Pyrolytic valorization of water treatment residuals containing powdered activated carbon as multifunctional adsorbents.,Chemosphere

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Pyrolytic valorization of water treatment residuals containing powdered activated carbon as multifunctional adsorbents.
Chemosphere ( IF 8.1 ) Pub Date : 2020-03-31 , DOI: 10.1016/j.chemosphere.2020.126641
Ye-Eun Lee ₁ , Dong-Chul Shin ₁ , Yoonah Jeong ₁ , I-Tae Kim ₁ , Yeong-Seok Yoo ₁

Affiliation

This study investigated the possibility of applying pyrolysis as an alternative method to recycle powdered activated carbon-containing water treatment residuals (PAC-WTRs) discharged from the Cheongju water treatment plant as a multifunctional adsorbent. WTRs pyrolyzed for 1 h at 200-700 °C were compared with raw material. The carbon content of the PAC-WTR reaches 19.27%, with about 25% Al and 17% Si. Changes in PAC through pyrolysis imparted new adsorbent properties to WTR. As the pyrolysis temperature increased, the purity of PAC increased, and pores were regenerated to recover the Brunauer-Emmett-Teller (BET) from 6.5 m2 g-1 to 131.8 m2 g-1. In addition, the basicity increased as the carboxylic and phenolic groups on the carbon surface were decomposed, which increased the cation (methylene blue) adsorption capacity and reduced heavy metal leaching. As the coagulant regenerated with increasing pyrolysis temperature, the amount of aluminum leached and phosphate removal efficiency were increased. In the case of simultaneous removal of cations (MB+) and anions (PO43-), the removal efficiency was higher than that for single adsorption without competition through multi-layer adsorption by Al complex and PAC complex. Therefore, the pyrolyzed PAC-WTR is capable of adsorbing and removing anions and cations simultaneously without the peril of substance leaching. The regenerated WTRs containing PAC is expected to be utilized as a multi-functional remediation material for wastewater containing various pollutants.

中文翻译：

含有粉末状活性炭作为多功能吸附剂的水处理残渣的热解增值。

这项研究调查了使用热解作为替代方法的可能性，该方法可以回收清州水处理厂排放的粉状含活性炭的水处理残渣（PAC-WTR）作为多功能吸附剂。将WTR在200-700°C下热解1小时与原料进行了比较。PAC-WTR的碳含量达到19.27％，其中Al含量约25％，Si含量约17％。通过热解PAC的变化赋予了WTR新的吸附性能。随着热解温度的升高，PAC的纯度提高，并且孔再生，将Brunauer-Emmett-Teller（BET）从6.5 m2 g-1恢复到131.8 m2 g-1。此外，随着碳表面上的羧基和酚基分解，碱度增加，从而增加了阳离子（亚甲基蓝）的吸附能力并减少了重金属的浸出。随着凝结剂随着热解温度的升高而再生，铝的浸出量和除磷效率提高。在同时去除阳离子（MB +）和阴离子（PO43-）的情况下，去除效率高于单吸附，而铝配合物和PAC配合物的多层吸附没有竞争。因此，热解的PAC-WTR能够同时吸附和除去阴离子和阳离子，而不会造成物质浸出的危险。含有PAC的再生WTR有望用作含有各种污染物的废水的多功能修复材料。增加了铝的浸出量和除磷效率。在同时去除阳离子（MB +）和阴离子（PO43-）的情况下，去除效率高于单吸附，而铝配合物和PAC配合物的多层吸附没有竞争。因此，热解的PAC-WTR能够同时吸附和除去阴离子和阳离子，而不会造成物质浸出的危险。含有PAC的再生WTR有望用作含有各种污染物的废水的多功能修复材料。增加了铝的浸出量和除磷效率。在同时去除阳离子（MB +）和阴离子（PO43-）的情况下，去除效率高于单吸附，而铝配合物和PAC配合物的多层吸附却没有竞争。因此，热解的PAC-WTR能够同时吸附和除去阴离子和阳离子，而不会造成物质浸出的危险。含有PAC的再生WTR有望用作含有各种污染物的废水的多功能修复材料。Al配合物和PAC配合物的多层吸附作用，其吸附效率高于单吸附，没有竞争。因此，热解的PAC-WTR能够同时吸附和除去阴离子和阳离子，而不会造成物质浸出的危险。含有PAC的再生WTR有望用作含有各种污染物的废水的多功能修复材料。Al配合物和PAC配合物的多层吸附作用，其吸附效率高于单吸附，没有竞争。因此，热解的PAC-WTR能够同时吸附和除去阴离子和阳离子，而不会造成物质浸出的危险。含有PAC的再生WTR有望用作含有各种污染物的废水的多功能修复材料。

更新日期：2020-03-31

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