Method for co-processing marigold squeezed waste liquid by organic silicon wastewater treatment system

Abstract

The invention discloses a method for co-processing marigold squeezed waste liquid by an organic silicon wastewater treatment system. The method comprises the following steps: (1) wastewater pretreatment: carrying out oil separation and air flotation treatment on organic silicon wastewater; (2) evaporating and desalting: evaporating the organic silicon wastewater to remove salt in the organic silicon wastewater; (3) biochemical treatment: the organic silicon wastewater is subjected to biochemical treatment after being adjusted, meanwhile, marigold production waste liquid is added, and the removal rate of COD in the organic silicon wastewater subjected to biochemical treatment reaches 50% or above; and (4) precipitation treatment: carrying out mud-water separation on the organic silicon wastewater, discharging the organic silicon wastewater subjected to mud-water separation for recycling, and transporting the sludge for treatment. According to the method, the marigold production waste liquid is used for replacing glucose to serve as a supplement for the BOD value in the biochemical reaction of the organic silicon wastewater, the purification treatment cost of the marigold production waste liquid can be reduced, the nutrient solution supplement cost of the biochemical reaction can be effectively reduced, and the treatment effect of the organic silicon wastewater can be effectively improved.

Description

Technical Field

[0001] The invention belongs to the technical field of resource disposal of industrial wastewater, and specifically relates to a method for coordinating the disposal of marigold squeezing waste liquid with an organosilicon wastewater treatment system. Background Art

[0002] The production process of organosilicon mainly includes the synthesis of chloromethane, synthesis of dimethyldichlorosilane monomer, hydrolysis of dimethyl monomer, cracking of siloxane, etc., and finally synthesizes four major types of organosilicon products: silicone oil, silicone rubber, silicone resin, and silane coupling agent. From the perspective of synthesis process, the production of organosilicon uses methanol, hydrogen chloride and silicon powder as raw materials, and metal ions such as iron, zinc, and copper as catalysts, but there are no chlorine, metal ions and other components in the product. In addition to being partially recycled, most of them flow into production wastewater. At the same time, raw materials, silicon intermediates, oligomers, etc. that are not completely reacted during the process synthesis also constitute the main components of organosilicon wastewater. Analysis shows that the main pollutants in organosilicon wastewater are COD, pH (strong acid), SS, NH 3 -N, and high salt (mainly chloride salt). Among them, the main component of COD is siloxane-type organic matter, which contains linear, cyclic or cross-linked polymers with Si-O-Si bonds as the main chain, and belongs to the difficult-to-biodegrade organic matter. Organosilicon wastewater is a very difficult to treat industrial wastewater. At present, the treatment of organosilicon wastewater is divided into two parts: physicochemical treatment and biochemical treatment. In the physicochemical treatment stage, macromolecules are converted into small molecules and ring structures are converted into chain structures, which further improves the BOD / COD ratio of wastewater and increases the biodegradability of wastewater, creating a good environment for subsequent biochemical treatment. Biochemical treatment is mainly activated sludge method, which uses the biological coagulation, adsorption and oxidation of activated sludge to decompose and remove organic pollutants in sewage. When treating organic pollutants, activated sludge needs to be supplemented with sufficient nutrients as nutrients for microbial metabolism and reproduction. In order to ensure the treatment capacity of the biochemical system, the C:N:P of the biochemical system needs to be maintained at 100:5:1. Among them, the biological oxygen demand value BOD is particularly important in biochemical operation, and it is necessary to maintain the BOD of the biochemical system. D:COD=0.3~0.5. In the existing technology, in order to maintain the constant ratio of BOD:COD=0.3~0.5 in the biochemical system, it is necessary to supplement glucose in the treatment process of organic silicon wastewater. Although the supplementation of glucose can maintain the BOD:COD of organic silicon wastewater at 0.3~0.5, glucose is a sugar product prepared from sucrose or starch. Long-term use in organic silicon wastewater will seriously increase the treatment cost of organic silicon wastewater. In addition, since the organic silicon wastewater entering the biochemical system is only simply subjected to sedimentation and stratification treatment, the sedimentation and stratification treatment can only separate part of the water-insoluble silicone oil and silica gel, and cannot separate the water-soluble silicone oil in the wastewater. After the organic silicon wastewater enters the biochemical system, the removal efficiency of COD in the organic silicon wastewater will also be relatively low. Therefore, it is an objective need to develop a method for coordinating the treatment of marigold squeezing wastewater with an organic silicon wastewater treatment system that is advanced in technology, easy to implement, can not only improve the wastewater treatment effect, but also significantly reduce the production cost. Summary of the invention

