Treatment Technology of Wastewater from Alkali Pretreatment of Polyester Fabric

Abstract

The invention relates to a treatment process for polyester fabric base pretreatment wastewater, and belongs to the technical field of wastewater treatment of textile enterprises. The treatment process comprises the following steps: enabling alkali wastewater of which the pH value reaches 14 or more to pass through an alkali absorption resin layer by using an exchange principle of alkali absorption resin to enable the alkali absorption resin layer to adsorb hydroxy radicals until the pH value of the water coming from the alkali absorption resin layer reaches 12 or more, and then regarding that the alkali absorption process of the alkali absorption resin layer is ended; then, adjusting the pH value of the wastewater after alkali absorption by the alkali absorption resin layer to be 3-4; then, performing pressure filtration; and finally, introducing acidic filtrate obtained by the pressure filtration into the alkali absorption resin layer to enable the pH value of the water coming out of the alkali absorption resin layer to be 6.5 or more so as to achieve an aim of neutralization, and meanwhile, performing biochemical treatment on the wastewater discharged from the alkali absorption resin layer to achieve emission up to standard. When the pH value of the water coming from the alkali absorption resin layer is less than 6.5, the above process is repeated. The treatment process for the polyester fabric base pretreatment wastewater, provided by the invention, does not need adding lime, and needs a small adding amount of acid.

Description

technical field [0001] The invention relates to a treatment process for polyester fabric alkali pretreatment wastewater, which belongs to the technical field of textile enterprise wastewater treatment. Background technique [0002] The pH value of the polyester fabric alkali pretreatment wastewater is above 14, the alkali concentration is 5-6g / L, and the COD is 30,000. In order to meet the standard discharge requirements, the existing polyester fabric alkali pretreatment wastewater treatment process is: add acid to adjust the pH value to 3-4 (acid analysis) → filter press (solid-liquid separation) → add lime to the filtrate Neutralize, adjust the pH value of the filtrate to about 7, COD to 8000, and generate waste residue at the same time → mix the filtrate with the dyeing wastewater in the workshop → perform biochemical treatment to achieve discharge standards. This existing treatment process mainly has two defects: 1. the application of lime has increased the generation o...

AI Technical Summary

Problems solved by technology

This existing treatment process mainly has two defects: 1. the application of lime has increased the generation of waste residue, and has also increased production cost simultaneously; Favorable for biochemical treatment

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