生物合成羟基硫酸铁矿物催化类Fenton反应改善精对苯二甲酸(PTA)化工污泥脱水性能研究  

Improvement of purified terephthalic acid sludge dewaterability by Fenton-like reactions catalysed with biosynthetic hydroxyferric sulfate minerals

作　　者：申祖武 罗浩伟 郭泽浩 杨俊[2,3] 宋永伟[1,2] SHEN Zuwu;LUO Haowei;GUO Zehao;YANG Jun;SONG Yongwei(Modern Technology Convergence and Engineering Management Research Center,Zhongnan University of Economics and Law,Wuhan 430073;Department of Environmental Science and Engineering,Zhongnan University of Economics and Law,Wuhan 430073;Institute of Environmental Management and Policy,Zhongnan University of Economics and Law,Wuhan 430073)

机构地区：[1]中南财经政法大学现代技术融合与工程管理研究中心,武汉430073 [2]中南财经政法大学环境科学与工程系,武汉430073 [3]中南财经政法大学环境管理与政策研究所,武汉430073

出　　处：《环境科学学报》2024年第10期298-307,共10页Acta Scientiae Circumstantiae

基　　金：国家自然科学基金(No.21906183);中南财经政法大学中央高校基本科研业务费专项资金(No.202451417)。

摘　　要：精对苯二甲酸(PTA)污泥有机质含量极高使得污泥脱水极其困难,泥饼含水率过高导致焚烧成本高昂,设法实现该污泥的深度脱水对后续处置十分重要.本研究选择生物合成羟基硫酸铁矿物作为类Fenton催化剂,考察其介导的催化类Fenton反应在改善PTA污泥脱水性能上的可行性,通过关键参数优化强化PTA污泥脱水性能并探究其机理,最后采用中试设备评估该方法的稳定性.结果表明,生物合成羟基硫酸铁矿物为施氏矿物和黄钾铁矾的混合物,化学式可表示为K_(0.01)Fe_(3)(SO_(4))_(0.39)(OH)_(8.23).羟基硫酸铁矿物介导的催化类Fenton反应可有效改善PTA污泥脱水性能,最佳反应条件为:污泥初始pH值4.0,H_(2)O_(2)浓度为4.5 g·L^(-1),矿物含量为4.0 g·L^(-1),反应时间为30 min.经改性后,PTA污泥比阻(SRF)从初始的57.84×10^(12)m·kg^(-1)下降至2.21×10^(12)m·kg^(-1),污泥中紧密粘附EPS(TB-EPS)浓度从385.1 mg·L^(-1)下降至232.7 mg·L^(-1),结合水含量从6.57 g·g^(-1)下降至3.19 g·g^(-1).连续22批次的中试结果表明,相比生物沥浸法,羟基硫酸铁矿物催化类Fenton氧化法不仅可以进一步提高PTA污泥处理能力,还可实现污泥高干度脱水.研究结果可为羟基硫酸铁矿物催化类Fenton氧化法在PTA污泥处理中的应用提供理论指导和技术支持.The extremely high organic matter content of purified terephthalic acid(PTA)sludge poses significant challenges for dewatering,leading to elevated incineration costs due to the high moisture content in the sludge cake.Achieving thorough dewatering of the sludge is essential for its subsequent disposal.In this study,biosynthetic hydroxyferric sulfate minerals were selected as catalysts to investigate the feasibility of Fenton-like reactions in improving the dewaterability of PTA sludge.Simultaneously,optimal conditions for improving the dewaterability of PTA sludge were determined by optimizing key parameters,and the stability of this method was assessed using pilot equipment.The findings revealed that the biosynthetic hydroxyferric sulfate minerals consist of a mixture of schwertmannite and jarosite,with a chemical formula represented as K_(0.01)Fe_(3)(SO_(4))_(0.39)(OH)_(8.23).The optimal conditions for the Fenton-like reaction catalyzed with hydroxyferric sulfate minerals to enhance the dewaterability of PTA sludge were as follows:initial pH=4.0,H_(2)O_(2)4.5 g·L^(-1),mineral 4.0 g·L^(-1),and reaction time 30 minutes.Under the optimal conditions,the specific resistance filtration(SRF)of PTA sludge decreased from the initial 57.84×10^(12)m·kg^(-1)to 2.21×10^(12)m·kg^(-1),the concentration of tightly bound EPS(TB-EPS)decreased from 385.1 mg·L^(-1)to 232.7 mg·L^(-1),and the bound water content decreased from 6.57 g·g^(-1)to 3.19 g·g^(-1),respectively.Pilot test results from 22 consecutive batches demonstrated that compared to the sludge bioleaching method,the Fenton-like oxidation method catalyzed with hydroxyferric sulfate minerals not only enhances the treatment capacity of PTA sludge but also achieves significantly higher dewatering dryness of the sludge.Thisresearch offers theoretical guidance and technical support for the application of the hydroxyferric sulfate minerals-catalyzed Fenton-like oxidationmethod in PTA sludge treatment.

关 键 词：羟基硫酸铁矿物 催化剂 类FENTON PTA污泥 脱水性能 

分 类 号：X703[环境科学与工程—环境工程]