CN105254107B - A kind of formalin liquid waste treatment system and its processing method - Google Patents
A kind of formalin liquid waste treatment system and its processing method Download PDFInfo
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- CN105254107B CN105254107B CN201510790139.5A CN201510790139A CN105254107B CN 105254107 B CN105254107 B CN 105254107B CN 201510790139 A CN201510790139 A CN 201510790139A CN 105254107 B CN105254107 B CN 105254107B
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Abstract
The invention discloses a kind of formalin liquid waste treatment system, including collect storage tank；Connected between allotment case and collection storage tank by the first conveyance conduit, be provided with the first agitating device in allotment case, catalyst adding mouth connects with catalyst add-on system；Retort is provided with circulation mixing duct, and retort is connected by the second conveyance conduit with allotment case, and first heater is additionally provided with retort；3rd conveyance conduit is set between the Fenton oxidation tank and retort, and Fenton oxidation tank connects with hydrogen peroxide add-on system, the regulation liquid add-on system connection of ferrous sulfate add-on system pH value；PH value on-line detector and secondary heating mechanism are provided with Fenton oxidation tank, the second agitating device is provided with Fenton oxidation tank.The processing system disclosure satisfy that the use of the formalin such as hospital, medical college discharge unit, not only make the formaldehyde fully degraded in formalin, and the organic pollution to being left after degraded is handled, and draining is met national standard.
Description
Technical field
The present invention relates to a kind of formalin liquid waste treatment system, also relates to a kind of formalin liquid waste processing side
Method.
Background technology
Formalin is a kind of anti-corrosion agent commonly used in hospital or medical college, such as in medical college, in anatomic teaching
Need to handle corpse using substantial amounts of formalin, substantial amounts of formalin waste liquid will be produced in hospital and medical college.And with
That requirement of the country to sewage drainage standard is more and more stricter, and formalin waste liquid can not be discharged directly, and formalin simultaneously
Due to degraded of the microorganism to organic matter can be suppressed, or even microorganism in water is killed, thus waste liquid can not be fed directly to sewage again
Handled in treatment plant.Therefore, the processing of formalin waste liquid caused by hospital and medical college is just relatively more urgent.
The content of the invention
The technical problems to be solved by the invention are：A kind of formalin liquid waste treatment system is provided, the processing system energy
Enough meet the use of the formalin such as hospital, medical college discharge unit, not only make the formaldehyde fully degraded of formalin, and it is right
The organic pollution left after degraded is handled, and draining is met national standard.
Another technical problem to be solved by this invention is：A kind of formalin method for treating waste liquid, the processing are provided
Method disclosure satisfy that the use of the formalin such as hospital, medical college discharge unit, not only make formalin fully degraded, and right
The organic matter of formalin waste liquid is handled, and draining is met national standard.
To solve above-mentioned first technical problem, the technical scheme is that：A kind of formalin liquid waste treatment system,
Including
Storage tank is collected, is provided with the first waste liquid entrance and the first waste liquid outlet on the collection storage tank, first waste liquid enters
Mouth and formalin waste collection pipeline communication；
Allotment case, the second waste liquid entrance, the second waste liquid outlet and catalyst adding mouth are provided with the allotment case, it is described
Connected by the first conveyance conduit between second waste liquid entrance and the first waste liquid outlet for collecting storage tank, set on the first conveyance conduit
The first delivery pump is equipped with, the first agitating device is provided with the allotment case, the catalyst adding mouth is with catalyst addition
System connection；
Retort, the 3rd waste liquid entrance, the 3rd waste liquid outlet, circulation waste liquid outlet and circulation are provided with the retort
Waste liquid entrance, circulation mixing duct is provided between the circulation waste liquid outlet and circulation waste liquid entrance, on the circulation mixing duct
Circulation conveying pump is provided with, is connected between the 3rd waste liquid entrance and the second waste liquid outlet by the second conveyance conduit, second
The second delivery pump is provided with conveyance conduit, first heater is additionally provided with retort；
Fenton oxidation tank, the 4th waste liquid entrance, the 4th waste liquid outlet, pH value regulation liquid are provided with the Fenton oxidation tank and is added
Add mouth, hydrogen peroxide adding mouth and ferrous sulfate adding mouth, be provided between the 4th waste liquid entrance and the 3rd waste liquid outlet
3rd conveyance conduit, the 3rd delivery pump is provided with the 3rd conveyance conduit, and the pH value regulation liquid adding mouth is adjusted with pH value
Liquid add-on system connects, and the hydrogen peroxide adding mouth connects with hydrogen peroxide add-on system, the ferrous sulfate adding mouth and
Ferrous sulfate add-on system connects；4th waste liquid outlet is connected with drainage, and pH is provided with the Fenton oxidation tank
It is worth on-line detector and secondary heating mechanism, the second agitating device is provided with Fenton oxidation tank.
