Introduction

(1) The biochemical treatment process with "anaerobic hydrolysis-aerobic biochemical" as the main body is adopted.Anaerobic hydrolysis is a biological reaction that controls wastewater under …

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(1) The biochemical treatment process with "anaerobic hydrolysis-aerobic biochemical" as the main body is adopted.Anaerobic hydrolysis is a biological reaction that controls wastewater under anaerobic conditions in the hydrolysis-acidification stage.Its function is to convert macromolecular organic matter Jiang Weijie into small molecular substances. This macromolecular organic matter has many molecules and is difficult to biodegrade.Due to the existence of refractory macromolecular organics such as various fuels and additives, printing and dyeing wastewater has high COD.The anaerobic hydrolysis treatment unit can ensure the degradation of organic matter under aerobic conditions.Chemicals for printing and dyeing wastewater treatment

(2) Biological contact oxidation is used in the aerobic unit of most of the standard enterprise wastewater.The biological contact oxidation process is mature, has lower electricity cost than the traditional activated sludge process, is easy to operate and manage, and is a stable and reliable multi-selection oxygen treatment process.However, this method has poor adaptability to high-concentration organic matter, and the hydraulic flow pattern is prone to short-circuit when the pool is not divided, so it is not suitable for large-volume centralized sewage treatment plants.For printing and dyeing wastewater with a large amount of water, oxidation ditch or SBR, CAST process should be used.

(3) Compared with the traditional sedimentation tank, the air flotation treatment of the physical and chemical treatment unit occupies less area and has better treatment effect.At the same time, the removal effect of the common activator LAS in printing and dyeing wastewater is good.Pressure dissolved air flotation has mature operating experience and perfect control technology, and has been widely used in printing and dyeing wastewater treatment.

(4) Coagulation is the key to physical and chemical treatment (sedimentation and air flotation), and should be designed in strict accordance with the hydraulic conditions required by coagulation technology.Choice of coagulants [such as ferrous sulfate, calcium hydroxide, polyaluminum chloride, aluminum sulfate, polyferric sulfate, etc. ]The dosage of the reagent should be determined by experiments according to the type and residual amount of the dye used in the printing and dyeing process.Coagulation technology has certain requirements on the pH value of water. The coagulation effect determines the quality of the effluent, and the dosing is related to the operating cost, so the design and selection of the coagulation process should be very careful.

(5) The application of engineering bacteria in biological treatment has been seen in some engineering examples, and some have achieved quite good results, but now they are faced with the degradation of bacteria in a specific water environment, and if they are added regularly, they will also face cost issues .With the continuous development of microbial technology, it will have a significant impact on the treatment of printing and dyeing wastewater.

(6) The use of new wastewater treatment technologies and processes can improve the treatment efficiency and effect, such as membrane technology, activated carbon, diatomite adsorption technology, photooxidation technology, anaerobic technology (UASB, AAFEB, etc.). ), aerobic technology (CAST, SBR, MBR, alternate oxidation ditch, etc.).

(7) Improve the operation and management level of the sewage treatment station.Skilled workers should be trained and certified and have a responsibility system for water treatment.The necessary automatic control instruments and microcomputer technology in the treatment station are essential to improve the operation level of the sewage station.

(8) The level of cleaner production and the concept of circular economy.If the printing and dyeing wastewater is purely economical and not output, it will inevitably bring a burden to the enterprise, making it difficult for the wastewater treatment project to operate stably.The fundamental way is to improve the level of clean production, save and recycle raw and auxiliary materials, and use the treated effluent for advanced treatment for production, so that enterprises can enter a virtuous circle.