2-alkylanthraquinone production sewage treatment device

Abstract

The utility model discloses a 2-alkylanthraquinone production sewage treatment device, which is characterized in that at least three Fenton reaction tanks are communicated with a sewage collecting tank, a ferrous liquid storage tank, an oxidation residual liquid storage tank and a chelating phosphorus accumulating agent storage tank, output pipes of the Fenton reaction tanks are respectively communicated with a Fenton post-discharge pipe through independent on-off valves, a material stirring grid of a coagulating tank is communicated with the Fenton post-discharge pipe, and the Fenton post-discharge pipe is communicated with a sewage collecting tank. The mixing grid is communicated with a flocculating agent storage tank, overflow ports of the plurality of coagulating tanks are respectively communicated with a post-sedimentation discharge pipe through independent on-off valves, the plurality of biochemical tanks are connected in series through a third overflow guide pipe, the first biochemical tank is communicated with the post-sedimentation discharge pipe, and the first biochemical tank is used for receiving liquid dung. The oxidation raffinate is fully utilized, phosphoric acid in the oxidation raffinate is effectively reduced, and the discharge quality is improved; the chelated phosphorus removal agent can efficiently remove phosphorus, and ensures that the Fenton reaction is continuous and efficient.

Description

TECHNICAL FIELD

[0001] The utility model relates to anthraquinone production sewage's processing especially relates to a 2 - alkyl anthraquinone production sewage treatment device. BACKGROUND

[0002] In the hydrogen peroxide production process, the oxidation residual liquid (residual H2O2 liquid) generated in the oxidation reaction process can be used for the Fenton reaction of anthraquinone production sewage, that is, the residual H2O2 is used as an oxidizing agent for the Fenton reaction to fully utilize resources for anthraquinone production sewage treatment.

[0003] However, it is found that the oxidation residual liquid contains a certain amount of phosphoric acid (i.e. phosphate PO4 3+ The total phosphorus content of the treated sewage (wastewater total phosphorus content) is high, that is, it does not meet the discharge standard requirements. INVENTION CONTENTS

[0004] The utility model aims at solving one of the above-mentioned technical problems, providing a 2-alkyl anthraquinone production sewage treatment device, phosphorus removal treatment, and treated sewage meeting the qualified discharge standard.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the technical scheme that:

[0006] A 2-alkyl anthraquinone production sewage treatment device, comprising at least three Fenton reaction tanks, a plurality of coagulation tanks, and a plurality of biochemical tanks, the Fenton reaction tank is adapted to communicate with the sewage collection tank, the ferrous liquid storage tank, the oxidation residual liquid storage tank and the phosphorus removal agent storage tank, the output pipe of the at least three Fenton reaction tanks is respectively connected to the Fenton post-discharge pipe through a separate on-off valve, the mixing grid of the coagulation tank is connected to the Fenton post-discharge pipe through a separate on-off valve, the mixing grid is connected to the flocculant storage tank, the overflow port of the plurality of coagulation tanks is respectively connected to the post-settling discharge pipe through a separate on-off valve, and the plurality of biochemical tanks are connected in series through a third overflow guide pipe, the first biochemical tank is connected to the post-settling discharge pipe, and the first biochemical tank is adapted to receive fecal water.

[0007] Compared with the prior art, the application has the following advantages:

[0008] As an improvement of the above-mentioned technical scheme, the phosphorus removal agent storage tank is a chelating polyphosphorus agent storage tank.

[0009] As an improvement of the above-mentioned technical scheme, the Fenton reaction tank is inserted with a gas blowing pipe adapted to communicate with a Roots blower, and the Roots blower is adapted to gas stir the liquid in the Fenton reaction tank.

[0010] As an improvement of the above-mentioned technical scheme, the Fenton reaction tank is provided with a pH meter, and the Fenton reaction tank is connected to an alkali tank.

[0011] As an improvement to the above technical solution, it also includes multiple filter tanks connected in series via a fourth overflow conduit, wherein the biological treatment tank is adapted to discharge the biologically treated wastewater to the first filter tank.

