CN217578582U - Inorganic silica gel waste water's processing system - Google Patents
Inorganic silica gel waste water's processing system Download PDFInfo
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- CN217578582U CN217578582U CN202220841328.6U CN202220841328U CN217578582U CN 217578582 U CN217578582 U CN 217578582U CN 202220841328 U CN202220841328 U CN 202220841328U CN 217578582 U CN217578582 U CN 217578582U
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Abstract
The utility model belongs to the technical field of chemical wastewater treatment, in particular to a treatment system of inorganic silica gel production wastewater, which comprises an electric desiliconization device, an immersed ultrafiltration device, a reverse osmosis device and an evaporation device which are communicated; the reverse osmosis device is provided with a clear water outlet and a concentrated water outlet, and is also externally connected with a clear water tank, the clear water tank is communicated with the clear water outlet, and the evaporation device is provided with an evaporation device inlet and an evaporation condensed water outlet; the concentrated water outlet is communicated with the inlet of the evaporation device; the evaporation condensed water outlet is communicated with the clear water tank. Through the system, the soluble silicon in the silica gel production wastewater can be effectively removed, the problem of scaling blockage of the ultrafiltration membrane and the reverse osmosis membrane is well solved, the service time of the membrane is greatly prolonged, the treatment cost is reduced, and zero emission of the inorganic silica gel production wastewater is realized.
Description
Technical Field
The utility model belongs to the technical field of chemical wastewater treatment, especially, relate to a processing system of inorganic silica gel waste water.
Background
Different from precipitated white carbon black, the pH value of the silica gel production wastewater is 2.0-2.5, the content of sodium sulfate in the wastewater is 2.0-2.2%, and the content of soluble silicon is 200-300 PPM. The prior art mainly has two methods for treating the silica gel production wastewater. The first method adopts direct evaporation and has the disadvantages of large investment and high operation cost. A production system for producing 30000 tons of silica gel in one year adopts multi-effect direct evaporation or MVR direct evaporation, the one-time investment is more than 6000 ten thousand yuan, the cost of each ton of silica gel is increased by more than 800 yuan, and the production cost accounts for about 30% of the production cost, which is unacceptable for production enterprises. The second method adopts membrane separation concentration and evaporation, because the silica gel production wastewater contains a certain amount of silica, mainly colloidal silica and soluble silica, especially because of the existence of the soluble silica, silica scale can be formed on the membrane after the membrane separation equipment operates for hours, and thus, silica blockage is caused. No matter the ultrafiltration membrane or the reverse osmosis membrane is used, once the silicon plug is formed, the prior art means cannot be cleaned, and only a new membrane can be discarded and replaced, so that a pure membrane separation and concentration mode is fundamentally infeasible. Even if flocculation precipitation is carried out by adding a chemical silicon removal medicament before membrane separation, soluble silicon in wastewater cannot be fully removed, and in addition, the chemical silicon removal medicament has high cost, enterprises cannot bear high operating cost, and no production enterprise at home and abroad really realizes zero emission of silica gel production wastewater treatment so far.
From the above, how to provide a low-cost treatment system for inorganic silica gel production wastewater, so as to realize zero discharge of silica gel production wastewater treatment, is a technical problem to be solved urgently at present.
SUMMERY OF THE UTILITY MODEL
In view of the above disadvantages of the prior art, the present invention provides a system for treating wastewater from inorganic silica gel production, comprising an electric desiliconization device, an immersed ultrafiltration device, a reverse osmosis device, and an evaporation device; the reverse osmosis device is provided with a clear water outlet and a concentrated water outlet, and is also externally connected with a clear water tank, the clear water tank is communicated with the clear water outlet, and the evaporation device is provided with an evaporation device inlet and an evaporation condensed water outlet; the concentrated water outlet is communicated with the inlet of the evaporation device; the evaporation condensed water outlet is communicated with the clear water tank.
In some embodiments of the present invention, the electric desiliconization device comprises a water inlet, a cavity and a water outlet which are sequentially in fluid communication; a sewage draining outlet is formed in the bottom of the cavity; an anode plate and a cathode plate are arranged in the cavity; the device also comprises an electrode plate anode interface connected with the anode plate and an electrode plate cathode interface connected with the cathode plate.
In some embodiments of the invention, the volume of the cavity is 0.3m 3 ～0.4m 3 。
In some embodiments of the present invention, the electrolytic current of the electric desiliconization apparatus is 100 to 200A.
