reaching the standard, pumping sediment at the bottom of the sedimentation tank to a sludge storage tank, adding PAC and PAM into the sludge storage tank, pumping to a plate-and-frame filter press for dehydration treatment, returning filter press liquor of the filter press and supernatant of the sludge storage tank to a pit, pumping the filter liquor in the pit into a wastewater collection tank, and treating mud cakes of the filter press according to regulations.
the system and the method of the invention are adopted to treat the chromium-containing wastewater in the electrolytic chlorate production system, and the relevant data before and after treatment are as follows:
| Total chromium content | Hexavalent chromium content | |
| GB8978-1996 Integrated wastewater discharge Standard | ≤1.5mg/L | ≤0.5mg/L |
| Before treatment | ≥40mg/l | ≥40mg/l |
| After treatment | ≤1.2mg/L | ≤0.3mg/L |
The wastewater treated by the system reaches the discharge standard, the total chromium content of the treated wastewater is less than or equal to 1.2mg/L, and the hexavalent chromium is less than or equal to 0.3mg/L, so that the requirements of the total chromium content of the chromium-containing wastewater of GB8978-1996 integrated wastewater discharge standard of less than or equal to 1.5mg/L and the hexavalent chromium content of less than or equal to 0.5mg/L are met. The invention has low operation cost and simple operation, and is worth of wide popularization and application.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The utility model provides a processing system who contains chromium waste water in electrolysis chlorate production system which characterized in that, is including the waste water collection tank, reaction tank, sedimentation tank, storage mud jar and the filter press that connect gradually, the reaction tank is including the pH regulation check, reduction reaction check, alkali reaction check, PAC reaction check and the PAM reaction check that connect gradually, adopts the ladder overflow mode to connect between each check.
2. The system of claim 1, wherein said reduction compartments comprise a first reduction compartment and a second reduction compartment.
3. The system for treating chromium-containing wastewater in an electrolytic chlorate production system as claimed in claim 1, wherein a pre-filtration system is arranged between the wastewater collection tank and the reaction tank.
4. The system of claim 1, wherein said wastewater collection tank comprises a wash wastewater collection tank and an acid wash wastewater collection tank.
5. The system for treating chromium-containing wastewater in an electrolytic chlorate production system as claimed in claim 1, wherein compressed air stirrers are arranged in the reduction reaction cell and the PAM reaction cell; each grid of the reaction tank and the sludge storage tank are respectively connected with a dosing device; and pH value on-line monitoring devices are arranged in the pH adjusting grids and the alkali reaction grids.
6. The system for treating chromium-containing wastewater in an electrolytic chlorate production system as claimed in claim 1, wherein the wastewater collection tank is made of FRP material, and the reaction tank is made of titanium alloy material; the sedimentation tank is an inclined tube sedimentation tank.
7. A method for treating chromium-containing wastewater in an electrolytic chlorate production system, which is characterized by using the treatment system of any one of claims 1 to 6, and comprises the following steps:
(1) Pumping chlorate electrolytic bath washing and pickling wastewater into a wastewater collection tank;
(2) The wastewater flows to a reaction tank, and the pH value of the wastewater is adjusted to 3-5 in a pH adjusting grid; adding a reducing agent into the reduction reaction grid, and reducing hexavalent chromium; regulating the pH value of the wastewater to 8-9 again in the alkali reaction grid, and generating trivalent chromium into chromium hydroxide precipitate; PAC is added into the PAC reaction grid, and PAM is added into the PAM reaction grid, so that the wastewater is flocculated;
(3) And (2) allowing the wastewater after the coagulation reaction to enter a sedimentation tank, performing mud-water separation by standing and sedimentation, discharging supernatant of the sedimentation tank after reaching standards, pumping sediment at the bottom of the sedimentation tank to a mud storage tank, pumping to a plate-and-frame filter press for dehydration treatment, refluxing filter press liquor of the filter press and supernatant of the mud storage tank to a pit, pumping the filter liquor in the pit into a wastewater collection tank, and treating mud cakes of the filter press according to regulations.
8. The method as claimed in claim 7, wherein PAC and PAM are added into the sludge storage tank in step (3).
9. The method as claimed in claim 7 or 8, wherein in step (2), the reducing agent is SO 2 solution.
10. The method for treating chromium-containing wastewater in the chlorate production system by the electrolytic process according to claim 7, wherein the tail gas washing tower of the chlorate production system is connected with an exhaust pipe of the reaction grid and is used for treating waste gas generated in the reaction tank.
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| CN201910929311.9A CN110550783A (en) | 2019-09-29 | 2019-09-29 | treatment system and treatment method for chromium-containing wastewater in electrolytic chlorate production system |
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| CN201910929311.9A CN110550783A (en) | 2019-09-29 | 2019-09-29 | treatment system and treatment method for chromium-containing wastewater in electrolytic chlorate production system |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003520131A (en) * | 2000-01-19 | 2003-07-02 | アリ ペッカ シニマア | Method for treating hexavalent chromium compound in wastewater caused by metalworking |
| CN101481165A (en) * | 2009-02-20 | 2009-07-15 | 山西太钢不锈钢股份有限公司 | Process for treating chrome wastewater |
| CN105036414A (en) * | 2015-07-30 | 2015-11-11 | 上海宇海企业发展集团有限公司 | Circulating filtration treatment equipment for water |
| CN206142959U (en) * | 2016-11-04 | 2017-05-03 | 天津世纪环境工程有限公司 | Chromium -containing electroplating waste water processing apparatus |
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- 2019-09-29 CN CN201910929311.9A patent/CN110550783A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003520131A (en) * | 2000-01-19 | 2003-07-02 | アリ ペッカ シニマア | Method for treating hexavalent chromium compound in wastewater caused by metalworking |
| CN101481165A (en) * | 2009-02-20 | 2009-07-15 | 山西太钢不锈钢股份有限公司 | Process for treating chrome wastewater |
| CN105036414A (en) * | 2015-07-30 | 2015-11-11 | 上海宇海企业发展集团有限公司 | Circulating filtration treatment equipment for water |
| CN206142959U (en) * | 2016-11-04 | 2017-05-03 | 天津世纪环境工程有限公司 | Chromium -containing electroplating waste water processing apparatus |
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Application publication date: 20191210 |