A silicon-containing wastewater treatment system

Abstract

This application relates to the field of wastewater treatment systems, specifically disclosing a silicon-containing wastewater treatment system. It includes a pretreatment unit, a hydrolysis unit, and an adsorption-sedimentation unit. The pretreatment unit includes an oil separator, a collection tank connected to one side of the oil separator, an oxidation device connected to the collection tank, a neutralization device connected to the oxidation device, and an air flotation device connected to the neutralization device. The neutralization device includes a reaction tank and several dosing devices connected to a stirring tank. The reaction tank includes a reaction zone located at the inlet, a sedimentation zone located below the reaction zone, an effluent zone located on the side of the reaction tank away from the reaction zone, and a water distribution zone located on the side of the reaction zone away from the inner wall of the reaction tank. The silicon-containing wastewater treatment system of this application has the advantage of improving the treatment efficiency of silicon disproportionation wastewater.

Description

Technical Field

[0001] This application relates to the field of wastewater treatment systems, and more particularly to a silicon-containing wastewater treatment system. Background Technology

[0002] Organosilicon is widely used in electronics, information, energy, and materials due to its many unique properties, and is an indispensable material for many emerging industries. The disproportionation process of organosilicon generates a large amount of silicon-containing wastewater.

[0003] The disproportionation reaction of organosilicon monomers is a key process for realizing the resource utilization of by-products. However, the resulting high-concentration wastewater has a complex composition, high pollution load, and is extremely difficult to treat. Current treatment processes consume a large amount of reagents, and the subsequent wastewater has high biochemical toxicity, making it difficult for microorganisms to survive, resulting in low wastewater treatment efficiency. Utility Model Content

[0004] To improve wastewater treatment efficiency, this application provides a silicon-containing wastewater treatment system.

[0005] The silicon-containing wastewater treatment equipment provided in this application adopts the following technical solution: A silicon-containing wastewater treatment system includes a pretreatment unit, a hydrolysis unit, and an adsorption sedimentation unit. The pretreatment unit includes an oil separator, a collection tank connected to one side of the oil separator, an oxidation device connected to the collection tank, a neutralization device connected to the oxidation device, and an air flotation device connected to the neutralization device. The neutralization device includes a reaction tank and several dosing devices connected to the reaction tank. The reaction tank includes a reaction zone located at the water inlet of the reaction tank, a sedimentation zone located below the reaction zone, an effluent zone located on the side of the reaction tank away from the reaction zone, and a water distribution zone located on the side of the reaction zone away from the inner wall of the reaction tank.

[0006] By adopting the above technical solutions, the pretreatment unit can remove most of the organic components in the water through oil separation and oxidation steps. The hydrolysis unit can hydrolyze most of the non-soluble substances into soluble substances, generating VFA, alcohols, etc., which are then acidified into acetic acid, etc., and finally produce methane. While removing most organic pollutants, it can also improve the biodegradability of wastewater. Finally, the adsorption and precipitation unit further purifies the water to obtain clean water. The neutralization device integrates the neutralization reaction and precipitation function into a single reaction tank, which can greatly save floor space, reduce connecting pipes and civil engineering costs, and improve the system's compactness.

[0007] Optionally, the reaction zone is located at the top of the reaction tank. The reaction zone includes a neutralization reaction section and a flocculation reaction section. A first flow hole is provided between the neutralization reaction section and the flocculation reaction section. The first flow hole is located near the bottom of the reaction zone. A second flow hole is provided on the side of the flocculation reaction section near the water distribution area.

[0008] By adopting the above technical solution, since the wastewater after the oxidation device is acidic, it is necessary to add alkali to neutralize it. The reaction area is divided into two functional areas so that each functional area can maximize efficiency. The flocculation reaction section can form smaller flocs and overflow to the water distribution area through the second overflow hole.

