Semi-carbon wastewater treatment method

Abstract

The invention discloses a method for treating semi-coke wastewater. The pretreatment stage includes: the production wastewater is separated from oil and water through an oil-separating sedimentation tank, and then enters a regulating tank; Finally, the production wastewater enters the first intermediate pool; the production wastewater in the first intermediate pool is pumped to the filter system for filtration, the filtered filtrate enters the phenol extraction system, and the wastewater after extraction and dephenolization is pumped into the ammonia stripping tower to remove large Part of the free ammonia; the biochemical treatment stage includes: after the ammonia stripping tower removes most of the ammonia nitrogen, the production wastewater enters the hydrolysis and acidification tank after passing through the comprehensive adjustment tank, and the wastewater from the hydrolysis and acidification tank enters the HABR composite anaerobic baffle Reactor; then enter the A / O treatment system, add powdered activated carbon to the aerobic tank in the A / O treatment system, the wastewater comes out of the A / O treatment system and enters the sedimentation tank, and then passes through the third intermediate pool, aerated organisms Discharge up to the standard after the filter. The system is simple, low in cost, and can meet emission standards.

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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