TiO_2/SiO_2复合膜光催化降解DDNP废水试验研究

Experimental Study on the Photocatalytic Degradation of DDNP Waste Water by TiO_2/SiO_2 Composite Film

采用液相沉积法在煤矸石烧结滤料表面制备了TiO2/SiO2复合膜,研究了TiO2/SiO2复合膜对淮南某化工厂DDNP废水的光催化降解效果。试验结果表明:在将废水稀释20倍(CODCr为318mg/L,色度为3750倍),使废水初始pH为3,投加占废水体积0.9%的双氧水,以及光照的同时辅之以曝气条件下,用TiO2/SiO2复合膜对废水光催化降解1h,废水脱色率和CODCr下降率分别达到75.54%和61.51%,效果比较理想。

TiO2/SiO2 composite film made by liquid deposition on the surface of coal fuse sintered filter material was used to study its photocatalytic degradation effect for DNNP waste water from a Huannan chemical plant. The test result achieved a decoloration rate and CODCr decrease of 75.54% and 61.51% respectively at one hour degradation with TiO2 SiO2 composite film with also lighting and aeration, where the waste water （CODCr , 318 mg/L and chroma, 3 750 times） was first diluted by 20 times to gain an initial pH of 3, into which oxydol was added at a dosage that was 0.9% of the waste water volume. The result was ideal.