In some embodiments of the present invention, the electrolytic voltage of the electric desiliconization apparatus is 24 to 36V.
In some embodiments of the present invention, the silicon removing device further comprises a wastewater tank, and a sedimentation wastewater tank is arranged between the wastewater tank and the electric silicon removing device; and an alkali liquor storage unit is also arranged on a communicating pipeline of the sedimentation wastewater tank and the electric silicon removal device.
In some embodiments of the present invention, the communication pipeline of the electrical desiliconization apparatus and the immersed ultrafiltration apparatus is further provided with a desiliconization agent storage unit and a coagulant aid storage unit.
In some embodiments of the present invention, a storage unit for the high silica scale inhibitor is further disposed on the communication pipeline between the immersion type ultrafiltration device and the reverse osmosis device.
The utility model discloses an in some embodiments, be equipped with the sludge outlet on the submergence formula ultrafiltration device, the system still includes the sludge impoundment, sludge outlet and sludge impoundment intercommunication.
The utility model discloses an in some embodiments, the mud pond along mud output direction in proper order with fold spiral shell machine and mud loading intercommunication.
The technical scheme has the following beneficial effects:
through the system, the soluble silicon in the silica gel production wastewater can be effectively removed, the problem of scale blockage of an ultrafiltration membrane and a reverse osmosis membrane is well solved, the service time of the membrane is greatly prolonged, the treatment cost is reduced, and zero emission of the inorganic silica gel production wastewater is realized.
Drawings
FIG. 1 shows a schematic structural diagram of a system for treating wastewater from inorganic silica gel production according to the present invention.
Fig. 2 shows a schematic structural view of the electric desiliconization device of the present invention.
Reference numerals
1. Waste water tank
2. Sedimentation wastewater pool
3. Electric silicon removing device
31. Water inlet
32. Cavity body
33. Water outlet
34. Drain outlet
35. Anode plate
36. Negative plate
37. Electrode plate anode interface
38. Cathode interface of electrode plate
4. Immersed ultrafiltration device
41. Sludge outlet
5. Reverse osmosis device
51. Clear water outlet
52. Concentrated water outlet
6. Evaporation device
7. Clear water tank
8. Sludge tank
9. Spiral shell stacking machine
10. Mud loading vehicle
11. Alkali liquor storage unit
12. Desiliconization agent storage unit
13. Coagulant aid storage unit
14. High silicon scale inhibitor storage unit
Detailed Description
In the description of the present invention, it should be noted that the structure, the proportion, the size, etc. shown in the attached drawings of the present specification are only used for matching with the content disclosed in the specification, so as to be known and read by the people familiar with the technology, and are not used to limit the practical limit condition of the present invention, so that the present invention does not have the essential meaning in the technology, and the modification of any structure, the change of the proportion relation or the adjustment of the size all should still fall within the scope that the technical content disclosed in the present invention can cover without affecting the function that the present invention can produce and the purpose that can be achieved. While the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like refer to orientations or positional relationships illustrated in the drawings, which are used for convenience to describe the invention and to simplify the description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered limiting of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
As shown in figure 1, the embodiment of the utility model provides a processing system of inorganic silica gel waste water, including the electricity that communicates except that silicon device 3, submergence formula ultrafiltration device 4, reverse osmosis unit 5, evaporation plant 6. The reverse osmosis device 5 is provided with a clear water outlet 51 and a concentrated water outlet 52, and is also externally connected with a clear water tank 7, and the clear water tank 7 is communicated with the clear water outlet 51; the evaporation device 6 is provided with an evaporation device inlet 61 and an evaporation condensed water outlet 62; the concentrated water outlet 52 is communicated with the evaporation device inlet 61; the evaporation condensate outlet 62 is communicated with the clean water tank 7. After passing through the reverse osmosis unit 5, clear water is obtained from the clear water outlet 51, which can be stored in the clear water tank 7 for reuse in the production process. The water containing impurities in the concentrated water outlet 52 is further evaporated, and the evaporated condensed water after evaporation flows into the clear water tank 7 from the evaporated condensed water outlet. The product obtained after evaporation was anhydrous sodium sulfate.
In the system for treating inorganic silica gel production wastewater provided by the embodiment of the present invention, as shown in fig. 2, the electric desiliconization apparatus 3 comprises a water inlet 31, a cavity 32 and a water outlet 33 which are sequentially in fluid communication; a sewage draining outlet 34 is arranged at the bottom of the cavity 32; an anode plate 35 and a cathode plate 36 are arranged in the cavity 32; and further comprises an electrode plate anode interface 37 connected with the anode plate 35 and an electrode plate cathode interface 38 connected with the cathode plate 36.
