CN112851018A - Silicon industrial park wastewater treatment process and device - Google Patents
Silicon industrial park wastewater treatment process and device Download PDFInfo
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Abstract
The invention belongs to the technical field of sewage treatment, and relates to a silicon industrial park wastewater treatment process and a silicon industrial park wastewater treatment device. To silicon industry garden among the prior art, white carbon black waste water and garden are synthesized waste water mixed treatment time salt height, biochemical difficulty, and during two kinds of waste water reposition of redundant personnel handles, ammonia nitrogen and total nitrogen are high in the garden is synthesized waste water, and the carbon-nitrogen ratio is low, and traditional denitrogenation technology treatment effect is unsatisfactory, need additionally to add the technical problem of a large amount of carbon sources. The scheme provides a silicon industrial park wastewater treatment process, a small part of wastewater bypass branch is taken out from white carbon black wastewater, sulfate in the white carbon black wastewater is converted into reduced sulfur, a sulfur source is provided for sulfur autotrophic nitrogen removal flora, and nitrogen pollution removal of the wastewater with low carbon-nitrogen ratio is realized under the condition of no carbon source addition. The scheme also provides a dissimilatory/denitrification device, which can realize the conversion of sulfur and the autotrophic denitrification reaction of sulfur in the same device, realize the high-efficiency treatment of two different types of wastewater, and has the advantages of compact rhythm, no transfer process and high reaction efficiency.
Description
Technical Field
The invention belongs to the technical field of sewage treatment in industrial parks, and particularly relates to a silicon industrial park wastewater treatment process and device.
Background
The industrial basis of the silicon industrial park is the quartz stone finish machining service, and the white carbon black is an important silicon-based raw material. White carbon black production enterprises mainly use a sulfuric acid precipitation method to prepare white carbon black, namely sodium silicate is used as a raw material, sulfuric acid is used for acidification to generate silicic acid, and then the silicic acid is decomposed to prepare precipitated silicon dioxide, and wastewater produced by the process is mainly characterized by containing SiO with higher concentration2And sulfates. Silicon industry garden sewage treatment plant except white carbon black waste water, still need to synthesize sewage to the garden and handle the waste water of two kinds of different grade types. If the white carbon black wastewater which is mainly inorganic wastewater and the comprehensive sewage which is mainly domestic wastewater in a park are mixed for treatment, the problem of high salinity biochemical treatment needs to be solved, because the mixed wastewater is mainly inorganic wastewater, and because the content of carbon source in the inorganic wastewater is less, the carbon-nitrogen ratio is extremely low, great difficulty is brought to heterotrophic denitrification treatment.
The newly-built silicon industrial park generally carries out split-flow treatment on the white carbon black wastewater and the park comprehensive wastewater, and can adopt a physical and chemical combined process of 'magnetic coagulation + reverse osmosis + MVR evaporation' to treat inorganic white carbon black wastewater. The comprehensive wastewater in the garden is treated by adopting the traditional biochemical process, but the problem of low carbon-nitrogen ratio exists, and a carbon source needs to be additionally added during treatment.
The Chinese invention patent application publication number CN103482809A, the application date is 26/08/2013, and the name is: a white carbon black production wastewater zero discharge process; discloses that the white carbon black production wastewater is firstly filtered by a ceramic membrane to obtain ceramic membrane dialysate and ceramic membrane concentrated solution; carrying out plate-and-frame filter pressing on the ceramic membrane concentrated solution, and carrying out circulating treatment in a collecting tank; performing nanofiltration on the ceramic membrane dialysate to obtain a sodium sulfate concentrated solution; the first-stage nanofiltration dialysate is subjected to first-stage reverse osmosis to obtain first-stage reverse osmosis dialysate and first-stage reverse osmosis concentrated solution, the scheme starts from the aspect of physical and chemical processes, and the product is sodium sulfate which cannot be fully utilized.
The Chinese invention patent application publication number CN108946940A, the application date is 2018, 06 and 21, and the name is: an integrated device for treating wastewater with low carbon-nitrogen ratio and an operation method thereof; the disclosed device comprises a water inlet tank, a short-cut nitrification biological filter, a heterotrophic-sulfur autotrophic denitrification biological filter, a water outlet tank, a water inlet pump, an air pump and aeration device, a water outlet pump and reflux pump, a back flush pump, a PLC (programmable logic controller) and related control valves, wherein the operation method of the integrated device comprises the following steps: s1: adding filler according to a high proportion, and carrying out sludge inoculation treatment: s2: carrying out short-cut nitrification treatment; s3: nitrite nitrogen is subjected to denitrification process under heterotrophic and autotrophic conditions; s4: in the backwashing position, the scheme uses an external sulfur source to replace an external carbon source, and needs an external sulfur source, so that the method is uneconomical.
