Method for reverse osmosis concentrated water by adsorption-regeneration circular treatment

A technology for reverse osmosis concentrated water and recycling treatment, applied in the direction of adsorbed water/sewage treatment, etc., can solve the problems of non-compliance with environmental protection, water-saving policies, increased production wastewater discharge, energy consumption and operating costs, and achieve automation The effect of control, small investment and low operating cost

Active Publication Date: 2013-07-24
CHINA NAT OFFSHORE OIL CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The concentrated water is discharged back to the front end of the sewage treatment system, and the pollutants will circulate and accumulate in the system, which will eventually lead to the reduction and deterioration of the system's treatment capacity, while the concentrated water is discharged directly or after dilution, which will cause serious secondary pollution or increase The discharge of production wastewater does not comply with the national environmental protection and water-saving policies
For the evaporation and drying of RO concentrated water, there are problems of high energy consumption and operating costs
At present, the effective treatment degree of RO concentrated water is still relatively low. It is urgent to develop an efficient, economical and reasonable process technology that can effectively remove residual organic pollutants in concentrated water.

Method used

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  • Method for reverse osmosis concentrated water by adsorption-regeneration circular treatment
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  • Method for reverse osmosis concentrated water by adsorption-regeneration circular treatment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Process treatment of RO concentrated water in the oil refining industry. The adsorbent in the adsorption tower adopts activated carbon, and its performance parameters are shown in Table 1:

[0020] Table 1 Performance parameters of activated carbon

[0021]

[0022] Table 2 Water quality changes before and after RO concentrated water treatment

[0023]

[0024] Activated carbon is used as an adsorbent to treat RO concentrated water in the oil refining industry. The operating condition is that the HRT is 20 minutes. The first cycle can stably treat 43 BV of RO concentrated water. The COD of the effluent is 37 mg / L, which meets the emission of COD≤50mg / L index. The saturated activated carbon is regenerated by electrochemical method, the voltage is 19 V, the current is 2.53-3.17 A, and the HRT is 6 h. After 10 cycles of adsorption-regeneration, the regeneration efficiency is above 88.4%. The experimental results show that COD, DOC, oil and other indicators in RO c...

Embodiment 2

[0026] Process treatment of RO concentrated water in the petrochemical industry. The adsorbent in the adsorption tower is modified fly ash, and its performance parameters are shown in Table 3:

[0027] Table 3 Performance parameters of modified fly ash

[0028]

[0029] Table 4 Water quality changes before and after RO concentrated water treatment

[0030]

[0031] Using modified fly ash as an adsorbent to treat RO concentrated water in the petrochemical industry, the operating condition is HRT of 60 min, the first cycle can stably treat 23 BV of RO concentrated water, the effluent COD is 48 mg / L, and COD≤50 mg / L emission index. The saturated modified fly ash is regenerated by electrochemical method, the voltage is 38 V, the current is 5.53-6.21 A, and the HRT is 2 h. After 10 cycles of adsorption-regeneration, the regeneration efficiency is above 73.9%. The experimental results show that after the modified fly ash adsorption-electrochemical regeneration process, the ...

Embodiment 3

[0033] Process treatment of RO concentrated water in the steel industry. The adsorbent in the adsorption tower is activated carbon fiber felt, and the water quality changes before and after treatment are shown in Table 5:

[0034] Table 5 Water quality changes before and after RO concentrated water treatment

[0035]

[0036] Activated carbon fiber is used as an adsorbent to treat RO concentrated water in the iron and steel industry. The operating condition is HRT of 30 minutes. The first cycle can stably treat RO concentrated water of 58 BV. The COD of the effluent is 37 mg / L, which meets the COD≤50 mg / L emission indicators. After saturation, the electrochemical method is used for regeneration, the voltage is 45 V, the current is 8. 21-9. 51 A, and the HRT is 0.5 h. After 12 cycles of adsorption-regeneration, 52 BV can still be treated up to the standard, and the regeneration efficiency is stable at 89.7% above. The experimental results show that after the activated car...

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Abstract

The invention discloses a method for reverse osmosis concentrated water by adsorption-regeneration circular treatment, belonging to the field of advanced wastewater treatment. An adsorption-regeneration combination treatment process is adopted, the advanced treatment problem of reverse osmosis concentrated water is solved, the COD (Chemical Oxygen Demand) of inlet water is 150-300mg / L, the COD of the outlet water is less than or equal to 50mg / L after treatment. According to the combination process, adsorption treatment is adopted as the main, an electrochemistry regeneration manner is adopted to recover the adsorption capacity on a saturation adsorption material, the adsorption-regeneration combination treatment process is realized, and the treatment cost of the reverse osmosis concentrated water is greatly reduced.

Description

technical field [0001] The invention belongs to the field of advanced sewage treatment, and is an adsorption-regeneration cycle treatment method for concentrated reverse osmosis water, especially a treatment method for removing residual dissolved organic pollutants in concentrated end water of reverse osmosis with the goal of discharge up to standard . Background technique [0002] Membrane separation technology is becoming an inevitable choice for the sustainable utilization of water resources, and has been widely used in industrial sewage treatment and reuse. During the actual operation of the reverse osmosis process for advanced wastewater treatment and reuse, about 70-75% of the dialysis water can be used for production and reuse, and about 25-30% of the reverse osmosis concentrated water is produced. The concentrated water contains a large amount of Most of the refractory organic pollutants and salts contained in the intercepted COD are around 150-300 mg / L, which canno...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28
Inventor 顾锡慧官赟赟雷太平滕厚开陈军张艳芳李立峰王昊
Owner CHINA NAT OFFSHORE OIL CORP
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