[0003] In order to solve the technical problems of high glucose use cost and unsatisfactory wastewater treatment effect existing in the background technology, the purpose of the present invention is to provide a method for coordinating the treatment of marigold squeezing waste liquid with an organosilicon wastewater treatment system which is technologically advanced and easy to implement and can both improve the wastewater treatment effect and significantly reduce the production cost.

[0004] The method for co-disposing marigold squeezing waste liquid by using an organosilicon wastewater treatment system according to the present invention comprises the following steps: ①Wastewater pretreatment: The organic silicon wastewater is introduced into the grease trap for sedimentation to remove the scum and silicon powder precipitated at the bottom of the organic silicon wastewater. Then the organic silicon wastewater in the grease trap is introduced into the flotation device for flotation removal to remove suspended impurities and silicone oil in the organic silicon wastewater. ② Evaporation and desalination: The organic silicon wastewater treated in step ① is evaporated in a steam circulation evaporator to remove the salt in the organic silicon wastewater; ③ Biochemical treatment: introduce the organic silicon wastewater treated in step ② into the regulating tank, adjust the pH value of the organic silicon wastewater to 6-9, adjust the temperature of the organic silicon wastewater to 31-35°C, and adjust the conductivity of the organic silicon wastewater to 2500-3500us / cm, then introduce the organic silicon wastewater into the biochemical treatment tank, and add marigold production waste liquid into the biochemical treatment tank at the same time, the BOD content of the marigold production waste liquid is 5000-6000mg / L, the COD content of the marigold production waste liquid is 50000-55000mg / L, and the COD removal rate of the organic silicon wastewater after biochemical treatment reaches more than 50%; ④ Sedimentation treatment: The organic silicon wastewater treated in step ③ is introduced into the sedimentation tank to achieve mud and water separation under the action of gravity. The organic silicon wastewater after mud and water separation is discharged for recycling, and the sludge is transported out for disposal.

[0005] Compared with the traditional treatment of organic silicon wastewater, the advantages of the present invention are: first, the present invention optimizes the pretreatment process of organic silicon wastewater, and adopts the processes of oil separation, flotation and evaporation treatment, which can effectively remove solid particles such as silicon powder, silica gel, and silicone oil salt in the organic silicon wastewater, so that the organic silicon wastewater entering the biochemical treatment process contains only a large amount of AOX (organic halide) and a small amount of COD (organic pollutants), which is conducive to reducing the burden of subsequent biochemical treatment and improving the treatment effect of organic silicon wastewater; second, the present invention uses marigold flower production waste liquid to replace glucose. As a natural plant extract, the marigold flower production waste liquid has good biocompatibility and environmental protection, has a high COD value and total phosphorus, and is added as a nutrient. When added to organosilicon wastewater for use, it can not only maintain the BOD:COD of organosilicon wastewater at 0.3-0.5 and improve the effect of biochemical treatment of organosilicon wastewater, but also the marigold production waste liquid is the wastewater in the production process of lutein extraction from marigold flowers. It can replace glucose as a supplement of BOD value in the biochemical reaction of organosilicon wastewater, which can not only reduce the purification cost of marigold production waste liquid, but also effectively reduce the nutrient solution supplement cost of biochemical reaction. While achieving the coordinated disposal of marigold production waste liquid, it can also effectively improve the treatment effect of organosilicon wastewater, and can make the average removal rate of COD in organosilicon wastewater after biochemical treatment greater than 50%. It has the advantages of advanced technology, easy implementation, and significant environmental benefits, and is easy to promote and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 It is a structural schematic diagram of the present invention; In the figure: 1-grease trap, 2-air flotation device, 3-steam circulation reevaporator, 4-regulating tank, 5-biochemical treatment tank, 6-sedimentation tank, 7-oxidation tank. DETAILED DESCRIPTION

[0007] The present invention is further described below in conjunction with the embodiments and accompanying drawings, but the present invention is not limited in any way. Any changes or substitutions made based on the teachings of the present invention belong to the protection scope of the present invention. Example 1

