A device for treating waste water in silicone sealant production
By combining equalization tanks, coagulation reaction tanks, air flotation machines, Fenton oxidation tanks, hydrolysis acidification tanks, and MBR membrane bioreactors, the problem of wastewater treatment in silicone sealant production was solved, achieving efficient removal of harmful substances and environmentally safe treatment results.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- LINQU JINDI RUBBER IND CO LTD
- Filing Date
- 2025-05-24
- Publication Date
- 2026-06-09
AI Technical Summary
Wastewater generated during the production of silicone sealants contains organosilicon compounds, VOCs, suspended solids, and heavy metals. Direct discharge of such wastewater can harm the environment and human health, and existing technologies are ineffective in treating it.
The treatment device employs a combination of equalization tank, coagulation reaction tank, air flotation machine, Fenton oxidation tank, hydrolysis acidification tank, MBR membrane bioreactor and sedimentation tank. It removes suspended solids, organic matter and heavy metals from wastewater through steps such as bar filtration, pH adjustment, coagulation reaction, air flotation, Fenton oxidation, hydrolysis acidification and membrane bioreactor.
The treated wastewater has a COD of less than 100 mg/L and a suspended solids of less than 30 mg/L, meeting national emission standards and ensuring environmental safety.
Smart Images
Figure CN224337403U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of chemical production equipment technology, specifically relating to a wastewater treatment device for silicone sealant production. Background Technology
[0002] The production of silicone sealant uses polydimethylsiloxane as the main raw material, supplemented with crosslinking agents, fillers, plasticizers, coupling agents, and catalysts, mixed under vacuum. Wastewater is inevitably generated during the production process. This wastewater mainly contains organosilicon compounds (such as silicone oil and silane coupling agents), VOCs (such as alcohols and ketones), suspended solids (filler particles), pH adjusters (acids / alkalis), and small amounts of other substances. Direct discharge without treatment will cause serious harm to the environment and human health. Therefore, it must be treated before discharge to ensure environmental safety. Summary of the Invention
[0003] The technical problem to be solved by this utility model is to provide a wastewater treatment device for silicone sealant production, which can solve the wastewater problem generated in silicone sealant production, with good treatment effect and ensure environmental safety.
[0004] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:
[0005] A wastewater treatment device for silicone sealant production includes an equalization tank, a coagulation reaction tank, an air flotation unit, a Fenton oxidation tank, a hydrolysis acidification tank, an MBR membrane bioreactor, and a sedimentation tank, which are connected sequentially by pipes, valves, and pumps. The outlet of the equalization tank is connected to the inlet of the coagulation reaction tank, the outlet of the coagulation reaction tank is connected to the inlet of the air flotation unit, the outlet of the air flotation unit is connected to the inlet of the Fenton oxidation tank, the outlet of the Fenton oxidation tank is connected to the inlet of the hydrolysis acidification tank, the outlet of the hydrolysis acidification tank is connected to the inlet of the MBR membrane bioreactor, and the outlet of the MBR membrane bioreactor is connected to the inlet of the sedimentation tank.
[0006] Preferably, the inlet of the regulating tank is equipped with a screen to isolate larger solid objects.
[0007] Preferably, a sodium hydroxide supply tank and a dilute sulfuric acid supply tank are provided above the equalization tank, and an online pH monitoring device is also provided inside the equalization tank. This allows the pH value of the wastewater to be adjusted to 6 to 9.
[0008] Preferably, a polyaluminum chloride supply tank and a polyacrylamide supply tank are provided above the coagulation reaction tank. These tanks can provide polyaluminum chloride (50-100 mg / L) and polyacrylamide (1-5 mg / L) to remove colloids and suspended solids.
[0009] Preferably, the dissolved air flotation machine is a DAF (Dissolved Air Flotation) machine. Its dissolved air pressure is 0.3-0.5 MPa, and its reflux ratio is 20-30%. It is used to remove suspended solids from emulsified oil and water.
[0010] Preferably, the process parameters of the Fenton oxidation tank are: H2O2 dosage 0.5-2 g / L, Fe 2 +:H2O2=1:5 (molar ratio), reaction pH=3-4, HRT=1-2h; used to degrade recalcitrant organosilicon and VOCs.
[0011] Preferably, the hydrolysis acidification tank is equipped with a submersible mixer. The process parameters are: HRT = 8-12h, pH = 6.5-7.5, which decomposes large organic molecules into smaller molecules.
[0012] Preferably, the process parameters of the MBR membrane bioreactor are: sludge concentration (MLSS) = 8000-12000 mg / L, membrane flux 10-15 L / (m³). 2 •h). It can achieve efficient solid-liquid separation and is used to remove biodegradable organic matter (such as alcohols and low-molecular-weight silicon compounds).
[0013] Preferably, the sedimentation tank is an inclined plate sedimentation tank, and a sodium sulfide supply tank is provided above the sedimentation tank for precipitating heavy metals. The outlet of the sedimentation tank is connected to the underground drainage network through a pipeline.
[0014] Due to the adoption of the above technical solution, the beneficial effects of this utility model are:
[0015] This invention utilizes a screen to separate larger solids, an equalization tank to adjust the pH of the wastewater to 6-9, a coagulation reactor to remove colloids and suspended solids, an air flotation unit to remove emulsified oil and suspended solids, a Fenton oxidation tank to degrade recalcitrant organosilicon and VOCs, a hydrolysis acidification tank to break down large organic molecules into smaller molecules, an MBR membrane bioreactor to remove biodegradable organic matter (such as alcohols and low-molecular-weight silicon compounds), and a sedimentation tank to precipitate heavy metals. Through this treatment process, the COD of the treated water is less than 100 mg / L, and the suspended solids are less than 30 mg / L, both below the national emission standards for this industry, ensuring effective treatment.