[0009] Optionally, some of the dosing devices include a dosing pump and a dissolving device connected to the dosing pump, wherein a dispersing mixer is connected to the top of the dissolving device, and the dosing devices are respectively equipped with liquid alkali, PAC and PAM.

[0010] By adopting the above technical solution, the oxidized wastewater is neutralized, and then the products are flocculated using PAC and PAM, which effectively reduces the biotoxicity of subsequent wastewater and facilitates its treatment.

[0011] Optionally, a first mixer and a second mixer are respectively provided in the neutralization reaction section and the flocculation reaction section, wherein the stirring rate of the first mixer is higher than that of the second mixer.

[0012] By employing the above technical solutions, the rapid stirring in the neutralization reaction section ensures that the reagent and wastewater are thoroughly mixed instantly. The slow stirring in the flocculation reaction section promotes rapid flocculation of the internal liquid.

[0013] Optionally, the bottom of the sedimentation zone is provided with several sludge hoppers, and the bottom of the sludge hoppers is provided with sludge discharge holes for sludge discharge. The inner radial direction of the sludge hoppers gradually decreases towards the sludge discharge holes.

[0014] By adopting the above technical solution, the inner diameter of the mud bucket is gradually reduced, allowing the deposited sediment to slide naturally down the side wall of the mud bucket and collect at the central mud discharge hole, thus preventing the sludge from accumulating and hardening in the flat bottom area.

[0015] Optionally, a plurality of water distribution holes are provided at the bottom of the water distribution area.

[0016] By adopting the above technical solution, the water distribution holes enable the neutralized and flocculated wastewater to be discharged evenly.

[0017] Optionally, the hydrolysis unit includes a mixing tank, a hydrolysis tank connected to the mixing tank, and an aeration tank connected to the hydrolysis tank, wherein the mixing tank is connected to an air flotation device.

[0018] By adopting the above technical solution, the mixing tank can mix the pretreated wastewater with other domestic sewage, floor washing wastewater, etc., for further water quality adjustment. Then, the hydrolysis tank hydrolyzes most of the non-dissolved substances into soluble substances. Finally, the aeration tank further efficiently removes nitrogen, phosphorus and other organic pollutants. Optionally, the adsorption and sedimentation unit includes a water storage tank, a carbon adsorption tank connected to the water storage tank, a final sedimentation tank connected to the carbon adsorption tank, and a sludge tank connected to the final sedimentation tank. A carbon circulation pump is connected to the outside of the carbon adsorption tank, and the carbon circulation pump is used to lift the water at the bottom of the tank to the top.

[0019] By adopting the above technical solution, the carbon circulation pump enables the activated carbon to flow continuously within the carbon adsorption tank, allowing it to fully contact the substances in the wastewater and effectively improve the adsorption effect.

[0020] In summary, this application has the following beneficial effects: 1. By setting up a neutralization device, the oxidized wastewater is neutralized and flocculated, reducing the biochemical toxicity of subsequent wastewater, facilitating subsequent sewage treatment, and improving efficiency.

[0021] 2. By setting up a carbon circulation pump, the contact area between activated carbon and wastewater is effectively increased, thereby improving the adsorption effect. Attached Figure Description

[0022] Figure 1 This is a flowchart of a silicon-containing wastewater treatment system according to an embodiment of this application; Figure 2 This is a schematic diagram of the structure of the neutralization device according to an embodiment of this application; Figure 3 This is a schematic diagram of the internal structure of the neutralization device according to an embodiment of this application; Figure 4 This is a cross-sectional view of the neutralization device according to an embodiment of this application along line 1-1; Figure 5 This is a cross-sectional view of the neutralization device according to an embodiment of this application along line 2-2; Figure 6 This is a schematic diagram of the structure of the carbon adsorption tank according to an embodiment of this application.

