两种制革废水生化处理组合工艺的效能比较

 借助于实际工程的运行,比较了水解酸化与序批式活性污泥法(SBR)组合工艺(H-SBR)和接触氧化与SBR组合工艺(O-SBR)两套设施处理制革废水的效能。结果表明,接触氧化与SBR组合工艺能有效处理制革废水,在接触氧化HRT 24h、SBR曝气5-7h的条件下,COD和氨氮平均去除率可分别达到83%和74%,出水平均浓度分别为273和42mg/L。采用水解酸化与SBR的组合工艺对预处理后的制革废水进行处理,在水解酸化HRT 24h、SBR曝气5-7h的条件下,COD和氨氮平均去除率分别仅为70%和5%,虽然COD可降低到500mg/L以下,但氨氮高达163mg/L左右,且需配套臭气处理设施。

Efficiency Evaluation of Two Combined Processes for Treating Tannery Wastewater

Two processes used to treat organic wastewater discharged from a tannery are discussed and their treatment efficiencies are compared. The results show that the process of sequencing the batch reactor (SBR) combined with the contact oxidation (O-SBR) is more realistic than that of SBR combined with the hydrolysis acidification (H-SBR). With HRT contact oxidation for 24h and sewage aeration for 5-7h in the SBR, the average removal of 83% for COD and 74% for ammonia are achieved in the O-SBR process. The COD and ammonia in the effluent of the O-SBR process are about 273mg/L and 42mg/L, respectively. With HRT contact oxidation for 24h and the same sewage aeration in the SBR, the average removal of COD and ammonia are only 70% and 5%, respectively, in the H-SBR process. Though the COD is less than 500 mg/L, the ammonia is as high as 163mg/L in the effluent. Furthermore, an attached process to the H-SBR has to be constructed for fetor collection, transfer and treatment.