[0008] The method for co-disposing marigold squeezing waste liquid by the organosilicon wastewater treatment system described in Example 1 comprises the following steps: ① Wastewater pretreatment: The organic silicon wastewater entering the grease trap 1 mainly contains COD, Cl-, siloxane and SS, among which the COD content is 7500-25000mg / L, the Cl- content is 25000-50000mg / L, the siloxane content is 7500-10000mg / L, and the SS content is between 1500-2500mg / L. Cl- refers to the chloride ion content, and SS refers to the content of suspended particles. The organic silicon wastewater is introduced into the grease trap 1 for precipitation to remove Remove the scum and bottom precipitated silicon powder in the organic silicon wastewater, then introduce the organic silicon wastewater in the oil separator 1 into the flotation device 2 for flotation impurity removal, remove the suspended impurities and silicone oil in the organic silicon wastewater, and introduce the organic silicon wastewater after flotation treatment into the oxidation tank 7, and then add ferrous sulfide and hydrogen peroxide into the oxidation tank 7, and after oxidation reaction, oxidize the liquid silicone oil dissolved in the organic silicon wastewater into solid silica gel, and then filter the organic silicon wastewater to further remove the silicone oil dissolved in the wastewater; ② Evaporation and desalination: The organic silicon wastewater treated in step ① is evaporated in a steam circulation re-evaporator 3 to remove the salt in the organic silicon wastewater. The falling film evaporator temperature in the steam circulation re-evaporator 3 is controlled at 96°C, and the forced circulation evaporator temperature is controlled at 104°C; ③ Biochemical treatment: introduce the organosilicon wastewater treated in step ② into the regulating tank 4, adjust the pH value of the organosilicon wastewater to 9, adjust the temperature of the organosilicon wastewater to 35°C, and adjust the conductivity of the organosilicon wastewater to 3500us / cm. Then introduce the organosilicon wastewater into the biochemical treatment tank 5, and add marigold production waste liquid into the biochemical treatment tank 5 at the same time. The BOD content of the marigold production waste liquid is 6000mg / L, and the COD of the marigold production waste liquid is 55000mg / L. The marigold production waste liquid is the wastewater generated during the fermentation, squeezing, dehydration and extraction of marigold flowers. After the organosilicon wastewater enters the biochemical treatment tank 5, it is necessary to take samples to measure the COD of the organosilicon wastewater. If the COD value measured by sampling is greater than the specified value of 1100 mg / L, there is no need to add marigold production waste liquid to the biochemical treatment pool. If the COD value measured by sampling after water distribution is less than the specified value of 1100 mg / L, it is necessary to add marigold production waste liquid to the biochemical treatment pool 5. The amount of marigold production waste liquid added to the biochemical treatment pool 5 needs to be calculated according to the influent COD load of the organic silicon wastewater. The amount of marigold production waste liquid added needs to ensure the ratio of biochemical BOD / COD in the organic silicon wastewater. The addition amount of waste liquid from marigold production is 0.3-0.5. The calculation method of the addition amount of waste liquid from marigold production is: the addition amount of waste liquid from marigold production = the total amount of COD to be supplemented / the COD content of marigold liquid; the total amount of COD to be supplemented = (the actual COD content of the influent COD of the organic silicon wastewater - the designed influent COD content of the organic silicon wastewater) * the influent amount of the biochemical system. After biochemical treatment, the removal rate of COD in the organic silicon wastewater reaches more than 50%, and the sludge lifting ratio SV30 in the biochemical treatment tank is maintained between 30% and 40%. ④ Sedimentation treatment: The organic silicon wastewater treated in step ③ is introduced into the sedimentation tank to achieve mud and water separation under the action of gravity. The organic silicon wastewater after mud and water separation is discharged for recycling, and the sludge is transported out for disposal.

