CN218089228U - Processing apparatus that silver mercury chromium heavy metal was retrieved in laboratory waste liquid - Google Patents
Processing apparatus that silver mercury chromium heavy metal was retrieved in laboratory waste liquid Download PDFInfo
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- CN218089228U CN218089228U CN202222190913.7U CN202222190913U CN218089228U CN 218089228 U CN218089228 U CN 218089228U CN 202222190913 U CN202222190913 U CN 202222190913U CN 218089228 U CN218089228 U CN 218089228U
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Abstract
The utility model discloses a processing apparatus that silver mercury chromium heavy metal was retrieved in laboratory waste liquid, including the waste liquid collecting pit, the feed liquor pump, the oxidation pond, first pH value equalizing basin, second pH value equalizing basin, third pH value equalizing basin, the sedimentation tank, the flowing back pump, the electrolytic bath, hydrogen peroxide solution storage bucket, acidizing fluid storage bucket subassembly, alkali lye storage bucket subassembly, short hair agent storage bucket and controller, the waste liquid collecting pit, the feed liquor pump, the oxidation pond, first pH value equalizing basin, second pH value equalizing basin, third pH value equalizing basin, sedimentation tank and flowing back pump communicate in proper order from front to back, hydrogen peroxide solution storage bucket, short hair agent storage bucket all is linked together with the oxidation pond, alkali lye storage bucket subassembly and oxidation pond, first pH value equalizing basin, the second pH value equalizing basin is linked together, acidizing fluid storage bucket group price and second pH value equalizing basin, the third pH value equalizing basin is linked together, the electrolytic bath is linked together with first pH value equalizing basin, the feed liquor pump, flowing back pump and electrolytic bath all are connected with controller looks electricity.
Description
Technical Field
The utility model relates to a technical field of laboratory waste liquid treatment especially relates to a processing apparatus that silver mercury chromium heavy metal was retrieved in laboratory waste liquid.
Background
With the rapid development of science and technology and the continuous progress of education in China, the number of scales of laboratories is continuously increased, and meanwhile, the problem of laboratory pollution is highlighted. The waste liquid generated in the laboratory contains a large amount of organic matters and heavy metals, and the heavy metals complex the organic matters to form metal complexes which are difficult to decompose.
Application document with publication number CN106348490A discloses a laboratory heavy metal waste liquid treatment all-in-one machine, which comprises a waste liquid storage barrel, an alkali adding pump, an acid adding pump, a trapping agent adding pump, a polyaluminium chloride adding pump, a water inlet pump, a vacuum pump, a sludge discharge pump, a drain valve, a sludge filter cylinder, a stirrer, a reactor, an alkali storage tank, an acid storage tank, a heavy metal trapping agent storage tank, a polyaluminium chloride storage tank and a gas-water separator. However, the treatment integrated machine only adopts an acid-base neutralization and precipitation treatment process to carry out precipitation flocculation treatment on heavy metals in the waste liquid, and has the following problems: the generated heavy metal precipitate has more impurities, low purity, incapability of being directly recycled, incomplete heavy metal recovery and high residue.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a processing apparatus that silver mercury chromium heavy metal was retrieved in laboratory waste liquid.
According to an aspect of the utility model, a processing apparatus that silver mercury chromium heavy metal was retrieved in laboratory waste liquid is provided, including the waste liquid collecting pit, the feed liquor pump, the oxidation pond, first pH value equalizing basin, second pH value equalizing basin, the third pH value equalizing basin, the sedimentation tank, the flowing back pump, the electrolytic bath, hydrogen peroxide solution storage bucket, acidizing fluid storage bucket subassembly, alkali lye storage bucket subassembly, promoter storage bucket and controller, the waste liquid collecting pit, the feed liquor pump, the oxidation pond, first pH value equalizing basin, the second pH value equalizing basin, the third pH value equalizing basin, sedimentation tank and flowing back pump communicate in proper order from front to back, hydrogen peroxide solution storage bucket, promoter storage bucket all is linked together with the oxidation pond, alkali lye storage bucket subassembly and oxidation pond, first pH value equalizing basin, the second pH value equalizing basin is linked together, acidizing fluid storage bucket subassembly and second pH value equalizing basin, the third pH value equalizing basin is linked together, the electrolytic bath is linked together with first pH value equalizing basin, the feed liquor pump, flowing back pump and electrolytic bath all are connected with the controller phase electricity.