The embodiment of the utility model provides an among the processing system of inorganic silica gel waste water that provides, like fig. 2, electricity desiliconization device 3 is according to electrochemical electrolysis principle's the desiliconization equipment of drafting, and its theory of operation is: the metal is used as an electrode, the silica gel production wastewater is electrolyzed between the electrode plates, chemical substances generated by the metal electrode during electrolysis and the colloidal silicon and soluble silicon in the silica gel production wastewater generate a series of complex electrochemical reactions, or are removed by oxidation, or are separated out by dissociation, or are taken out of a water body by secondary gas, or are subjected to reduction reaction, and the like, so that the removal of the colloidal silicon and the soluble silicon is finally realized.
In a specific implementation scenario, the specific flow of the electrolytic silicon removal treatment is briefly described as follows: under the condition of certain current and voltage, on one hand, fe dissolved out from the metal anode 2+ 、Al 3+ (the preferred use of the present invention is to dissolve Fe 2+ Electrochemical device) plasma is hydrolyzed in water to generate flocculation, and H is generated by the anode and the cathode 2 And O 2 A good air floating effect is generated due to a large amount of bubbles, and simultaneously O 2 The method also has an oxidation effect on the colloidal silicon and soluble silicon in the wastewater from the production of the silica gel and other substances to be removed for pollution. The colloidal silica and soluble silica in the silica gel production wastewater treated by the electrolytic chemical flocculation equipment are changed into flocs such as metal oxides, hydroxides and the like, and are removed by a precipitation mode.
The embodiment of the utility model provides an among the processing system of inorganic silica gel waste water, the volume of cavity 32 is 0.3m 3 ～0.4m 3 、0.3m 3 ～0.35m 3 Or 0.35m 3 ～0.4m 3 And the like.
The embodiment of the utility model provides an among the processing system of inorganic silica gel waste water, the electrolytic current of electricity desiliconization device 3 is 100 ~ 200A. The electrolytic voltage of the electric silicon removing device 3 is 24-36V.
The system for treating the inorganic silica gel production wastewater provided by the embodiment of the utility model also comprises a wastewater tank 1, and a sedimentation wastewater tank 2 is arranged between the wastewater tank 1 and an electric silicon removal device 3; and an alkali liquor storage unit 11 is also arranged on a communicating pipeline of the sedimentation wastewater tank 2 and the electric silicon removal device 3. In some embodiments, a waste water pump is further arranged on the communication pipeline between the sedimentation waste water tank 2 and the electric desiliconization device 3. The silica gel production wastewater containing sodium sulfate produced in the silica gel production procedure enters a wastewater tank 1, then enters a precipitation wastewater tank 2 for natural sedimentation, and the wastewater after the impurities and part of precipitates are removed by precipitation is sent to an electric desiliconization device 3 through a wastewater pump. The lye storage units 11 are provided with alkali. Since the pH value of the wastewater is about 2.5, and the wastewater is not suitable for electrolysis, the wastewater needs to be neutralized by adding alkali before entering the electric desiliconization device 3.
The embodiment of the utility model provides an among the processing system of inorganic silica gel waste water, still be equipped with desiliconization agent storage unit 12 and coagulant aid storage unit 13 on the communicating pipe way of electricity desiliconization device 3 and submergence formula ultrafiltration device 4. The silicon removing agent storage unit 12 contains a silicon removing agent. The coagulant aid storage unit 13 contains a coagulant aid. Flocs such as metal oxides, hydroxides and the like formed by the silicon removal treatment of the silicon electrolysis device can be matched with a small amount of silicon removal agent and coagulant aids (or reducing agents and other auxiliaries with the same action), so that the specific surface area of the particles of the flocs is increased, the activity is improved, the stability is good, and the precipitation effect is better.
