Denitrification device for coking wastewater mixed liquid and method for improving denitrification ability of coking wastewater

Abstract

The invention provides a denitrification device for coking wastewater mixed liquid and a method for improving denitrification ability of coking wastewater. The device comprises an anaerobic tank, an anoxic tank, an aerobic tank and a settling tank which communicate with one another successively, wherein a good carbon source case and a carbon-source-free case are arranged in the anoxic tank; the good carbon source case is arranged at a water outlet end of the anoxic tank; the carbon-source-free case is arranged at a raw water and mixed liquid inlet end of the anoxic tank; and the good carbon source case is in half isolation from the carbon-source-free case. The denitrification device has the beneficial effects that the total nitrogen of water drained from an A / O system is greatly reduced, treatment load of rear denitrification is greatly reduced, therefore, reaction retention time of rear denitrification is reduced, and the investment and the running cost are reduced; and meanwhile, alkalinity produced by high denitrification efficiency is improved, consumption of alkali liquor for nitrification of an aerator tank can be reduced, the running cost of the aerator tank is reduced, and therefore, the denitrification device is dual-purpose.

Description

technical field [0001] The present invention mainly aims at the weak denitrification ability of the anoxic stage in the mixed liquid reflux form of the coking wastewater in the A / O or A / A / O process, and improves the process to enhance the denitrification ability. Background technique [0002] At present, the biochemical treatment process of coking wastewater is mostly A / O (anoxic plus aerobic) or A / A / O (anaerobic plus anoxic plus aerobic). Anaerobic biochemical treatment is carried out on difficult-to-biochemically-treated and toxic organic matter to achieve the effect of opening the chain to improve biodegradability and reduce toxicity. The main function of the aerobic section is to remove organic matter and ammonia nitrogen in the wastewater, in which the ammonia nitrogen is converted into nitrate nitrogen, which is refluxed with the effluent (mud-water mixture and or supernatant after precipitation) according to a certain reflux ratio (generally 3 times) to the The anoxi...

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Problems solved by technology

The above two reasons are caused by the characteristics of the mixed liquid reflux process and cannot be changed temporarily.

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