[0012] As an improvement to the above technical solution, it also includes multiple oil separators connected in series via a first overflow conduit. The first overflow conduit is a bend, with its input end extending to the lower part of the cavity of the corresponding oil separator and its output end extending to the upper part of the cavity of the corresponding oil separator. The first oil separator is suitable for receiving anthraquinone production wastewater, and the last oil separator is suitable for overflowing the de-oiled wastewater into a wastewater collection tank. The Fenton reaction tank is suitable for receiving the wastewater from the wastewater collection tank.

[0013] As an improvement to the above technical solution, an emergency pool is also included. The sewage collection pool is adapted to overflow sewage into the emergency pool through a second overflow pipe. At least two pumps are connected in parallel between the sewage collection pool and the Fenton reaction tank. The sewage collection pool is equipped with a level gauge. At least one of the pumps is adapted to start and stop when the level gauge feeds back a low or high water level.

[0014] As an improvement to the above technical solution, the coagulation tank includes a mixing turbulent flow zone and a horizontal flow overflow zone. The horizontal flow overflow zone is provided with a horizontal flow pool with a volume larger than that of the mixing turbulent flow zone. A turbulent flow grid is provided at the bottom of the mixing turbulent flow zone, and a mixing grid, a dispersion grid, and a transition grid are arranged sequentially at the top of the mixing grid in a manner flush with one end of the horizontal flow pool. Part of the inner bottom of the mixing grid is adapted to receive and mix the Fenton wastewater and flocculant. Part of the inner bottom of the mixing grid is adapted to allow the turbulent flow grid to draw in the flocculated wastewater. The dispersion grid is adapted to connect with the turbulent flow grid through the transition grid. The dispersion grid is adapted to overflow the flocculated wastewater into the horizontal flow pool. An overflow channel is provided at the other end of the horizontal flow pool.

[0015] As an improvement to the above technical solution, the horizontal flow pool has multiple grooves arranged side by side from one end to the other, and the bottom of the grooves has multiple filament discharge holes arranged axially.

[0016] As an improvement to the above technical solution, an aeration pipe is inserted into the biochemical tank, and the aeration pipe is connected to an aeration fan. Attached Figure Description

[0017] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, wherein:

[0018] Figure 1 This is a schematic diagram of the wastewater treatment device for alkylanthraquinone production, as shown in Embodiment 2 of this utility model. Figure One ;

[0019] Figure 2 This is a schematic diagram of the wastewater treatment device for alkylanthraquinone production, as shown in Embodiment 2 of this utility model. Figure TwoSuitable for guiding wastewater after oil removal to the Fenton reaction tank;

[0020] Figure 3 for Figure 1 A partial structural schematic diagram of a wastewater treatment unit for 2-alkylanthraquinone production is shown.

[0021] Figure 4 for Figure 1 A three-dimensional cross-sectional view of the coagulation tank of a wastewater treatment plant for 2-alkylanthraquinone production is shown.

[0022] The accompanying drawings are only one specific embodiment of this utility model, and the form and structure of this specific embodiment should not limit the extension of other embodiments.

[0023] Grease trap 110, first overflow pipe 111, sewage collection tank 120, second overflow pipe 121, emergency tank 130

[0024] Fenton reaction tank 200,

[0025] Coagulation tank 300, mixing grid 310, turbulence grid 320, transition grid 330, dispersion grid 340, horizontal flow tank 350, ditch 351, flocculation discharge hole 352, overflow channel 360.

[0026] Biological tank 400, third overflow conduit 410,

[0027] Filter bed 500, fourth overflow pipe 510, Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] Reference Figure 1 , Figure 2This utility model provides a wastewater treatment device for the production of 2-alkylanthraquinone, including at least three Fenton reaction tanks 200, multiple coagulation tanks 300, and multiple biological treatment tanks 400. The Fenton reaction tanks 200 are adapted to be connected to a wastewater collection tank 120, a ferrous liquid storage tank, an oxidation residue storage tank, and a phosphorus removal agent storage tank. The output pipes of the at least three Fenton reaction tanks 200 are respectively connected to the Fenton post-discharge pipe through separate on / off valves. The mixing grid 310 of the coagulation tank 300 is connected to the Fenton post-discharge pipe through a separate on / off valve. The mixing grid 310 is connected to the flocculant storage tank. The overflow ports of the multiple coagulation tanks 300 are respectively connected to the sedimentation post-discharge pipe through separate on / off valves. The multiple biological treatment tanks 400 are connected in series through a third overflow conduit 410. The first biological treatment tank 400 is connected to the sedimentation post-discharge pipe and is adapted to receive sewage.

