The pyrolysis of coconut shell, coconut shell residue and de-ashed coconut shell residue was studied with the thermogravimetric technique, and the pyrolysis kinetics models were established.It was found that for cocon...The pyrolysis of coconut shell, coconut shell residue and de-ashed coconut shell residue was studied with the thermogravimetric technique, and the pyrolysis kinetics models were established.It was found that for coconut shell residue and de-ashed coconut shell residue, pyrolysis mainly occurred between 280—370℃, and there was only a single peak in their DTG curves.But in the case of raw coconut shell, two stages of 230—300℃ and 300—350℃, were involved in the pyrolysis process, which resulted in two peaks in the DTG curve.Apparent activation energies for the pyrolysis of these three materials were estimated, and the difference of apparent activation energies in the low temperature range was more evident than in the high temperature range and the highest reaction rate appeared in the high temperature stage.When used for making activated carbon, coconut shell residue and de-ashed coconut shell residue have more advantages than coconut shell.The pyrolysis temperature is in a narrow range.The pyrolysis process is easy to control and is noted for energy saving.展开更多
文摘污泥脱水是污泥处置的重要步骤,利用废物洁霉素药渣灰和聚丙烯酰胺(PAM)对污泥进行调理,根据污泥脱水性能的相关指标变化,探讨其对污泥脱水性能改善的效果及机理。研究结果表明,单独使用洁霉素药渣灰调理城市污泥,投加量为8 g/L时,污泥沉降比(SV)为51%,污泥比阻(SRF)减小28%;洁霉素药渣灰联合PAM使用时,比单独使用PAM的污泥可压缩性系数下降40.53%;污泥扫描电镜(SEM)图片表明,经过洁霉素药渣灰处理的污泥,污泥结构发生明显变化,能形成致密且具有相对较大孔径的絮体;污泥热重(TG-DTG)曲线显示,与原污泥相比,洁霉素药渣灰联合PAM调理污泥的脱水起始温度和热重峰明显前移,污泥脱水性能明显得到改善,在污泥最佳脱水条件下协同使用洁霉素药渣灰和PAM,8 kg洁霉素药渣灰相当于24 g PAM,但是二者的脱水机理不同。
文摘The pyrolysis of coconut shell, coconut shell residue and de-ashed coconut shell residue was studied with the thermogravimetric technique, and the pyrolysis kinetics models were established.It was found that for coconut shell residue and de-ashed coconut shell residue, pyrolysis mainly occurred between 280—370℃, and there was only a single peak in their DTG curves.But in the case of raw coconut shell, two stages of 230—300℃ and 300—350℃, were involved in the pyrolysis process, which resulted in two peaks in the DTG curve.Apparent activation energies for the pyrolysis of these three materials were estimated, and the difference of apparent activation energies in the low temperature range was more evident than in the high temperature range and the highest reaction rate appeared in the high temperature stage.When used for making activated carbon, coconut shell residue and de-ashed coconut shell residue have more advantages than coconut shell.The pyrolysis temperature is in a narrow range.The pyrolysis process is easy to control and is noted for energy saving.