Disclosure of Invention
1. Technical problem to be solved by the invention
To silicon industry garden among the prior art, white carbon black waste water and garden are synthesized waste water mixed treatment time salt height, biochemical difficulty, and when the waste water single treatment is synthesized in the garden, ammonia nitrogen and total nitrogen are high in the waste water is synthesized in the garden, and the carbon nitrogen ratio is low, and traditional denitrogenation technology treatment effect is unsatisfactory, needs additionally to add the technical problem of a large amount of carbon sources. The scheme provides a silicon industrial park waste water treatment process, by taking out the bypass branch of a small part of waste water in the white carbon black waste water, utilizes the sulfate in the white carbon black waste water in the silicon industrial park, provides a sulfur source for the sulfur autotrophic denitrification flora by converting into reduced sulfur, and realizes the high-efficient removal of nitrogen pollution of the waste water with low carbon-nitrogen ratio under the condition of no carbon source addition. The scheme also provides a dissimilatory/denitrification device, which can realize the conversion from sulfate to sulfur and the implementation of sulfur autotrophic denitrification reaction in the same device, realizes the high-efficiency treatment of two different types of wastewater, and has the advantages of compact rhythm, no transfer process and high-efficiency and complete reaction.
2. Technical scheme
In order to achieve the purpose, the technical scheme is as follows:
the silicon industrial park wastewater treatment process comprises a park comprehensive wastewater treatment process and a white carbon black wastewater treatment process, wherein the white carbon black wastewater treatment process comprises a sulfate dissimilation step by using sulfate reducing bacteria, the park comprehensive wastewater treatment process comprises a sulfur autotrophic denitrification step for using sulfur generated by sulfate dissimilation for denitrification, and the sulfate dissimilation step and the sulfur autotrophic denitrification step are carried out in a dissimilation/denitrification device.
Further, the white carbon black wastewater treatment process comprises two flow paths, wastewater of the first flow path enters a sulfate dissimilatory step for treatment, and wastewater of the second flow path comprises the following steps of sequentially treating: coagulation, sand rate, reverse osmosis and MVR evaporation to produce a byproduct sodium sulfate; and/or the comprehensive wastewater of the park is also subjected to aerobic treatment before the sulfur autotrophic denitrification reaction.
Furthermore, the comprehensive wastewater treatment process of the garden also comprises aerobic treatment before the step of sulfur autotrophic denitrification and advanced treatment after the step of sulfur autotrophic denitrification.
Further, the white carbon black wastewater is filtered after sulfate isomerization, the filtered reduced sulfur enters the step of sulfur autotrophic denitrification treatment of the park comprehensive wastewater, and the intercepted sulfate enters the step of reverse osmosis of the first flow path after sand filtration and nanofiltration treatment.
A dissimilatory/denitrification device is used for implementing the silicon industrial park wastewater treatment process, and comprises a device body with an inner cavity, wherein a nitrogen adsorption module is arranged at the upper part of the inner cavity of the device body, and is loaded with nitrogen adsorption filler and used for carrying out sulfur autotrophic denitrification reaction; a sulfur adsorption module is arranged at the lower part of the inner cavity of the device body, and is loaded with sulfur adsorption filler and used for carrying out the dissimilation reaction; the nitrogen adsorption module is connected to the device body through a movable connecting piece and can move relative to the sulfur adsorption module to be far away from or embedded with each other;
the top of the device body is provided with a garden comprehensive wastewater inlet; a second water outlet pipeline is arranged at the upper part of the side wall of the device body, and a white carbon black wastewater inlet is arranged at the lower part of the side wall of the device body; the bottom of the device body is provided with a first water outlet pipeline.
Further, the nitrogen adsorption module comprises a first tabling mechanism and the sulfur adsorption module comprises a second tabling mechanism; the first fitting means and the second fitting means can be fitted to each other.
Further, the first embedding mechanism is connected to the water distribution plate; a water distribution cavity is arranged between the comprehensive wastewater inlet of the park and the water distribution plate, and a pore structure is arranged on the water distribution plate and is obliquely arranged.