[0009] In this embodiment 1, marigold flower production waste liquid is used to replace glucose. As a natural plant extract, marigold flower production waste liquid has good biocompatibility and environmental protection, and has a high COD value and total phosphorus. It is added to the organosilicon wastewater as a nutrient agent, which can not only maintain the BOD:COD of the organosilicon wastewater at 0.3-0.5, and improve the effect of the biochemical treatment of the organosilicon wastewater, but also replace glucose as a supplementer of the BOD value in the biochemical reaction of the organosilicon wastewater, which can not only reduce the purification cost of marigold production waste liquid, but also effectively reduce the nutrient solution supplement cost of the biochemical reaction. While achieving the coordinated disposal of marigold production waste liquid, it can also effectively improve the treatment effect of the organosilicon wastewater, and can make the average COD removal rate of the organosilicon wastewater after biochemical treatment 54.7%, and the sludge lifting ratio SV30 in the biochemical treatment tank 30%. Example 2

[0010] The method for co-disposing marigold squeezing waste liquid by the organosilicon wastewater treatment system described in Example 2 comprises the following steps: ① Wastewater pretreatment: The organic silicon wastewater entering the grease trap 1 mainly contains COD, Cl-, siloxane and SS, among which the COD content is 7500-25000mg / L, the Cl- content is 25000-50000mg / L, the siloxane content is 7500-10000mg / L, and the SS content is between 1500-2500mg / L. Cl- refers to the chloride ion content, and SS refers to the content of suspended particles. The organic silicon wastewater is introduced into the grease trap 1 for precipitation to remove Remove the scum and bottom precipitated silicon powder in the organic silicon wastewater, then introduce the organic silicon wastewater in the oil separator 1 into the flotation device 2 for flotation impurity removal, remove the suspended impurities and silicone oil in the organic silicon wastewater, and introduce the organic silicon wastewater after flotation treatment into the oxidation tank 7, and then add ferrous sulfide and hydrogen peroxide into the oxidation tank 7, and after oxidation reaction, oxidize the liquid silicone oil dissolved in the organic silicon wastewater into solid silica gel, and then filter the organic silicon wastewater to further remove the silicone oil dissolved in the wastewater; ② Evaporation and desalination: The organic silicon wastewater treated in step ① is evaporated in a steam circulation re-evaporator 3 to remove the salt in the organic silicon wastewater. The falling film evaporator temperature in the steam circulation re-evaporator 3 is controlled at 95°C, and the forced circulation evaporator temperature is controlled at 103°C; ③ Biochemical treatment: introduce the organosilicon wastewater treated in step ② into the regulating tank 4, adjust the pH value of the organosilicon wastewater to 7.5, adjust the temperature of the organosilicon wastewater to 33°C, and adjust the conductivity of the organosilicon wastewater to 3000us / cm. Then introduce the organosilicon wastewater into the biochemical treatment tank 5, and at the same time add marigold production waste liquid into the biochemical treatment tank 5. The BOD content of the marigold production waste liquid is 5500mg / L, and the COD content of the marigold production waste liquid is 52000mg / L. The marigold production waste liquid is the wastewater generated during the fermentation, squeezing, dehydration and extraction of marigold flowers. After the organosilicon wastewater enters the biochemical treatment tank 5, it is necessary to take samples to measure the COD content of the organosilicon wastewater. If the COD value measured by sampling is greater than the specified value of 1100 mg / L, there is no need to add marigold production waste liquid to the biochemical treatment pool. If the COD value measured by sampling after water distribution is less than the specified value of 1100 mg / L, it is necessary to add marigold production waste liquid to the biochemical treatment pool 5. The amount of marigold production waste liquid added to the biochemical treatment pool 5 needs to be calculated according to the influent COD load of the organic silicon wastewater. The amount of marigold production waste liquid added needs to ensure the ratio of biochemical BOD / COD in the organic silicon wastewater. The addition amount of waste liquid from marigold production is 0.3-0.5. The calculation method of the addition amount of waste liquid from marigold production is: the addition amount of waste liquid from marigold production = the total amount of COD to be supplemented / the COD content of marigold liquid; the total amount of COD to be supplemented = (the actual COD content of the influent COD of the organic silicon wastewater - the designed influent COD content of the organic silicon wastewater) * the influent amount of the biochemical system. After biochemical treatment, the removal rate of COD in the organic silicon wastewater reaches more than 50%, and the sludge lifting ratio SV30 in the biochemical treatment tank is maintained between 30% and 40%. ④ Sedimentation treatment: The organic silicon wastewater treated in step ③ is introduced into the sedimentation tank to achieve mud and water separation under the action of gravity. The organic silicon wastewater after mud and water separation is discharged for recycling, and the sludge is transported out for disposal.

