预处理对河道底泥固化效果的影响
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摘要
为了通过预处理改变底泥的理化性质,增加底泥固化后抗压强度,实现底泥的资源化利用,比较了3种底泥预处理方法(Fenton氧化、热处理、淋洗)对底泥中有机质的质量分数、重金属总质量、重金属形态分布,特别是对底泥固化后抗压强度的影响。结果表明:固化后抗压强度与底泥中有机质的质量分数直接相关;可降低底泥中有机质的质量分数的预处理方法(Fenton氧化、热处理)对提高底泥固化后抗压强度效果较好,底泥固化后抗压强度高达2.7 MPa;鼠李糖脂淋洗虽然能够有效去除底泥中的重金属,但是淋洗剂中的有机物反而使底泥中有机质的质量分数增加,对固化不利。因此,Fenton氧化和热处理均可用作提高底泥固化强度的预处理方法,且固化后试样重金属浸出毒性低,对环境影响小。
Due to its physical and chemical property changes through pre-treatments, effects of pretreatments including Fenton oxidation, heat treatment and washing on organic content, heavy metal content, heavy metal speciation and compressive strength after solidification were compared in this paper with the purpose of increasing the compressive strength of solidified sediment, which could realize the sediment reuse. The results showed that compressive strength of the solidified sediment was closely related to its organic content. Pretreatments, such as Fenton oxidation and heat treatment, which could reduce the organic content had the best effect on improving compressive strength. The highest compressive strength of 2.7 MPa could be reached. By comparison,rhamnolipid washing had effect on heavy metal removal. However, it resulted in the rising of organic content and thus had adverse effect on the solidification. Therefore, Fenton oxidation and heat treatment were recommended as the pretreatment to further increase the compressive strength.In addition, the solidified samples with low heavy metal leaching had less impact on the environment.
Due to its physical and chemical property changes through pre-treatments, effects of pretreatments including Fenton oxidation, heat treatment and washing on organic content, heavy metal content, heavy metal speciation and compressive strength after solidification were compared in this paper with the purpose of increasing the compressive strength of solidified sediment, which could realize the sediment reuse. The results showed that compressive strength of the solidified sediment was closely related to its organic content. Pretreatments, such as Fenton oxidation and heat treatment, which could reduce the organic content had the best effect on improving compressive strength. The highest compressive strength of 2.7 MPa could be reached. By comparison,rhamnolipid washing had effect on heavy metal removal. However, it resulted in the rising of organic content and thus had adverse effect on the solidification. Therefore, Fenton oxidation and heat treatment were recommended as the pretreatment to further increase the compressive strength.In addition, the solidified samples with low heavy metal leaching had less impact on the environment.
引文
[1]梁启斌,邓志华,崔亚伟.环保疏浚底泥资源化利用研究进展[J].中国资源综合利用, 2010, 28(12):23-26.
[2]刘贵云,姜佩华.河道底泥资源化的意义及其途径研究[J].东华大学学报(自然科学版), 2002, 28(1):33-36.
[3]PENG J F, SONG Y H, YUAN P, et al. The remediation of heavy metals contaminated sediment[J].Journal of Hazardous Materials, 2009, 161(2/3):633-640.
[4]PESONEN J, YLINIEMI J, LLLIKAINEN M, et al.Stabilization/solidification of fly ash from fluidized bed combustion of recovered fuel and biofuel using alkali activation and cement addition[J]. Journal of Environmental Chemical Engineering, 2016, 4(2):1759-1768.
[5]JING Z Z, JIN F M, YAMASAKI N, et al. Potential utilization of riverbed sediments by hydrothermal solidification and its hardening mechanism[J]. Journal of Environmental Management, 2009, 90(5):1744-1750.
[6]蒲凡,詹树林,赖俊英. NaOH对固化海涂淤泥强度和变形特性的影响研究[J].新型建筑材料, 2011, 38(5):9-12.
[7]SUTHERLAND R A. Loss-on-ignition estimates of organic matter and relationships to organic carbon in fluvial bed sediments[J]. Hydrobiologia, 1998, 389(1/2/3):153-167.
[8]中华人民共和国交通运输部. JTG E51—2009公路工程无机结合料稳定材料试验规程[S].北京：人民交通出版社，2009.
[9]TESSIER A, CAMPBELL P G C, BISSON M.Sequential extraction procedure for the speciation of particulate trace metals[J]. Analytical Chemistry, 1979,51(7):844-851.
[10]PéREZ-CID B, LAVILLA I, BENDICHO C.Comparison between conventional and ultrasound accelerated Tessier sequential extraction schemes for metal fractionation in sewage sludge[J]. Fresenius Journal of Analytical Chemistry, 1999, 363(7):667-672.