Furthermore, a threaded rod extending downwards is arranged on the top wall of the device body, and a threaded ring matched with the threaded rod is arranged on the threaded rod; the threaded ring is connected to the side wall of the nitrogen adsorption module; the threaded rod rotates to drive the threaded ring to rotate, so that the nitrogen adsorption module is driven to move up and down in the device body.
Furthermore, the bottom of the device body is conical, and a mounting seat is arranged on the inner wall of the conical bottom of the device body; the sulfur adsorption module is erected on the mounting seat; a bottom plate of the sulfur adsorption module and the bottom of the conical device body form a sludge collection cavity; the bottom plate of the sulfur adsorption module is provided with a hole.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:
(1) according to the sulfur autotrophic nitrogen removal process, sulfate dissimilation in partial white carbon black wastewater is converted into reduced sulfur through sulfate reducing bacteria, the reduced sulfur is used for sulfur autotrophic denitrification reaction of the park comprehensive wastewater, the characteristics of the silicon industrial park wastewater are utilized, the problem that the carbon-nitrogen ratio in the park comprehensive wastewater is low during shunting treatment of the silicon industrial park comprehensive wastewater in the prior art is solved, no additional carbon source is needed, namely, a small part of wastewater bypass is taken out from the white carbon black wastewater, sulfate in the white carbon black wastewater in the silicon industrial park is utilized and converted into reduced sulfur to provide a sulfur source for sulfur autotrophic nitrogen removal flora, and the high-efficiency removal of pollution caused by the low carbon-nitrogen ratio wastewater is realized under the condition of no carbon source addition.
(2) According to the sulfur autotrophic nitrogen removal process, inorganic white carbon black wastewater is treated by adopting a physicochemical combined process of magnetic coagulation, reverse osmosis and MVR evaporation, and the purity of an evaporation product sodium sulfate is obviously superior to that of a mixed wastewater crystallization product; the comprehensive wastewater in the park is treated by adopting a biochemical combined process of 'aerobic and anoxic (sulfur autotrophic denitrification reaction)', and the process can effectively degrade organic matters and nutrient substances in the wastewater. The separation of sulfate and reduced sulfur is realized after filtration, the filtered reduced sulfur enters the step of the comprehensive wastewater sulfur autotrophic denitrification treatment in the park, the intercepted sulfate enters the step of the reverse osmosis in the first flow path after sand filtration and nanofiltration treatment, the high-concentration sulfate cannot enter the comprehensive wastewater treatment section in the park from the main path and the bypass path, the normal operation of a biochemical system is ensured, the reduced sulfur can be used as an electron donor to carry out sulfur autotrophic denitrification enhancement reaction, and the carbon source of the white carbon black wastewater is indirectly utilized to solve the problem of denitrification of domestic sewage.
(3) According to the denitrification device, the nitrogen adsorption module and the sulfur adsorption module are arranged in the inner cavity of the device body simultaneously, so that the dissimilation reaction and the sulfur autotrophic denitrification reaction are carried out in the same denitrification device in a sequencing batch manner, the occupied area is small, two different biochemical reactions of anaerobic reduction state sulfur and anoxic denitrification can be combined more effectively, the sulfur produced by sulfate and the dissimilation reaction is utilized to carry out denitrification treatment on the wastewater containing organic matters, namely the garden comprehensive wastewater, the wastewater is carried out in a sequencing batch manner, the nitrogen adsorption module can be arranged on the upper part of the device body in the anaerobic reaction stage, high-concentration inorganic wastewater cannot contact with the nitrogen adsorption module, the microbial activity filled in the filler of the nitrogen adsorption module cannot be caused, the high-efficiency treatment of two different types of wastewater is realized, the rhythm is compact, the transfer process does not exist, and the reaction is efficient and complete.
Drawings
FIG. 1 is a schematic view of a dissimilatory/denitrogenation apparatus from a first perspective;
FIG. 2 is a schematic view of a dissimilatory/denitrogenation apparatus from a second perspective;
FIG. 3 is a schematic view of a dissimilatory/denitrogenation apparatus from a third perspective;
FIG. 4 is a schematic sectional view of a dissimilatory/denitrogenation apparatus from the front;
FIG. 5 is a schematic top view of a dissimilatory/denitrogenation apparatus;
FIG. 6 is a schematic view of a process flow for treating wastewater from a silicon industrial park.
