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Silk degumming wastewater is a high concentration of organic wastewater, which has good biodegradability. The concentration index of concentrated degumming wastewater generally has a COD of 5000 to 10000 mg/L, a BOD5 of 2500 to 5000 mg/L, and a pH of 9.0 to 9.5. Generally, the degumming high-concentration wastewater has a small amount of water, and the degumming and flushing water volume is large, and the water concentration is low, and the COD is 500-1000 mg/L, and the BOD5 is 300-600 mg/L. Generally, the separation treatment is carried out after the separation treatment, or all the wastewater is directly mixed and then processed. The quality of the treatment process is shown in the following figure.
Typical process for silk degumming wastewater treatment
In the process, two grids are arranged, and the anaerobic tank adopts the UASB form, and the residence time is 6-12 hours. The normal temperature anaerobic fermentation adopts COD removal rate of 80%-85%.
The adjustment cell residence time is 6-8h.
The residence time of the biological contact oxidation tank is 4-6 h, and the gas-water ratio is 18:1-20:1. The two-stage method is generally adopted, and the COD removal rate is about 60%.
The residence time of activated sludge is 8-10h, and the COD removal rate is 60%-65%.
The sedimentation time of the secondary settling tank is 1.5 to 2 hours, usually in vertical flow.
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