[0011] In this embodiment 2, marigold flower production waste liquid is used to replace glucose. As a natural plant extract, marigold flower production waste liquid has good biocompatibility and environmental protection, and has a high COD value and total phosphorus. It is added to the organosilicon wastewater as a nutrient agent, which can not only maintain the BOD:COD of the organosilicon wastewater at 0.3-0.5, thereby improving the effect of the biochemical treatment of the organosilicon wastewater, but also replace glucose as a supplementer of the BOD value in the biochemical reaction of the organosilicon wastewater, which can not only reduce the purification cost of marigold production waste liquid, but also effectively reduce the nutrient solution supplement cost of the biochemical reaction. While achieving the coordinated disposal of marigold production waste liquid, it can also effectively improve the treatment effect of the organosilicon wastewater, and can make the average COD removal rate of the organosilicon wastewater after biochemical treatment 50.8%, and the sludge lifting ratio SV30 in the biochemical treatment tank 35%. Example 3

[0012] The method for co-disposing marigold squeezing waste liquid by the organosilicon wastewater treatment system described in Example 3 comprises the following steps: ① Wastewater pretreatment: The organic silicon wastewater entering the grease trap 1 mainly contains COD, Cl-, siloxane and SS, among which the COD content is 7500-25000mg / L, the Cl- content is 25000-50000mg / L, the siloxane content is 7500-10000mg / L, and the SS content is between 1500-2500mg / L. Cl- refers to the chloride ion content, and SS refers to the content of suspended particles. The organic silicon wastewater is introduced into the grease trap 1 for precipitation to remove Remove the scum and bottom precipitated silicon powder in the organic silicon wastewater, then introduce the organic silicon wastewater in the oil separator 1 into the flotation device 2 for flotation impurity removal, remove the suspended impurities and silicone oil in the organic silicon wastewater, and introduce the organic silicon wastewater after flotation treatment into the oxidation tank 7, and then add ferrous sulfide and hydrogen peroxide into the oxidation tank 7, and after oxidation reaction, oxidize the liquid silicone oil dissolved in the organic silicon wastewater into solid silica gel, and then filter the organic silicon wastewater to further remove the silicone oil dissolved in the wastewater; ② Evaporation and desalination: The organic silicon wastewater treated in step ① is evaporated in a steam circulation re-evaporator 3 to remove the salt in the organic silicon wastewater. The falling film evaporator temperature in the steam circulation re-evaporator 3 is controlled at 94°C, and the forced circulation evaporator temperature is controlled at 102°C; ③ Biochemical treatment: introduce the organosilicon wastewater treated in step ② into the regulating tank 4, adjust the pH value of the organosilicon wastewater to 9, adjust the temperature of the organosilicon wastewater to 31°C, and adjust the conductivity of the organosilicon wastewater to 2500us / cm. Then introduce the organosilicon wastewater into the biochemical treatment tank 5, and add marigold production waste liquid into the biochemical treatment tank 5 at the same time. The BOD content of the marigold production waste liquid is 5000mg / L, and the COD of the marigold production waste liquid is 50000mg / L. The marigold production waste liquid is the wastewater generated during the fermentation, squeezing, dehydration and extraction of marigold flowers. After the organosilicon wastewater enters the biochemical treatment tank 5, it is necessary to take samples to measure the COD of the organosilicon wastewater. If the COD value measured by sampling is greater than the specified value of 1100 mg / L, there is no need to add marigold production waste liquid to the biochemical treatment pool. If the COD value measured by sampling after water distribution is less than the specified value of 1100 mg / L, it is necessary to add marigold production waste liquid to the biochemical treatment pool 5. The amount of marigold production waste liquid added to the biochemical treatment pool 5 needs to be calculated according to the influent COD load of the organic silicon wastewater. The amount of marigold production waste liquid added needs to ensure the ratio of biochemical BOD / COD in the organic silicon wastewater. The addition amount of waste liquid from marigold production is 0.3-0.5. The calculation method of the addition amount of waste liquid from marigold production is: the addition amount of waste liquid from marigold production = the total amount of COD to be supplemented / the COD content of marigold liquid; the total amount of COD to be supplemented = (the actual COD content of the influent COD of the organic silicon wastewater - the designed influent COD content of the organic silicon wastewater) * the influent amount of the biochemical system. After biochemical treatment, the removal rate of COD in the organic silicon wastewater reaches more than 50%, and the sludge lifting ratio SV30 in the biochemical treatment tank is maintained between 30% and 40%. ④ Sedimentation treatment: The organic silicon wastewater treated in step ③ is introduced into the sedimentation tank to achieve mud and water separation under the action of gravity. The organic silicon wastewater after mud and water separation is discharged for recycling, and the sludge is transported out for disposal.

