TiO2光催化氧化法处理草浆纸厂废水的研究

以TiO2做催化剂,用光催化氧化法处理碱法草浆纸厂废水.讨论了pH值、H2O2的用量、催化剂用量、光照时间等因素对CODCr去除率的影响,优选了反应条件.结果表明:在 pH=6.08,TiO2用量为0.03 g,光照时间3 h,H2O2量(体积分数)为0.60%的条件下,废水的CODCr去除率可达96%以上.处理后废水达到排放标准.

Quick paper-making wastewater treatment by TiO2 photo-catalyzed oxidation

This paper aims to introduce the author's developed new method on treating straw pulp papermaking wastewater by means of photo-catalyzed oxidation TiO_2as the catalyst. The mechanism mainly involves a reaction between hydroxyl free radicals generated in the photo-catalyzed oxidation process and pollutants in the wastewater with the latter being degraded. Our experiments prove that the presence of a small amount of H_2O_2 can increase the disposal effect significantly. To prove the influence of such experimental parameters as pH value, the amounts of H_2O_2 and catalyst, the author has done careful studies on the COD_(Cr) removing rate together with the optimum reaction parameters, such as the initial pH value as 6.08, the amount of TiO_2as 0.03 g and H_2O_2concentration at 0.60% (V/V). The result is that it is necessary to irradiate the wastewater for 3 hours under a 300 W mercury light under the above said conditions to reach a COD_(Cr) removal rate of 96%. And consequently, the wastewater treated will be able to meet the environment-protection standard when released.