Combined treatment method of 1,4-butanediol production wastewater

Abstract

The invention relates to a combined treatment method of 1,4-butanediol production wastewater, which comprises the following steps: carrying out physical and chemical pretreatment on wastewater firstly so as to obtain pre-optimized wastewater; improving the biodegradability of the wastewater and further reducing the COD (chemical oxygen demand) concentration of the wastewater through an upflow anaerobic reactor and an aerobic combined biochemical reaction tank; and after the muddy water separation of the wastewater is realized through a secondary sedimentation tank, sequentially feeding the wastewater into a coagu-flocculation reaction settling pond and a biological filter, carrying out deep treatment on the wastewater, removing substances such as tiny suspended solids and colloids and the like in the wastewater through coagu-flocculation reaction and precipitation, and enabling discharged water to meet the requirements of one-class A standards in the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB18918-2002) through the synergistic effect of adsorption and biodegradation of the biological filter. The method disclosed by the invention not only has a stable removal effect on COD in 1,4-butanediol production wastewater, but also can effectively resist violent water impacts; and the method has the characteristics of rapid system startup and the like. The method disclosed by the invention also can be applied to the treatment of other high-concentration toxic degradation-resistant organic wastewater with a water quality similar to that of 1,4-butanediol production wastewater.

Description

technical field [0001] The invention discloses a combined method for treating 1,4-butanediol production wastewater, which relates to the treatment of 1,4-butanediol production wastewater. The invention belongs to the technical field of wastewater treatment in environmental engineering technology. Background technique [0002] The main production method of 1,4-butanediol is to use acetylene and formaldehyde as raw materials, catalyzed by copper and other heavy metal catalysts to generate 1,4-butynediol and by-product propargyl alcohol, etc., 1,4-butyne The diol is further hydrogenated to 1,4-butanediol. Therefore, the composition of 1,4-butanediol production wastewater is complex, containing toxic and refractory organic substances such as acetylene alcohol and formaldehyde, and has the characteristics of high COD, high chroma, high pH, ​​high alcohol content, and contains a small amount of copper ions Heavy metals and high salt content. 1,4-butanediol in 1,4-butanediol pro...

AI Technical Summary

Problems solved by technology

This process has limitations such as the need to strictly control the influent COD concentration below 1000mg / L, low impact resistance, and the effluent can only meet the first-level discharge standard (COD below 100mg / L) of the "Integrated Wastewater Discharge Standard" (GB8978-1996); And because the pH adjustment and biodegradability improvement of 1,4-butanediol production wastewater are not considered, when the toxic and refractory organic matter increases, the microbial activity in the reactor is easily inhibited, and the effluent quality is unstable, etc.

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