[0013] In this embodiment 3, marigold flower production waste liquid is used to replace glucose. As a natural plant extract, marigold flower production waste liquid has good biocompatibility and environmental protection, and has a high COD value and total phosphorus. It is added to the organosilicon wastewater as a nutrient agent, which can not only maintain the BOD:COD of the organosilicon wastewater at 0.3-0.5, and improve the effect of the biochemical treatment of the organosilicon wastewater, but also replace glucose as a supplementer of the BOD value in the biochemical reaction of the organosilicon wastewater, which can not only reduce the purification cost of marigold production waste liquid, but also effectively reduce the nutrient solution supplement cost of the biochemical reaction. While achieving the coordinated disposal of marigold production waste liquid, it can also effectively improve the treatment effect of the organosilicon wastewater, and can make the average COD removal rate of the organosilicon wastewater after biochemical treatment 56.32%, and the sludge lifting ratio SV30 in the biochemical treatment tank 40%.

[0014] The test results of the above-mentioned embodiments 1 to 3 show that when marigold production waste liquid is added into the biochemical treatment pool 5, the marigold production waste liquid has no effect on the biochemical treatment operation of the organosilicon wastewater. The biochemical bacteria in the organosilicon wastewater have a strong adaptability to the marigold liquid and can replace glucose as a supplementary nutrient. Embodiments 1 to 3 use marigold production waste liquid instead of glucose, which can reduce the glucose consumption by about 3 tons per month, save 13,000 yuan in operating costs per month, and save 156,000 yuan per year.

[0015] Comparative Example 1 uses the same treatment method as Implementation 1 to treat organosilicon wastewater with the same component content. The treatment methods of organosilicon wastewater used in Comparative Example 1 and Implementation 1 are the same, with the difference that the supplement used in the biochemical treatment tank 5 in Comparative Example 1 is glucose, and the supplement used in the biochemical treatment tank 5 in Implementation 1 is marigold production waste liquid.

[0016] Comparative Example 2 uses the same treatment method as Implementation 2 to treat organosilicon wastewater with the same component content. The treatment methods of organosilicon wastewater used in Comparative Example 2 and Implementation 2 are the same, with the difference that the supplement used in the biochemical treatment tank 5 in Comparative Example 2 is glucose, and the supplement used in the biochemical treatment tank 5 in Implementation 2 is marigold production waste liquid.

[0017] Comparative Example 3 uses the same treatment method as Implementation 3 to treat organosilicon wastewater with the same component content. The treatment methods of organosilicon wastewater used in Comparative Example 3 and Implementation 3 are the same, with the difference that the supplement used in the biochemical treatment tank 5 of Comparative Example 3 is glucose, and the supplement used in the biochemical treatment tank 5 of Example 3 is marigold production waste liquid.

[0018] The test shows that the biochemical bacteria of Examples 1 to 3 in which glucose is added as a nutrient in the biochemical treatment tank 5 have good properties, the average COD removal rate after biochemical hydrolysis is greater than 50%, the SV30 sludge lift ratio SV30 after biochemical treatment can also be maintained between 30% and 40%, the biochemical flocculation and sedimentation effect is good, and there is no abnormality. However, under the same processing capacity as Examples 1 to 3, the monthly glucose consumption of Examples 1 to 3 is about 3 tons, and the monthly glucose use cost is about 13,000 to 15,000 yuan, and the operating cost is relatively high.

