Regeneration and cyclic utilization method for linen laundry wastewater

Abstract

The invention relates to a method for regeneration and cyclic utilization of laundry wastewater. By way of combining direct reuse of laundry wastewater and regeneration and cyclic utilization, the laundry wastewater is treated, comprising course treatment and front-end treatment. The course treatment means that rinse water in a laundry process flow is directly reused in form of countercurrent rinsing. By designing an operating system where the rinse water continuously flows in a semi-intermittent manner and the washed matters are intermittent for an independently operated intermittent industrial washing machine, a water use flow of countercurrent rinsing of the rinse water is realized, the wastewater amount of a rinsing stage is reduced, and 50-70% of fresh water dosage can be saved. The front-end treatment means that wastewater generated in pre-washing and principle-washing in laundry production is independently collected and treated, and the treated water after flocculation, centrifugal separation and filtration is used in pre-washing, principle-washing and rinsing, so that the reuse rate reaches 80%; the laundry wastewater regeneration and cyclic utilization system established by combining the technologies of course treatment and front-end treatment comprehensively saves over 80% of fresh water dosage.

Description

technical field [0001] The invention relates to a method for regeneration and recycling of laundry wastewater, which can be mainly used for regeneration and recycling of laundry wastewater discharged from intermittent industrial washing machines operating independently in the laundry industry. Background technique [0002] my country is one of the 12 countries and regions that suffer from severe water shortages. According to statistics in 2008, the total amount of water resources in my country is 2,743.43 billion cubic meters, and the per capita water resources are 2,071.1 cubic meters, which is only 1 / 4 of the world's average level. , ranked 110th, with a total national water supply of 591.0 billion cubic meters. At the end of the 20th century, more than 400 of the more than 600 cities in the country suffered from insufficient water supply. The national water shortage reached 40 billion cubic meters, and nearly two-thirds of the cities suffered from water shortage to varying...

AI Technical Summary

Problems solved by technology

There are also some problems that need to be solved urgently in the washing and dyeing industry: the industry standard system is not perfect, there is a lack of skilled workers, the washing and dyeing equipment and quality monitoring methods are relatively backward, the level of modernization is not high, and the washing quality, service and technology are compared with those of Europe, the United States, and other countries. There is a big gap between Japan and other countries that are at the leading level in the international laundry and dyeing industry, etc.

Due to the centralized collection of all wastewater, the components of the wastewater are complex, and the treatment is costly and difficult; in practical applications, the discharge of pollutants often exceeds the standard. For laundry wastewater, the anionic surfactant (LAS) usually exceeds the standard.

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