In the figure:
1. a nitrogen adsorption module; 2. a sulfur adsorption module; 3. a threaded ring; 4. a threaded rod; 5. a second water outlet pipeline; 6. a flow impeller; 7. a white carbon black wastewater inlet; 8. a first water outlet pipeline; 9. a first fitting mechanism; 10. a slot structure; 11. a comprehensive waste water inlet of the park; 12. a motor; 13. a second fitting mechanism; 14. a sludge discharge pipeline; 15. a baffle plate; 16. a water distribution plate; 17. a pore structure; 18. a water distribution cavity; 19. a mounting seat; 20. a sludge collecting cavity.
Detailed Description
The invention is further described with reference to specific examples.
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to fig. 1 to 6, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments; all other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
In the wastewater treatment process of the silicon industrial park of the embodiment, as shown in fig. 6, the process includes a park comprehensive wastewater treatment process and a white carbon black wastewater treatment process.
The white carbon black wastewater treatment process comprises two flow paths, wherein the wastewater of the first flow path enters a sulfate dissimilatory step for treatment, sulfate in the wastewater is converted into reduced sulfur through sulfate reducing bacteria, the reduced sulfur is used for a comprehensive wastewater treatment process in a garden after filtration, and the unconverted sulfate enters the second flow path; the second flow path wastewater treatment process comprises the following steps of: coagulation, sand rate, reverse osmosis and MVR evaporation, producing sodium sulfate as a by-product. The first flow path returns the filtered sulfate to the reverse osmosis step. The by-product sodium sulfate is recovered in a solid mode after being precipitated, and the wastewater is discharged after reaching the standard.
The process for treating the comprehensive wastewater in the garden comprises aerobic treatment before the step of sulfur autotrophic denitrification and advanced treatment after the step of sulfur autotrophic denitrification. The sulphur of the sulphur autotrophic denitrification step for denitrification originates from sulphate dissimilation of the first flow path. After aerobic treatment, organic matters in the wastewater are reduced, the carbon-nitrogen ratio is reduced, a carbon source needs to be added for bringing difficulties for subsequent denitrification treatment, and in the scheme, reduced sulfur obtained in the first flow path is used for sulfur autotrophic denitrification and final denitrification, so that the wastewater reaches the discharge standard.
The sulfate dissimilatory step and the sulfur autotrophic denitrification step are carried out in a dissimilatory/denitrogenation unit. The sulfate dissimilation step and the sulfur autotrophic denitrification step are carried out in the same device, so that the high-efficiency treatment of two different types of wastewater can be realized, the rhythm is compact, the transfer process is avoided, and the reaction is high-efficiency and complete. However, attention needs to be paid to the time control of the device structure or the two steps, so that the reduction of the activity of the denitrifying flora caused by high salt in the white carbon black wastewater is avoided.
Example 2
The dissimilatory/denitrification device used in example 1, as shown in fig. 1-5, has a cylindrical body and a conical bottom, and the conical bottom facilitates the collection and discharge of sludge. The top of the device body is provided with a garden comprehensive waste water inlet 11 and a motor 12.
Conical device body bottom is equipped with mount pad 19, and sulfur adsorption module 2 erects on mount pad 19, the dismouting of being convenient for to clean and maintain the device body is inside. The bottom plate of the sulfur adsorption module 2 and the bottom of the conical device body form a sludge collection cavity 20, the bottom plate of the sulfur adsorption module 2 is provided with holes, and the bottom plate of the sulfur adsorption module 2 can also be a plate-shaped sand filter structure. The sulfur adsorption module 2 includes a second fitting mechanism 13, and the second fitting mechanism 13 is loaded with a sulfur adsorption packing.
