Organic wastewater biological treatment process of industrial waste lye

Abstract

The invention discloses an organic wastewater biological treatment process of industrial waste lye. The organic wastewater biological treatment process of the industrial waste lye comprises the steps: putting sulfuric acid into a regulating pool to reduce a pH value of wastewater to 6.5 to 7.5, and controlling hydraulic retention time of the wastewater in the regulating pool to be 30 to 48 hours; inletting the wastewater into an aeration tank through a lifting pump, conducting aeration through a microporous aeration head at the bottom of an aerobic tank to maintain dissolved oxygen contents to be 2 to 5 mg / l, adding 15 to 30 l / h of microbial intensifier to the aeration tank during an aeration process, maintaining the hydraulic retention time of the wastewater in the aeration tank to be 30 to 50 hours, maintaining the sludge concentration in the aeration tank to be 8,000 to 12,000 mg / L, and maintaining the water temperature in the aeration tank to be 38 DEG C or lower; inletting the wastewater into a sedimentation basin through a central guide cylinder, maintaining the hydraulic retention time of the wastewater in the sedimentation basin to be 5 to 10 hours, flowing sediment sludge of the sedimentation basin through a sludge reflux pump back to the aeration tank with a sludge reflux ratio of 50 to 100%, collecting liquid supernatant of the sedimentation basin through an effluent weir and conducting follow-up advanced treatment through pipeline pumping. The organic wastewater biological treatment process of the industrial waste lye is low in cost, low in running cost, and capable of effectively improving the biochemical treatment efficiency.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a biological treatment process for industrial waste lye organic wastewater, which is used for treating alkaline organic wastewater with high pollutant concentration produced by various alkali washing tower processes in the production of petrochemical enterprises. Background technique [0002] Taking the ethylene production process as an example, at present, in order to remove the sulfide in the ethylene gas during the cracking process, an alkali washing process is generally adopted. During the alkali washing process, waste water with a very high concentration of pollutants will be generated. Usually, this waste water The COD (chemical oxygen demand) value can reach tens of thousands to hundreds of thousands of ppm. For this waste water, the traditional method is to use wet catalytic oxidation to treat or sell it to small paper mills for paper (containing a large amoun...

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Problems solved by technology

[0002] Taking the ethylene production process as an example, at present, in order to remove the sulfide in the ethylene gas during the cracking process, an alkali washing process is generally adopted. During the alkali washing process, waste water with a very high concentration of pollutants will be generated. Usually, this waste water The COD (chemical oxygen demand) value can reach tens of thousands to hundreds of thousands of ppm. For this waste water, the traditional method is to use wet catalytic oxidation to treat or sell it to small paper mills for paper (containing a large amount of unreacted hydrogen oxide Sodium), however, the wet catalytic oxidation method has high one-time investment and high treatment cost, and because the boundary conditions of the method are extremely high, the minimal fluctuation of the main process will affect the system water output index; although the method sold to the paper industry uses waste, but caused the transfer of pollutants, aggravating the difficulty of sewage treatment of small papermaking, while the COD upper limit of the traditional biological activated sludge treatment sewage is about 10,000ppm, and the volume load is generally 1kg / m 3 .d below, can not meet the wastewater with such high pollutant concentration

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