污泥活性炭的制备及其对含磷污水的吸附研究  

Preparation of sludge-based activated carbon and its application for phosphorus adsorption

作　　者：贺自帅 李海涛 高红[2] HE Zishuai;LI Haitao;GAO Hong(YuXi Agriculture Vocation-Technical College,Yuxi 653100,China;Facult of Architectural Engineering,Kunming University of Science and Technology,Kunming 650500,China)

机构地区：[1]玉溪农业职业技术学院,云南玉溪653100 [2]昆明理工大学建筑工程学院,云南昆明650500

出　　处：《工业水处理》2024年第12期138-146,共9页Industrial Water Treatment

基　　金：云南省教育厅科研项目(2023J1843)。

摘　　要：以脱水污泥与消化污泥为原料,采用ZnCl_(2)、H_(2)SO_(4)、KOH为活化剂制备污泥活性炭,以碘吸附值为评价指标,结果表明:以ZnCl_(2)为活化剂制备出的脱水污泥活性炭(TSAC)和消化污泥活性炭(XHAC)的碘吸附值最高,分别为355.1 mg/g和289.2 mg/g。将TSAC和XHAC应用于含磷污水的吸附并与商业活性炭(CAC)进行比较,探究了吸附时间、投加量、pH对磷吸附量的影响,对污泥和TSAC中的重金属化学形态和生态风险进行分析,采用SEM、XRD、FT-IR和BET等表征手段对吸附机理进行分析,结果表明:当吸附时间为360 min,pH为6时,TSAC和XHAC对磷的吸附量分别为7.3 mg/g和6.8 mg/g,高于CAC对磷的吸附量(4.1 mg/g);吸附过程符合Langmuir模型和伪二级动力学方程,为单分子层表面的化学吸附;TSAC的重金属潜在生态风险为低生态风险,而污泥为中等生态风险,通过热解污泥制备污泥活性炭能够实现重金属稳定化。Dehydrated sludge and digested sludge were used as raw materials,ZnCl_(2),H_(2)SO_(4) and KOH were used as activators to prepare sludge biochar,with iodine adsorption value as the evaluation index.The results showed that the dehydrated sludge biochar(TSAC)and digested sludge biochar(XHAC)prepared with ZnCl_(2) as activator had the highest iodine adsorption values of 355.1 mg/g and 289.2 mg/g,respectively.TSAC and XHAC were applied to phosphorus containing wastewater and compared with commercial activated carbon(CAC).The effects of adsorption time,dosage,and pH on phosphorus adsorption were investigated,and the chemical forms and ecological risks of heavy metals in sludge and TSAC were analyzed.The adsorption mechanism was explored with SEM,XRD,FT-IR,and BET.The results showed that when the adsorption time was 360 min and pH of 6,the adsorption capacity of TSAC and XHAC for phosphorus was 7.3 mg/g and 6.8 mg/g,which was higher than the adsorption capacity of commercial activated carbon(4.1 mg/g).The adsorption process conformed to the Langmuir model and pseudo second-order kinetic equation,and was a chemical adsorption on the surface of a single molecular layer.The potential ecological risk of heavy metals in TSAC was low,while that for sludge was medium,which indicated that the morphological stabilization of heavy metals could be achieved by preparing sludge activated carbon from pyrolysis sludge.

关 键 词：污泥活性炭 磷吸附 重金属生态风险 

分 类 号：X703.1[环境科学与工程—环境工程]