Method for regenerating and recycling laundry waste water

Abstract

The invention relates to a method for regenerating and recycling laundry waste water, which is mainly used for regenerating and recycling laundry waste water discharged from intermittent industrial laundry machines which run independently in the laundry process of the laundry and dyeing industry. The aim of the invention is to treat laundry waste water by combining direct reuse of the laundry waste water or regeneration and recycling of the laundry water. The method comprises process treatment and front-end treatment. The process treatment is to direct reuse waste water which is laundry water from a laundry process flow in a countercurrent rinsing manner. An operation system in which the rinsing water flows continuously in a semi-intermittent manner and in which the laundry moves in an intermittent manner is designed for the intermittent industrial laundry machines which run independently, so as to realize the water use flow of the laundry water in countercurrent rinsing, and reduce volume of waste water in the rinsing phase; and under the conventional laundry process conditions, 50 to 70 percent of fresh water can be saved. The front-end treatment is to collect and treat waste water from the prewashing and waste water from the main washing in the production of laundry machines independently and treat the waste water by means of flocculation, centrifugal separation, filtration and the like, wherein the treated water is used in prewashing, main washing and rinsing and the reuse rate is 80 percent. The laundry waste water regenerating and recycling system constructed by combining process treatment and front-end treatment techniques comprehensively reduces consumption of fresh water by over 80 percent.

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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