In some embodiments, the utility model discloses still include the multiunit and measure agitating unit, the multiunit is measured agitating unit and is installed respectively in oxidation pond, first pH value equalizing basin, second pH value equalizing basin, third pH value equalizing basin, measures agitating unit and includes pH meter and agitator, and pH meter and agitator are connected with controller looks electricity respectively.
In some embodiments, the utility model discloses still include multiunit filter pressing device, communicate in proper order through multiunit filter pressing device between oxidation pond, first pH value equalizing basin, second pH value equalizing basin and the third pH value equalizing basin, filter pressing device includes filter-pressing feed liquor pump and pressure filter, and third pH value equalizing basin is linked together through sedimentation tank feed liquor pump with the sedimentation tank, and filter-pressing feed liquor pump, pressure filter, sedimentation tank feed liquor pump are connected with controller looks electricity respectively.
In some embodiments, the utility model discloses still include the electrolysis circulating pump, the one end and the electrolytic bath of electrolysis circulating pump are linked together, and the other end is linked together with first pH value equalizing basin, and the electrolysis circulating pump is connected with controller looks electricity.
In some embodiments, the utility model discloses still include that the electro-catalysis removes ammonia pond and electro-catalysis circulating pump, the one end and the third pH value equalizing basin in electro-catalysis removes the ammonia pond are linked together, and the other end is linked together through electro-catalysis circulating pump and third pH value equalizing basin, and electro-catalysis removes ammonia pond and electro-catalysis circulating pump and is connected with controller looks electricity respectively.
In some embodiments, the utility model discloses still include the heavy metal and catch agent storage bucket, the heavy metal is caught the agent storage bucket and is equipped with the heavy metal and catches the agent flow valve to catch the agent flow valve through the heavy metal and be linked together with third pH value equalizing basin, the heavy metal is caught the agent flow valve and is connected with controller looks electricity.
In some embodiments, the utility model discloses still include sedimentation tank filter-pressing device, sedimentation tank filter-pressing device includes sedimentation tank filter-pressing pump and sedimentation tank filter-pressing, and sedimentation tank filter-pressing machine's one end is linked together with the sedimentation tank, and the other end is linked together with sedimentation tank filter-pressing pump's one end, and sedimentation tank filter-pressing pump's the other end is linked together with the bottom of sedimentation tank, and sedimentation tank filter-pressing pump and sedimentation tank filter-pressing machine are connected with the controller looks electricity respectively.
In some embodiments, an anode and a cathode are provided within the electrolytic cell, the anode being a ruthenium iridium titanium anode and the cathode being a titanium cathode.
In some embodiments, the hydrogen peroxide storage barrel is provided with a hydrogen peroxide flow valve and is communicated with the oxidation pond through the hydrogen peroxide flow valve, the acid storage barrel assembly comprises an acid storage barrel, an acid flow valve and two acid communication valves, one end of the acid flow valve is communicated with the acid storage barrel, the other end of the acid flow valve is communicated with the two acid communication valves in parallel, the two acid communication valves are communicated with the second pH value adjusting pond and the third pH value adjusting pond in a one-to-one correspondence manner, the alkali liquor storage barrel assembly comprises an alkali liquor storage barrel, an alkali liquor flow valve and three alkali liquor communicating valves, one end of the alkali liquor flow valve is communicated with the alkali liquor storage barrel, the other end of the alkali liquor flow valve is communicated with the three alkali liquor communicating valves in parallel, the three alkali liquor communicating valves are communicated with the oxidation pond, the first pH value adjusting pond and the second pH value adjusting pond in one-to-one correspondence, and the hydrogen peroxide flow valve, the acid liquor flow valve, the alkali liquor flow valve, the acid liquor communicating valve and the alkali liquor communicating valves are respectively electrically connected with the controller.
In some embodiments, the trigger reservoir is provided with a trigger flow valve and is in communication with the oxidation basin through the trigger flow valve, the trigger flow valve being in electrical communication with the controller.
