A Coupling Process of Activated Carbon-Activated Sludge

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 ...

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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

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