Many Chinese paper and pulp industry are still using traditional CEH bleaching process, the wastewater which they discharge every year not only includes a large amount of COD and BOD, but also carcinogens materials, such as chlorophynols etc.

• 在我国还存在着大量的传统CEH三段漂白工艺,它们每年产生的废水不但向环境排放大量的COD和BOD,而且还释放出大量的氯酚等“三致”物质(致癌、致畸、致突变)。