Study On Advanced Treatment Of Dyeing And Finishing Of Textile Industry Waterwater By Catalysis Ozone Oxidation Process

The wastewater textile industry produces in production process is typically refractory wastewater. Because wastewater contains excessive biodegradable organics, alkali and poisonous substance, it is difficult for most domestic plants to demand the strict national emission standards by using biological treatment for the textile dyeing and finishing industry wastewater treatment.By carefully analyzing the characteristics of the textile dyeing and finishing industry wastewater, problems in treatment and advanced treatment techniques commonly used for it,our study utilizes catalytic ozonation technique as the method in the treatment to deal with the problem of non-compliance.The main findings are as follows:(1) The transition metal oxides such as Ni, Mn, Al and Cu were applied for advanced treatment of the treated effluent of textile dyeing wastewater. The optimal conditions were studied with an orthogonal experiment. The results showed that the catalytic efficiency of ozonation was the highest when the catalyst Ni dosage concentration was less than2g/L and ozone dosage was40mg/L, and the condition is0.8L/min of the gas flow rate and pH10. Namely, the CODCr removal rate was the highest, and the effluent could meet the national level A of discharging standards (CODCr<50mg/L)(2) We developed a new type of manganese catalyst in fixed bed depth processing. With the catalyst, process for wastewater CODCr removal rate can reach35%-40%, and catalytic cycle can be two days. After gas-water flushing the catalyst can still restore the catalytic activity. Coupled with BAF or using two stage catalytic process can meet the national level A of discharging standards (CODCr<50mg/L)(3) By taking continuous biological and ozone oxidation experiments, it is concluded that biological treatment has an effect on the catalytic ozone oxidation treatment effect. When the biological treatment HRT is30h, effluent CODCr can be up to105mg/L. After the first Ni or Two Stage Catalytic Ozone Oxidation, the effluent could meet the national level A of discharging standards.(4) Through the pilot experimental study, we found that different aeration mode, had different operating cost When using perforated tube aeration, equipment running power consumption is37.68Kwh, water power consumption per ton is1.57Kwh, the water running cost in pilot increases1.099yuan per ton. When using jet aeration equipment running power consumption is50.88Kwh, water power consumption per ton is2.12Kwh, the water running cost in pilot increases1.484yuan per ton.