[0023] Explanation of reference numerals in the attached drawings: 1. Pretreatment unit; 11. Oil separator; 12. Water collection tank; 13. Oxidation device; 14. Neutralization device; 141. Reaction tank; 1411. Reaction zone; 1412. Sedimentation zone; 1413. Effluent zone; 1414. Water distribution zone; 1415. Water distribution hole; 1416. Neutralization reaction section; 1417. Flocculation reaction section; 1418. First flow hole; 1419. Second flow hole; 142. Chemical dosing device 1. Dosing pump; 1422. Dissolving device; 1423. Dispersing mixer; 143. First mixer; 144. Second mixer; 146. Sludge hopper; 1461. Sludge discharge hole; 15. Air flotation device; 2. Hydrolysis unit; 21. Mixing tank; 22. Hydrolysis tank; 23. Aeration tank; 3. Adsorption sedimentation unit; 31. Water storage tank; 32. Carbon adsorption tank; 33. Final sedimentation tank; 34. Sludge tank; 35. Carbon circulation pump. Detailed Implementation

[0024] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0025] This application discloses a silicon-containing wastewater treatment system. (Refer to...) Figure 1 The silicon-containing wastewater treatment system includes a pretreatment unit 1, a hydrolysis unit, and an adsorption-precipitation unit 3. The disproportionated wastewater generated during organosilicon production first undergoes oxidation, neutralization, and flocculation in the pretreatment unit 1 to remove recalcitrant organic molecules and colloidal particles. Then, the organic molecules are further degraded in the hydrolysis unit 2. Finally, the residual trace organic matter in the wastewater is adsorbed and settled in the adsorption-precipitation unit 3, thus completing the wastewater purification process.

[0026] Reference Figure 1 , Figure 2 The pretreatment unit 1 includes an oil separator 11, a water collection tank 12 connected to the oil separator 11, an oxidation device 13 connected to the water collection tank 12, a neutralization device 14 connected to the oxidation device 13, and an air flotation device 15 connected to the neutralization device 14. During pretreatment, the organosilicon disproportionation wastewater first enters the oil separator 11, where some oil is removed. It then enters the oxidation device 13, where the pH is adjusted to 3-3.5, and an oxidant is added under these acidic conditions to oxidize recalcitrant substances, thereby improving subsequent biodegradability. Afterward, it enters the neutralization device 14, where the pH is adjusted to approximately 7-8, and a flocculant is added to flocculate some substances, thus completing the separation. Finally, it enters the air flotation device 15, where suspended oily substances are removed through flotation, facilitating subsequent biochemical degradation treatment.

[0027] Reference Figure 2 , Figure 3The neutralization device 14 includes a reaction tank 141 and several dosing devices 142 connected to the reaction tank 141. The reaction tank 141 includes a reaction zone 1411 located at the water inlet of the reaction tank 141, a sedimentation zone 1412 located below the reaction zone 1411, an outlet zone 1413 located on the side of the reaction tank 1411 away from the reaction zone 1411, and a water distribution zone 1414 located on the side of the reaction zone 1411 away from the inner wall of the reaction tank 141. The bottom of the water distribution zone 1414 has several water distribution holes 1415 at equal intervals. After the wastewater reacts in the reaction zone 1411, it enters the sedimentation zone 1412 evenly through the water distribution zone 1414. During the flow of the wastewater in the sedimentation zone 1412, some of the flocculated substances will gradually settle and finally enter the next device from the outlet zone 1413. The dosing device 142 includes a dosing pump 1421 and a dissolving device 1422 connected to the dosing pump 1421. A dispersing mixer 1423 is connected to the top of the dissolving device 1422. Several dosing devices 142 are respectively filled with NaOH, PAC, and PAM. The dosing devices 142 are directly connected to the reaction zone 1411, so that after the wastewater enters the reaction zone 1411, the dosing device 142 first adds NaOH to the reaction zone 1411 to adjust the pH, and then adds PAC and PAM in sequence for suspension coagulation.