[0030] Reference Figure 3 The wastewater from anthraquinone production contains the anthraquinone organic matter to be treated (i.e., residual anthraquinone and its byproducts, all of which are recalcitrant high-molecular-weight organic compounds). Fuming sulfuric acid is used as a catalyst in anthraquinone production, and the waste acid, residual acid, and acidic washing liquid derived from the process are all acidic wastewater that can be used to adjust the acidity for the Fenton reaction.

[0031] Reference Figure 1 Preferably, the third overflow conduit 410 is a bent pipe, with the input end of the third overflow conduit 410 extending to the lower part of the cavity of the corresponding biochemical tank 400, and the output end of the third overflow conduit 410 extending to the upper part of the cavity of the corresponding biochemical tank 400.

[0032] Reference Figure 1 The operation process of this utility model includes a Fenton reaction step, a phosphorus removal step, a flocculation and impurity removal step, and a biochemical decomposition of organic matter step.

[0033] Fenton reaction steps: The acidified anthraquinone wastewater is discharged into Fenton reaction tank 200. Ferrous liquid and oxidation residue are also discharged into Fenton reaction tank 200. The oxidation residue is the residue from hydrogen peroxide production, meaning it contains a certain amount of H2O2 and Fe. 2+ The solution can be prepared using ferrous sulfate; the solutions in the Fenton reaction tank 200 are stirred, Fe 2+ Catalytic decomposition of H2O2 causes H2O2 to decompose into hydroxyl radicals (·OH) and hydroxide ions (OH-) under acidic conditions. - Hydroxyl radicals (·OH) have strong oxidizing properties, making them suitable for effectively degrading recalcitrant organic matter in anthraquinone wastewater. This process breaks down anthraquinone organic matter into smaller molecules, reducing wastewater pollution and improving its biodegradability. Some anthraquinone organic matter is even directly degraded into CO2 and H2O. 2+ Fe obtained from the conversion 3+ Suitable for reacting with hydroxide ions (OH-) -The ions combine to form Fe(OH)3 crystals. After the Fenton reaction, the Fenton reaction tank 200 mainly contains small molecule organic matter, phosphate, Fe(OH)3 suspension crystals, and water.

[0034] H2O2, Fe 2+ hydroxyl radicals (·OH), Fe 3+ Both are used to exert a catalytic effect, and their content in wastewater is low. Fe(OH)3 crystals mainly exist as suspended matter.

[0035] Fe 2+ It primarily functions as a catalyst, with small amounts suitable for phosphorus removal. The phosphorus remover can be an aluminum salt to derive aluminum phosphate crystals; it can also be a chelated polyphosphate agent as described below, where the chelating group coordinates with the phosphate group to form stable crystals.

[0036] Phosphorus removal step: Add phosphorus removal agent to Fenton reaction tank 200 to cause phosphate ions to crystallize.

[0037] In wastewater, PO4 3+ The content is low, and phosphoric acid crystals mainly exist as suspended matter. After the Fenton reaction and phosphorus removal, the Fenton reaction tank 200 mainly contains small molecule organic matter, suspended crystals, and water.

[0038] Among the multiple Fenton reaction tanks 200, some Fenton reaction tanks 200 are used for adding materials and mixing, some Fenton reaction tanks 200 are suitable for continuous liquid-liquid reaction, and some are suitable for polyphosphoric crystallization.

