Coal Chemical Wastewater Treatment Process

Abstract

The invention discloses a treatment process of coal chemical sewage. The treatment process comprises the steps that the coal chemical sewage is introduced into a gas floatation clarifier for gas floatation treatment; the coal chemical sewage is made to flow into a reaction pool for oxidation treatment; the coal chemical sewage is made to flow into a hydrolysis acidification pool for hydrolytic acidification treatment; the coal chemical sewage is made to flow into an anoxic pool for anaerobic treatment; the coal chemical sewage is made to equivalently flow into a first aerobiotic pool, a second aerobiotic pool, a third aerobiotic pool and a third aerobiotic pool for aerobic treatment, wherein the oxygen concentration of the coal chemical sewage in the first aerobiotic pool is controlled to be 1-2 mg / L, the oxygen concentration of the coal chemical sewage in the second aerobiotic pool is controlled to be 2-3 mg / L, the oxygen concentration of the coal chemical sewage in the third aerobiotic pool is controlled to be 3-4 mg / L, and the oxygen concentration of the coal chemical sewage in the fourth aerobiotic pool is controlled to be 4-6 mg / L; the coal chemical sewage flows into a settling pool for sedimentation treatment. Photo-catalytic oxidation and ozonation are utilized, so that the difficulty of subsequent anoxic-aerobiotic biochemical treatment is reduced, treatment time is shortened, and energy consumption is reduced.

Description

Technical field

[0001] The invention relates to a chemical wastewater treatment method, in particular to a coal chemical wastewater treatment process. Background technique

[0002] Coal chemical wastewater is a kind of industrial wastewater containing refractory organic compounds. The organic pollutants in the wastewater are complex, including phenols, alkanes, aromatic hydrocarbons, cyanogens, heterocyclics, and ammonia nitrogen. The traditional coal chemical wastewater treatment method is generally: first carry out air flotation degreasing, and then carry out anoxic-aerobic biochemical treatment. This method has a good treatment effect on phenols and alkane compounds, but the removal rate of difficult-to-degrade naphthalene, pyrrole, pyridine, carbazole and biphenyl and other polycyclic and heterocyclic compounds is still very low, and there is consumption. Shortcomings such as long time and large energy consumption. Therefore, there is an urgent need to design and design a n...

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