The utility model has the advantages that: the utility model discloses a set up the oxidation pond, first pH value equalizing basin, second pH value equalizing basin, third pH value equalizing basin and sedimentation tank, adopt the oxidation in proper order, the electrolysis, in, the heavy metal that contains in the processes such as electro-catalysis ammonia removal come the separation laboratory waste liquid, the oxidation reaction in the utilization oxidizing basin has destroyed the complex that heavy metal and organic matter formed, make multiple heavy metal exist with the free ion state, the follow-up reaction of being convenient for generates corresponding sediment, and utilize the copper of multistage sediment filter-pressing in with the waste liquid, silver is retrieved with the form of simple substance, mercury is with the sulfate, the iodide, the form of sulphide is retrieved, chromium, iron is retrieved with the form of hydroxide. The utility model discloses an each reaction tank arranges rationally in proper order in the device, loops through oxidation, electrolysis, neutralization, electro-catalysis and removes the ammonia process, avoids the mutual interference between the various heavy metal ions to realize the segmentation of silver, copper, mercury, chromium, iron heavy metal in to the waste liquid and deposit and recycle, the purity of the mercury salt of retrieving, molysite, chromate all can reach chemical purity more than 99%, and then guarantee that final heavy metal content in the play aquatic reaches emission standard.
Drawings
Fig. 1 is a schematic structural diagram of a processing apparatus for recovering silver, mercury and chromium heavy metals from laboratory waste liquid according to an embodiment of the present invention.
Fig. 2 is a block diagram of a processing apparatus for recovering silver, mercury and chromium heavy metals from laboratory waste liquid according to an embodiment of the present invention.
Fig. 3 is a flow chart of the utility model, which is used for treating the acidic waste liquid, of the treatment device for recovering the silver, mercury and chromium heavy metals in the laboratory waste liquid.
Fig. 4 is a flow chart of the utility model, which is used for treating alkaline waste liquid, of the treatment device for recovering silver, mercury and chromium from waste liquid in a laboratory.
Detailed Description
The present invention will be described in further detail with reference to examples.
Referring to fig. 1-4, the utility model provides a processing apparatus that silver mercury chromium heavy metal was retrieved in laboratory waste liquid, including waste liquid collecting pit 1, feed liquor pump 2, oxidation pond 3, first pH value equalizing basin 4, second pH value equalizing basin 5, third pH value equalizing basin 6, sedimentation tank 7, sedimentation tank feed liquor pump 8, positive displacement pump 9, electrolytic bath 10, electrolytic bath storage bucket 101, acidizing fluid storage bucket subassembly 102, alkali lye storage bucket subassembly 103, promoter storage bucket 104, four groups measure agitating unit 105, three filter pressing devices of group 106, electrolysis circulating pump 107, electro-catalysis removes ammonia pond 108, electro-catalysis circulating pump 109, heavy metal capture agent storage bucket 110, sedimentation tank filter pressing device 111 and controller 112.
The waste liquid collecting tank 1, the liquid inlet pump 2, the oxidation pond 3, the first pH value adjusting tank 4, the second pH value adjusting tank 5, the third pH value adjusting tank 6, the sedimentation tank liquid inlet pump 8, the sedimentation tank 7 and the liquid discharging pump 9 are sequentially communicated from front to back. Wherein the oxidation pond 3, the first pH value adjusting pond 4, the second pH value adjusting pond 5 and the third pH value adjusting pond 6 are sequentially communicated through three groups of filter pressing devices 106. Each set of filter press apparatuses 106 includes a filter press feed pump 1061 and a filter press 1062.
The hydrogen peroxide solution storage barrel 101 is provided with a hydrogen peroxide solution flow valve 1011 which is communicated with the oxidation pond 3 through the hydrogen peroxide solution flow valve 1011. The hair promoter storage barrel 104 is provided with a hair promoter flow valve 1041 which is communicated with the oxidation pond 3 through the hair promoter flow valve 1041. The hair promoter contained in the hair promoter tank 104 is a short chain carbohydrate containing C1-C6, such as: methanol, acetaldehyde, and the like. The alkali liquor storage barrel assembly 103 comprises an alkali liquor storage barrel 1031, an alkali liquor flow valve 1032 and three alkali liquor communication valves 1033. One end of the alkali liquor flow valve 1032 is communicated with the alkali liquor storage barrel 1031, and the other end is respectively communicated with the three alkali liquor communication valves 1033 in parallel. The three alkali liquor communicating valves 1033 are correspondingly communicated with the oxidation tank 3, the first pH value adjusting tank 4 and the second pH value adjusting tank 5 one by one.