[0028] Reference Figure 3 , Figure 4 and Figure 5 The reaction zone 1411 includes a neutralization reaction section 1416 and a flocculation reaction section 1417. A first flow passage 1418 is provided between the neutralization reaction section 1416 and the flocculation reaction section 1417, and the first flow passage 1418 is located near the bottom wall of the reaction zone 1411. A second flow passage 1419 is provided on the side of the flocculation reaction section 1417 near the water distribution area 1414. After the wastewater enters the reaction zone 1411, it first passes through the neutralization reaction section 1411 for pH adjustment, and then enters the flocculation reaction section 1417 through the first flow passage 1418, where PAC and PAM are added sequentially for coagulation and sedimentation. The first flow passage 1418 is located at the bottom, allowing the water flow to form an upward flow in the flocculation reaction section 1417, enabling faster floc formation during top chemical addition and improving flocculation efficiency. The neutralization reaction section 1416 and the flocculation reaction section 1417 are respectively equipped with a first mixer 143 and a second mixer 144. The mixing speed of the first mixer 143 is higher than that of the second mixer 144. The rotation speed of the first mixer 143 is 60-80 rpm, and the rotation speed of the second mixer 144 is 15-20 rpm. The higher rotation speed of the first mixer 143 ensures that NaOH is quickly and evenly mixed after being added to the neutralization reaction section 1416, thereby ensuring that the overall pH of the wastewater can be adjusted to about 7-8. The lower rotation speed of the second mixer 144 ensures sufficient contact between the flocculant and the colloidal particles in the water without breaking the flocs, thus improving the flocculation effect.

[0029] Reference Figure 3 , Figure 4 and Figure 5 The sedimentation zone 1412 has several sludge hoppers 146 at its bottom. The edges of the openings of adjacent sludge hoppers 146 fit together to ensure that the sedimentation zone 1412 does not form a flat bottom. The bottom of each sludge hopper 146 has a sludge discharge hole 1461 for sludge discharge. The diameter of the sludge hopper 146 gradually decreases towards the sludge discharge hole 1461. The sediment in the sedimentation zone 1412 can slide naturally down the side wall of the sludge hopper 146 and collect at the central sludge discharge hole 1461, thus facilitating subsequent cleaning.

[0030] Reference Figure 1 The hydrolysis unit 2 includes a mixing tank 21, a hydrolysis tank 22 connected to the mixing tank 21, and an aeration tank 23 connected to the hydrolysis tank 22. The mixing tank 21 is connected to the air flotation device 15. The mixing tank 21 can mix the wastewater treated by the pretreatment unit 1 with other domestic sewage, floor washing wastewater, etc., so as to further adjust the water quality. The hydrolysis tank 22 contains some anaerobic bacteria. Through hydrolysis by anaerobic bacteria, most of the non-soluble substances are hydrolyzed into soluble substances, generating VFA, alcohols, etc., which are then acidified into acetic acid, etc., and finally produce methane. While removing most of the organic pollutants, it can also improve the biodegradability of the wastewater. Finally, it enters the aeration tank 23, where aerobic microorganisms can further decompose the organic impurities in the water.

[0031] Reference Figure 1 , Figure 6 The adsorption and sedimentation unit 3 includes a water storage tank 31, a carbon adsorption tank 32 connected to the water storage tank 31, a final sedimentation tank 33 connected to the carbon adsorption tank 32, and a sludge tank 34 connected to the final sedimentation tank 33. A carbon circulation pump 35 is connected to the outside of the carbon adsorption tank 32 to pump water from the bottom of the tank to the top. After water flows into the carbon adsorption tank 32, the activated carbon adsorbs trace pollutants in the water, thereby improving water quality. The carbon circulation pump 35 ensures that the activated carbon continuously flows within the adsorption tank, thus ensuring sufficient contact with substances in the wastewater and effectively improving adsorption efficiency.