Device body inner chamber upper portion is equipped with nitrogen adsorption module 1, nitrogen adsorption module 1 contains first gomphosis mechanism 9, be equipped with the groove structure 10 that the slope set up on the first gomphosis mechanism 9, through the slope or the curved surface shape setting of groove structure 10, increase reaction area. The first embedding mechanism 9 is connected to the water distribution plate 16, the water distribution plate 16 is provided with a hole structure 17, and the hole structure 17 inclines towards the groove structure 10. Waste water import 11 is synthesized in garden and water distribution plate 16 forms water distribution chamber 18, and waste water is synthesized by garden and is got into water distribution chamber 18 by waste water import 11 is synthesized in garden, forms the waste water of a take the altitude in water distribution chamber 18, and is even by pore structure 17 flow to groove structure 10, so design, the area of contact on waste water is synthesized in garden and the first gomphosis mechanism 9 is bigger, and reaction time is longer, and the high-efficient abundant reaction of filler ability. The edge of the water distribution plate 16 extends outwards and downwards to form a certain angle, and a baffle 15 is formed. The first embedding mechanisms 9 and the second embedding mechanisms 13 are arranged in a staggered mode, when the nitrogen adsorption module 1 moves downwards to the sulfur adsorption module 2, the first embedding mechanisms 9 and the second embedding mechanisms 13 are embedded with each other, and the first embedding mechanisms 9 and the second embedding mechanisms 13 can be of a concentric circle structure, a mosquito-repellent incense structure, a rectangular structure and the like. A threaded rod 4 which extends downwards is arranged on the top wall of the device body and is provided with a threaded ring 3 matched with the threaded rod. The threaded ring 3 is connected to the side wall of the nitrogen adsorption module 1. Be equipped with motor 12 on the outer wall of device body top, motor 12 is connected the top of threaded rod 4 starts motor 12, and threaded rod 4 is rotatory to drive threaded ring 3 and rotates to drive nitrogen adsorption module 1 reciprocates in the device body.
The bottom of the device body is provided with a first water outlet pipeline 8 and a sludge discharge pipeline 14, and the sludge discharge pipeline 14 is divided into two pipelines which respectively extend to dead corners of a sludge collection cavity and a mounting seat 19, so that sludge can be conveniently removed. The upper part of the side wall of the device body is provided with a second water outlet pipeline 5 for continuously discharging water after the sulfur autotrophic denitrification reaction, and the reaction time of the sewage is prolonged by the upward and upward discharge. The lower part of the side wall is provided with a flow impeller 6 and a white carbon black wastewater inlet 7. The flow driver 6 is used for stirring during the reaction. White carbon black waste water import 7 adopts and sprays the structure, white carbon black waste water import 7 is a plurality of. The spray holes of the spray header of the white carbon black wastewater inlet 7 are sparse from top to bottom, the sparse hole water flow is relatively sharp and thick and is used for spraying to the center of the second embedding mechanism 13, and the dense hole water is relatively dense and thin and is used for spraying to the edge and the periphery of the second embedding mechanism 13, so that the maximum contact area of the filler loaded by the second embedding mechanism 13 is reacted with the wastewater.
Example 3
The operation of the apparatus described in example 2 was as follows:
the device runs in a periodic sequence batch mode, and when one running period starts, no waste water is left in the device body. After the reaction starts, the effluent of the anaerobic reactor enters the device body from a white carbon black wastewater inlet 7, the wastewater contains more sulfides, and is leached to the sulfur adsorption module 2 in a spraying mode, and the filler loaded by the second embedding mechanism 13 is a mixed filler of iron oxide and clinoptilolite mainly containing iron oxide. The wastewater passes through the sulfur adsorption module 2, is filtered by sand at the bottom of the device body and then enters the nanofiltration device. The non-adsorbed sulfide can realize the separation of sulfate and sulfide through a nanofiltration mode, thereby not only preventing high-concentration sulfate from entering a biochemical system, but also providing a sulfur source electron donor for an anoxic tank to promote the sulfur autotrophic nitrogen removal strengthening reaction. In the first reaction stage, the height of the white carbon black wastewater is the lowest height of the highest point of a water line in the device body without contacting the nitrogen adsorption module 1.