One end of the electrolytic circulating pump 107 is communicated with the first pH adjusting tank 4, the other end is communicated with one end of the electrolytic cell 10, and the other end of the electrolytic cell 10 is communicated with the first pH adjusting tank 4. An anode and a cathode are arranged in the electrolytic cell 10, wherein the anode is a ruthenium-iridium-titanium anode, and the cathode is a titanium cathode. The acid storage barrel assembly 102 includes an acid storage barrel 1021, an acid flow valve 1022, and two acid communication valves 1023. One end of the acid liquor flow valve 1022 is communicated with the acid liquor storage barrel 1021, the other end of the acid liquor flow valve is communicated with the two acid liquor communication valves 1023 in parallel, and the two acid liquor communication valves 1023 are communicated with the second pH value adjusting tank 5 and the third pH value adjusting tank 6 in a one-to-one correspondence mode.
One end of the electro-catalysis ammonia removal tank 108 is communicated with the third pH value adjusting tank 6, and the other end is communicated with the third pH value adjusting tank 6 through an electro-catalysis circulating pump 109. The heavy metal scavenger storage bucket 110 is provided with a heavy metal scavenger flow valve 1101, which is in communication with the third pH adjusting tank 6 through the heavy metal scavenger flow valve 1101.
The sedimentation tank filter-pressing device 111 comprises a sedimentation tank filter-pressing pump 1111 and a sedimentation tank filter-pressing machine 1112, one end of the sedimentation tank filter-pressing machine 1112 is communicated with the sedimentation tank 7, the other end of the sedimentation tank filter-pressing pump 1111 is communicated with one end of the sedimentation tank filter-pressing pump 1111, and the other end of the sedimentation tank filter-pressing pump 1111 is communicated with the bottom of the sedimentation tank 7.
Four sets of measuring and stirring devices 105 are respectively arranged in the oxidation pond 3, the first pH value adjusting pond 4, the second pH value adjusting pond 5 and the third pH value adjusting pond 6, and each set of measuring and stirring devices 105 comprises a pH meter 1051 and a stirrer 1052.
The liquid inlet pump 2, the pH meter 1051, the stirrer 1052, the filter-pressing liquid inlet pump 1061, the filter press 1062, the liquid discharge pump 9, the electrolytic cell 10, the electrolytic circulating pump 107, the electro-catalysis ammonia removal tank 108, the electro-catalysis circulating pump 109, the sedimentation tank filter-pressing pump 1111, the sedimentation tank filter-pressing 1112, the hydrogen peroxide flow valve 1011, the acid flow valve 1022, the acid communication valve 1023, the alkali flow valve 1032, the alkali communication valve 1033, the promoter flow valve 1041 and the heavy metal trapping agent flow valve 1101 are respectively and electrically connected with the controller 112.
The utility model discloses a processing apparatus both can be used for handling the acid waste liquid in laboratory, also can be used for handling the alkaline waste liquid in laboratory.
When the utility model is used for treating the acid waste liquid, the detection waste liquid containing various heavy metals in the strong acid generated in the laboratory is collected in the waste liquid collection pool, the acid waste liquid in the waste liquid collection pool contains 10 to 15 percent of free sulfuric acid, 0.5 to 2g/L of Hg, 1 to 2g/L of Cr, 1 to 2g/L of ferrum, 0 to 50mg/L of Cu, 100 to 500mg/L of COD and less than 1 of pH value.
The controller opens the liquid inlet pump, the liquid inlet pump pumps the acidic waste liquid in the waste liquid collecting tank into the oxidation tank, the alkali liquor flow valve and the alkali liquor communicating valve correspondingly communicated with the oxidation tank are opened, the alkali liquor storage barrel adds alkali liquor, such as sodium hydroxide solution, into the oxidation tank through the alkali liquor flow valve and the corresponding alkali liquor communicating valve, the alkali liquor is rapidly stirred, the pH value of the waste liquid in the oxidation tank is adjusted to 2-3, and at the moment, the acidic waste liquid is heated to 60-80 ℃ due to the heat generated by a large amount of acid-base neutralization reaction. In the step, the alkali adding speed is controlled, the temperature is controlled to be below 80 ℃, rapid stirring is needed, and the precipitate which is generated at the beginning is dissolved until the addition of the alkali liquor is finished and yellow mercuric sulfate precipitate is generated. In this step, if the addition of the base is too fast, the initial precipitate formed was a mixture of silver chloride and mercury sulfate. If the initial precipitate is not dissolved, chloride ions and silver ions in the acidic waste liquid form precipitate, and the precipitate is mixed into mercury sulfate precipitate, so that the recovered mercury sulfate has low purity, and the recovery value is reduced.
