ABSTRACT

A packed-bed anaerobic-aerobic reactor (PBAOR) with two anaerobic and two aerobic compartments was constructed to treat manure-free piggery wastewater which was characterized by high ammonium (NH4⁺-N) and low ratio of chemical oxygen demand (COD) to total nitrogen (TN). Performed for 60 days at the normal atmospheric temperature of 25 °C with a constant hydraulic retention time of 32 h and reflux ratio of 2.0, a stable state in pollutants removal was obtained in the PBAOR. Within the next routine operation process, the removal of COD, NH4⁺-N and TN was above 85.7%, 98.2% and 85.8%, with a residual less than 81.7, 7.2 and 39.9 mg L⁻¹ in effluent, respectively. Twelve veterinary antibiotics classified into tetracyclines (TCs), sulphonamides (SAs) and fluoroquinolones (FQs) were detected from the piggery wastewater. The PBAOR was effective in removing TCs and SAs with an average removal of 74.8% and 93.3%, respectively, but presented a negative removal for FQs. Most COD in the piggery wastewater was mainly removed in the first two anaerobic compartments along with an obvious removal of TCs and SAs, while the TN were mainly removed in the last two aerobic compartments with the negative removal of FQs.

摘要

构建了具有两个厌氧和两个好氧隔室的填充床厌氧-好氧反应器 (PBAOR) 来处理以高铵 (NH4 + -N) 和低化学需氧量 (COD) 为特征的无粪猪场^废水。总氮（TN）。在 25°C 的正常大气温度下以 32 小时的恒定水力停留时间和 2.0 的回流比进行 60 天，在 PBAOR 中获得稳定的污染物去除状态。^{在接下来的常规操作过程中，COD、NH4 +} -N和TN的去除率分别在85.7%、98.2%和85.8%以上，残留量分别小于81.7、7.2和39.9 mg L ^-1在流出物中，分别。从猪场废水中检测到 12 种兽用抗生素，分为四环素类 (TCs)、磺胺类 (SAs) 和氟喹诺酮类 (FQs)。PBAOR 可有效去除 TC 和 SA，平均去除率分别为 74.8% 和 93.3%，但对 FQ 呈现负去除效果。猪场废水中大部分COD主要在前两个厌氧室去除，TCs和SAs明显去除，而TN主要在后两个好氧室去除，FQs去除负。