And after adsorption tends to be saturated, the wastewater enters a second reaction stage, in the second reaction stage, the wastewater in the anoxic pond enters the device body through the park comprehensive wastewater inlet 11, and the wastewater firstly passes through the nitrogen adsorption module 1 after entering the device body, and the filler loaded by the first embedding mechanism 9 in the nitrogen adsorption module 1 is clinoptilolite and can adsorb nitrate in the wastewater. When the wastewater flows through the first embedding mechanism 9 from top to bottom, the groove structure 10 and the baffle plate 15 on the wastewater increase the contact area between the wastewater and the filler and prolong the contact time between the wastewater and the filler, so that the adsorption of the nitrate is more complete. After the comprehensive wastewater in the park of the device body is full of wastewater, the threaded rod 4 is driven by the motor 12 to rotate to drive the threaded ring 3 to rotate so as to move the nitrogen adsorption module 1 downwards. After the first embedding mechanism 9 on the nitrogen adsorption module 1 and the second embedding mechanism 13 on the sulfur adsorption module 2 are embedded with each other, a microbial film and a nitrogen source exist on the first embedding mechanism 9, a sulfur source exists in the second embedding mechanism 13, the sulfur autotrophic reaction occurs, and the baffle 15 prolongs the path of water flow, so that the reaction is more sufficient. The stage is continuous water inlet and outlet, and the advanced treatment stage is directly carried out from the second water outlet pipeline 5. The first reaction stage and the second reaction stage, and the flow pushing device 6 arranged on the side wall of the device body provides a stirring effect for the reaction. And after the treatment parameters reach the standard, entering a third reaction stage, wherein the device body does not feed water any more, the treated wastewater is discharged through the first water outlet pipeline 8, and after the wastewater is discharged, the nitrogen adsorption module 1 is lifted to the upper part of the device through the power device to start the next reaction period. After several reaction cycles, the accumulated sludge is discharged out of the apparatus body through the sludge discharge line 14. The device body uses nitrogen adsorption module 1 as the microorganism biofilm formation region, can avoid the influence of high concentration sulphate waste water to microorganism on it after nitrogen adsorption module 1 promotes.
Example 4
The height of the device body is 5m, the diameter of the cylinder is 2m, the heights of the nitrogen adsorption module 1 and the sulfur adsorption module 2 are 2m, and DO is controlled to be less than 0.3 mg/L.
The operation steps are as follows:
in the first stage, the sulfide content in the sulfur-containing wastewater is about 25-30 mg/L, and after the sulfur-containing wastewater is adsorbed by iron oxide and clinoptilolite (the weight ratio is 8:2) (the particle size is 3-6 mm, and the porosity is about 60%), the sulfide concentration in the discharged water is about 2-3 mg/L (the discharged water returns to an anoxic tank for continuous action) for 30 min.
And in the second stage, the park comprehensive sewage is fed, the total nitrogen is 15-20 mg/L, the COD is about 40mg/L, the low carbon nitrogen ratio is achieved, and the clinoptilolite and high polymer water absorption material (8:2) mixed filler (the particle size is 3-6 mm, the porosity is about 60%) absorbs nitrogen.
(1) The initial adsorption time is about 10min (water is filled), then the nitrogen adsorption module 1 moves downwards to be embedded with the sulfur adsorption module 2, the nitrogen adsorption module 1 moves downwards for 40min, the COD of the effluent at the moment is about 20mg/L, and the total nitrogen is about 5-10 mg/L;
(2) the initial adsorption time is about 20min (water is filled), then the nitrogen adsorption module 1 moves downwards to be embedded with the sulfur adsorption module 2, the nitrogen module moves downwards for 40min, the COD of the effluent is about 10mg/L, and the total nitrogen is about 1-3 mg/L;
(3) the initial adsorption time is about 30min (water is filled), then the nitrogen adsorption module 1 moves downwards to be embedded with the sulfur adsorption module 2, the nitrogen module moves downwards for 40min, the COD of the effluent at the moment is about 10mg/L, and the total nitrogen is about 1-3 mg/L.
Therefore, adsorption is performed for 20 min.
(4) The initial adsorption time is about 20min (water is filled), then the nitrogen adsorption module 1 moves downwards to be embedded with the sulfur adsorption module 2, the nitrogen adsorption module 1 moves downwards for 20min, the COD of the effluent at the moment is about 20mg/L, and the total nitrogen is about 5-10 mg/L;
(5) the initial adsorption time is about 20min (water is filled), then the nitrogen adsorption module 1 moves downwards to be embedded with the sulfur adsorption module 2, the nitrogen adsorption module 1 moves downwards for 40min, the COD of the effluent at the moment is about 10mg/L, and the total nitrogen is about 1-3 mg/L;
(6) the initial adsorption time is about 20min (water is filled), then the nitrogen adsorption module 1 moves downwards to be embedded with the sulfur adsorption module 2, the nitrogen adsorption module 1 moves downwards to react for 60min, the COD of the effluent at the moment is about 8mg/L, and the total nitrogen is about 1-3 mg/L.
Therefore, the reaction time is selected to be 40 min.
Example 5
The device of example 2 has a height of 5m, a cylinder diameter of 2m, a height of 2m for the nitrogen adsorption module 1 and the sulfur adsorption module 2, no aeration, and DO less than 0.3 mg/L.