In the step, the temperature is raised to 60-80 ℃, reaction conditions are provided for subsequent Fenton reaction and Fenton-like reaction, and most of mercury ions contained in the acidic waste liquid are separated out in the form of yellow mercury sulfate dihydrate precipitates along with the change of the pH value of the acidic waste liquid. The mercury contained in the acid waste liquid is mainly recovered in the form of mercury sulfate, the purity of the mercury sulfate reaches more than 99 percent, and the mercury sulfate can be directly recycled, while the mercury sulfide recovered by the existing mercury sulfide method has the purity of only about 80 percent and can not be directly recycled.
Along with the heat release of the acid-base neutralization reaction, the temperature of the acid waste liquid is raised to 60-80 ℃, the oxidation-reduction reaction can be accelerated, hexavalent chromium ions contained in the acid waste liquid are reduced into trivalent chromium ions, and ferrous ions are oxidized into trivalent ferric ions.
The hydrogen peroxide storage barrel quantitatively adds hydrogen peroxide into the oxidation pond through an opened hydrogen peroxide flow valve, and the volume of the hydrogen peroxide accounts for 0.5-1% of the volume of the acidic waste liquid. Meanwhile, the promoter storage barrel adds a promoter, such as methanol, into the oxidation pond through a promoter flow valve in an open state, so that the volume concentration of the promoter in the acidic waste liquid is 100-500mg/L. At the moment, ferrous ions contained in the acidic waste liquid are used as a catalyst to catalyze the acidic waste liquid to perform a Fenton reaction with hydrogen peroxide, silver ions, copper ions and ferric ions contained in the acidic waste liquid are used as catalysts to catalyze the acidic waste liquid to perform a Fenton-like reaction with the hydrogen peroxide, so that the complex heavy metal in the acidic waste liquid is decomposed into free heavy metal to the maximum extent, organic matters in the acidic waste liquid are thoroughly decomposed, and the reaction time is 10-30min. After the reaction is finished, removing generated mercury sulfate dihydrate precipitate from the waste liquid in the oxidation tank through a filter pressing device, removing most of mercury ions, discharging the filtered acid waste liquid into a first pH value adjusting tank, wherein the content of the mercury ions in the filtered acid waste liquid is lower than 10mg/L, the COD value is lower than 20mg/L, and the complex heavy metal is converted into an ionic state.
The electrolytic circulating pump circularly pumps the acidic waste liquid in the first pH value regulating tank into the electrolytic tank, the electrolytic tank electrolyzes the acidic waste liquid, and the current density is 0.6A/cm during electrolytic treatment 2 The electrolysis time is 2-3h, and silver ions and copper ions contained in the acid waste liquid are recovered. The recovery rate of silver ions by electrolytic treatment in the step is about 50%. The electrolytic treatment process is arranged after the oxidation treatment, silver and copper simple substances are recovered for electrolysis, the interference of metal complex compounds is eliminated, the purity of metal precipitates recovered by electrolysis is improved, a small amount of hydrogen peroxide remained in the oxidation treatment process can be removed by the electrolytic treatment, and ferrous ions in the acidic waste liquid are completely converted into ferric ions, so that the subsequent removal and the recovery of iron are facilitated.
And after the electrolysis is finished, adding a sodium hydroxide solution into the first pH value adjusting tank by using an alkaline storage barrel, adjusting the pH value of the acidic waste liquid to about 4, reacting for 5-10min to generate ferric hydroxide precipitate, removing the ferric hydroxide precipitate by using a filter pressing device, and pumping the filtered acidic waste liquid into a second pH value adjusting tank. Because of the low COD value environment (the COD value is lower than 20 mg/L) of the acid waste liquid, when the pH value is about 4, ferric ions in the acid waste liquid form ferric hydroxide precipitate, the ferric hydroxide precipitate is separated out, and the ferric ions in the acid waste liquid are removed after the ferric hydroxide precipitate is filtered.
And adding a sodium hydroxide solution into the second pH value adjusting tank by using an alkali liquor storage barrel to adjust the pH value of the acidic waste liquid to about 7, reacting for 5-10min, generating chromium hydroxide precipitate by using trivalent chromium ions in the waste liquid, removing the chromium hydroxide precipitate by using a filter pressing device, and removing the chromium ions in the waste liquid. And pumping the filtered waste liquid into a third pH value adjusting tank.