Claims

1. A method for co-disposing marigold squeezing wastewater using an organosilicon wastewater treatment system, characterized in that: The following steps are involved: ① Wastewater pretreatment: The organic silicon wastewater is introduced into a grease trap (1) for sedimentation to remove the scum and silicon powder precipitated at the bottom of the organic silicon wastewater. Then, the organic silicon wastewater in the grease trap (1) is introduced into an air flotation device (2) for air flotation removal to remove suspended impurities and silicone oil in the organic silicon wastewater. ② Evaporation and desalination: The organic silicon wastewater treated in step ① is evaporated using a steam circulation re-evaporator (3) to remove the salt in the organic silicon wastewater; ③ Biochemical treatment: introducing the organic silicon wastewater treated in step ② into a regulating tank (4), adjusting the pH value of the organic silicon wastewater to 6-9, adjusting the temperature of the organic silicon wastewater to 31-35° C., and adjusting the conductivity of the organic silicon wastewater to 2500-3500 us / cm, then introducing the organic silicon wastewater into a biochemical treatment tank (5), and simultaneously adding marigold production waste liquid into the biochemical treatment tank (5), wherein the BOD content of the marigold production waste liquid is 5000-6000 mg / L, and the COD content of the marigold production waste liquid is 50000-55000 mg / L, and the COD removal rate of the organic silicon wastewater after biochemical treatment reaches more than 50%; ④ Sedimentation treatment: The organic silicon wastewater treated in step ③ is introduced into a sedimentation tank (6) to separate mud and water under the action of gravity. The organic silicon wastewater after the separation of mud and water is discharged for recycling, and the sludge is transported out for disposal.

2. The method for co-disposing marigold squeezing wastewater using an organosilicon wastewater treatment system according to claim 1, characterized in that: In step ③, the marigold production waste liquid is the waste water generated during the fermentation, squeezing dehydration and extraction process of fresh marigold flowers.

3. The method for co-disposing marigold squeezing wastewater using an organosilicon wastewater treatment system according to claim 1, characterized in that: In step ③, after the organosilicon wastewater enters the biochemical treatment pool (5), it is necessary to take a sample to measure the COD value of the organosilicon wastewater. If the COD value measured by the sample is greater than the specified value of 1100 mg / L, there is no need to add marigold production waste liquid to the biochemical treatment pool (5). If the COD value measured by the sample after water distribution is less than the specified value of 1100 mg / L, it is necessary to add marigold production waste liquid to the biochemical treatment pool (5). The amount of marigold production waste liquid added to the biochemical treatment pool (5) needs to be calculated according to the influent COD load of the organosilicon wastewater. The amount of marigold production waste liquid added needs to ensure that the biochemical ratio BOD / COD ratio in the organosilicon wastewater is 0.3 to 0.

5.

4. The method for co-disposing marigold squeezing wastewater using an organosilicon wastewater treatment system according to claim 3, characterized in that: The calculation method for the dosage of marigold production waste liquid is: the dosage of marigold production waste liquid = the total amount of COD to be supplemented / the COD content of marigold liquid; the total amount of COD to be supplemented = (the actual influent COD content of silicone wastewater - the designed influent COD content of silicone wastewater) * the influent volume of biochemical system.

5. The method for co-disposing marigold squeezing wastewater using an organosilicon wastewater treatment system according to claim 1, characterized in that: In step ③, the sludge lift ratio SV30 in the biochemical treatment tank (5) is maintained between 30% and 40%.

6. The method for co-disposing marigold squeezing wastewater using an organosilicon wastewater treatment system according to claim 1, characterized in that: In step ①, the organic silicon wastewater after flotation treatment needs to be introduced into an oxidation pond (7), and then ferrous sulfide and hydrogen peroxide are added to the oxidation pond (7). After an oxidation reaction, the liquid silicone oil dissolved in the organic silicon wastewater is oxidized into solid silica gel, and then the organic silicon wastewater is filter-filtered to further remove the silicone oil dissolved in the wastewater.

7. The method for co-disposing marigold squeezing wastewater using an organosilicon wastewater treatment system according to claim 1, characterized in that: In step ②, the falling film evaporator temperature in the steam circulation re-evaporator (3) is controlled at 94-96°C, and the forced circulation evaporator temperature is controlled at 102-104°C.

8. The method for co-disposing marigold squeezing wastewater using an organosilicon wastewater treatment system according to claim 1, characterized in that: In step ①, the organic silicon wastewater entering the grease trap (1) mainly contains COD, Cl-, siloxane and SS, wherein the COD content is 7500-25000 mg / L, the Cl- content is 25000-50000 mg / L, the siloxane content is 7500-10000 mg / L, and the SS content is between 1500-2500 mg / L.

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