中文摘要：

摘要针对制革废水高COD、高总氮的问题，提出了基于上流式厌氧污泥床（UASB）、上流式反硝化污泥床（UDNSB）、生物接触氧化池的生物处理组合工艺，进行了为期321d的现场中试研究。研究结果表明，对于COD、TN、NH4＋-N平均浓度分别为2740、278和193mg·L-1的制革废水，在硝化液回流比R为300％，UASB反应器、UDNSB反应器、生物接触氧化池的水力停留时间（HRT）分别为11、22和57h，平均容积负荷分别为5．63kgCOD·（m3·d）-1、0．30kgTN·（m3·d）-1和0．11kgNH4＋-N·（m3·d）-1的条件下，该组合工艺处理出水COD、TN和NH4＋-N的平均浓度分别为190、69．8和4．6mg·L-1，其平均去除率分别达到92％、73％和97％以上。

英文摘要：

Tannery wastewater is characterized by high concentrations of chemical oxygen demand （COD） and total nitrogen （TN）. In this study, a combined biological treatment process based on an up-flow anaerobic sludge blanket （UASB）, an up-flow denitrification sludge blanket （UDNSB）, and a biological contact oxidation pond was proposed to treat tannery wastewater. A pilot wastewater treatment system was operated for 321 days, with ef- ficient removal rates of COD, TN, and NH4＋ -N. The hydraulic retention times （HRTs） of the UASB, UDNSB, and biological contact oxidation pond were 11, 22, and 57 h, respectively, and the corresponding volumetric loadings were 5.63 kg COD · （m3 · d） -1, 0. 30 kg TN · （m3 · d） -1, and 0. 11 kg NH4＋-N - （m3 · d） -1, with a nitrification liquid reflux ratio （R） of 300%. Average concentrations of COD, TN, and NH4＋ -N in the tan- nery wastewater were 2 740, 278, and 193 mg · L-1, respectively. After the combined biological treatment, the average concentrations of COD, TN, and NH4 ＋-N in the final effluent were 190, 69.8, and 4.6 mg · L-1, with removal rates of more than 92% , 73% , and 97% , respectively.