沸石滤床去除炼油废水中氨氮的研究

The study of ammonia nitrogen removal in oil refinery wastewater by zeolite percolator bed

中国石化广州石油化工厂炼油污水ＮＨ４－Ｎ含量高、ＣＯＤ/ＮＨ４－Ｎ比低,致使其具有经氧化沟处理后出水脱氮效果不稳定的特点,为此研制开发了一种沸石滤床。将氧化沟出水沉淀后连续导入沸石滤床(ＺＰＢ)及活性炭滤床(ＡＣＢ)与陶粒滤床(ＣＰＢ),控制滤速１ｍ·ｓ－１。运行结果表明:沸石滤床的氨氮平均去除率高于９９%,ＣＯＤ平均去除率为２４．８%,均大大高于活性炭滤床与陶粒滤床。

Waste water discharged from Guangzhou Branch of China Petrochemical Corporation Limited has high concentration of ammonium and low COD/NH4-N ratio .The waste water is treated by oxidation ditches and the removal efficiency of ammonium nitrogen is unstable. A zeolite percolator bed (ZPB) was developed and used to uptake and remove the ammonium nitrogen, organic compound, turbidity , etc. The oil refinery wastewater after treated by an oxidation ditch system and settlement process was fed to the ZPB continuously. The filtering velocity was 1 m·s-1. The results showed that the ammonium nitrogen removal efficiency by ZPB was greater than 99% within the high effective period, and the averaged COD removal efficiency was about 24.8% by ZPB system. The removal of ammonium nitrogen and COD by using ZPB system was much better than those of activated charcoal bed (ACB) system and ceramisite particle bed (CPB) system.