Treatment method of organic silicon production wastewater

A technology for the production of wastewater and treatment methods, applied in the direction of sedimentation treatment, multi-stage water treatment, water/sewage treatment, etc., can solve the problems of ozone depletion, difficult to reach water, and difficult to crack siloxane, so as to reduce investment cost and operation Cost, reduction of COD value, effect of reduction of ozone consumption

Inactive Publication Date: 2020-04-10
JIANGSU LASON CHEM ENVIRONMENTAL PROTECTION
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

3. Characteristics of organic pollutants The pollutants have obvious properties and contain silicon elements. Among them, the silicon-oxygen bond energy is large, and it is difficult to break the chain of biodegradation. It always exists in the water body and cannot be completely degraded. If the silicon element in organic silicon is not completely degraded , there will be a higher COD value in the wastewater, making it difficult for the effluent to reach COD≤60mg / L
Due to the relatively high concentration of non-biodegradable organic silicon components in the raw wastewater, especially the structure of siloxane is more stable than other organic substances, and silicon oxygen is difficult to break, the amount of ozone in the first stage is difficult to achieve the cracking of siloxane, and the second Due to the high chlorine in the water, the ozone free radicals will be annihilated, and the siloxane in the wastewater will always exist in the water body, which will consume more ozone. Based on the above factors, it is difficult to stably achieve COD≤60mg / L

Method used

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  • Treatment method of organic silicon production wastewater

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Effect test

Embodiment 1

[0033] The process flow chart of the treatment method of the present invention's treatment of organic silicon production wastewater is as figure 1 As shown, pass the organic silicon production wastewater into the air flotation tank, remove the slick oil in the wastewater, add sodium hydroxide to adjust the pH to 3, and add 14g of 2% ferrous sulfate solution and 5g of 27.5% hydrogen peroxide per liter of air flotation water , carry out the Fenton oxidation reaction, the reaction time is 2h; add sodium hydroxide to the obtained wastewater to adjust the pH to be greater than 7, then add a coagulant, add 5 mg of coagulant to every 1L of wastewater, pass it into the coagulation sedimentation tank, and discharge the supernatant, The sludge is transported outside for disposal, and the supernatant is passed into a three-effect evaporation to remove salt by evaporation. The residual liquid of the evaporation kettle is used as hazardous solid waste and sent to the hazardous waste disposa...

Embodiment 2

[0037]Pass organic silicon production wastewater into the air flotation tank, remove the slick oil in the wastewater, add sodium hydroxide to adjust the pH to 4, add 10g of 8% ferrous sulfate solution and 8g of 27.5% hydrogen peroxide per liter of air flotation water, and carry out fen Oxidation reaction, the reaction time is 4 hours; the obtained wastewater is adjusted to a pH greater than 7 by adding sodium hydroxide, and a coagulant is added, and 5mg of a coagulant is added to each 1L of wastewater, which is passed into the coagulation sedimentation tank, the supernatant is discharged, and the sludge is separated. For external disposal, the supernatant is passed into the second-effect evaporation to remove salt, and the residual liquid of the evaporation kettle is used as hazardous solid waste and sent to the hazardous waste disposal center. The evaporative condensate is passed into the biochemical water inlet pool, the water temperature is controlled at 25°C and activated s...

Embodiment 3

[0041] The processing step of this implementation 3 is roughly the same as that of Example 2, and the difference is that the present Example 3 does not adopt Fenton and evaporation pretreatment, and the specific result data are as shown in Table 3:

[0042] table 3

[0043] index raw water air flotation A-O biochemistry Ozone oxidation COD 2500 2250 450 250 Inorganic silicon 18 18 28 108 Silicone 230 215 200 120 total silicon 250 230 230 230

[0044] In conjunction with Table 2 and Table 3, it can be concluded that the air flotation-Fenton oxidation pretreatment process of the present invention can degrade biodegradable substances in wastewater, greatly reduce the COD value, and leave refractory organic silicon and siloxane and other organic matter. Among them, air flotation removes oil slicks in wastewater, and after recycling, it returns to the production process for reuse. The Fenton oxidation process modifies waste...

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Abstract

The invention discloses a treatment method of organic silicon production wastewater. The treatment method comprises the following steps: introducing organic silicon wastewater into an air floatation process, removing the floating oil in the wastewater, collecting the floating oil, returning to a production recovery process so as to be treated, introducing air floatation effluent into a pH regulating tank, regulating the pH value to 3-4, introducing into a Fenton oxidation tank, adding a ferrous sulfate solution and hydrogen peroxide, and carrying out a Fenton oxidation reaction; introducing the wastewater after Fenton oxidation into multi-effect evaporation, evaporating to remove the salt, pumping the evaporation condensate into a biochemical system, and carrying out biodegradation on theorganic matters in the wastewater by using an active sludge method and adopting facultative anaerobic hydrolysis and continuous aerobic treatment processes; and externally transporting the residual sludge, carrying out mud-water separation on biochemical aerobic effluent, carrying out hydrogen peroxide-ozone coupling oxidation on the supernatant to finally achieve the COD of smaller than or equalto 60 mg/L.

Description

technical field [0001] The invention belongs to the field of sewage treatment, in particular to a method for treating organic silicon wastewater. Background technique [0002] Organosilicon monomers and downstream products of organosilicon. The wastewater produced by organosilicon mainly contains methanol, methyl chloride, organohalosilane, high polymer silicone oil, silicone resin, silicone rubber, silicon intermediates and other substances. The water contains a large amount of chloride ions. Poor biodegradability. The main process principle of organosilicon production in the prior art is as follows: synthesis of monochloromethane - synthesis of dimethyldichlorosilane monomer - hydrolysis of dimethyl monomer - cracking and rectification of siloxane. From the perspective of the entire production process, the production of organic silicon uses methanol, hydrogen chloride and silicon powder as raw materials, and zinc, copper, etc. as catalysts. However, there is no chlorine ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F101/30
CPCC02F9/00C02F1/24C02F1/66C02F1/722C02F2305/026C02F1/5236C02F1/56C02F1/04C02F2001/007C02F3/30C02F2101/30C02F1/78C02F1/40C02F2301/08
Inventor 高峰高映海李琳蔡凯王蔡华蒋伟群
Owner JIANGSU LASON CHEM ENVIRONMENTAL PROTECTION
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