Study On Advanced Treatment Of Textile Wastewater By Ozone Catalytic Oxidation

The Textile printing and dyeing industry in our country is prosperous, the integrated textile wastewater pollution is serious also. The integrated textile wastewater is characterized by big volume, high colority, poor biodegradability and etc, it’s difficult to achieve standard discharge by routine biological processes.The ozone catalytic oxidation technology was received much attention In order to solve the problem of low utilization efficiency of ozone oxidation, catalyst must be used. The homogeneous catalyst is easy to loss in the reaction and residue in the wastewater, and the heterogeneous catalyst can commendably solve these problems. The new catalyst will be developed for advanced treatment of integrated textile wastewater, and it will be of great significance for sustainable development of national economy and the enterprises after being extended in engineering application.The catalytic ozonization-biological aerated filter processes were used to treat textile wastewater using ceramsite loaded by catalysts and general ceramsite respectively.When the wastewater volume was 2000 ml, the oxidation time was 15 min, the O3 dosage was 90mg/L,the results showed that the COD of the wastewater was removed from 125 mg/L to 62 mg/L,the removal efficiency of COD was 51 %.The biodegradability of the wastewater is improved after ozone catalytic oxidation pretreatment. Compared with the ordinary ceramsite, catalytic ceramsite showed better catalytic effect. COD removal efficiency of catalytic ozonization-biological aerated filter process was more than 66 %.The ozone catalytic oxidation and oxidation alone were used to treat the textile wastewater after conventional treatment, in order to analyze and evaluate the efficiency and cost of these two advanced treatment of textile wastewater. The results show that both process can achieve the purpose of bleaching emission standard.Because of the larger pilot plant,the utilization of ozone has great elevation with the increase of contact time between the ozone and the wastewater When using catalyst and the ozone dosage is 30 mg/L, the effect of effluent is equal to the treatment effect 40 mg/L ozone with no calatyst, which saves the consumption of ozone and the operation cost can be decreased from RMB 0.45 to RMB 0.33 per cubic metre. Using catalyst, not only can save the cost of the ozone host device, but also can save operating cost about RMB 1,050,000 per year for one textile wastewater treatment project with capacity of 30000 tons per day, and the payback period of catalytic will be less than 2 years.