As a kind of preferable scheme, the retort is the retort of closing, is provided with and lets out at the top of the retort
Pressure pipeline and relief valve, the relief pipeline connect the gas-phase space of retort with allotment case, and the relief valve is by retort
Gas-phase space connected with atmospheric environment.
As a kind of preferable scheme, the circulation waste liquid outlet is arranged at the bottom of retort, and the circulation waste liquid enters
Mouth is arranged at the top of retort, and the circulation mixing duct includes combined upstream pipeline section, shares mixation tube section and mixed downstream
Pipeline section, the combined upstream pipeline section are connected to the upstream end of circulation waste liquid outlet and shared mixation tube section, the shared mixing tube
One section of the conveyance conduits of Duan Zuowei the 3rd, the circulation conveying pump and the 3rd delivery pump are same delivery pump and are arranged at shared mixed
Close on pipeline section, the mixed downstream pipeline section is connected to the downstream of circulation waste liquid entrance and shared mixation tube section.
As a kind of preferable scheme, pipe-line mixer is provided with the mixed downstream pipeline section.
As a kind of preferable scheme, catalyst outlet, catalyst discharge are additionally provided with the combined upstream pipeline section
Catalyst discharge control valve is installed at mouthful.
As a kind of preferable scheme, the bottom of the collection storage tank and allotment case is provided with blow-off line, the blowdown
Pipeline connects with drainage.
As a kind of preferable scheme, the top for collecting storage tank is provided with overfall, overfall and overflow pipe
One end connects, the collection port of the other end of overflow pipe connection overflow collection tank, the outlet of the overflow collection tank with
The the first waste liquid entrance for collecting storage tank is connected by the conveyance conduit that flows back, and backflow conveying is provided with the backflow conveyance conduit
Pump.
After employing above-mentioned technical proposal, effect of the invention is：The formalin waste liquid, which is introduced into, to be collected in storage tank
Collect, then into being allocated in allotment case, during which add catalyst, catalyst typically selects lime and polyacrylamide, adjusts
Formalin waste liquid after matching somebody with somebody enters heating in retort and Formose Reaction, nHCHO → (CH occurs2O)n, and utilize circulation mixing
Pipeline mixes the waste liquid iterative cycles in retort, makes Degradation Formaldehyde more abundant, enters finally into and enter in Fenton oxidation tank
Row Fenton oxidation, the organic pollution in waste liquid is removed, makes final emission compliance.
Again because the retort is the retort of closing, relief pipeline and pressure release are provided with the top of the retort
Valve, the relief pipeline connect the gas-phase space of retort with allotment case, and the relief valve is by retort gas-phase space and greatly
Gas connects, and when the hypertonia of retort, need not can just be held by relief pipeline and relief valve, such retort using pressure
Device, reduce cost.
Again because the circulation waste liquid outlet is arranged at the bottom of retort, the circulation waste liquid entrance is arranged at retort
Top, the circulation mixing duct, which includes combined upstream pipeline section, shares mixation tube section and mixed downstream pipeline section, the upstream mixes
The upstream end that pipeline section is connected to circulation waste liquid outlet and shared mixation tube section is closed, the shared mixation tube section is as the 3rd delivery pipe
One section of road, the circulation conveying pump and the 3rd delivery pump are same delivery pump and are arranged on shared mixation tube section, under described
Trip mixation tube section is connected to the downstream of circulation waste liquid entrance and shared mixation tube section, the circulation mixing duct can with it is the 3rd defeated
Send pipeline common recycle delivery pump, further control cost.
