Efficient biochemical treatment method for printing and dyeing wastewater

Abstract

The invention belongs to the technical field of printing and dyeing wastewater treatment, and particularly relates to an efficient biochemical treatment method for printing and dyeing wastewater. Themethod comprises the following steps: S1, preparing a complex microbial inoculant stock solution from a complex microbial inoculant, performing activating, preparing a complex microbial inoculant diluent from the activated complex microbial inoculant stock solution again, and sequentially performing activating and culturing; S2, carrying out sludge inoculation by utilizing the cultured complex microbial inoculant diluent through a high-concentration activated sludge process to obtain high-concentration activated sludge; and S3, allowing the printing and dyeing wastewater subjected to physicochemical treatment to sequentially pass through a first anaerobic tank, a second anaerobic tank, a third anaerobic tank, a first aerobic tank, a second aerobic tank, a third aerobic tank, a fourth aerobic tank, a primary sedimentation tank and a secondary sedimentation tank, and discharging water, wherein high-concentration activated sludge and a cultured complex microbial inoculant diluent are added into the first aerobic tank, sludge in the fourth aerobic tank flows back to the first anaerobic tank, and sludge in the primary sedimentation tank flows back to the first anaerobic tank, so that the biochemical treatment effect reaches the optimal state.

Description

technical field [0001] The invention belongs to the technical field of printing and dyeing wastewater treatment, and in particular relates to a high-efficiency biochemical treatment method for printing and dyeing wastewater. Background technique [0002] The rapid development of the printing and dyeing industry makes its proportion in the discharge of industrial wastewater larger and larger, and the printing and dyeing wastewater accounts for about 35% of the entire industrial wastewater. Printing and dyeing wastewater has the characteristics of large discharge, high content of organic pollutants, dark color, high alkalinity, and poor biodegradability, which increases the difficulty of wastewater treatment. With the progress of dyeing and finishing process research, more new chemical substances such as polyvinyl alcohol PVA, dyes, sodium alginate, methyl cellulose, new additives and other difficult biodegradable new organic substances enter the printing and dyeing wastewater...

AI Technical Summary

Problems solved by technology

However, the existing biochemical treatment methods have many disadvantages, for example, the living environment of the bacterial agent is single, and the treatment effect is not very significant, etc.

[0004] In the prior art, the patent document with the publication number CN104402167A discloses a biochemical treatment method for printing and dyeing wastewater, which mainly has two characteristics: (1) the wastewater is separated and treated by a combination of aerobic and anaerobic methods; (2) Sludge reflux in the aerobic stage; the output of sludge can be reduced by 80-90%, and the COD removal rate of chemical oxygen demand can reach 85-95%, which has certain advantages, but its relative treatment cost is relatively high , the removal rate of COD is not very stable and has certain randomness

In addition, the patent document with the publication number CN109694158A discloses a treatment method for printing and dyeing wastewater, which includes the following steps: (1) placing the printing and dyeing wastewater after sedimentation in a reactor to remove the reacted particles; Add the printing and dyeing wastewater after oil removal to the electrolytic cell, add acid to adjust the pH to 3-5, the volume ratio of wastewater to conductive particles is 3:4, adjust the pH to 8-9 after reacting for 1-4 hours, and stand for 20 minutes to obtain the supernatant (3) transfer the supernatant obtained after electrolysis into the biodegradation tank, adjust the pH to 6-7, and process for 5-8h; (4) add wastewater treatment agent to the printing and dyeing wastewater after biodegradation treatment, and the amount ratio is 1:36, discharge after half an hour of reaction; the removal rate of COD can reach more than 90%, and other pollutant indicators are also greatly reduced; but there are also certain shortcomings, such as high operation complexity, pH and other parameters in the biodegradation pool The requirements are harsh, indicating that the living environment of the bacteria is single and cannot adapt to a wide range of fluctuating physical and chemical environments. Moreover, after biochemical treatment, wastewater treatment agents are still required to completely treat the wastewater, indicating that the biochemical treatment is weak, and at the same time increases processing cost

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