The operation steps are as follows:
in the first stage, the sulfide content in the sulfur-containing wastewater is about 25-30 mg/L, and after the sulfur-containing wastewater is adsorbed by iron oxide and clinoptilolite (8:2) mixed filler (the particle size is 3-6 mm, the porosity is about 60%), the sulfide concentration in the discharged water is about 2-3 mg/L (the discharged water is continuously acted by returning to a device body), and the adsorption time is 30 min.
And in the second stage, the device body synthesizes sewage and water, the total nitrogen is 15-20 mg/L, the COD is about 40mg/L, the low carbon nitrogen ratio is achieved, and clinoptilolite, iron oxide filler and high molecular water absorption material (8:1:1) are mixed with filler (the particle size is 3-6 mm, and the porosity is about 60%). Adsorbing nitrogen, wherein the initial adsorption time is about 20min (water is filled), then the nitrogen adsorption module 1 moves downwards to be embedded with the sulfur adsorption module 2, water is continuously fed at the moment, the HRT is kept for 1h, the nitrogen adsorption module 1 moves upwards again after moving downwards for 40min, and the adsorption is kept for 20 min; moving down to react for 40min, and repeating the above steps for 3 times, stopping water inflow and draining. The water treated in the continuous water inlet stage is discharged from the second water outlet pipeline 5, and the water treated in the water discharge stage is discharged from the first water outlet pipeline 8 to the advanced treatment process. The COD of the effluent is less than 10mg/L, and the total nitrogen is about 1-3 mg/L.
In the third stage, the nitrogen adsorption module 1 moves upwards, and the sulfur-containing wastewater inlet program is started to enter the next stage.
The device has low sludge production, sludge can be discharged once in 5 times of circulation, and the sludge is discharged through the sludge discharge pipeline 14.
Example 6
The height of the device body is 5m, the diameter of the cylinder is 2m, the heights of the nitrogen adsorption module 1 and the sulfur adsorption module 2 are 2m, the device is not aerated, and DO is controlled to be less than 0.3 mg/L;
the operation steps are as follows:
in the first stage, the sulfide content in the sulfur-containing wastewater is about 25-30 mg/L, and after the sulfur-containing wastewater is adsorbed by iron oxide mixed filler (the particle size is 3-6 mm, the porosity is about 60%), the sulfide concentration in the discharged water is about 2-3 mg/L (the discharged water returns to the device body to continue acting) for 30 min.
The second stage, feeding water into the comprehensive wastewater in the park, wherein the total nitrogen is 15-20 mg/L, the COD is about 40mg/L, the low carbon nitrogen ratio is achieved, clinoptilolite and a high molecular water absorption material (8:2) are mixed with fillers (the particle size is 3-6 mm, the porosity is about 60%), nitrogen is absorbed, the initial absorption time is about 20min (the water is filled), then the nitrogen absorption module 1 is moved downwards to be embedded with the sulfur absorption module 2, water is continuously fed at the moment, the HRT is kept for 1h, the nitrogen absorption module 1 is moved upwards again after being moved downwards for 40min, and the absorption is kept for 20 min; and (4) moving the nitrogen adsorption module 1 downwards for reaction for 40min, and stopping water inflow and draining after the cycle is cycled for 3 times. The water treated in the continuous water inlet stage is discharged from the second water outlet pipeline 5, and the water treated in the water discharge stage is discharged from the lower part to the advanced treatment process. The COD of the effluent is about 20mg/L, and the total nitrogen is about 5-10 mg/L.
And in the third stage, the nitrogen adsorption module 1 is moved upwards, and the sulfur-containing wastewater inlet procedure is started to enter the next stage.
The device has low mud production, and can discharge mud once per 5 times of circulation.
The addition of ferrite chemistry in the nitrogen adsorption module and the addition of clinoptilolite in the sulfur adsorption module are more favorable for the distribution of a sulfur source nitrogen source, and further favorable for the occurrence of sulfur autotrophic nitrogen removal reaction.
Claims (9)
1. A silicon industrial park wastewater treatment process is characterized in that: the process comprises a park comprehensive wastewater treatment process and a white carbon black wastewater treatment process, wherein the white carbon black wastewater treatment process comprises a sulfate dissimilation step by using sulfate reducing bacteria, the park comprehensive wastewater treatment process comprises a sulfur autotrophic denitrification step for using sulfur generated by sulfate dissimilation for denitrification, and the sulfate dissimilation step and the sulfur autotrophic denitrification step are carried out in a dissimilation/denitrification device.
