Study On Advanced Treatment And Reuse Of Refined Cotton Wastewater

Refined cotton is widely used and is one of the important raw materials for modern textile,pharmaceutical,chemical,military and other industries.During the production process of refined cotton,a large amount of cooking black liquor and bleaching wastewater will be produced.In industrial applications,it is treated by physicochemical-biochemical treatment.After treatment,the organic pollutants in water are greatly reduced,but direct discharge still has certain influence on the environment,and The large consumption of water resources in production seriously restricts the development of the refined cotton industry.At present,the refined cotton production process is mature and the water consumption is difficult to reduce.How to recycle and recycle wastewater has become the key to solving the development of the refined cotton industry.In this paper,the refined cotton wastewater treated by treatment is deepened to explore the reuse of refined cotton wastewater.The main research includes refining cotton wastewater by adsorption treatment,selecting better adsorbent and optimizing adsorption parameters.The Fenton method and Fe/C micro-electrolysis method are used to treat refined cotton wastewater,and the optimal conditions for the reaction are investigated.Electrolysis was combined with Fenton to determine the reaction effect.The effect of chloride ion on Fe/C micro-electrolysis was determined by comparing the effect of common wastewater with deionized chlorine pretreated with CaO/NaAlO₂by Fe/C micro-electrolysis-Fenton treatment.-Fenton's influence,after GC-MS analysis of wastewater treatment components;treatment of wastewater by reverse osmosis,and determination of wastewater reuse by wastewater pilot test and workshop reuse experiment.conclusion as below:?1?The wastewater was treated with coal activated carbon,coconut shell activated carbon,activated carbon fiber and zeolite.The effect size was zeolite>activated carbon fiber>coconut activated carbon>coal activated carbon;The activated carbon fiber was added in an amount of 10 g/L,the adsorption time is 3 h,the adsorption temperature was30?,and the wastewater p H value is 6,the COD removal rate of the wastewater reached30%.artificial zeolite when the dosage is 10g/L,adsorption time is 4h,adsorption temperature is 30?,at p H 6,the COD removal rate reached 38.12%.?2?Treating refined cotton wastewater by Fenton method,when the p H is 3,the addition amount of H₂O₂is 1ml,and the addition of Fe SO₄is 0.6g in 500ml of wastewater,the COD removal rate of wastewater is 44%;using Fe/C microelectrolysis the experiment carried out,the COD removal rate of wastewater was 20.21%when the reaction time was3h;if Fe/C microelectrolysis was combined with Fenton method,the COD removal rate reached 65.625%.?3?Treatment of chloride ions in wastewater by CaO/NaAlO₂method,the influencing factor is n(Ca²⁺):n?Cl^-?>n(Ca²⁺):n(Al³⁺)>reaction time,when n(Ca²⁺):n The ratio of?Cl^-?is 11:1,the ratio of n(Ca²⁺):n(Al³⁺)is 6:1,and the removal rate of chloride ion is 84.11%when the reaction time is 2h.The Fe/C micro-electrolysis-Fenton combination experiment was continued,and the COD removal rate was increased from 65.625%to81.25%.After GC-MS analysis,most of the main 9 organic pollutants in the wastewater have been removed,and only a small amount of?-sitosterol remains.?4?Reverse osmosis treatment of refined cotton wastewater,after two treatments,the COD is basically removed,the chloride ion is reduced to 55mg/l or less,and the wastewater can be fully used for standard recovery.For the pilot test of wastewater,the COD and chloride ion of wastewater are reduced within 10mg/L.The waste water is used in the refined cotton rinsing section.The indexes of the cotton pulp are normal compared with the same batch of cotton pulp,and the wastewater is recycled.