The embodiment of the utility model provides an among the processing system of inorganic silica gel waste water, submergence formula ultrafiltration device 4 can separate flocculation thing and salt solution, obtains the ultrafiltration treatment water. The immersed ultrafiltration membrane device is membrane separation equipment adopting an immersed ultrafiltration membrane, can be directly immersed in a water tank, and is flushed by disturbance of air, so that the ultrafiltration membrane can still stably run when the concentration of suspended matters in the wastewater in the silica gel production reaches 1-2%. Meanwhile, the immersed ultrafiltration component adopts a slotted design, so that suspended matters containing silicide, which are left after electric desiliconization flocculation precipitation, can be quickly separated from the membrane component without being accumulated in the ultrafiltration membrane, and the flux of the membrane is ensured. Therefore, the immersed ultrafiltration membrane device has stronger impact resistance to the water quality fluctuation of the silica gel production wastewater, can not be blocked even after long-time operation, and also overcomes the problem of incomplete flocculation reaction of the traditional ultrafiltration membrane because the retention time of suspended matters in the membrane pool is prolonged. In some embodiments, the submerged ultrafiltration membrane device can be selected from the apparatuses in the 201720311859.3 patent, for example.
The embodiment of the utility model provides an among the processing system of inorganic silica gel waste water, immersion formula ultrafiltration device 4 and reverse osmosis unit 5's communicating pipe still is equipped with high silica scale inhibitor storage unit 14 on the road. Wherein, the scale inhibitor storage unit is provided with a high-silicon scale inhibitor which is beneficial to controlling scale and sediment in a reverse osmosis membrane concentration system and reducing particle blockage.
In the system for treating wastewater from inorganic silica gel production provided in the embodiments of the present invention, in some embodiments, the reverse osmosis device 5 may be, for example, a membrane made of dow's membrane, brand name; DOW, model: the BW30-400FR/34 evaporator unit 6 may be, for example, an MVR evaporator manufactured by Shanghai Korea.
The embodiment of the utility model provides an among the processing system of inorganic silica gel waste water, be equipped with sludge outlet 41 on the submergence formula ultrafiltration device 4, the system still includes sludge impoundment 8, sludge outlet 41 and sludge impoundment 8 intercommunication. The sludge tank 8 is communicated with the screw stacking machine 9 and the sludge loading truck 10 in sequence along the sludge output direction. Specifically, after the wastewater passes through the electric desiliconization device 3, agents such as a desiliconization agent and a coagulant aid are added to flocculate silicon in the wastewater, the wastewater enters an immersed ultrafiltration membrane assembly to separate flocculate from saline water, the separated flocculate (sludge) is discharged into a sludge tank 8, the sludge is pumped to a screw stacking machine 9 to be dewatered, dewatered sludge with low water content is separated, and a sludge loading truck 10 is used for pulling away the dewatered sludge for subsequent treatment.
Example 1
The silica gel production wastewater from the wastewater tank 1 is sent to a precipitation wastewater pool 2 for natural sedimentation, and the wastewater after natural sedimentation is neutralized to weak acidity by adding a small amount of alkali and then is subjected to electrolytic desiliconization treatment by an electric desiliconization device 3. After electrolytic desiliconization, a small amount of desiliconization agent is added from the desiliconization agent storage unit 12 and coagulant aid is added from the coagulant aid storage unit 13, ultrafiltration treatment is carried out by an immersed ultrafiltration membrane device, and after high-silicon scale inhibitor is added into ultrafiltration treatment water, reverse osmosis treatment is carried out by an SRO reverse osmosis device 5, so that clear water and concentrated water are obtained. And (4) sending the concentrated water to an evaporation device 6 for evaporation treatment to obtain anhydrous sodium sulfate. And (3) sending the evaporation condensation water of the evaporation device 6 and the clean water to a clean water tank 7 for recycling of the silica gel production system.
Table 1 shows the operating data of the reverse osmosis system of example 1.
TABLE 1
As shown in Table 1, the flow rates of clear water and concentrated water in the running process of the reverse osmosis membrane after electrolytic silicon removal are not obviously changed along with the time, and the pressure difference between the inlet and the outlet of the reverse osmosis membrane is not changed, so that the reverse osmosis system can still normally run after continuously running for 384 hours, and the membrane blockage phenomenon cannot be generated. The electric silicon removing device 3 adopted by the invention can achieve the purpose of removing silicon (mainly referring to soluble silicon) from the waste water generated in the production of silica gel by consuming electricity and a small amount of electrodes, the operation cost is relatively low, the cost of electricity and electrodes consumed by the electric silicon removing device is 1.4 yuan/ton of waste water, and the increased cost is within the acceptable range of enterprises. Meanwhile, the service life of the membrane is longer, so that the treatment cost of the waste water produced by the silica gel is greatly reduced.