Again because the top of the collection storage tank is provided with overfall, overfall connects with one end of overflow pipe, described
The collection port of the other end connection overflow collection tank of overflow pipe, the outlet of the overflow collection tank is with collecting the first of storage tank
Waste liquid entrance is connected by the conveyance conduit that flows back, and is provided with backflow delivery pump on the backflow conveyance conduit, the collection storage tank overflows
The formalin of stream is reflowable, avoids effusion discharge from polluting.
To solve above-mentioned first technical problem, the technical scheme is that：A kind of formalin method for treating waste liquid,
It comprises the following steps：
A, unified collect of formalin waste liquid is extremely collected in storage tank；
B, the formalin waste liquid collected in storage tank is delivered in allotment case and allocated, add calcium hydroxide and polyacrylamide
Amine is as catalyst and is stirred, polyacrylamide：Calcium hydroxide：The mol ratio of formaldehyde is 1：(1-3)×106：(5-20)
×106；
C, deployed formalin waste liquid is delivered in retort and Formose Reaction occurs, to the formalin in retort
Waste liquid heats, 0.5-3 DEG C of temperature rise speed/min, is stirred in temperature-rise period, stops adding after temperature rises to 60-90 DEG C
Heat, insulation reaction 30-60min；
D, the supernatant after processing is delivered in Fenton oxidation tank, retort bottom calcium hydroxide is collected as glycan next time
The catalyst of reaction；
E, toward addition hydrogen peroxide and ferrous sulfate in Fenton oxidation tank, for regulation pH value between 3-9, hydrogen peroxide is sub- with sulfuric acid
The mol ratio of iron is 1：(0.2-10), reaction temperature are controlled between 25-65 DEG C, reaction time 30-60min.
After employing this method, effect of the invention is：This method can carry out fully degraded with PARA FORMALDEHYDE PRILLS(91,95), utilize hydroxide
Calcium and polyacrylamide make formaldehyde Polyose degradation as far as possible as catalyst, and degradation rate is more than 98%, then by Fenton oxygen
Change Fenton oxidation in tank, reach remaining index of water outlet《Integrated wastewater discharge standard》(GB 8978-1996) grade III Standard.
As a kind of preferable scheme, the addition time of calcium hydroxide and polyacrylamide is delivered in formalin waste liquid
Before allotment case.
As a kind of preferable scheme, relief pipeline and relief valve, the relief tube are provided with the top of the retort
Road connects the gas-phase space of retort with allotment case, and retort gas-phase space and atmosphere are worked as reaction by the relief valve
When the too high air pressure made in retort of formalin waste liquid temperature of tank is more than the first warning value, relief pipeline conducting, it will react
Air venting in tank is into allotment case, and when the air pressure of retort is more than the second warning value, relief valve is again turned on making reaction
Gas in tank is emitted into air, and the second warning value is more than the first warning value.
Brief description of the drawings
The present invention is further described with reference to the accompanying drawings and examples.
Fig. 1 is the collection storage tank of the embodiment of the present invention, the pipeline connection diagram of overflow collection tank；
Fig. 2 is the pipeline connection layout drawing of the allotment case of the embodiment of the present invention；
Fig. 3 is the pipeline connection diagram of retort；
Fig. 4 is the pipeline connection diagram of Fenton oxidation tank；
In accompanying drawing：1. collect storage tank；2. the first waste liquid entrance；3. the first waste liquid outlet；4. overfall；5. overflow pipe；
6. overflow collection tank；7. flow back delivery pump；8. flow back conveyance conduit；9. liquid level gauge；10. the first delivery pump；11. Liquid level
Device；12. the first conveyance conduit；13. blow-off line；14. sewage draining exit；15. allotment case；16. the first agitating device；17. liquid level control
Device processed；18. relief pipeline；19. the second conveyance conduit；20. the second delivery pump；21. retort；22. rinse mouth；23. relief valve；
24. fluid level controller；25. first heater；26. sample tap；27. catalyst outlet；28. combined upstream pipeline section；Under 29.
