研究催化剂对污泥微波热解过程中重金属固定效率和机制的影响。
Study on the effects of catalysts on the immobilization efficiency and mechanism of heavy metals during the microwave pyrolysis of sludge.
机构信息
College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, China; Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China.
College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, China.
出版信息
Waste Manag. 2018 Jul;77:131-139. doi: 10.1016/j.wasman.2018.04.046. Epub 2018 May 12.
In order to enhance the immobilization of heavy metals in the bio-char during microwave pyrolysis, the immobilization efficiency and mechanism of heavy metals in the microwave pyrolysis of sludge with different alkaline catalysts were explored. Results showed that the leaching concentrations of heavy metals reduced greatly after pyrolysis, which were lower when catalyzed by CaO than those of FeO. CaO was more favorable for the immobilization of Cr, Cu, Zn, Pb and Ni while FeO was more favorable for Cd. Different species distributions of heavy metals in the bio-char affected the leaching concentrations. Adding catalyst could significantly reduce the ecological risks of heavy metals in the bio-char, and CaO (RI = 15.17-20.43) had a better performance than FeO (RI = 16.88-21.79). When catalyzed by CaO, the formation of pores and co-crystal compounds in the bio-char determined the immobilization efficiencies of heavy metals.
为了提高重金属在生物炭中的固定化效率，研究了不同碱性催化剂对污泥微波热解过程中重金属固定化效率和机理的影响。结果表明，热解后重金属的浸出浓度大大降低，其中 CaO 催化时的重金属浸出浓度低于 FeO。CaO 更有利于 Cr、Cu、Zn、Pb 和 Ni 的固定化，而 FeO 则更有利于 Cd 的固定化。重金属在生物炭中的不同形态分布影响浸出浓度。添加催化剂可显著降低生物炭中重金属的生态风险，其中 CaO（RI=15.17-20.43）的性能优于 FeO（RI=16.88-21.79）。当用 CaO 催化时，生物炭中孔和共晶化合物的形成决定了重金属的固定化效率。
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