生物处理组合工艺用于制革废水处理

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321 d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2 740、278和193 mg·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57 h，平均容积负荷分别为5.63 kg COD·（m3·d）-1、0.30 kg TN·（m3·d）-1和0.11 kg NH4+-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4.6 mg·L-1，其平均去除率分别达到92%、73%和97%以上。

Tannery wastewater treatment with biological treatment combined process

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 efficient 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 tannery 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.