The utility model discloses a working process:
silica gel production wastewater containing sodium sulfate generated in the silica gel production procedure enters a wastewater tank 1, then enters a precipitation wastewater tank 2 for natural sedimentation pretreatment, and the pretreated silica gel production wastewater is subjected to electrolytic desiliconization through an electric desiliconization device 3; carrying out ultrafiltration treatment on the wastewater subjected to electrolytic desiliconization through an immersed ultrafiltration membrane device to obtain ultrafiltration treated water; carrying out reverse osmosis treatment on the ultrafiltration treated water through an SRO reverse osmosis device 5 to obtain a first water body and a second water body; and (4) conveying the second water body to an evaporation device 6 for evaporation treatment to obtain anhydrous sodium sulfate.
In conclusion, through the system of the application, the soluble silicon in the silica gel production wastewater can be effectively removed, the problem of scaling and blocking of the ultrafiltration membrane and the reverse osmosis membrane is well solved, the service time of the membrane is greatly prolonged, the treatment cost is reduced, and the zero emission of the inorganic silica gel production wastewater is realized.
The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention shall be covered by the claims of the present invention.
Claims (10)
1. A treatment system for inorganic silica gel production wastewater is characterized by comprising an electric desiliconization device (3), an immersed ultrafiltration device (4), a reverse osmosis device (5) and an evaporation device (6) which are communicated with each other; the reverse osmosis device (5) is provided with a clear water outlet (51) and a concentrated water outlet (52), and is externally connected with a clear water tank (7), and the clear water tank (7) is communicated with the clear water outlet (51); the evaporation device (6) is provided with an evaporation device inlet (61) and an evaporation condensed water outlet (62); the concentrated water outlet (52) is communicated with the evaporation device inlet (61); the evaporation condensed water outlet (62) is communicated with the clear water tank (7).
2. The system for treating inorganic silica gel production wastewater as defined in claim 1, wherein the electric desiliconization apparatus (3) comprises a water inlet (31), a chamber (32) and a water outlet (33) which are in fluid communication in this order; a sewage draining outlet (34) is formed in the bottom of the cavity (32); an anode plate (35) and a cathode plate (36) are arranged in the cavity (32); the device also comprises an electrode plate anode interface (37) connected with the anode plate (35) and an electrode plate cathode interface (38) connected with the cathode plate (36).
3. The system for treating wastewater from inorganic silica gel production as claimed in claim 2, wherein the volume of the chamber (32) is 0.3m 3 ～0.4m 3 。
4. The system for treating inorganic silica gel production wastewater according to claim 2, wherein the electrolytic current of the electric desiliconization apparatus (3) is 100 to 200A.
5. The system for treating inorganic silica gel production wastewater as set forth in claim 2, wherein the electrolytic voltage of the electric desiliconization apparatus (3) is 24 to 36V.
6. The system for treating wastewater in the production of inorganic silica gel according to claim 1, further comprising a wastewater tank (1), wherein a sedimentation wastewater tank (2) is arranged between the wastewater tank (1) and the electric silica removal device (3); and an alkali liquor storage unit (11) is also arranged on a communicating pipeline of the sedimentation wastewater tank (2) and the electric desiliconization device (3).
7. The system for treating inorganic silica gel production wastewater according to claim 1, wherein a desiliconization agent storage unit (12) and a coagulant aid storage unit (13) are further arranged on a communication pipeline of the electric desiliconization device (3) and the immersed ultrafiltration device (4).
8. The system for treating inorganic silica gel production wastewater according to claim 1, wherein a high silica scale inhibitor storage unit (14) is further arranged on a communication pipeline between the submerged ultrafiltration device (4) and the reverse osmosis device (5).
9. The system for treating inorganic silica gel production wastewater according to claim 1, wherein the immersed ultrafiltration device (4) is provided with a sludge outlet (41), the system further comprises a sludge tank (8), and the sludge outlet (41) is communicated with the sludge tank (8).
10. The system for treating inorganic silica gel production wastewater according to claim 9, wherein the sludge tank (8) is communicated with the screw stacking machine (9) and the sludge loading vehicle (10) in sequence along a sludge output direction.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220841328.6U CN217578582U (en) | 2022-04-07 | 2022-04-07 | Inorganic silica gel waste water's processing system |
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| CN202220841328.6U CN217578582U (en) | 2022-04-07 | 2022-04-07 | Inorganic silica gel waste water's processing system |
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