Semi-coke wastewater treatment method

Abstract

The invention discloses a semi-coke wastewater treatment method. A pretreatment process comprises the following steps: production wastewater goes through an oil separation sedimentation tank and undergoes oil-water separation, and obtained wastewater enters an equalization pool; the production wastewater in the equalization pool is pumped to a coagulation and air floatation machine and undergoes air floatation separation, and obtained production wastewater enters a first intermediate water pool; and production wastewater in the first intermediate water pool is pumped to a filtering system and is filtered, the obtained filtrate enters a phenol extraction system, and phenol extraction removed wastewater is pumped into an ammonia stripping tower in order to remove most free ammonia. A biochemical treatment process comprises the following steps: production wastewater obtained after removal of most of ammonia nitrogen through the ammonia stripping tower goes through a comprehensive equalization pool, obtained wastewater enters a hydrolysis-acidification pool, and wastewater from the hydrolysis-acidification pool enters an HABR compound anaerobic baffled reactor; and obtained wastewater enters an A / O treatment system, powdered active carbon is added to an aerobic tank in the A / O treatment system, wastewater discharged from the A / O treatment system enters a sedimentation tank, wastewater from the sedimentation tank goes through a third intermediate water pool, wastewater from the third intermediate water pool goes through an aeration bio-filter, and water discharged from the aeration bio-filter, reaching discharge standards, is discharged. The system has the advantages of simplicity, low cost and standard reaching discharge realization.

Description

technical field [0001] The invention relates to a wastewater treatment method, in particular to a semi-coke wastewater treatment method. Background technique [0002] According to the different investment and production methods of the coking industry, coking wastewater can be divided into two types: metallurgical coke wastewater with light pollution, namely coke wastewater, and semi-coke wastewater with serious pollution, namely semi-coke wastewater. [0003] Semi-coke wastewater is the wastewater produced during the process of coal semi-coke products and coke quenching, mainly containing coal tar substances, such as methanol, ethanol, formic acid, acetic acid, benzene, toluene, xylene, trimethylbenzene, phenols, naphthalene , anthracene, quinone and other coal tar-based substances, but also contains a large number of ring-chain organic compounds, azide inorganic compounds and ammonia nitrogen. Since semi-coke is a semi-coke product, its wastewater quality composition is si...

AI Technical Summary

Problems solved by technology

[0006] 1) High oil content: The oil content in semi-coke production wastewater is high, sometimes as high as 2500mg / L, and a large number of pollutants are dissolved in the oil

[0007] 2) The phenol content in wastewater with high phenol content is as high as 2660mg / L

[0008] 3) High content of ammonia nitrogen

High concentrations of ammonia are not only difficult to remove by biochemical methods, but also have a certain toxic effect on biochemical treatment microorganisms. In severe cases, it can kill activated sludge and destroy the entire biological treatment system.

[0010] 4) High content of refractory organic matter

[0011] The semi-coke production wastewater contains a large amount of benzene, naphthalene and heterocyclic refractory organic matter, and it is difficult to directly treat it to the standard by the usual aerobic activated sludge method

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