[0039] Flocculation and impurity removal steps: One end of the coagulation tank 300 receives the liquid discharged from the Fenton reaction tank 200. Flocculant is introduced into this end of the coagulation tank 300. The suspended solids combine with the flocculant to form flocs. The flocs gradually settle during horizontal flow. The supernatant, consisting of small molecule organic matter and water, overflows from the coagulation tank 300. The flocculant can be a colloid such as Al(OH)3, which adsorbs and / or traps suspended solids to form flocs. The flocculant can also be microbial polysaccharides or proteins, which adsorb and crystallize through active groups. Residual proteins are also easily decomposed by microorganisms in the biological treatment tank 400.

[0040] Biochemical decomposition of organic matter: The biochemical tank 400 is filled with sewage, which is rich in a certain amount of microorganisms. The biochemical tank 400 receives the sewage after sedimentation and uses the decomposition of microorganisms to further degrade the small molecule organic matter obtained from the decomposition of anthraquinone organic matter, forming CO2 and H2O.

[0041] Compared with existing technologies, the beneficial effects of this application include: making full use of oxidation residue and effectively reducing phosphoric acid content, thereby improving emission quality.

[0042] Reference Figure 1 , Figure 2In some embodiments of this invention, the phosphorus removal agent storage tank is a chelated polyphosphate storage tank. The chelating groups (such as carboxyl, amino, hydroxyl, etc.) undergo a coordination reaction with phosphate ions to form crystals; and / or, the porous structure or large specific surface area of ​​the chelated phosphorus removal agent can further remove phosphates from the water through physical adsorption, such as potentially produced iron phosphate and aluminum phosphate. On the other hand, the chelated polyphosphate agent can chelate iron ions, preventing their precipitation and ensuring the Fenton reaction (Fe... 2 Catalysis) continues to be highly efficient, that is, ensuring Fe 2 It provides sustained and efficient catalysis, prolonging its catalytic effect in the Fenton reaction and improving the generation efficiency of hydroxyl radicals.

[0043] In some embodiments of this utility model, the Fenton reaction tank 200 is equipped with an acid-base meter / pH meter, and the Fenton reaction tank 200 is connected to an alkali tank. After the Fenton reaction, if the pH of the Fenton reaction tank 200 is too low, alkali is added to adjust the pH to 6-9 to ensure the formation of stable chelate crystals.

[0044] Reference Figure 1 , Figure 2 In some embodiments of this invention, a blower pipe suitable for connecting to a Roots blower is inserted into the Fenton reaction tank 200. The Roots blower is suitable for agitating the liquid and solid matter in the Fenton reaction tank 200. The Roots blower is similar to a gear pump, relying on two impellers rotating in opposite directions within the casing. The periodic change in space between the impellers and the casing achieves stable gas intake and exhaust. The gaps between the impellers and between the impellers and the casing are very small, ensuring that the gas does not flow back. Furthermore, the rising and bursting of bubbles creates turbulence in the water, promoting full contact between the chelated polyphosphate agent and the phosphate in the water, improving reaction efficiency. In addition, it facilitates uniform mixing, avoiding localized over- or under-addition of reagents and ensuring uniform removal of phosphates. The agitation of the gas prevents the formation of crystals (such as FePO4 and AlPO4) from settling at the bottom of the tank, keeping them in suspension for subsequent sedimentation or filtration separation.

[0045] Reference Figure 1 In some embodiments of this utility model, multiple filter tanks 500 connected in series via a fourth overflow conduit 510 are also included. The biological treatment tank 400 is adapted to discharge the biologically treated wastewater to the first filter tank 500, and after filtration by multiple filter tanks 500, it is discharged; reducing any stubborn suspended solids that may remain, such as particles detached from the tank pipes, fecal sand and gravel particles, suspended colloids, etc.

[0046] Reference Figure 3In some embodiments of this invention, multiple grease traps 110 connected in series via a first overflow conduit 111 are also included. The first overflow conduit 111 is a bent pipe, with its input end extending to the lower part of the cavity of the corresponding grease trap 110 and its output end extending to the upper part of the cavity of the corresponding grease trap 110. The first grease trap 110 is suitable for receiving anthraquinone production wastewater, and the last grease trap 110 is suitable for overflowing the degreased wastewater into the wastewater collection tank 120. The Fenton reaction tank 200 is suitable for receiving the wastewater from the wastewater collection tank 120. In this invention, the grease traps 110 pre-remove floating grease, emulsified oil, etc., to prevent the Fenton reaction from reaching floating organic matter.

