草木灰浸取液活化制备污泥基脱H2S碳材料研究

Study of the Preparation of Carbon Material for H2S Removing with the Extractive Solution of Plant Ash as Activator

以污水处理厂剩余污泥为原料,采用玉米棒灰浸取液代替化学活化剂热解污泥制备吸附碳材料,通过H 2S的穿透时间、碘值以及亚甲基蓝吸附值等指标确定样品的最佳制备条件。结果表明当污泥与玉米棒灰的质量比为1∶2,活化温度为600℃,N 2氛围下活化1.5 h所制得的碳材料具有最佳的脱臭性能,在出气H 2S浓度不超过30.0 mg·m^-3时,H 2S的穿透时间可达145 min,其脱臭性能远高于商品活性炭,此时亚甲基蓝吸附值和碘值分别为39.94 mg·g^-1和867.4 mg·g^-1;剩余污泥的热重分析说明碳材料孔的形成主要发生在178~600℃范围内,扫描电镜、孔结构和比表面积的表征显示材料表面粗糙,介孔发达;红外光谱显示出碳材料含氧、含氮官能团丰富,而这些因素均有利于H 2S气体的吸附脱除。

In this paper,the extractive solution of corn cob ash is used as activator instead of the traditional chemical activator for pyrolysis sewage treatment plant sludge to make adsorption of carbon materials.We determine the best preparation conditions of the sample by the indicators such as the penetration time of H 2S and the adsorbing capacity of iodine and methylene blue.It turns out that the material has the best deodorization efficiency,H 2S penetrating time can be 145 min much higher than commercially available activated carbon’s performance as the concentration of H 2S is no more than 30.0 mg·m^-3 iodine adsorbing 867.4 mg·g^-1 and methylene blue 39.94 mg·g^-1 when the quality of sludge and the corn cod ash ratio of 1∶2,the activation temperature at 600℃,1.5 hour accompany with N 2 atmosphere.Thermogravimetric analysis of excess sludge show that the formation of holes of sludge carbon material mainly occur in the range of 178℃~600℃;SEM and BET indicate that the material has rough surface developed mestopore structure,and FT-IR rich oxygen containing function groups.These characters are all conducive to remove and adsorb H 2S.