2. The silicon industrial park wastewater treatment process of claim 1, characterized in that: the white carbon black wastewater treatment process comprises two flow paths, the wastewater of the first flow path enters a sulfate dissimilatory step for treatment, and the wastewater treatment process of the second flow path comprises the following steps of sequentially treating: coagulation, sand rate, reverse osmosis and MVR evaporation to produce a byproduct sodium sulfate; and/or the comprehensive wastewater of the park is also subjected to aerobic treatment before the sulfur autotrophic denitrification reaction.
3. The silicon industrial park wastewater treatment process of claim 2, characterized in that: the process for treating the comprehensive wastewater in the garden also comprises aerobic treatment before the step of sulfur autotrophic denitrification and advanced treatment after the step of sulfur autotrophic denitrification.
4. The silicon industrial park wastewater treatment process of claim 3, characterized in that: and filtering the white carbon black wastewater after sulfate dissimilatory transformation, allowing the filtered reduced sulfur to enter the step of sulfur autotrophic denitrification treatment of the comprehensive wastewater in the park, and allowing the intercepted sulfate to enter the step of reverse osmosis of the first flow path after sand filtration and nanofiltration treatment.
5. A dissimilatory/denitrogenation apparatus for carrying out a silicon industrial park wastewater treatment process according to any one of claims 1 to 4, characterized in that:
the device comprises a device body with an inner cavity, wherein a nitrogen adsorption module (1) is arranged at the upper part of the inner cavity of the device body, and the nitrogen adsorption module (1) is loaded with nitrogen adsorption filler and is used for carrying out sulfur autotrophic denitrification reaction; a sulfur adsorption module (2) is arranged at the lower part of the inner cavity of the device body, and sulfur adsorption filler is loaded on the sulfur adsorption module (2) and is used for carrying out the dissimilation reaction; the nitrogen adsorption module (1) is connected to the device body through a movable connecting piece and can move relative to the sulfur adsorption module (2) to be far away from or embedded with each other;
the top of the device body is provided with a garden comprehensive wastewater inlet (11); a second water outlet pipeline (5) is arranged at the upper part of the side wall of the device body, and a white carbon black wastewater inlet (7) is arranged at the lower part of the side wall of the device body; the bottom of the device body is provided with a first water outlet pipeline (8).
6. The dissimilatory/denitrogenation apparatus according to claim 5, wherein: the nitrogen adsorption module (1) comprises a first embedding mechanism (9), and the sulfur adsorption module (2) comprises a second embedding mechanism (13); the first embedding mechanism (9) and the second embedding mechanism (13) can be embedded with each other.
7. The dissimilatory/denitrogenation apparatus according to claim 6, wherein: the first embedding mechanism (9) is connected to the water distribution plate (16); a water distribution cavity (18) is arranged between the comprehensive wastewater inlet (11) and the water distribution plate (16) in the garden, a pore structure (17) is arranged on the water distribution plate (16), and the pore structure (17) is obliquely arranged.
8. The dissimilatory/denitrogenation apparatus according to claim 7, wherein: a threaded rod (4) extending downwards is arranged on the top wall of the device body, and a threaded ring (3) matched with the threaded rod (4) is arranged on the threaded rod (4); the threaded ring (3) is connected to the side wall of the nitrogen adsorption module (1); the threaded rod (4) rotates to drive the threaded ring (3) to rotate, so that the nitrogen adsorption module (1) is driven to move up and down in the device body.
9. The dissimilatory/denitrogenation apparatus according to claim 8, wherein: the bottom of the device body is conical, and a mounting seat (19) is arranged on the inner wall of the conical bottom of the device body; the sulfur adsorption module (2) is erected on the mounting seat (19); a bottom plate of the sulfur adsorption module (2) and the bottom of the conical device body form a sludge collection cavity (20); the bottom plate of the sulfur adsorption module (2) is provided with a hole.
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| CN115385522A (en) * | 2022-08-19 | 2022-11-25 | 浙江巨能环境工程有限公司 | Comprehensive treatment method for circulating cooling water in chemical industrial park |
| CN117142609A (en) * | 2023-10-23 | 2023-12-01 | 山东辛化硅胶有限公司 | Inorganic silica gel production wastewater treatment equipment |
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