The waste liquid in the third pH value adjusting tank is pumped into an electro-catalysis ammonia removal tank by an electro-catalysis circulating pump to remove ammonia nitrogen by electricity, so that organic matters are further removed, the COD value of the waste liquid is reduced, and the interference of the complex formed by ammonium radicals and metal ions is eliminated; after ammonia nitrogen is removed through electricity, the heavy metal catching agent storage barrel is used for adding the heavy metal catching agent sodium sulfide into the third pH value adjusting tank, mercury ions in the waste liquid are combined with sulfur ions to generate mercury sulfide precipitate, residual silver ions and free chloride ions in the waste liquid form silver chloride precipitate, all silver ions in the waste liquid are removed, and the content of metal ions in the waste liquid filtered by the filter pressing device is ensured to reach the discharge standard. Removing mercury sulfate precipitate and silver chloride precipitate by a filter pressing device, pumping the filtered waste liquid into a precipitation tank, wherein the content of mercury ions in the filtered waste liquid is lower than 0.05mg/L.
And (3) in the sedimentation tank, the waste liquid stays for 1-2h, so that fine suspended matters in the waste liquid, such as mercury sulfide generated in the third pH value adjusting tank, are precipitated and precipitated, the supernatant is discharged by a liquid discharge pump, the precipitate at the bottom of the sedimentation tank is pumped into a sedimentation filter press by a sedimentation filter press pump to be filtered, and the filtrate flows back into the sedimentation tank. In the step, the content of mercury ions is further reduced, so that the content of mercury ions in the supernatant is lower than 0.005mg/L. The COD value of the supernatant is less than 20mg/L, and the organic matters are basically removed.
The utility model discloses the processing to acid waste liquid has following improvement: (1) By arranging the trigger storage barrel in the oxidation tank, in the oxidation process, besides the traditional oxidant hydrogen peroxide, a small amount of trigger (namely C1-C6 short-chain carbohydrate) is added, so that a small amount of alkyl free radicals can be generated, and the heavy metal complex is promoted to be thoroughly degraded into free metal ions, thereby greatly improving the precipitation effect and recovery purity of heavy metals, and greatly reducing the control difficulty of the emission index of the heavy metal ions;
(2) Mercury is mainly recovered in the form of mercuric sulfate, the purity reaches more than 99 percent, and the mercuric sulfide can be directly recycled, while in the prior art, the mercuric sulfide recovered by a mercuric sulfide method has the purity of only about 80 percent, has more impurities and can not be directly recycled;
(3) The utility model discloses the structure order of well device is treatment process flow order promptly, can not change at will: (1) in the oxidation process, before the precipitation process, if the mercury sulfate is directly precipitated without being oxidized, other impurities can be mixed in the recovered mercury sulfate precipitate, so that the purity of the mercury sulfate is greatly reduced;
(2) the precipitation process must be between the electrolysis processes, and the mercuric sulfate precipitation must be completely precipitated between the electrolysis processes so as to prevent the mercury from being separated out due to electrolysis and influence the purity of silver and copper simple substances;
(3) the precipitation of the iron salt must be carried out after the oxidation step and before the precipitation of the chromium salt, since the precipitation conditions of the chromium salt coincide with those of the iron salt, and the simultaneous precipitation of the two would result in poor purity.
Use the utility model discloses when handling the alkaline waste liquid, collect the waste liquid with the strong alkaline detection waste liquid that the laboratory produced and collect the pond in, the alkaline waste liquid in the waste liquid collection pond contains free alkali 5%, contains Hg 5-10g/L, ammonia nitrogen and a small amount of organic matter, and the COD value is 200-1000mg/L, and the pH value is greater than 14.
The controller starts a liquid inlet pump, the liquid inlet pump pumps the alkaline waste liquid in the waste liquid collecting tank into an oxidation tank, the alkaline waste liquid is subjected to filter pressing by a filter pressing device and then enters a first pH value adjusting tank, the alkaline waste liquid is subjected to filter pressing by the filter pressing device and then enters a second pH value adjusting tank, an acid liquid, such as sulfuric acid, is added into the second pH value adjusting tank through an acid liquid flow valve and a corresponding acid liquid communicating valve, the pH value of the alkaline waste liquid is adjusted to be about 9, the reaction time is 5-10min, at the moment, mercury ions generate red mercuric iodide precipitate, the mercuric iodide precipitate is removed through the filter pressing device, and the filtered alkaline waste liquid is pumped into a third pH value adjusting tank. The purity of the mercury iodide precipitate recovered in the step is more than 99%, and the mercury iodide precipitate can be directly recycled.