Swim mixation tube section；30. pipe-line mixer；31. share mixation tube section；32. the 3rd conveyance conduit；33. the 3rd delivery pump；It is 34. fragrant
Pause oxidation tank；35. rinse mouth；36. hydrogen peroxide add-on system；37. ferrous sulfate add-on system；38. the 4th waste liquid outlet；
39. fluid level controller；40. secondary heating mechanism；41.pH values adjust liquid add-on system；42. the second agitating device；43. sampling
Mouthful.
Embodiment
Below by specific embodiment, the present invention is described in further detail.
Embodiment 1
As shown in Figures 1 to 4, a kind of formalin liquid waste treatment system, including
Storage tank 1 is collected, the first waste liquid entrance 2 and the first waste liquid outlet 3 are provided with the collection storage tank 1, described first is useless
Liquid entrance 2 and formalin waste collection pipeline communication；The formalin waste collection pipeline is directly arranged with formalin waste liquid
Go out the blow-off line connection of unit, collected for example, the formalin blow-off line of hospital and medical college is aggregated into storage tank 1.
The bottom of the collection storage tank 1 is provided with sewage draining exit 14, and blowoff valve is provided with sewage draining exit 14 and is connected with blowdown by blowoff valve
Pipeline 13, the blow-off line 13 connect with drainage.
As shown in figure 1, the top for collecting storage tank 1 is provided with overfall 4, one end of overfall 4 and overflow pipe 5 connects
Logical, the other end of the overflow pipe 5 connects the collection port of overflow collection tank 6, the outlet of the overflow collection tank 6 and collection
First waste liquid entrance 2 of storage tank 1 is connected by the conveyance conduit 8 that flows back, and backflow delivery pump is provided with the backflow conveyance conduit 8
7。
In order to improve the automation of whole processing system, collect and be provided with fluid level controller 11 on storage tank 1, and collecting
The outside of storage tank 1 is provided with the liquid level gauge 9 of convenient observation, and fluid level controller 11 can be according to the Liquid level Fu Er for collecting storage tank 1
The entrance of Malin's waste liquid, when the liquid level for collecting storage tank 1 reaches high level, formalin waste liquid stops entering.
As shown in Fig. 2 the second waste liquid entrance, the second waste liquid outlet and catalyst adding mouth, institute are provided with allotment case 15
State and connected between the second waste liquid entrance and the first waste liquid outlet 3 for collecting storage tank 1 by the first conveyance conduit 12, the first delivery pipe
The first delivery pump 10 is provided with road 12, the first agitating device 16, the catalyst adding mouth are provided with the allotment case 15
Connected with catalyst add-on system；The catalyst adding mouth can be added by the way of pipeline or directly existed
The direct labor suitable for reading addition of allotment case 15.Fluid level controller 17 is also provided with the allotment case 15, the fluid level controller 17 is controllable
The start-stop of the first delivery pump 10 is made, when the liquid level of allotment case 15 is less than high level, the first delivery pump 10 is persistently opened formal
Woods waste liquid is delivered in allotment case 15, and when the liquid level of allotment case 15 reaches high level, the conveying of the control of fluid level controller 17 first
Pump 10 is closed, and stops feed liquor.First agitating device 16 is realized using churned mechanically mode, including stirring motor and stirring
Blade, stirring vane are rotatablely installed in allotment case 15 vertically, and stirring motor control stirring vane rotates, it is of course also possible to adopt
With other agitating modes, such as air stirring.
