摘要
为提高污泥生物质炭品质,拓展污泥生物炭高值化应用前景,探究了市政污泥与小麦秸秆协同炭化下生物炭性质的变化规律。研究结果表明,随着小麦秸秆添加量的增大,生物炭的碳含量显著增大,生物炭H/C、O/C和N/C逐渐降低,同时生物炭的pH、有机质、总氮及总钾含量呈增加趋势,生物炭的总磷含量随着小麦秸秆添加量的增加呈递减趋势;当小麦秸秆的添加比例为20%时,生物炭的EC值达到最高,为3.75 mS/cm;随着小麦秸秆添加量的增加,生物炭中的Cu、Zn、Pb和Cd总量和有效性也有不同程度的降低,当小麦秸秆的添加比例为50%时,Cu、Zn、Pb和Cd总量降低了27.52%~55.71%,而有效态Cu、Zn、Pb和Cd降低了45.04%~124.75%。因此,市政污泥与小麦秸秆协同炭化能够有效改善了生物炭的养分含量,降低了其重金属生态风险,为进一步拓展和高值化利用污泥生物炭提供了数据支撑。
To enhance the quality of sludge-derived biochar and expand the prospects for high-value applications of sludge biochar,this paper investigates the variation of biochar properties during the co-carbonization of municipal sludge with wheat straw.The results showed that as the amount of added wheat straw increased,the carbon content of the biochar significantly increased,while the H/C,O/C,and N/C ratios gradually decreased.Additionally,the pH,organic matter,total nitrogen,and total potassium content of the biochar showed an increasing trend,whereas the total phosphorus content decreased with the increase in wheat straw addition.When the addition ratio of wheat straw was 20%,the EC value of the biochar reached its maximum at 3.75 mS/cm.As the amount of added wheat straw increased,the total and available contents of Cu,Zn,Pb,and Cd in the biochar also decreased to varying degrees.At a 50%addition ratio of wheat straw,the total contents of Cu,Zn,Pb,and Cd decreased by 27.52%~55.71%,while the available contents of these heavy metals decreased by 45.04%~124.75%.Therefore,the co-pyrolysis of municipal sludge and wheat straw effectively improved the nutrient content of the biochar and reduced its heavy metal ecological risk,providing data support for further expansion and high-value utilization of sludge biochar.
作者
徐汝民
刘程
陈涛
XU Rumin;LIU Cheng;CHEN Tao(Anhui Tongyuan Environment Energy Saving Co.,Ltd.,Hefei 230031,China;Municipal Sludge Disposal and Resource Utilization Engineering Research Center,Hefei 230031,China)
出处
《应用化工》
北大核心
2025年第8期2056-2060,2068,共6页
Applied Chemical Industry
基金
安徽省重点研究与开发计划项目(2023t07020011)。
关键词
市政污泥
小麦秸秆
协同炭化
生物炭
理化特性
重金属生态风险
municipal sludge
wheat straw
co-carbonization
biochar
physicochemical properties
ecological risk of heavy metals