In the third pH value adjusting tank, the alkaline waste liquid is pumped into an electro-catalysis ammonia removal tank by an electro-catalysis circulating pump to electrically remove ammonia nitrogen, further remove organic matters, reduce the COD value of the waste liquid and eliminate the interference of the complex formed by ammonium radicals and metal ions; after ammonia nitrogen is removed through electrolysis, sulfuric acid is added into the third pH value adjusting tank through the acid storage tank, the pH value is adjusted to be about 8, heavy metal capture agent sodium sulfide is added into the third pH value adjusting tank through the heavy metal capture agent storage tank, mercury sulfide precipitate is generated, the mercury sulfide precipitate is removed through a filter pressing device, and filtered alkaline waste liquid is pumped into the settling tank.
In the sedimentation tank, the alkaline waste liquid stays for 1-2h, so that fine suspended matters in the waste liquid can be conveniently precipitated, the supernatant is discharged by a liquid discharge pump, the precipitate at the bottom of the sedimentation tank is pumped into a sedimentation filter press by a sedimentation filter press pump to be filtered, and the filtrate flows back into the sedimentation tank. In the step, the content of mercury ions is further reduced, so that the content of mercury ions in the supernatant is lower than 0.005mg/L. The COD value of the supernatant is less than 20mg/L, and the organic matters are basically removed.
The utility model discloses the processing to alkaline waste liquid has following improvement: mercury in the alkaline waste liquid is subjected to twice precipitation recovery, firstly converted into mercuric iodide, and completely separated out, wherein the purity of the mercuric iodide is over 99 percent, and the mercuric iodide can be directly recycled; and the second time, the mercury sulfide is precipitated and separated out in the form of mercury sulfide, so that the recycling efficiency of mercury is greatly improved.
The above description is only some embodiments of the present invention, and for those skilled in the art, a plurality of modifications and improvements can be made without departing from the inventive concept, and these modifications and improvements all belong to the protection scope of the present invention.
Claims (10)
1. The device is characterized by comprising a waste liquid collecting pool, a liquid inlet pump, an oxidation pool, a first pH value adjusting pool, a second pH value adjusting pool, a third pH value adjusting pool, a sedimentation pool, a liquid discharge pump, an electrolytic pool, a hydrogen peroxide storage barrel, an acid liquid storage barrel assembly, an alkali liquid storage barrel assembly, a hair promoter storage barrel and a controller, wherein the waste liquid collecting pool, the liquid inlet pump, the oxidation pool, the first pH value adjusting pool, the second pH value adjusting pool, the third pH value adjusting pool, the sedimentation pool and the liquid discharge pump are sequentially communicated from front to back, the hydrogen peroxide storage barrel and the hair promoter storage barrel are communicated with the oxidation pool, the alkali liquid storage barrel assembly is communicated with the oxidation pool, the first pH value adjusting pool and the second pH value adjusting pool, the acid liquid storage barrel assembly is communicated with the second pH value adjusting pool and the third pH value adjusting pool, the electrolytic pool is communicated with the first pH value adjusting pool, and the liquid inlet pump, the liquid discharge pump and the electrolyte control phase controller are electrically connected with the liquid discharge pool.
2. The device for recycling silver, mercury and chromium heavy metals in laboratory waste liquid according to claim 1, further comprising a plurality of sets of measuring and stirring devices, wherein the plurality of sets of measuring and stirring devices are respectively installed in the oxidation tank, the first pH value adjusting tank, the second pH value adjusting tank and the third pH value adjusting tank, the measuring and stirring devices comprise a pH meter and a stirrer, and the pH meter and the stirrer are respectively and electrically connected with the controller.
3. The device for recycling silver, mercury and chromium heavy metals in laboratory waste liquid according to claim 1, further comprising a plurality of sets of pressure filtration devices and a sedimentation tank liquid inlet pump, wherein the oxidation tank, the first pH value adjusting tank, the second pH value adjusting tank and the third pH value adjusting tank are sequentially communicated through the plurality of sets of pressure filtration devices, each pressure filtration device comprises a pressure filtration liquid inlet pump and a pressure filter, the third pH value adjusting tank is communicated with the sedimentation tank through the sedimentation tank liquid inlet pump, and the pressure filtration liquid inlet pump, the pressure filter and the sedimentation tank liquid inlet pump are respectively electrically connected with the controller.