The 3rd waste liquid entrance, the 3rd waste liquid outlet, circulation waste liquid outlet and circulation are provided with tank 21 as shown in figure 3, answering
Waste liquid entrance, circulation mixing duct is provided between the circulation waste liquid outlet and circulation waste liquid entrance, on the circulation mixing duct
Circulation conveying pump is provided with, is connected between the 3rd waste liquid entrance and the second waste liquid outlet by the second conveyance conduit 19, the
The second delivery pump 20 is provided with two conveyance conduits 19, first heater 25 is additionally provided with retort 21；Retort 21 is set
Rinse mouth 22, sample tap 26 and fluid level controller 24 are equipped with, the circulation mixing duct can be real using independent pipe-line system
It is existing, the formalin waste liquid circulation of retort 21 is mixed during the course of the reaction.Certainly, in order to save cost, system is made more
Rationally, the circulation waste liquid outlet is arranged at the bottom of retort 21, and the circulation waste liquid entrance is arranged at the upper of retort 21
Portion, the circulation mixing duct include combined upstream pipeline section 28, share mixation tube section 31 and mixed downstream pipeline section 29, the upstream
Mixation tube section 28 is connected to the upstream end of circulation waste liquid outlet and shared mixation tube section 31, and the shared mixation tube section 31 is used as the
One section of three conveyance conduits 32, the circulation conveying pump and the 3rd delivery pump 33 are same delivery pump and are arranged at shared mixing tube
In section 31, the mixed downstream pipeline section 29 is connected to the downstream of circulation waste liquid entrance and shared mixation tube section 31.The downstream
Pipe-line mixer 30 is provided with mixation tube section 29.Catalyst outlet 27 is additionally provided with the combined upstream pipeline section 28, is urged
Catalyst discharge control valve is installed, when retort 21 is successive reaction processing, catalyst can be deposited at agent outlet 27
Stay in retort 21, realize continuous catalysis, and when retort 21 is interrupted in use, can utilize catalyst outlet 27 will
Catalyst export is used convenient next time, and online pH meter and temperature sensor are may be provided with retort 21, convenient to detect retort
21 pH value and temperature.
The retort 21 is the retort 21 of closing, and the top of the retort 21 is provided with relief pipeline 18 and pressure release
Valve 23, the relief pipeline 18 connect the gas-phase space of retort 21 with allotment case 15, and the relief valve 23 is by retort 21
Gas-phase space connected with atmospheric environment.The Double-pressure-relief of retort 21 is realized using relief pipeline 18 and relief valve 23, is reduced
The requirement of retort 21.Certainly, the waste liquid in retort 21 needs to be supplied to Fenton oxidation tank 34, therefore, liquid in retort 21
Face declines, and therefore, one-way breather valve is provided with retort 21, certain air pressure is provided when also liquid level declines.
As shown in figure 4, Fenton oxidation tank 34, the 4th waste liquid entrance is provided with the Fenton oxidation tank 34, the 4th waste liquid goes out
Mouth 38, pH value regulation liquid adding mouth, hydrogen peroxide adding mouth and ferrous sulfate adding mouth, the 4th waste liquid entrance and the three wastes
Liquid is provided with the 3rd conveyance conduit 32 between outlet, and the 3rd delivery pump 33, the pH value are provided with the 3rd conveyance conduit 32
Regulation liquid adding mouth connects with pH value regulation liquid add-on system 41, the hydrogen peroxide adding mouth and hydrogen peroxide add-on system 36
Connection, the ferrous sulfate adding mouth connect with ferrous sulfate add-on system 37；4th waste liquid outlet 38 and drainage
Connect, be provided with pH value on-line detector and secondary heating mechanism 40 on the Fenton oxidation tank 34, set in Fenton oxidation tank 34
The second agitating device 42 is equipped with, the second agitating device 42 equally uses churned mechanically mode, first heater 25 and second
Heater 40 can use electrically heated mode.Equally, fluid level controller 39, rinse mouth 35 are also provided with Fenton oxidation tank 34
With sample tap 43, and temperature sensor is also provided with.And pH value regulation liquid typically uses hydrochloric acid or sulfuric acid.
The course of work of the processing of this formalin is：
1. Fu Er is expired into woods waste collection to collecting in storage tank 1, when collecting the liquid level in storage tank 1 and attaining to a high place, stopping
Waste liquid enters, if control system breaks down, the liquid level of collection storage tank 1 continues will be from overflow after rise reaches overfall 4
Pipeline 5 flows into overflow collection tank 6, can be provided with alarm probe on overflow pipe 5, once there is waste liquid flowing on overflow pipe 5,
So alarm starts, and prompts to collect the too high overflow of the liquid level of storage tank 1；
2. calcium hydroxide and polyacrylamide are added in allotment case 15 in advance, then the first delivery pump 10 continues to receive
Formalin waste liquid in collection storage tank 1 is sent in allotment case 15, when the waste liquid in allotment case 15 attains to a high place, fluid level controller
17 the first delivery pumps 10 of control stop feed liquor.Persistently stirring makes catalyst and formal to the first agitating device 16 in allotment case 15
Woods waste liquid is sufficiently mixed.
