A treatment system and treatment method for sewage containing high-concentration formaldehyde

Abstract

The invention relates to a high-concentration formaldehyde sewage treatment system which comprises a physicochemical pretreatment system, a biochemical pretreatment system and an after-treatment system, wherein the physicochemical pretreatment system and biochemical pretreatment system are connected to a process wastewater outlet end in series or parallel, thereby sequentially or independently performing pretreatment on the process wastewater; and the after-treatment system is connected with the biochemical pretreatment system in series and used for carrying out after-treatment on the pretreated process wastewater. The method for treating the high-concentration formaldehyde sewage by using the treatment system comprises the steps of physicochemical pretreatment, biochemical pretreatment and after-treatment. The treatment system can solve the problem that the traditional sewage treatment system has poor resistance and can easily produce unqualified effluent water when the formaldehyde concentration fluctuates. The treatment system effectively lowers the formaldehyde concentration in the product process wastewater, obviously reduces the load of the subsequent biochemical system, and avoids the problem of activity reduction of the biochemical system due to the formaldehyde accumulation.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a treatment system and a treatment method for sewage containing high-concentration formaldehyde. Background technique [0002] Formaldehyde is also called formaldehyde and methylene oxide. The English name is Formaldehyde, and the CAS number is 50-00-0. It is a colorless gas with a strong irritating and suffocating smell. Formaldehyde is easily soluble in water and ether, and the concentration of the aqueous solution can reach up to 55%. Formaldehyde is gaseous at room temperature, with a boiling point of -19.5°C, so it is extremely volatile at room temperature, and usually appears in the form of an aqueous solution, of which 35%-40% formaldehyde aqueous solution is commonly known as formalin. Formaldehyde has a good binding performance with water, and it can combine with water in any proportion, but under the agitation of air, formaldehyde escapes in the form of gas. [0003] V...

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Problems solved by technology

[0008] The technical problem to be solved by the present invention is to provide a method that can solve the problem that the traditional sewage treatment system has poor system tolerance when the formaldehyde concentration fluctuates, and easily leads to the problem of unqualified external drainage after treatment; at the same time, it can effectively reduce the concentration of formaldehyde in the product process wastewater. Concentration, significantly reduce the load of the subsequent biochemical system, eliminate the problem of reduced biochemical system activity due to the accumulation of formaldehyde, a treatment system for sewage containing high concentration of formaldehyde, and also provide a treatment method for sewage containing high concentration of formaldehyde using the above treatment system

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