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为降低污水污泥中药理活性化合物(Ph ACs)产生的环境风险,利用生物方法强化污泥厌氧消化,提高其去除效果。以氯贝酸(CFA)、三氯生(TCS)、双氯芬酸(DCF)、卡马西平(CBZ)4种典型的Ph ACs为目标污染物,利用气相色谱-质谱联用仪(GC-MS)定量分析污泥中的目标物,探究外加生物酶联合污泥厌氧消化法强化对Ph ACs的作用效果。结果表明,随着SRT(污泥停留时间)的增大,目标物的去除效率有一定程度的增大,特别是高温条件下,当SRT由7d增至20d时,CFA的去除率增长了45%;木瓜蛋白酶对中高温系统中CBZ的去除效果最佳,分别为63.8%和67.5%,同时对4种目标物总的去除率最高,分别为57.3%和61.8%;添加溶菌酶的试验中,4种目标物去除效果差异较大,中温、高温系统中对TCS的去除效果最佳为81.7%和80.9%,去除效果最差的是CBZ,去除率为40.4%和33.5%;纤维素酶处理中,4种目标物的去除率均小于60%。混合生物酶试验中,高温条件下更易去除Ph ACs。研究显示,生物酶强化污泥厌氧消化能有效去除污水污泥中的Ph ACs。
In order to reduce the environmental risk caused by pharmacologically active compounds (Ph ACs) in sewage sludge, biological methods are used to enhance sludge anaerobic digestion and improve its removal efficiency. Four typical Ph ACs, such as CFA, TCS, DCF and CBZ, were selected as target pollutants and their chemical constituents were identified by gas chromatography-mass spectrometry (GC-MS) Quantitative analysis of the target substance in the sludge to explore the combined effect of biochemical enzyme and sludge anaerobic digestion enhanced Ph ACs effect. The results showed that with the increase of SRT (sludge residence time), the removal efficiency of target increased to some extent. Especially when the SRT was increased from 7d to 20d, the removal efficiency of CFA increased by 45 %. The removal of CBZ by papain was the best at 63.8% and 67.5%, respectively, while the total removal rates of the four target compounds were the highest (57.3% and 61.8%, respectively). During the addition of lysozyme , The removal efficiencies of the four target species were quite different. The best TCS removal efficiency was 81.7% and 80.9% in the medium temperature and high temperature system, and the CBZ removal efficiency was the worst, with the removal rates of 40.4% and 33.5% In the treatment, the removal rates of the four kinds of targets are less than 60%. In mixed bio-enzyme assays, Ph ACs are easier to remove under high temperature conditions. Studies have shown that anaerobic digestion of bio-enzyme-enhanced sludge can effectively remove Ph ACs from sewage sludge.