3. deployed formalin waste liquid is delivered in retort 21 using the second delivery pump 20, the liquid level of retort 21
Attain to a high place, control the second delivery pump 20 to stop feed liquor.
4. open valve F3 and F4, shutoff valve F2 and F5, start the 3rd delivery pump 33, start first heater 25, when up to
Stop heating after to assigned temperature, then shutoff valve F3, valve F4 and the 3rd delivery pump 33, insulation reaction, after processing terminates, start
Valve F2 and F5, start the 3rd delivery pump 33, the waste liquid that formaldehyde (HCHO) has been degraded is squeezed into Fenton oxidation tank.Processing terminates, can
Open catalyst discharge control valve to take out Ca (OH) 2 for use next time, if multiple batches of continuous processing, Ca (OH) 2 can be protected
Stay in wet oxidation reactor, used for lower batch cycle.
5. hydrochloric acid (HCL) is added in Fenton oxidation tank 34, for adjusting pH value in reactor；Add hydrogen peroxide and sulfuric acid
Ferrous iron carries out Fenton oxidation, and its reaction principle is：
Fe2++H2O2→Fe3++OH-+HO·
Fe3++H2O2+OH-→Fe2++H2O+HO·
Fe3++H2O2→Fe2++H++HO2
HO2+H2O2→H2O+O2+HO·
6. processing opens valve F6 after terminating, the waste liquid handled well is discharged into drainage.Waste water formaldehyde after processing
(HCHO) degradation rate >=98%.Remaining index of water outlet reaches《Integrated wastewater discharge standard》(GB 8978-1996) three-level mark
It is accurate.
Embodiment 2
A kind of formalin method for treating waste liquid, it comprises the following steps：
A, unified collect of formalin waste liquid is extremely collected in storage tank 1；
B, the formalin waste liquid collected in storage tank 1 is delivered in allotment case 15 and allocated, add calcium hydroxide and poly- third
Acrylamide is as catalyst and is stirred, polyacrylamide：Calcium hydroxide：The mol ratio of formaldehyde is 1：106：5×106；Hydrogen-oxygen
The addition time of change calcium and polyacrylamide is before formalin waste liquid is delivered to allotment case 15.
C, deployed formalin waste liquid is delivered in retort 21 and Formose Reaction occurs, to the Fu Er in retort 21
Malin's waste liquid heats, 0.5 DEG C/min of temperature rise speed, is stirred in temperature-rise period, stops heating after temperature rises to 60 DEG C,
Insulation reaction 60min；The top of the retort 21 is provided with relief pipeline 18 and relief valve 23, and the relief pipeline 18 will be anti-
The gas-phase space of tank 21 is answered to be connected with allotment case 15, the relief valve 23 is by the gas-phase space of retort 21 and atmosphere, when anti-
When answering the too high air pressure made in retort 21 of formalin waste liquid temperature of tank 21 more than the first warning value, relief pipeline 18 is led
It is logical, by the air venting in retort 21 into allotment case 15, when the air pressure of retort 21 is more than the second warning value, relief valve
23 are again turned on making the gas in retort 21 be emitted into air, and the second warning value is more than the first warning value.
D, the supernatant after processing is delivered in Fenton oxidation tank 34, the bottom calcium hydroxide of retort 21 is collected as next time
The catalyst of Formose Reaction, the calcium hydroxide is sustainable to be remained in retort 21, is added again after can also discharging；
E, toward addition hydrogen peroxide and ferrous sulfate in Fenton oxidation tank 34, regulation makes pH value be equal to 3, and hydrogen peroxide is sub- with sulfuric acid
The mol ratio of iron is 1：0.2, reaction temperature is controlled between 25 DEG C, reaction time 60min, the wastewater to reach standard row after Fenton's reaction
Put.
Embodiment 3
The embodiment is substantially the same manner as Example 2, and simply parameter has adjusted.
