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Reverse osmosis concentrated wastewater treatment method

A technology for reverse osmosis concentration and wastewater treatment, which is applied in water/sewage treatment, water/sewage multi-stage treatment, oxidized water/sewage treatment, etc. It can solve the problems of high treatment cost and unsatisfactory treatment effect, and reduce the COD value. , the treatment effect is remarkable, the effect of developed pores

Active Publication Date: 2013-03-27
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] To sum up, the current reverse osmosis concentrated water treatment process has unsatisfactory treatment effects and high treatment costs.

Method used

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  • Reverse osmosis concentrated wastewater treatment method
  • Reverse osmosis concentrated wastewater treatment method
  • Reverse osmosis concentrated wastewater treatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Concentrated water (COD 365mg / L, pH 7.9) from a reverse osmosis unit enters figure 1 In the process flow shown, the main process parameters of each processing unit are:

[0049] The reverse osmosis concentrated water is added acid in the concentrated water storage tank to adjust the pH value to 2.2, and then enters the catalytic oxidation electrolysis device. The treatment capacity of the electrolysis device is 10L / h, and the high-activity catalyst filled particles added account for about 45% of the volume of the electrolysis device. , both the cathode and the anode use stainless steel mesh as the working electrode, keep the distance between the plates at 10cm, and the electrolysis time is 60min. When the plate voltage is 5V and the current density is 6mA / cm 2 1. When the current intensity is 40mA, the final effluent COD is 55mg / L, the pH value is 2.0, and the COD removal rate reaches 85%. NaOH is added to the catalytic electrolysis water to adjust the pH value to 6.8,...

Embodiment 2

[0051] Concentrated water (COD 134mg / L, pH 6.5) from a reverse osmosis unit enters figure 1 In the process flow shown, the main process parameters of each processing unit are:

[0052] The reverse osmosis concentrated water is added acid in the concentrated water storage tank to adjust the pH value to 4.0 and then enters the catalytic oxidation electrolysis device. The treatment capacity of the electrolysis device is 12L / h, and the high-activity catalyst filled particles added account for about 50% of the volume of the electrolysis device. %, the cathode is made of stainless steel plate, the anode is made of graphite electrode as the working electrode, the distance between the plates is kept at 6cm, the electrolysis time is 30min, when the plate voltage is 6V and the current density is 3mA / cm 2 , When the current intensity is 1A, the final effluent COD is 40mg / L, the pH value is 2.85, and the COD removal rate reaches 70%. NaOH is added to the catalytic electrolysis water to a...

Embodiment 3

[0054] Concentrated water (COD 95mg / L, pH 8.2) from a reverse osmosis unit enters figure 1 In the process flow shown, the main process parameters of each processing unit are:

[0055] The reverse osmosis concentrated water is added acid in the concentrated water storage tank to adjust the pH value to 3.2, and then enters the catalytic oxidation electrolysis device. The treatment capacity of the electrolysis device is 8L / h, and the high-activity catalyst filled particles added account for about 30% of the volume of the electrolysis device. %, both the cathode and the anode use stainless steel plates as the working electrodes, keep the distance between the plates at 8cm, and the electrolysis time is 40min. When the plate voltage is 6V and the current density is 1.6mA / cm 2 , When the current intensity is 1.25A, the final effluent COD is 35mg / L, the pH value is 3.07, and the COD removal rate reaches 63%. NaOH is added to the catalytic electrolysis water to adjust the pH value to ...

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Abstract

The invention relates to a reverse osmosis concentrated wastewater treatment method, belongs to the wastewater treatment, and especially relates to electrochemical water treatment. Electric energy is adopted as excitation energy, a three-dimensional catalytic oxidation electrolysis treatment device is adopted, the three-dimensional catalytic oxidation electrolysis treatment device comprises a cathode plate and an anode plate, electrode-catalyst particles are filled between the cathode plate and the anode plate, and an air blowing process is adopted to activate a cathode. The reverse osmosis concentrated wastewater treatment method has the advantages of decrease of the content of COD in treated wastewater to below 60mg / L, simple flow, less electricity consumption, low cost, and wide use, and is suitable for treating reverse osmosis concentrated water discharged in a standard exceeding manner and generated in the reclaimed water reuse process of various wastewaters, and other wastewaters which are difficult to degrade. Water discharged after the reverse osmosis concentrated wastewater treatment can reach the discharging standard that the COD content is not greater than 60mg / L, so the method is a new approach for the reverse osmosis concentrated water treatment; and the method has the characteristics of environmental protection and no secondary pollution.

Description

technical field [0001] The invention relates to a reverse osmosis concentrated wastewater treatment method, which belongs to wastewater treatment, and in particular relates to electrochemical water treatment. Background technique [0002] In recent years, with the improvement of the quality of the reverse osmosis membrane and the continuous reduction of the price, the reverse osmosis technology has developed rapidly. Because of its characteristics of no phase change of materials, low energy consumption, simple equipment, high degree of automation, and easy operation and management, it has been It is widely used in various fields of the national economy, especially in the field of waste water and sewage reuse treatment. [0003] The influent water of the reverse osmosis process is mostly brackish water after biochemical treatment or poor water quality. While desalination is used to make recycled water, impurities in the influent water are highly concentrated, resulting in one...

Claims

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Application Information

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IPC IPC(8): C02F9/06C02F1/461C02F1/72
Inventor 邹宗海潘咸峰刘婷婷王建娜黄斌
Owner CHINA PETROLEUM & CHEM CORP
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