Backwashing water discharge reduction method of tow filter

Abstract

The invention provides a backwashing water discharge reduction or even zero discharge method of a tow filter, which is characterized in that the backwashing is carried out on the tow filter by spinning two-bath low-acid water, then, the backwashing water is collected and is filtered by a diatomite precoating filter, and the filtered backwashing water is evaporated or crystallized and is then discharged to a sewage treatment system. The method has the advantages that the pressure of the backwashing water of the tow filter on the sewage treatment can be reduced, the environment pollution is reduced, and the work efficiency of the sewage treatment system is improved.

Description

technical field [0001] The invention relates to a new process in the field of viscose fiber industrial sewage treatment, in particular to a method for reducing the emission of sulfate radicals in backwashing water of tow filters in acid station workshops. Background technique [0002] Wastewater with high sulfate content is discharged into the environment, which will have an impact on the soil and water environmental systems. High sulfate wastewater is discharged to the soil for a long time. When the sulfate content exceeds the soil environmental capacity and self-purification capacity, it will lead to soil salinization, destroy its ecosystem, and make it difficult to restore land resources; if sulfate wastewater is discharged into drinking water sources It may lead to excessive sulfate content in drinking water sources or groundwater, resulting in excessive sulfate in drinking water, damaging the environment, and endangering human health. If the sulfate-containing wastewat...

AI Technical Summary

Problems solved by technology

[0003] At present, the sewage system of viscose factories generally has high sulfate radicals. The sources of sulfate radicals mainly include acidic water in spinning workshops and secondary baths (spinning and plasticizing baths, which are returned to acid by most viscose factories. , a small number of acid stations for recycling) overflow and the backwash filter of the tow filter in the acid station workshop, in which the external drainage of the backwash filter mainly comes from the existing backwash filter process operation in the acid station workshop (the operation process is mainly first Close the acid valve at the inlet and outlet of the filter to stop using the filter, then empty the acid bath in the filter to the dirty acid pool, and after draining for 3-4 hours, open the backwash water valve of the filter and inject flash condensate into the filter The liquid level is about 2 / 3, close the water inlet valve, open the compressed air valve to stir and purge for 20 minutes, then drain the backwash water to the sewage, and backwash 2-3 times in this way), and the SO in the backwash drainage is detected 4 2- The content is more than 30000PPm, so that a large amount of SO 4 2- Discharged to the sewage treatment plant, increasing its treatment burden

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