A kind of formalin method for treating waste liquid, it comprises the following steps：
A, unified collect of formalin waste liquid is extremely collected in storage tank 1；
B, the formalin waste liquid collected in storage tank 1 is delivered in allotment case 15 and allocated, add calcium hydroxide and poly- third
Acrylamide is as catalyst and is stirred, polyacrylamide：Calcium hydroxide：The mol ratio of formaldehyde is 1：3×106：20×106；
The addition time of calcium hydroxide and polyacrylamide is before formalin waste liquid is delivered to allotment case 15.
C, deployed formalin waste liquid is delivered in retort 21 and Formose Reaction occurs, to the Fu Er in retort 21
Malin's waste liquid heats, 3 DEG C/min of temperature rise speed, is stirred in temperature-rise period, stops heating after temperature rises to 90 DEG C, protects
Temperature reaction 30min；The top of the retort 21 is provided with relief pipeline 18 and relief valve 23, and the relief pipeline 18 will react
The gas-phase space of tank 21 is connected with allotment case 15, and the gas-phase space of retort 21 and atmosphere are worked as reaction by the relief valve 23
When the too high air pressure made in retort 21 of formalin waste liquid temperature of tank 21 is more than the first warning value, relief pipeline 18 turns on,
By the air venting in retort 21 into allotment case 15, when the air pressure of retort 21 is more than the second warning value, relief valve 23
It is again turned on making the gas in retort 21 be emitted into air, the second warning value is more than the first warning value.
D, the supernatant after processing is delivered in Fenton oxidation tank 34, the bottom calcium hydroxide of retort 21 is collected as next time
The catalyst of Formose Reaction, the calcium hydroxide is sustainable to be remained in retort 21, is added again after can also discharging；
E, toward addition hydrogen peroxide and ferrous sulfate in Fenton oxidation tank 34, regulation makes pH value be equal to 9, and hydrogen peroxide is sub- with sulfuric acid
The mol ratio of iron is 1：10, reaction temperature is controlled between 65 DEG C, reaction time 30min, the wastewater to reach standard row after Fenton's reaction
Put.
Embodiment described above is only the description to the preferred embodiment of the present invention, not as the limit to the scope of the invention
It is fixed, the various modifications made on the basis of design spirit of the present invention is not departed to technical solution of the present invention and transformation, it all should fall
In the protection domain for entering claims of the present invention determination.
Claims (8)
- A kind of 1. formalin liquid waste treatment system, it is characterised in that：IncludingCollect storage tank, be provided with the first waste liquid entrance and the first waste liquid outlet on the collection storage tank, the first waste liquid entrance with Formalin waste collection pipeline communication；Allotment case, is provided with the second waste liquid entrance, the second waste liquid outlet and catalyst adding mouth in the allotment case, and described second Connected by the first conveyance conduit between waste liquid entrance and the first waste liquid outlet for collecting storage tank, be provided with the first conveyance conduit First delivery pump, the first agitating device is provided with the allotment case, and the catalyst adding mouth connects with catalyst add-on system It is logical；Retort, the 3rd waste liquid entrance, the 3rd waste liquid outlet, circulation waste liquid outlet and circulation waste liquid are provided with the retort Entrance, circulation mixing duct is provided between the circulation waste liquid outlet and circulation waste liquid entrance, is set on the circulation mixing duct There is circulation conveying pump, connected between the 3rd waste liquid entrance and the second waste liquid outlet by the second conveyance conduit, the second conveying The second delivery pump is provided with pipeline, first heater is additionally provided with retort；Fenton oxidation tank, the 4th waste liquid entrance, the 4th waste liquid outlet, pH value regulation liquid addition are provided with the Fenton oxidation tank Mouthful, hydrogen peroxide adding mouth and ferrous sulfate adding mouth, the is provided between the 4th waste liquid entrance and the 3rd waste liquid outlet Three conveyance conduits, the 3rd delivery pump, the pH value regulation liquid adding mouth and pH value regulation liquid are provided with the 3rd conveyance conduit Add-on system connects, and the hydrogen peroxide adding mouth connects with hydrogen peroxide add-on system, the ferrous sulfate adding mouth and sulphur The ferrous add-on system connection of acid；4th waste liquid outlet is connected with drainage, and pH value is provided with the Fenton oxidation tank On-line detector and secondary heating mechanism, the second agitating device is provided with Fenton oxidation tank；The retort is the retort of closing, and relief pipeline and relief valve, the pressure release are provided with the top of the retort Pipeline connects the gas-phase space of retort with allotment case, and the relief valve connects the gas-phase space of retort and atmospheric environment It is logical；The circulation waste liquid outlet is arranged at the bottom of retort, and the circulation waste liquid entrance is arranged at the top of retort, institute Stating circulation mixing duct includes combined upstream pipeline section, shares mixation tube section and mixed downstream pipeline section, and the combined upstream pipeline section connects Be connected to circulation waste liquid outlet and shared mixation tube section upstream end, the shared mixation tube section as the 3rd conveyance conduit one Section, the circulation conveying pump and the 3rd delivery pump are same delivery pump and are arranged on shared mixation tube section, the mixed downstream Pipeline section is connected to the downstream of circulation waste liquid entrance and shared mixation tube section.
