Advanced treatment method for coking distilled ammonia wastewater

Abstract

The invention discloses an advanced treatment method for coking distilled ammonia wastewater. The advanced treatment method comprises the following treatment steps: a, an acidification demulsification step of demulsifying coal tar in an emulsified state to turbid liquid, and controlling the pH value of acidizing fluid to be 1.5-3.5, wherein the demulsification time is 1-3 hours; b, an ozone pre-oxidation step of promoting the coal tar to separate out and oxidizing phenols and cyanogens dissolved in water; c, an air flotation step of separating the demulsified coal tar from water; d, a precision filtering step of performing secondary dephenolization and oil removal; e, a microelectrolysis step of removing partial organic matters and performing ring-opening chain scission on the organic matters, wherein the pH value of inflow water is controlled to be 2-3, the pH value of effluent is controlled to be 3-4, and the microelectrolysis time is 15-120 minutes; f, a Fenton oxidation step; g, a removed anoxic / aerobic bio-chemical step; and h, an electrolytic catalytic oxidation step of performing advanced treatment on organic matters and ammonia nitrogen. The treatment effect can reach the emission concentration limit requirements on COD (Chemical Oxygen Demand), ammonia nitrogen and total nitrogen in Integrated Wastewater Discharge Standard GB8978-1996.

Description

technical field [0001] The invention relates to the technical field of waste water treatment, in particular to a method for reuse after the depth of physicochemical pretreatment + anoxic biochemistry + aerobic biochemistry + electrolytic catalytic oxidation. Background technique [0002] Coking wastewater is industrial wastewater containing volatile phenols, polycyclic aromatic hydrocarbons, oxygen, sulfur, nitrogen and other heterocyclic compounds produced during the high-temperature dry distillation, purification and recovery of by-products of coking and gas. It is a kind of industrial wastewater with high CODcr, high phenol value, high Ammonia nitrogen and difficult to treat a kind of industrial organic wastewater. There are three main sources: one is residual ammonia water, which is the waste water produced in coal dry distillation and gas cooling, and its water volume accounts for more than half of the total coking waste water, which is the main source of coking waste w...

AI Technical Summary

Problems solved by technology

[0006] ① Coking wastewater contains phenols and cyanides that have toxic and inhibitory effects on microorganisms, resulting in low removal efficiency of the biochemical system;

[0007] ② Coking wastewater contains organic matter that is difficult to biodegrade, and it is difficult to meet the target requirements by biochemical treatment alone

[0008] In summary, coking ammonia distillation wastewater only adopts biochemical treatment, and it is difficult to meet the discharge or reuse standards, so it must be treated in depth

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