摘要：

某丝绒印染废水难生化降解、水质多变，COD_Cr、色度和SS分别为817～1930mg/L、229～800倍和542～1000mg/L.采用传统的生物接触氧化-气浮组合处理工艺系统，出水COD_Cr和色度分别在400mg/L和200倍以上，远不能达国家污水排放标准；应用缺氧/二级好氧废水处理新工艺对原生化系统进行改造后，出水COD_Cr、色度和SS分别小于69mg/L,40倍和17mg/L,达国家太湖流域污水一级排放标准

关键词: 印染废水, 难降解有机物, 缺氧／二级好氧（A／O~2）工艺, 生物处理

Abstract:

The effluent of the conventional system treating the wastewater by the biocontact oxidation process cannot satisfy the national standards of sewage discharge and is above 400 mg/L and 200 multiple for COD and colority respectively under the condition of COD 817～1 930 mg/L, colority 229～800 multiple and SS 542～1 000 mg/L for the wastewater being biorefractory and varying greatly in a velvet printing and dyeing plant. The old biological treatment system is reformed in anoxic/two-grade aerobic biological process. The effluent of the reformed system can meet the requirements of first grade standards of national sewage discharge with the COD 69 mg/L, colority 40 multiple and SS 17 mg/L.

Key words: printing and dyeing wastewater, anoxic/two-grade aerobic process, biorefractory wastewater