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Epoxy chloropropane wastewater treatment method

A technology of epichlorohydrin and a treatment method, which is applied in the field of wastewater treatment, can solve the problem of high comprehensive treatment cost, and achieve the effects of low cost, high treatment efficiency and simple process

Pending Publication Date: 2021-09-07
山东产研生态环境研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the activated carbon of this process can be regenerated after adsorbing epichlorohydrin, VOC organic waste gas will be generated during the regeneration process, and the activated carbon will contain epichlorohydrin after deactivation. As a hazardous waste treatment, the comprehensive treatment cost is relatively high.

Method used

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  • Epoxy chloropropane wastewater treatment method
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  • Epoxy chloropropane wastewater treatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] see figure 1 , the concentration of epichlorohydrin wastewater is 1500mg / L, the water temperature is 45°C, the pH value is 6.8, and the wastewater flow rate is 2.5m 3 / h, the salt content of wastewater is 2%.

[0069] Directly adopt the biochemical system of the present invention to carry out wastewater treatment, first dilute the COD concentration of the wastewater to 500mg / L, cultivate for 7 days, then raise the COD concentration to 1500mg / L, pass it into the honeycomb fixed bed bioreactor 3, biochemical pool The bottom is connected to Roots blower 4 for aeration, the biochemical residence time is 18h, and the COD of water and wastewater is 89mg / L after detection.

Embodiment 2

[0071] The COD concentration of epichlorohydrin wastewater is 6500mg / L, the water temperature is 30°C, the pH value is 7.0, and the wastewater flow rate is 1m 3 / h, the salt content of wastewater is 1.8%.

[0072] First use ozone to carry out catalytic oxidation of wastewater, the amount of ozone in the ozone generator 1 is 1-3.2kg / h, and the ozone concentration is 100mg / m 3 , ozone is passed into the catalytic oxidation tower 2 to catalyze the oxidation of wastewater, and the top of the catalytic oxidation tower 2 is provided with an ozone digester 5. After testing, the COD concentration of the wastewater at the outlet of the catalytic oxidation tower is 3200mg / L.

[0073] The COD concentration of the wastewater at the outlet of the catalytic oxidation tower is first diluted to 500 mg / L, and then enters the honeycomb fixed-bed bioreactor 3 for cultivation for 7 days, and the bottom of the biochemical pool is connected to the Roots blower 4 for aeration. Then adjust the conce...

Embodiment 3

[0075] The COD concentration of epichlorohydrin wastewater is 15000mg / L, the water temperature is 25°C, the pH value is 7.6, and the wastewater flow rate is 2m 3 / h, the salt content of wastewater is 1.8%.

[0076] First, ozone is used to catalyze the oxidation of wastewater. The amount of ozone used in the ozone generator 1 is 9.0kg / h, and the ozone concentration is 120mg / m 3 , ozone passes into the catalytic oxidation tower 2 to catalyze the oxidation of waste water, and the top of the catalytic oxidation tower 2 is provided with an ozone digester 5, and the COD outlet concentration is 8750 mg / L after testing.

[0077] The size of the biochemical reaction pool is 10.0(L)*1.0(W)*2.2m(H). There are 8 cells in total, and the 8 biochemical pools are connected in sequence. Each biochemical pool unit forms different types of biological flora.

[0078] The COD concentration of the wastewater at the outlet of the ozone catalytic reactor is first diluted to 1000mg / L and entered int...

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Abstract

The invention relates to an epoxy chloropropane wastewater treatment method which comprises the following steps: 1, introducing epoxy chloropropane wastewater into an ozone catalytic oxidation tower, filling a catalyst in the catalytic oxidation tower, and carrying out catalytic oxidation decomposition on the epoxy chloropropane wastewater to obtain small molecule and biochemical organic matters; and 2, the oxidized epoxy chloropropane wastewater enters a biochemical pool for biochemical decomposition, and the treated epoxy chloropropane wastewater reaches the standard and is discharged. The biological bacteria culture mode in the biochemical pool adopts a gradual slow culture mode, firstly, COD (Chemical Oxygen Demand) of the wastewater is diluted to 500mg / l by adding water, the wastewater is cultured for 5-14 days, then the COD concentration of the wastewater is gradually increased, and the culture is continued. If the COD concentration of the epoxy chloropropane wastewater is higher than 8000 ppm, the wastewater is firstly subjected to ozone catalytic oxidation, then a middle unit of the honeycomb type fixed bed bioreactor is set as a catalytic oxidation regulating water tank, and the wastewater is conveyed to a catalytic oxidation tower through a pump for secondary oxidation. The wastewater treatment efficiency is improved, and the treatment cost is reduced.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a method for treating epichlorohydrin wastewater. Background technique [0002] Epichlorohydrin has a large market demand and high product price, and is mainly used in the production of epoxy resin, polyether polyol, epichlorohydrin rubber and other products. According to the data of Longzhong Petrochemical, the output of epichlorohydrin in my country in 2019 was 624,700 tons, and the apparent consumption was 743,800 tons. Therefore, there is a supply and demand gap of 129,100 tons of epichlorohydrin in my country. However, the concentration of residual organic matter in the sewage discharged from the production of epichlorohydrin is relatively high, and the wastewater index changes greatly: COD can reach 15000-40000mg / L; TDS can reach 250000-300000mg / L; pH is about 8-10, and wastewater treatment It is more difficult. [0003] The organic substances remaining in ep...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F101/30
CPCC02F1/78C02F1/725C02F3/02C02F2101/30
Inventor 蔡连国卞卫国李壮壮杜森
Owner 山东产研生态环境研究院有限公司
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