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A Coupling Process of Activated Carbon-Activated Sludge

A technology of activated sludge and activated carbon, applied in water/sludge/sewage treatment, biological water/sewage treatment, sustainable biological treatment, etc. Long-term problems, to avoid waste of activated carbon, to facilitate sludge settlement, to reduce the effect of activated carbon loss

Active Publication Date: 2020-12-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in actual operation, the fouling problem of the pipeline of the WAR regeneration system is very serious, and the main locations are: the tube side of the cold feed of the heat exchanger and the feed tube of the heater
Pickling is used for scaling, the effect is not good, and it is difficult to heat up the heater and reactor
After dismantling and inspection, it was found that the heat exchanger and heater had hard scaling. After 3-4 days of operation, the thickness of the scale layer on the tube side of the heat exchanger could reach 12mm, which directly affected the heat exchange efficiency, and the regeneration rate of activated carbon gradually decreased.
In order to clean the scale in the heat exchanger, the device has to be cooled first, then rinsed with pickling and high-pressure water gun, and then heated up to the regeneration temperature. The whole cleaning process lasts for 3-4 days, with high cost and large action (heat exchanger dismantling, dismantling), long operation cycle, during the cleaning period, the sewage treatment system cannot be supplemented with regenerated carbon, which seriously affects the normal operation of the sewage treatment system, and the high-concentration acid produced during the cleaning process is also difficult to deal with, which increases the burden on the enterprise
[0006] In addition, the activated carbon regeneration unit is fouled and cannot operate normally, resulting in the remaining aged waste carbon sludge not being discharged from the biochemical system in time, seriously affecting the metabolism of microorganisms in the biochemical system, and restricting the treatment capacity of the sewage treatment system

Method used

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  • A Coupling Process of Activated Carbon-Activated Sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] This example is used to illustrate the activated carbon-activated sludge coupling process of the present invention.

[0067] (1) Sewage to be treated (COD is 700-1000mg / L, ammonia nitrogen is 30-40mg / L, sewage water temperature is 20-25°C) enters the activated sludge aeration tank for aeration treatment, and the hydraulic power of the sewage in the aeration tank The residence time is 20h;

[0068] (2) The effluent from the aeration tank enters the activated carbon dosing system, and after being exhausted by the exhaust device, the COD value detected by the COD detection device is 71mg / L. The adsorption test was carried out on the effluent of the aeration tank, and 100mg of activated carbon adsorbed 42mg of COD, so the coefficient k=2.4. According to the relationship m=k×(n-50), relative to the effluent from the aeration tank, the activated carbon dosing device adds 50mg / L of activated carbon, and the activated carbon and the effluent from the aeration tank are mixed ev...

Embodiment 2

[0074] This example is used to illustrate the activated carbon-activated sludge coupling process of the present invention.

[0075] (1) Sewage to be treated (COD is 700-1000mg / L, ammonia nitrogen is 30-40mg / L, sewage water temperature is 20-25°C) enters the activated sludge aeration tank for aeration treatment, and the hydraulic power of the sewage in the aeration tank The residence time is 12h;

[0076] (2) The effluent from the aeration tank enters the activated carbon dosing system, and after being exhausted by the exhaust device, the COD value detected by the COD detection device is 75mg / L. The adsorption test was carried out on the effluent of the aeration tank, and 100mg of activated carbon adsorbed 31mg of COD, so the coefficient k=3.2. According to the relationship m=k×(n-50), relative to the effluent of the aeration tank, the activated carbon dosing device adds 80 mg / L of activated carbon, and the activated carbon and the effluent of the aeration tank are mixed evenl...

Embodiment 3

[0081] This example is used to illustrate the activated carbon-activated sludge coupling process of the present invention.

[0082] (1) Sewage to be treated (COD is 700-1000mg / L, ammonia nitrogen is 30-40mg / L, sewage water temperature is 20-25°C) enters the activated sludge aeration tank for aeration treatment, and the hydraulic power of the sewage in the aeration tank The residence time is 8h;

[0083] (2) The effluent from the aeration tank enters the activated carbon dosing system, and after being exhausted by the exhaust device, the COD value detected by the COD detection device is 65mg / L. The adsorption test was carried out on the effluent of the aeration tank, and 100mg of activated carbon adsorbed 21mg of COD, so the coefficient k=4.8. According to the relationship m=k×(n-50), relative to the effluent of the aeration tank, the activated carbon dosing device adds 72mg / L of activated carbon, and the activated carbon and the effluent of the aeration tank are mixed evenly ...

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Abstract

The invention discloses an active carbon-activated sludge coupling process, belonging to field of sewage treatment. The process comprises the following steps that: (1) sewage enters a biochemical system for biochemical treatment; (2) effluent of the biochemical system enters an active carbon feeding system for mixing with active carbon; (3) effluent of the active carbon feeding system enters a separating system for settlement and separation so as to obtain supernatant and bottom waste carbon mud, the supernatant is discharged as treatment effluent, a part of the bottom waste carbon mud is returned to the biochemical system, another part of the bottom waste carbon mud enters a regeneration system for regeneration of active carbon, and the rest bottom waste carbon mud is discharged after dehydration; and (4) effluent of the regeneration system enters the biochemical system. The active carbon-activated sludge coupling process provided by the invention is small in the feeding amount of active carbon, low in operation cost and high in effluent quality, and can reduce the possibility of swelling of activated sludge.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to an activated carbon-activated sludge coupling process. Background technique [0002] The activated carbon-activated sludge coupling process is a sewage treatment process in which powdered activated carbon is added to the activated sludge aeration tank to form a composite bioreactor. This technology originated in the United States in the 1970s. Its process is characterized by activated carbon particles wrapped in activated sludge flocs. Through the organic combination of activated carbon adsorption and biodegradation, the purification function of activated sludge flocs is strengthened and the treatment of the system is improved. ability. The main function of this process is to convert suspended, colloidal and soluble pollutants into degradable powdered activated carbon biocolloids, promote sludge settlement, and increase the removal rate of dissolved organic matter, chroma, toxic ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/12C02F3/28
CPCY02W10/10
Inventor 张超马欣曹晓磊
Owner CHINA PETROLEUM & CHEM CORP
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