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...

Examples

Embodiment 1

[0038] Example 1: Flocculation and separation of main wash preparation wastewater

[0039] According to the method of the content of the invention (2), weigh 2.0g of general washing powder, add 870ml of water, heat to 70°C, add 1.0g of color bleaching powder, dissolve and keep warm for 15 minutes, add 1.0ml of polymaleic acid after cooling, add 5g after stirring / L cationic organic polymer flocculant E 130ml, the total volume is about 1L, after stirring, let it stand for 15 minutes, use qualitative filter paper as the filter material to statically filter, recover about 850ml of filtrate, test the pH of the filtrate to be 6, and the light transmittance is 98.0%, the turbidity is 4.83NTU, and the surface tension is 35.6mN / m. Example 2: Flocculation and separation of main wash wastewater for sports socks

Embodiment 2

[0040] According to the method of the content of the invention (2), take 7 sports socks weighing 100g, weigh 2.0g of general-purpose washing powder, add 870ml of water, put them into the sports socks, stir and heat to 70°C, add 1.0g of oxygen bleaching powder to dissolve, stir and keep warm for 15 minutes , take out the sports socks, the remaining raffinate is about 770ml, after cooling, add 1.0ml polymaleic acid and stir, then add 20.0g / L cationic organic polymer flocculant E 125ml, stir and stand for 15 minutes, then add 1.0g / L polymaleic acid Coagulant aid 150ml, total volume about 1L, leave standstill for 10 minutes after stirring, carry out floc separation according to the method of content of the invention (4), reclaim filtrate about 900ml, measure filtrate pH value is 6-7, light transmittance is 96.7% , the turbidity is 5.93NTU, and the surface tension is 61.4mN / m.

Embodiment 3

[0041] Example 3: Flocculation and separation of single detergent components in main wash preparation wastewater

[0042] Weigh 1.25g of soap according to the method of the content of the invention (2), dissolve it in 700ml of water at 50°C, heat to 70°C, add 1.0g of color bleaching powder, dissolve and keep warm for 15 minutes, add 1ml of polymaleic acid after cooling, and stir for 10 minutes Minutes later, add 300ml of cationic organic macromolecule flocculant E of 5g / L, add up to about 1L, leave standstill for 15 minutes after stirring, filter with qualitative filter paper, measure the pH value of filtrate to be 6, light transmittance is 99.0%, turbidity is 4.05NTU, the surface tension is 65.9mN / m; Weigh 2.0g of strong washing powder, dissolve it in 720ml of water, heat to 70°C, add 1.0g of color bleaching powder, dissolve and keep it for 15 minutes, add 0.5ml of polymalay after cooling Acid, after stirring for 5 minutes, add 280ml of 5g / L cationic organic polymer flocculan...

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...

Examples

Embodiment 1

[0038] Example 1: Flocculation and separation of main wash preparation wastewater

[0039] According to the method of the content of the invention (2), weigh 2.0g of general washing powder, add 870ml of water, heat to 70°C, add 1.0g of color bleaching powder, dissolve and keep warm for 15 minutes, add 1.0ml of polymaleic acid after cooling, add 5g after stirring / L cationic organic polymer flocculant E 130ml, the total volume is about 1L, after stirring, let it stand for 15 minutes, use qualitative filter paper as the filter material to statically filter, recover about 850ml of filtrate, test the pH of the filtrate to be 6, and the light transmittance is 98.0%, the turbidity is 4.83NTU, and the surface tension is 35.6mN / m. Example 2: Flocculation and separation of main wash wastewater for sports socks

Embodiment 2

[0040] According to the method of the content of the invention (2), take 7 sports socks weighing 100g, weigh 2.0g of general-purpose washing powder, add 870ml of water, put them into the sports socks, stir and heat to 70°C, add 1.0g of oxygen bleaching powder to dissolve, stir and keep warm for 15 minutes , take out the sports socks, the remaining raffinate is about 770ml, after cooling, add 1.0ml polymaleic acid and stir, then add 20.0g / L cationic organic polymer flocculant E 125ml, stir and stand for 15 minutes, then add 1.0g / L polymaleic acid Coagulant aid 150ml, total volume about 1L, leave standstill for 10 minutes after stirring, carry out floc separation according to the method of content of the invention (4), reclaim filtrate about 900ml, measure filtrate pH value is 6-7, light transmittance is 96.7% , the turbidity is 5.93NTU, and the surface tension is 61.4mN / m.

Embodiment 3

[0041] Example 3: Flocculation and separation of single detergent components in main wash preparation wastewater

[0042] Weigh 1.25g of soap according to the method of the content of the invention (2), dissolve it in 700ml of water at 50°C, heat to 70°C, add 1.0g of color bleaching powder, dissolve and keep warm for 15 minutes, add 1ml of polymaleic acid after cooling, and stir for 10 minutes Minutes later, add 300ml of cationic organic macromolecule flocculant E of 5g / L, add up to about 1L, leave standstill for 15 minutes after stirring, filter with qualitative filter paper, measure the pH value of filtrate to be 6, light transmittance is 99.0%, turbidity is 4.05NTU, the surface tension is 65.9mN / m; Weigh 2.0g of strong washing powder, dissolve it in 720ml of water, heat to 70°C, add 1.0g of color bleaching powder, dissolve and keep it for 15 minutes, add 0.5ml of polymalay after cooling Acid, after stirring for 5 minutes, add 280ml of 5g / L cationic organic polymer flocculan...

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