Treatment system for washing waste water

Abstract

The present invention relates to a washing wastewater treatment system which belongs to the sewage treatment technical field. The system is mainly composed of a grid, a regulating tank, a flat-panel membrane bio-reaction tank, a cleaning and dosing box, an auto-control system and various pump valves. In the washing wastewater, the ratio of the biochemical oxygen demand (BOD5) for five days to the chemical oxygen demand (COD) is relatively lower and the biodegradability is poor while the content of anionic detergent is high and is hardly biodegradable, and also the wastewater contains filiform suspended substances. The invention overcomes the shortcomings of the prior art, and has the advantages of good treatment effect, simple technology process, convenient operation and management, less investment and lower operating costs. Each index of the effluent treated through the system reaches or excels the first-level standard for the maximum allowable pollutant emission concentration in the sewage discharge standards (GB8978-1996).

Description

technical field [0001] The invention relates to a washing wastewater treatment system, which belongs to the technical scope of sewage treatment. Background technique [0002] Five-day biochemical oxygen demand (BOD) in washing wastewater 5 ), the ratio of chemical oxygen demand (COD) is relatively low, and the biodegradability is poor, while the content of anionic detergent is high, it is difficult to biodegrade, and the wastewater contains fibrous suspended matter. The current method for separating washing wastewater is gravity separation, but it is difficult to separate the fibrous suspended matter contained in the wastewater, and the suspended solids (SS) in the effluent cannot fully meet the "Comprehensive Wastewater Discharge Standard" (GB8978-1996). In addition, conventional Due to the concentration of mixed liquid suspended solids (MLSS) in the treatment system is usually 3-5g / L, the sewage treatment effect is not good. [0003] In addition, the technology of using ...

AI Technical Summary

Problems solved by technology

The current method for separating washing wastewater is gravity separation, but it is difficult to separate the fibrous suspended matter contained in the wastewater, and the suspended solids (SS) in the effluent cannot fully meet the "Comprehensive Wastewater Discharge Standard" (GB8978-1996). In addition, conventional Due to the concentration of mixed liquid suspended solids (MLSS) in the treatment system is usually 3-5g / L, the sewage treatment effect is not good

[0003] In addition, the technology of using hollow fiber membranes for mud-water separation is easy to entangle with the hollow fiber filaments due to the fibrous suspended matter contained in the wastewater, which leads to a large amount of sludge in the mixed solution depositing on the surface of the hollow fiber membrane. The water volume decays quickly, so that after a period of time, the effluent flow rate is too low, and the treated effluent cannot be obtained normally.

Images