[0047] Reference Figure 3 In some embodiments of this utility model, an emergency pool 130 is also included. The sewage collection pool 120 is adapted to overflow sewage into the emergency pool 130 via a second overflow conduit 121. At least two pumps are connected in parallel between the sewage collection pool 120 and the Fenton reaction tank 200, meaning each pump can independently pump sewage from the sewage collection pool 120 to the Fenton reaction tank 200. The sewage collection pool 120 is equipped with a level gauge, and at least one pump is adapted to start and stop based on feedback from the level gauge indicating a low or high water level. These at least two pumps can be partially started and stopped manually, or partially started and stopped automatically based on the water level.

[0048] Reference Figure 1 , Figure 4 In some embodiments of this utility model, the coagulation tank 300 includes a mixing turbulent flow zone and a horizontal overflow zone. The horizontal overflow zone is provided with a horizontal flow pool 350 with a volume larger than that of the mixing turbulent flow zone. A turbulent flow grid 320 is provided at the lower part of the mixing turbulent flow zone. A mixing grid 310, a dispersing grid 340, and a transition grid 330 are arranged sequentially at the upper part of the horizontal flow pool 350 in a manner flush with one end. Part of the inner bottom of the mixing grid 310 is suitable for receiving and mixing Fenton wastewater and flocculant. Part of the inner bottom of the mixing grid 310 is suitable for the turbulent flow grid 320 to suck in the flocculated wastewater. The dispersing grid 340 is suitable for connecting the turbulent flow grid 320 through the transition grid 330. The dispersing grid 340 is suitable for overflowing the flocculated wastewater into the horizontal flow pool 350. An overflow channel 360 is provided at the other end of the horizontal flow pool 350.

[0049] Reference Figure 4In the coagulation tank 300, the material flow direction from the feeding to the horizontal flow is sequentially V1, V2, V3, V4, V5, V6, and V7. The material and liquid flow sequentially through the mixing grid 310, the turbulent flow grid 320, the transition grid 330, the divergence grid 340, the horizontal flow tank 350, and the overflow channel 360. The suspended solids in the sewage are sequentially mixed, flocculated, condensed, settled, and overflowed. In this utility model, the horizontal flow tank 350 is relatively large while the mixing turbulent flow zone is relatively small. The sewage flows more strongly in the mixing turbulent flow zone, effectively condensing and combining with the flocs, and then settles and settles the flocs in the horizontal flow tank 350 at a slower flow rate. Among them, the turbulent flow grid 320 is the total length of the mixing grid 310, the divergence grid 340, and the transition grid 330. After the sewage is mixed with flocs, it stays at the bottom and flows turbulently along a longer path, effectively agglomerating the suspended solids and flocculants into flocs.

[0050] Reference Figure 1 , Figure 4 In some embodiments of this utility model, the horizontal flow pool 350 has multiple grooves 351 arranged side by side from one end to the other. The grooves 351 are adapted to prevent flocs from rolling from one end of the horizontal flow pool 350 to the other end. During the horizontal flow process, the flocculated sewage settles in each groove, and the flocs are separated more fully. Multiple floc discharge holes 352 are arranged axially at the bottom of the grooves 351.

[0051] Reference Figure 1 In some embodiments of this invention, an aeration pipe is inserted into the biological treatment tank 400, and the aeration pipe is connected to an aeration blower. The blower is adapted to blow air / compressed air into the biological treatment tank 400 to provide oxygen to the microorganisms and support their degradation of organic matter; in addition, the rising bubbles and liquid flow keep the sludge suspended, ensuring that the microorganisms are in full contact with the sewage, and removing volatile organic compounds and harmful gases that may be contained in the sewage through aeration.

[0052] The above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Any modifications or equivalent substitutions that do not depart from the spirit and scope of this utility model should be covered within the scope of the technical solution of this utility model.

