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Treatment of wastewater from vitamin C production with reinforcement, catalysis and ozonization of physical means

A physical method, a technology for producing wastewater, applied in the directions of oxidized water/sewage treatment, natural water treatment, chemical instruments and methods, etc., can solve the problems of high operating cost, difficult industrial application, low ozone utilization rate, etc., to reduce COD and Effect of hardness, operating cost reduction, oxygen consumption reduction

Active Publication Date: 2009-05-13
溧阳常大技术转移中心有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the problem is that the ozone utilization rate is low and the operating cost is high
[0007] In short, the current multi-stage biochemical method cannot deeply degrade VC wastewater, so that the COD of the effluent is less than 80mg / L
The cost of chemical treatment is high and it is difficult for industrial application

Method used

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  • Treatment of wastewater from vitamin C production with reinforcement, catalysis and ozonization of physical means
  • Treatment of wastewater from vitamin C production with reinforcement, catalysis and ozonization of physical means
  • Treatment of wastewater from vitamin C production with reinforcement, catalysis and ozonization of physical means

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] use figure 2 The shown ultraviolet light enhanced ozonation treatment device has an effective volume of a 2.5L bubble column reactor, and a UV light source 6 with a power of 14W and a wavelength of 290nm is placed in the inner sleeve of the oxidation reactor 9 (irradiation power is equivalent to 5.6 W / L reactor). with TiO 2 (20%)-SiO 2 (80%) The solid particle of the composite is the catalyst, the loading amount of the catalyst is 15g, and the particle size is 80-120 mesh. The reaction temperature was controlled at 75°C.

[0032] VC wastewater is taken from the effluent of the three sedimentation tanks of Jiangsu Jiangshan Pharmaceutical Co., Ltd., COD cr : 289mg / l, chromaticity: 140 times, calcium ion concentration 1080mg / l. The feed rate of VC wastewater is 10 L / h, and the residence time of VC wastewater in the oxidation reactor 9 is 15 minutes.

[0033] Adjust the oxygen flow rate of the oxygen / air flow meter 3 to be 12L / h, and observe through the tail gas ozo...

Embodiment 2

[0035] Change the source of VC wastewater and use wastewater from the VC production workshop, which is reddish brown, with a chroma greater than 450, and COD Cr The value is 11270mg / l, and it has a pungent taste. Ca ion 52mg / L.

[0036] Using the same device and the same catalyst as in Example 1. The reaction temperature was controlled at 75°C. The feeding rate of VC wastewater is 2.5 L / h, and the residence time of VC wastewater in the oxidation reactor 9 is 60 min.

[0037] Adjust the oxygen flow rate of the oxygen / air flow meter 3 to 15.5L / h, and observe through the tail gas ozone indicator so that the tail gas ozone content does not exceed 2.5mg / L. COD of effluent cr Value 91.4mg / L, COD removal rate 99%; effluent chroma 10, odorless, Ca ion 28.7mg / L.

Embodiment 3

[0039] The reaction temperature was controlled at 85°C. The feeding rate of VC wastewater is 2.0 L / h, and the residence time of VC wastewater in the oxidation reactor 9 is 75 minutes. All the other are with embodiment 2. COD of effluent cr The COD removal rate is 72.8mg / L, and the COD removal rate is 99.4%; the effluent is colorless and odorless, and the Ca ion is 26.2mg / L.

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Abstract

The invention discloses a physical method for treating vitamin C production wastewater by strengthening and catalyzing ozonization. Ultrasonic radiation, ultraviolet irradiation and hydrodynamic cavitation methods are adopted to be combined with a chemical method for heterogeneously catalyzing the oxidation of ozone respectively to ensure that organic matters in vitamin C wastewater are oxidized and degraded into CO2, and the generated CO2 makes Ca ions in the wastewater precipitated. Compared with single heterogeneous catalysis to the oxidation of the ozone, the utilization rate of the ozone of the method is improved by 1.3 to 4 times, and oxygen consumption and operating cost are remarkably reduced; the COD value of output water can be less than 80mg / L, the decolorization ratio reaches 100 percent, the output water has no peculiar smell, the total hardness removal rate is more than 90 percent, and the removal rate of the organic matters is more than 95 percent; and the method has no secondary pollution, and the treated VC wastewater can reach the national grade one discharge standard or is used as process water for recycling.

Description

technical field [0001] The invention belongs to the field of waste water treatment, and in particular relates to a treatment technology for strengthening catalytic ozonation process and degrading vitamin C (Vitamine C, hereinafter referred to as VC) production waste water by using a physical method. Background technique [0002] VC wastewater is the wastewater generated during the VC production process, including high-concentration wastewater discharged from production workshops and low-concentration wastewater discharged from resin treatment. In actual industry, 150-200 tons of waste water is produced for every ton of VC produced. China currently produces more than 100,000 tons of VC annually, so the VC industry discharges about 20 million tons of waste water every year. The main components of VC wastewater are VC, gulong acid, sorbitol, methanol, polymerized sugars, protein, calcium ions, etc. The wastewater has the characteristics of high salt, high COD, high hardness, e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/08C02F1/78C02F1/36C02F1/32C02F103/36
Inventor 单玉华邓俊辉李定龙唐兆吉李书侠
Owner 溧阳常大技术转移中心有限公司
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