[0016] Therefore, this invention can solve the wastewater problem generated in the production of silicone sealant, with good treatment effect and ensure environmental safety. Attached Figure Description
[0017] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model;
[0018] The components include: 1. Equalization tank; 2. Coagulation reaction tank; 3. Air flotation machine; 4. Fenton oxidation tank; 5. Hydrolysis acidification tank; 6. MBR membrane bioreactor; 7. Sedimentation tank; 8. Bar screen; 9. Sodium hydroxide supply tank; 10. Dilute sulfuric acid supply tank; 11. Polyaluminum chloride supply tank; 12. Polyacrylamide supply tank; and 13. Sodium sulfide supply tank. Detailed Implementation
[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0020] like Figure 1 As shown, a wastewater treatment device for silicone sealant production includes an equalization tank 1, a coagulation reaction tank 2, an air flotation unit 3, a Fenton oxidation tank 4, a hydrolysis acidification tank 5, an MBR membrane bioreactor 6, and a sedimentation tank 7, which are connected in sequence via pipes (not shown), valves (not shown), and pumps (not shown). The outlet of the equalization tank 1 is connected to the inlet of the coagulation reaction tank 2, the outlet of the coagulation reaction tank 2 is connected to the inlet of the air flotation unit 3, the outlet of the air flotation unit 3 is connected to the inlet of the Fenton oxidation tank 4, the outlet of the Fenton oxidation tank 4 is connected to the inlet of the hydrolysis acidification tank 5, the outlet of the hydrolysis acidification tank 5 is connected to the inlet of the MBR membrane bioreactor 6, and the outlet of the MBR membrane bioreactor 6 is connected to the inlet of the sedimentation tank 7.
[0021] A screen 8 is installed at the inlet of the equalization tank 1. A sodium hydroxide supply tank 9 and a dilute sulfuric acid supply tank 10 are installed above the equalization tank 1. A polyaluminum chloride supply tank 11 and a polyacrylamide supply tank 12 are installed above the coagulation reaction tank 2. A sodium sulfide supply tank 13 is installed above the sedimentation tank 7.
[0022] In actual treatment, wastewater generated from each process in production is first transported to equalization tank 1 through collection pipelines. Larger solids are intercepted by a screen 8 installed at the inlet of equalization tank 1. Then, acid or alkali is added to equalization tank 1 to adjust the pH value to around 7. The wastewater is then transported to coagulation reaction tank 2 where polyaluminum chloride and polyacrylamide are added to coagulate and remove colloids and suspended solids. The wastewater is then transported to dissolved air flotation (DAF) machine 3 to treat emulsified oil or silicone oil in the wastewater. It is then transported to Fenton oxidation tank 4 to degrade recalcitrant organosilicon and VOCs in the wastewater. The wastewater is then decomposed into smaller molecules in hydrolysis acidification tank 5. Biodegradable organic matter (such as alcohols and low-molecular-weight silicon compounds) is removed in MBR membrane bioreactor 6. Finally, heavy metals are precipitated in sedimentation tank 7 (inclined plate sedimentation tank), thus completing the wastewater treatment process. The water flowing out of sedimentation tank 7 meets national discharge standards and can be connected to the underground drainage network for discharge. It is important to note during the treatment process that the Fenton sludge and heavy metal sludge are classified as hazardous waste (HW17 / HW22), and these sludges must be disposed of by a qualified unit.
[0023] It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.
Claims
1. A wastewater treatment device for silicone sealant production, characterized in that: The system includes an equalization tank, a coagulation reaction tank, an air flotation unit, a Fenton oxidation tank, a hydrolysis acidification tank, an MBR membrane bioreactor, and a sedimentation tank, which are connected sequentially by pipes, valves, and pumps. The outlet of the equalization tank is connected to the inlet of the coagulation reaction tank, the outlet of the coagulation reaction tank is connected to the inlet of the air flotation unit, the outlet of the air flotation unit is connected to the inlet of the Fenton oxidation tank, the outlet of the Fenton oxidation tank is connected to the inlet of the hydrolysis acidification tank, the outlet of the hydrolysis acidification tank is connected to the inlet of the MBR membrane bioreactor, and the outlet of the MBR membrane bioreactor is connected to the inlet of the sedimentation tank.
2. The wastewater treatment device for silicone sealant production as described in claim 1, characterized in that: A screen is installed at the inlet of the regulating tank.
3. The wastewater treatment device for silicone sealant production as described in claim 1, characterized in that: Above the regulating tank are a sodium hydroxide supply tank and a dilute sulfuric acid supply tank, and the regulating tank is also equipped with an online pH monitoring device.
4. The wastewater treatment device for silicone sealant production as described in claim 1, characterized in that: Above the coagulation reaction tank are a polyaluminum chloride supply tank and a polyacrylamide supply tank.
5. The wastewater treatment device for silicone sealant production as described in claim 1, characterized in that: The hydrolysis acidification tank is equipped with a submersible mixer.
6. The wastewater treatment device for silicone sealant production as described in claim 1, characterized in that: The sedimentation tank is an inclined plate sedimentation tank, and a sodium sulfide supply tank is located above the sedimentation tank.