ABSTRACT

The aim of the work was to assess the efficiency of ozonation and ozonation in combination with H₂O₂ in jet loop reactor to increase biotreatability of persistent veterinary antibiotic Tiamulin. The efficiency of oxidative processes was monitored by combined approach based on determination of efficiency of wastewater treatment and impact to waste sludge stabilization. Degradation of Tiamulin in model wastewater (100 mg L⁻¹) during oxidation was followed by COD and DOC measurements while changes in biodegradability were determined by respirometric measurements. Biogas production potential was also determined to identify problems related to anaerobic digestion of waste sludge resulted in treatment of Tiamulin-contaminated wastewater. At ozone dose of 69 g_ozone g_COD⁻¹ and 220 g_ozone g_DOC⁻¹removal for COD and DOC was 26% and 17%, respectively. Better biotreatability was confirmed by respirometric testing. H₂O₂ addition did not improve removal efficiency (11–13%). The second stage of nitrification was suppressed by the addition of Tiamulin and ozonation again recovered $\mathrm{N}\text{-}{\mathrm{NO}}_3^{-}$ formation. O₃/H₂O₂ treated sample reduced the nitrification, especially formation of $\mathrm{N}\text{-}{\mathrm{NO}}_2^{-}$ in the first phase of the process. Simultaneously, quadratic model was developed to describe the relationship between oxygen uptake rate and changes in ammonium nitrogen concentration due to the oxidative treatment. The positive impact of ozone was also confirmed by ozonation of Tiamulin-contaminated (400 mg L⁻¹) waste sludge where biogas production potential was increased for 6-times. Combination of approaches confirmed, that O₃ effectively increase the treatability of Tiamulin in wastewater and sludge while addition of the hydrogen peroxide generally did not improve the performance of the processes.

摘要

这项工作的目的是评估臭氧化和臭氧化与 H ₂ O ₂组合在喷射回路反应器中的效率，以提高持久性兽用抗生素 Tiamulin 的生物可处理性。在确定废水处理效率和对废污泥稳定化的影响的基础上，采用组合方法监测氧化过程的效率。在氧化过程中模型废水（100 mg L ^-1）中的Tiamulin降解后进行COD和DOC测量，而生物降解性的变化通过呼吸测量来确定。还确定了沼气生产潜力，以确定与厌氧消化废污泥相关的问题，从而处理被 Tiamulin 污染的废水。臭氧剂量为 69 g_臭氧g _COD ^-1和 220 g_臭氧g _DOC ^-1对 COD 和 DOC 的去除率分别为 26% 和 17%。呼吸测量测试证实了更好的生物可治疗性。添加H ₂ O ₂并没有提高去除效率（11-13%）。加入泰妙菌素可抑制第二阶段的硝化作用，并再次恢复臭氧作用$\mathrm{ñ}\text{-}{\mathrm{不}}_3^{-}$形成。O ₃ /H ₂ O ₂处理的样品减少了硝化作用，尤其是$\mathrm{ñ}\text{-}{\mathrm{不}}_2^{-}$在该过程的第一阶段。同时，建立了二次模型来描述氧吸收率与氧化处理引起的铵态氮浓度变化之间的关系。臭氧的积极影响也通过对 Tiamulin 污染的 (400 mg L ^-1 ) 废污泥进行臭氧化得到证实，其中沼气生产潜力增加了 6 倍。方法的组合证实，O ₃有效地提高了泰妙菌素在废水和污泥中的可处理性，而添加过氧化氢通常不会提高工艺的性能。