[0032] The implementation principle of the silicon-containing wastewater treatment system in this application embodiment is as follows: After the disproportionated wastewater is discharged from the production workshop, it first enters the oil separator 11 to remove some of the grease. Then, it is pumped to the oxidation device 13 to adjust the pH to about 3-3.5 and add oxidant for oxidation. Then, it enters the neutralization device 14 to adjust the pH to 7-8 and add PAC and PAM in sequence for coagulation and sedimentation. Then, it enters the air flotation device 15 to remove suspended oil substances through air flotation, completing the pretreatment. After that, it enters the hydrolysis unit 2 and the adsorption sedimentation unit 3 for treatment together with other domestic wastewater.

[0033] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A silicon-containing wastewater treatment system, characterized in that, The unit includes a pretreatment unit (1), a hydrolysis unit (2), and an adsorption sedimentation unit (3). The pretreatment unit (1) includes an oil separator (11), a water collection tank (12) connected to one side of the oil separator (11), an oxidation device (13) connected to the water collection tank (12), a neutralization device (14) connected to the oxidation device (13), and an air flotation device (15) connected to the neutralization device (14). The neutralization device (14) includes a reaction tank (141) and several... A dosing device (142) is connected to the reaction tank (141). The reaction tank (141) includes a reaction zone (1411) located at the water inlet of the reaction tank (141), a sedimentation zone (1412) located below the reaction zone (1411), a water outlet zone (1413) located on the side of the reaction tank (141) away from the reaction zone (1411), and a water distribution zone (1414) located on the side of the reaction zone (1411) away from the inner wall of the reaction tank (141).

2. The silicon-containing wastewater treatment system according to claim 1, characterized in that: The reaction zone (1411) is located on the upper part of the reaction tank (141). The reaction zone (1411) includes a neutralization reaction section (1416) and a flocculation reaction section (1417). A first flow hole (1418) is provided between the neutralization reaction section (1416) and the flocculation reaction section (1417). The first flow hole (1418) is close to the bottom of the reaction zone (1411). A second flow hole (1419) is provided on the side of the flocculation reaction section (1417) close to the water distribution area (1414).

3. The silicon-containing wastewater treatment system according to claim 1, characterized in that: Several of the dosing devices (142) include a dosing pump (1421) and a dissolving device (1422) connected to the dosing pump (1421). The dissolving device (1422) is connected to a dispersing mixer (1423) at the top. The dosing devices (142) are respectively filled with liquid alkali, PAC and PAM.

4. The silicon-containing wastewater treatment system according to claim 2, characterized in that: The neutralization reaction section (1416) and the flocculation reaction section (1417) are respectively equipped with a first mixer (143) and a second mixer (144), and the mixing speed of the first mixer (143) is higher than that of the second mixer (144).

5. The silicon-containing wastewater treatment system according to claim 1, characterized in that: The sedimentation zone (1412) is provided with several sludge hoppers (146) at the bottom. The bottom of the sludge hoppers (146) is provided with sludge discharge holes (1461) for sludge discharge. The inner radial direction of the sludge hoppers (146) gradually decreases towards the sludge discharge holes (1461).

6. The silicon-containing wastewater treatment system according to claim 1, characterized in that: The bottom of the water distribution area (1414) is provided with several water distribution holes (1415).

7. The silicon-containing wastewater treatment system according to claim 1, characterized in that: The hydrolysis unit (2) includes a mixing tank (21), a hydrolysis tank (22) connected to the mixing tank (21), and an aeration tank (23) connected to the hydrolysis tank (22). The mixing tank (21) is connected to the air flotation device (15).

8. The silicon-containing wastewater treatment system according to claim 1, characterized in that: The adsorption and sedimentation unit (3) includes a water storage tank (31), a carbon adsorption tank (32) connected to the water storage tank (31), a final sedimentation tank (33) connected to the carbon adsorption tank (32), and a sludge tank (34) connected to the final sedimentation tank (33). A carbon circulation pump (35) is connected to the outside of the carbon adsorption tank (32), and the carbon circulation pump (35) is used to lift the water at the bottom of the tank to the top.

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