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Effect of pyrolysis temperature on removal of organic pollutants present in anaerobically stabilized sewage sludge
Chemosphere ( IF 8.8 ) Pub Date : 2020-11-23 , DOI: 10.1016/j.chemosphere.2020.129082
Jaroslav Moško , Michael Pohořelý , Tomáš Cajthaml , Michal Jeremiáš , Ana A. Robles-Aguilar , Siarhei Skoblia , Zdeněk Beňo , Petra Innemanová , Lucie Linhartová , Klára Michalíková , Erik Meers

Sewage sludge was excluded from the list of component materials for the production of EU fertilizing products and it was banned as feedstock to produce pyrolysis & gasification materials in European Commission’s technical proposals for selected new fertilizing materials under the Regulation 2019/1009 (STRUBIAS report). This exclusion of pyrolysis as a viable way to treat sewage sludge was mainly due to the lack of data on the fate of organic pollutants at pyrolysis conditions. In this work, we are addressing this knowledge gap. We studied slow pyrolysis as a potential process to efficiently treat organic pollutants present in stabilized sewage sludge. Sewage sludge was pyrolyzed in a quartz fixed bed reactor at temperatures of 400–800 °C for 2 h and the sludge and resulting sludge-chars were analyzed for the presence of four groups of organic pollutants, namely (i) polychlorinated biphenyls (PCBs), (ii) polycyclic aromatic hydrocarbons (PAHs), (iii) pharmaceuticals, and (iv) endocrine-disrupting and hormonal compounds. Pyrolysis at ≥ 400 °C effectively removed pharmaceuticals (group iii) to below detection limits, whereas pyrolysis at temperatures higher than 600 °C was required to remove more than 99.8% of the compounds from groups i, ii and iv. Based on these findings, we propose, that high temperature (>600 °C) slow pyrolysis can satisfactory remove organic pollutants from the resulting sludge-char, which could be safely applied as soil improver.



中文翻译:

热解温度对厌氧稳定污泥中有机污染物去除的影响

污泥被排除在生产欧盟肥料产品的组成材料清单之外,并且在欧盟委员会根据2019/1009法规(STRUBIAS报告)针对某些新型肥料的技术建议中被禁止用作生产热解和气化材料的原料。排除热解作为处理污水污泥的可行方法的主要原因是缺乏关于热解条件下有机污染物结局的数据。在这项工作中,我们正在解决这一知识鸿沟。我们研究了缓慢热解作为有效处理稳定污泥中存在的有机污染物的潜在过程。污水污泥在石英固定床反应器中在400–800°C的温度下热解2 h,并对污泥和所得污泥进行四类有机污染物的分析,即(i)多氯联苯(PCBs) ,(ii)多环芳烃(PAH),(iii)药物和(iv)破坏内分泌的激素化合物。在≥400°C的条件下进行热解可将药物(iii组)有效地去除至检测限以下,而在高于600°C的温度下进行热解则需要从i,ii和iv组中去除99.8%以上的化合物。根据这些发现,我们提出,高温(> 600°C)缓慢热解可以令人满意地从产生的污泥炭中去除有机污染物,可以安全地用作土壤改良剂。即(i)多氯联苯(PCBs),(ii)多环芳烃(PAH),(iii)药物和(iv)破坏内分泌和激素的化合物。在≥400°C的条件下进行热解可将药物(iii组)有效地去除至检测限以下,而在高于600°C的温度下进行热解则需要从i,ii和iv组中去除99.8%以上的化合物。根据这些发现,我们提出,高温(> 600°C)缓慢热解可以令人满意地从产生的污泥炭中去除有机污染物,可以安全地用作土壤改良剂。即(i)多氯联苯(PCBs),(ii)多环芳烃(PAH),(iii)药物和(iv)破坏内分泌和激素的化合物。在≥400°C的条件下进行热解可将药物(iii组)有效地去除至检测限以下,而在高于600°C的温度下进行热解则需要从i,ii和iv组中去除99.8%以上的化合物。根据这些发现,我们提出,高温(> 600°C)缓慢热解可以令人满意地从产生的污泥炭中去除有机污染物,可以安全地用作土壤改良剂。而需要在高于600°C的温度下进行热解,以从第i,ii和iv组中去除99.8%以上的化合物。根据这些发现,我们提出,高温(> 600°C)缓慢热解可以令人满意地从产生的污泥炭中去除有机污染物,可以安全地用作土壤改良剂。而需要在高于600°C的温度下进行热解,以从第i,ii和iv组中去除99.8%以上的化合物。基于这些发现,我们提出,高温(> 600°C)缓慢热解可以令人满意地从产生的污泥炭中去除有机污染物,可以安全地用作土壤改良剂。

更新日期:2020-11-23
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