生化/催化铁内循环工艺处理精细化工区污水

在中试规模上研究了采用"催化铁+A/O生化"及"A/O生化/催化铁内循环"工艺处理高有机浓度精细化工区污水的效果及特点。实验证明,催化铁作为生化预处理工艺处理此污水铁填料表面出现结垢及有机物黏附的现象。生化/催化铁内循环工艺对污水CODCr、NH3-N去除率分别为73%、19%,生化/催化铁出水投加少量混凝剂、助凝剂后,C0DCr、BOD5、色度去除率分别为81%、95%、91%;生化/催化铁内循环工艺将催化铁置于生化后可有效提高催化铁反应效率,避免铁填料表面出现结垢及黏附层等现象,内循环可保证催化铁对生化的促进及对水中部分难降解有机物的去除,但此工艺仍存在氨氮去除效果不佳等问题待解决。

TREATMENT OF SEWAGE FROM FINE CHEMISTRY ZONE VIA BIO-TREATMENT-CATALYTIC IRON INNER-CYCLE PROCESS

Pilot experiments were conducted on the treatment of high concentration organic sewage from fine chemistry zone via catalytic iron A/O bio-treatmet and A/O bio-treatment-catalytic iron inner-cycle processes.The experiments indicated that:scale formed on the surface of iron and organic layer adhered on the surface of scale when catalytic iron was treated as biological pretreatment.A/O bio-treatment/catalytic iron inner-cycle process has removal efficiencies of 73% and 19% for COD_ Cr and NH_3-N respectively, and COD_ Cr ,BOD_5,color removal efficiencies reached 81%,95%,91% respectively after the additions of coagulant and flocculants; the placement of catalytic iron followed bio-treatment improved the removal efficiency of catalytic iron,and the formations of scale and organic layer were inhibited; the promotion to bio-treatment and the reduction of catalytic iron was realized by the inner-cycle process,but some problems such as inefficiency of NH_3-N removal remains to be settled in this process.