- A kind of 2. formalin liquid waste treatment system as claimed in claim 1, it is characterised in that：On the mixed downstream pipeline section It is provided with pipe-line mixer.
- A kind of 3. formalin liquid waste treatment system as claimed in claim 2, it is characterised in that：On the combined upstream pipeline section Catalyst outlet is additionally provided with, catalyst discharge control valve is installed at catalyst outlet.
- A kind of 4. formalin liquid waste treatment system as claimed in claim 3, it is characterised in that：The collection storage tank and allotment The bottom of case is provided with blow-off line, and the blow-off line connects with drainage.
- A kind of 5. formalin liquid waste treatment system as claimed in claim 4, it is characterised in that：The top for collecting storage tank Overfall is provided with, overfall connects with one end of overflow pipe, the other end connection overflow collection tank of the overflow pipe Collection port, the outlet of the overflow collection tank are connected with collecting the first waste liquid entrance of storage tank by the conveyance conduit that flows back, institute State and be provided with backflow delivery pump on backflow conveyance conduit.
- 6. a kind of formalin method for treating waste liquid, it comprises the following steps：A, unified collect of formalin waste liquid is extremely collected in storage tank；B, the formalin waste liquid collected in storage tank is delivered in allotment case and allocated, added calcium hydroxide and polyacrylamide is made For catalyst and it is stirred, polyacrylamide：Calcium hydroxide：The mol ratio of formaldehyde is 1：(1-3)×106：(5-20)×106；C, deployed formalin waste liquid is delivered in retort and Formose Reaction occurs, to the formalin waste liquid in retort Heat, 0.5-3 DEG C of temperature rise speed/min, be stirred in temperature-rise period, stop heating after temperature rises to 60-90 DEG C, protect Temperature reaction 30-60min；D, the supernatant after processing is delivered in Fenton oxidation tank, retort bottom calcium hydroxide is collected as Formose Reaction next time Catalyst；E, toward adding hydrogen peroxide and ferrous sulfate in Fenton oxidation tank, regulation pH value between 3-9, hydrogen peroxide and ferrous sulfate Mol ratio is 1：(0.2-10), reaction temperature are controlled between 25-65 DEG C, reaction time 30-60min.
- A kind of 7. formalin method for treating waste liquid as claimed in claim 6, it is characterised in that：Calcium hydroxide and polyacrylamide The addition time of amine is before formalin waste liquid is delivered to allotment case.
- A kind of 8. formalin method for treating waste liquid as claimed in claim 7, it is characterised in that：Set at the top of the retort Relief pipeline and relief valve are equipped with, the relief pipeline connects the gas-phase space of retort with allotment case, and the relief valve will Retort gas-phase space and atmosphere, when the too high air pressure made in retort of the formalin waste liquid temperature of retort is more than During one warning value, relief pipeline conducting, by the air venting in retort into allotment case, when the air pressure of retort is more than second During warning value, relief valve is again turned on making the gas in retort to be emitted into air, and the second warning value is more than the first warning value.
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