Claims

1. A wastewater treatment device for the production of 2-alkylanthraquinone, characterized in that, include: At least three Fenton reaction tanks are suitable for connecting a wastewater collection tank, a ferrous liquid storage tank, an oxide residue storage tank, and a phosphorus removal agent storage tank. The output pipes of the at least three Fenton reaction tanks are connected to the Fenton discharge pipe through separate on / off valves. Multiple coagulation tanks are connected to the Fenton discharge pipe via individual on / off valves. The mixing tanks are connected to the flocculant storage tank. The overflow outlets of the multiple coagulation tanks are connected to the sedimentation discharge pipe via individual on / off valves. Multiple biological treatment tanks are connected in series via a third overflow conduit. The first biological treatment tank is connected to the post-settling discharge pipe and is suitable for receiving sewage.

2. The wastewater treatment device for 2-alkylanthraquinone production according to claim 1, characterized in that, The phosphorus removal agent storage tank is a chelated polyphosphate agent storage tank.

3. The wastewater treatment device for 2-alkylanthraquinone production according to claim 2, characterized in that, The Fenton reaction tank is fitted with an air pipe suitable for connecting to a Roots blower, which is adapted to agitate the liquid in the Fenton reaction tank.

4. The wastewater treatment apparatus for 2-alkylanthraquinone production according to any one of claims 1 to 3, characterized in that, The Fenton reaction tank is equipped with an acid-base meter, and the Fenton reaction tank is connected to an alkali tank.

5. The wastewater treatment apparatus for 2-alkylanthraquinone production according to any one of claims 1 to 3, characterized in that, It also includes multiple filter tanks connected in series via a fourth overflow conduit, wherein the biological treatment tank is adapted to discharge the biologically treated wastewater to the first filter tank.

6. The wastewater treatment apparatus for 2-alkylanthraquinone production according to any one of claims 1 to 3, characterized in that, It also includes multiple oil separators connected in series via a first overflow conduit. The first overflow conduit is a bend, with its inlet extending to the lower part of the cavity of the corresponding oil separator and its outlet extending to the upper part of the cavity of the corresponding oil separator. The first oil separator is suitable for receiving anthraquinone production wastewater, and the last oil separator is suitable for overflowing the de-oiled wastewater into a wastewater collection tank. The Fenton reaction tank is suitable for receiving the wastewater from the wastewater collection tank.

7. The wastewater treatment device for 2-alkylanthraquinone production according to claim 6, characterized in that, It also includes an emergency pool, the sewage collection pool is adapted to overflow sewage into the emergency pool through a second overflow pipe, at least two pumps are connected in parallel between the sewage collection pool and the Fenton reaction tank, the sewage collection pool is equipped with a level gauge, and at least one of the pumps is adapted to start and stop when the level gauge feeds back a low or high water level.

8. The wastewater treatment apparatus for 2-alkylanthraquinone production according to any one of claims 1 to 3, characterized in that, The coagulation tank includes a mixing turbulent flow zone and a horizontal flow overflow zone. The horizontal flow overflow zone is equipped with a horizontal flow pool with a volume larger than that of the mixing turbulent flow zone. A turbulent flow grid is provided at the bottom of the mixing turbulent flow zone, and a mixing grid, a diverging grid, and a transition grid are arranged sequentially at the top of the mixing zone, flush with one end of the horizontal flow pool. Part of the inner bottom of the mixing grid is adapted to receive and mix the Fenton wastewater and flocculant. Part of the inner bottom of the mixing grid is adapted to allow the turbulent flow grid to draw in the mixed wastewater. The diverging grid is adapted to connect with the turbulent flow grid through the transition grid. The diverging grid is adapted to overflow the mixed wastewater into the horizontal flow pool. An overflow channel is provided at the other end of the horizontal flow pool.

9. The wastewater treatment apparatus for 2-alkylanthraquinone production according to claim 8, characterized in that, The horizontal flow pool has multiple grooves arranged side by side from one end to the other, and the bottom of the grooves has multiple filament discharge holes arranged axially.

10. The wastewater treatment apparatus for 2-alkylanthraquinone production according to any one of claims 1 to 3, characterized in that, The biochemical tank is equipped with an aeration pipe, which is connected to an aeration fan.

Images