[11]国家环境保护总局. GB 5085.3—2007危险废物鉴别标准-浸出毒性鉴别[S].北京:中国环境出版社,2007.
[12]WANG L, TSANG D C W, POON C S. Green remediation and recycling of contaminated sediment by waste-incorporatedstabilization/solidification[J].Chemosphere, 2015, 122:257-264.
[13]PANDEY M, PANDEY A K, MISHRA A, et al.Assessment of metal species in river Ganga sediment at Varanasi, India using sequential extraction procedure and SEM-EDS[J]. Chemosphere, 2015, 134:466-474.
[14]MATONG J M, NYABA L, NOMNGONGO P N.Fractionation of trace elements in agricultural soils using ultrasound assisted sequential extraction prior to inductively coupled plasma mass spectrometric determination[J]. Chemosphere, 2016, 154:249-257.
[15]HAMDOUN H, LELEYTER L, VAN-VEEN E, et al.Comparison of three procedures(single, sequential and kinetic extractions)for mobility assessment of Cu, Pb and Zn in harbour sediments[J]. Comptes Rendus Geoscience, 2015, 347(2):94-102.
[16]杜瑾,郝建安,张晓青,等.微生物合成鼠李糖脂生物表面活性剂的研究进展[J].化学与生物工程, 2015,32(4):5-11.
[2]刘贵云,姜佩华.河道底泥资源化的意义及其途径研究[J].东华大学学报(自然科学版), 2002, 28(1):33-36.
[3]PENG J F, SONG Y H, YUAN P, et al. The remediation of heavy metals contaminated sediment[J].Journal of Hazardous Materials, 2009, 161(2/3):633-640.
[4]PESONEN J, YLINIEMI J, LLLIKAINEN M, et al.Stabilization/solidification of fly ash from fluidized bed combustion of recovered fuel and biofuel using alkali activation and cement addition[J]. Journal of Environmental Chemical Engineering, 2016, 4(2):1759-1768.
[5]JING Z Z, JIN F M, YAMASAKI N, et al. Potential utilization of riverbed sediments by hydrothermal solidification and its hardening mechanism[J]. Journal of Environmental Management, 2009, 90(5):1744-1750.
[6]蒲凡,詹树林,赖俊英. NaOH对固化海涂淤泥强度和变形特性的影响研究[J].新型建筑材料, 2011, 38(5):9-12.
[7]SUTHERLAND R A. Loss-on-ignition estimates of organic matter and relationships to organic carbon in fluvial bed sediments[J]. Hydrobiologia, 1998, 389(1/2/3):153-167.
[8]中华人民共和国交通运输部. JTG E51—2009公路工程无机结合料稳定材料试验规程[S].北京：人民交通出版社，2009.
[9]TESSIER A, CAMPBELL P G C, BISSON M.Sequential extraction procedure for the speciation of particulate trace metals[J]. Analytical Chemistry, 1979,51(7):844-851.
[10]PéREZ-CID B, LAVILLA I, BENDICHO C.Comparison between conventional and ultrasound accelerated Tessier sequential extraction schemes for metal fractionation in sewage sludge[J]. Fresenius Journal of Analytical Chemistry, 1999, 363(7):667-672.
[11]国家环境保护总局. GB 5085.3—2007危险废物鉴别标准-浸出毒性鉴别[S].北京:中国环境出版社,2007.
[12]WANG L, TSANG D C W, POON C S. Green remediation and recycling of contaminated sediment by waste-incorporatedstabilization/solidification[J].Chemosphere, 2015, 122:257-264.
[13]PANDEY M, PANDEY A K, MISHRA A, et al.Assessment of metal species in river Ganga sediment at Varanasi, India using sequential extraction procedure and SEM-EDS[J]. Chemosphere, 2015, 134:466-474.
[14]MATONG J M, NYABA L, NOMNGONGO P N.Fractionation of trace elements in agricultural soils using ultrasound assisted sequential extraction prior to inductively coupled plasma mass spectrometric determination[J]. Chemosphere, 2016, 154:249-257.
[15]HAMDOUN H, LELEYTER L, VAN-VEEN E, et al.Comparison of three procedures(single, sequential and kinetic extractions)for mobility assessment of Cu, Pb and Zn in harbour sediments[J]. Comptes Rendus Geoscience, 2015, 347(2):94-102.
[16]杜瑾,郝建安,张晓青,等.微生物合成鼠李糖脂生物表面活性剂的研究进展[J].化学与生物工程, 2015,32(4):5-11.
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