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Investigation of polycyclic aromatic hydrocarbons (PAHs) formed in three-phase products from the pyrolysis of various wastewater sewage sludge.
Journal of Hazardous Materials ( IF 12.2 ) Pub Date : 2020-01-10 , DOI: 10.1016/j.jhazmat.2020.122045
Yanjun Hu 1 , Yuanyuan Xia 1 , Francesco Di Maio 2 , Fan Yu 1 , Wenjing Yu 1
Affiliation  

This study investigated the presence and concentration of 16 U.S. EPA priority controlled PAHs in gas, bio-oil and residues from the pyrolysis of different sewage sludges. We studied the temperature as a key influential factor for the formation of 16 targets PAHs and the effect of sludge source on the distribution of different molecules' PAHs were analyzed. Results showed that most of the 16 PAHs were formed during sludge pyrolysis and mainly ended up in bio-oil and gas. The distribution of PAHs in bio-oil was mostly dependent on pyrolysis temperature. With the increase of pyrolysis temperature from 450℃ to 850℃, it has been observed an increase of PAHs concentration in the bio-oils as follows: 16 % (ISS), 1.3 % (food manufacture wastewater sludge, FSS), 194 % (printing and dyeing wastewater sludge, PDSS), 334 % (DSS). 2, 3 and 4-ring PAHs dominate, and their total mass proportion is over 70 %. In gas, the types and concentrations of PAHs were less than in bio-oil. PAHs yield in solid was very low, and a trace content of PAHs of 0.0161 mg kg-1 was detected from the solid after the pyrolysis of DSS, while PAHs in solid for ISS and FSS are even non-existent and would cause fewer environmental problems.

中文翻译:

对各种废水污泥进行热解后在三相产物中形成的多环芳烃的研究。

这项研究调查了16种美国EPA优先控制的PAH在不同污水污泥热解产生的气体,生物油和残余物中的存在和浓度。我们研究了温度作为形成16种目标PAHs的关键影响因素,并分析了污泥源对不同分子PAHs分布的影响。结果表明,16种多环芳烃中的大多数是在污泥热解过程中形成的,主要以生物油和天然气为最终产物。PAHs在生物油中的分布主要取决于热解温度。随着热解温度从450℃增加到850℃,已观察到生物油中PAHs浓度的增加如下:ISS(16%),食品制造废水污泥(FSS)1.3%,194%(食品制造废水污泥)。印染废水污泥(PDSS),334%(DSS)。2,3环和4环PAH占主导地位,它们的总质量比例超过70%。在气体中,PAHs的类型和浓度低于生物油中的PAHs。固体中的PAHs产量非常低,在DSS裂解后,从固体中检测到痕量的PAHs为0.0161 mg kg-1,而ISS和FSS的固体中PAHs甚至不存在,将减少环境问题。
更新日期:2020-01-11
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