4. The device for recycling silver, mercury and chromium heavy metals in laboratory waste liquid according to claim 1, further comprising an electrolysis circulating pump, wherein one end of the electrolysis circulating pump is communicated with the electrolytic cell, the other end of the electrolysis circulating pump is communicated with the first pH value adjusting tank, and the electrolysis circulating pump is electrically connected with the controller.
5. The device for recycling silver, mercury and chromium heavy metals in laboratory waste liquid according to claim 1, further comprising an electro-catalytic ammonia removal tank and an electro-catalytic circulating pump, wherein one end of the electro-catalytic ammonia removal tank is communicated with the third pH value adjusting tank, the other end of the electro-catalytic ammonia removal tank is communicated with the third pH value adjusting tank through the electro-catalytic circulating pump, and the electro-catalytic ammonia removal tank and the electro-catalytic circulating pump are respectively and electrically connected with the controller.
6. The device for recycling silver, mercury and chromium heavy metals in laboratory waste liquid according to claim 1, further comprising a heavy metal trapping agent storage barrel, wherein the heavy metal trapping agent storage barrel is provided with a heavy metal trapping agent flow valve and is communicated with the third pH value adjusting tank through the heavy metal trapping agent flow valve, and the heavy metal trapping agent flow valve is electrically connected with the controller.
7. The device for recovering silver, mercury and chromium heavy metals in laboratory waste liquid according to claim 1, further comprising a sedimentation tank filter pressing device, wherein the sedimentation tank filter pressing device comprises a sedimentation tank filter pressing pump and a sedimentation tank filter pressing machine, one end of the sedimentation tank filter pressing machine is communicated with the sedimentation tank, the other end of the sedimentation tank filter pressing machine is communicated with one end of the sedimentation tank filter pressing pump, the other end of the sedimentation tank filter pressing pump is communicated with the bottom of the sedimentation tank, and the sedimentation tank filter pressing pump and the sedimentation tank filter pressing machine are respectively and electrically connected with the controller.
8. The device for recovering silver, mercury and chromium heavy metals in laboratory waste liquid according to claim 1, wherein an anode and a cathode are arranged in the electrolytic cell, the anode is a ruthenium-iridium-titanium anode, and the cathode is a titanium cathode.
9. The device for recycling the silver, mercury and chromium heavy metals in the laboratory waste liquid according to claim 1, wherein a hydrogen peroxide flow valve is arranged in the hydrogen peroxide storage barrel and is communicated with the oxidation pond through the hydrogen peroxide flow valve, the acid storage barrel assembly comprises an acid storage barrel, an acid flow valve and two acid communication valves, one end of the acid flow valve is communicated with the acid storage barrel, the other end of the acid flow valve is communicated with the two acid communication valves in parallel, the two acid communication valves are communicated with the second pH adjustment pond and the third pH adjustment pond in a one-to-one correspondence manner, the alkali storage barrel assembly comprises an alkali storage barrel, an alkali flow valve and three alkali communication valves, one end of the alkali flow valve is communicated with the alkali storage barrel, the other end of the alkali flow valve is communicated with the three alkali communication valves in parallel, the three alkali communication valves are communicated with the oxidation pond, the first pH adjustment pond and the second pH adjustment pond in a one-to one correspondence manner, and the alkali flow valve, the acid flow valve, the alkali flow valve, the acid flow valve and the acid communication valve are respectively electrically connected with the controller.
10. The device for recycling mercury-chromium heavy metals in laboratory waste liquid according to claim 1, wherein the promoter storage barrel is provided with a promoter flow valve and is communicated with the oxidation pond through the promoter flow valve, and the promoter flow valve is electrically connected with the controller.
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Inventor after: Jiang Jiefang Inventor after: Liu Peng Inventor after: Huang Haibin Inventor after: Wang Hanfei Inventor after: Li Yanliang Inventor after: Lv Xiaomei Inventor after: Liao Jianbo Inventor after: Wu Jinhua Inventor after: Liang Chunlian Inventor before: Liu Peng Inventor before: Jiang Jiefang Inventor before: Huang Haibin Inventor before: Wang Hanfei Inventor before: Li Yanliang Inventor before: Lv Xiaomei Inventor before: Liao Jianbo Inventor before: Wu Jinhua Inventor before: Liang Chunlian |