Method for treatment of wool washing waste water

Abstract

The invention provides a wool wastewater treatment method. The method comprises: 1) settling, 2) ultrafiltering to obtain the through liquid and condensed liquid, 3) treating the through liquid by reverse osmosis, treating the condensed liquid by recovery of lanolin, and 4) recycling the through liquid and condensed liquid from reverse osmosis respectively. The invention simplifies the wastewater treatment process and ways to avoid the problems of conventional approaches like longer process, not obvious effects, and secondary pollution caused by various chemicals and additives. The remarkable is that the water after every level of treatment process can be reused, which is conducive to recovery of lanolin and make full use of the treated water in the wool washing process, therefore achieving water recycling.

Description

technical field [0001] The invention relates to a treatment method for wool washing wastewater. Background technique [0002] Wool washing wastewater is high-concentration organic wastewater produced in the wool washing process. The composition is very complex. The main components of lanolin and other pollutants are in a suspended state due to saponification and emulsification, which is highly turbid. The water also contains Brucella, E. coli, carbon Bacteria that are pathogenic to humans. The lanolin content of wool washing wastewater is 5-20g / L, and the COD value is generally 4×10 4 ~6×10 4 Between mg / L, up to 10×10 4 mg / L. If this waste water is directly discharged into the water body, it will cause serious pollution to the environment, and lanolin in the waste water is still a kind of industrial raw material with high added value. [0003] The treatment methods of wool washing wastewater are reported: air flotation-contact oxidation-air f...

AI Technical Summary

Problems solved by technology

Moreover, the acid cracking method needs to consume a large amount of sulfuric acid

The lanolin is recovered by electrolysis, and the recovery rate can reach 52% to 55%. However, due to the hydrogen generated during the electrolysis process, when the air is mixed to a certain proportion, it will explode when encountering sparks, so the device is more complicated and maintenance is difficult. Trouble, consumes a lot of power

Using the extraction method, the recovery rate of lanolin can reach 60% to 70%, but due to the existence of an intermediate emulsified layer between the wool scouring wastewater and the actual, part of the solvent is removed with the wastewater, resulting in solvent loss and waste

If the coagulation method is used as a unit of wastewater treatment, it is used in conjunction with air flotation, electrolysis, extraction, etc., but due to the use of non-ionic detergents, the traditional coagulation recovery technology encounters some difficulties

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