Printing and dyeing wastewater total nitrogen removal process

Abstract

The invention discloses a printing and dyeing wastewater total nitrogen removal process, and relates to the technical field of wastewater treatment, and the process comprises the following process steps: S1, introducing printing and dyeing wastewater into a grating well to remove large particles; s2, introducing the wastewater passing through the grating well into a regulating tank for homogenizing and averaging; s3, carrying out a biological contact oxidation reaction on the wastewater passing through the regulating tank in an anaerobic tank, wherein denitrifying bacteria are added into the anaerobic tank; s4, carrying out aerobic biochemical reaction on the wastewater treated by the anaerobic tank through an aerobic tank, wherein nitrifying bacteria and composite strains are added into the aerobic tank; s5, carrying out solid-liquid separation on the wastewater treated by the aerobic tank through a secondary sedimentation tank, introducing the separated supernate into a disinfectiontank for sterilization treatment, and refluxing residual sludge into the anaerobic tank in the step S2; and s6, discharging the wastewater treated by the disinfection tank after being detected to be qualified. The sewage treatment process has the advantage of improving the sewage treatment efficiency of nitrifying bacteria.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a total nitrogen removal process for printing and dyeing wastewater. Background technique [0002] The pollution in the printing and dyeing industry is mainly concentrated in the wastewater. The printing and dyeing wastewater mainly contains various residual organic auxiliaries in the printing and dyeing process, and the content of ammonia nitrogen is relatively high. Therefore, the treatment and discharge of printing and dyeing wastewater is a problem that every printing and dyeing factory needs to pay attention to. . [0003] In the existing printing and dyeing wastewater treatment, the removal of ammonia nitrogen is mainly carried out through the A / O biological contact oxidation process. The A / O biological contact oxidation process mainly includes anoxic and aerobic two stages. The ammonia nitrogen organic matter in the wastewater and the ammonia nitrogen in the ...

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Problems solved by technology

[0004] The above existing technical solutions have the following defects: usually the total nitrogen removal efficiency in the A / O biological contact oxidation process is affected by the concentration of impurities other than ammonia nitrogen in the wastewater, and in addition to ammonia nitrogen pollutants, printing and dyeing wastewater also contains Contains a variety of impurities, harmful components in impurities, such as bacteria harmful to nitrifying bacteria and denitrifying bacteria in printing and dyeing wastewater, these harmful components make the existing A / O biological contact oxidation process necessary for the removal of total nitrogen in printing and dyeing wastewater Long cycle times, low processing efficiency, and high cost

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