Study on the Optimization and Experimental of Fly Ash and Sludge in Ecological Slope Protection Substrate

Abstract:

At present, adding solid waste in plant substrate to replace part of planting soil has become a new direction in the field of ecological slope protection substrate research. In this paper, 16 groups of indoor orthogonal experiments were carried out with fly ash and sludge as the components of vegetation substrate and tall fescue as the planting object to explore the influence of ecological slope protection substrate on vegetation growth. Based on the range analysis method, the three functions of substrate planting performance, mechanical properties and substrate properties were used as references, and the entropy weight method (EWM) was used to assign weights to the proportion of each index in the total score, and the ratio was optimized. The results show that the optimal substrate ratio is 10% sludge content, 30% fly ash, 4% cement, 6% fiber, 50% planting soil (the ratio of loess and peat soil is 1:3). Fly ash has a great influence on the height of plants and vegetation coverage, and has a significant effect on the internal friction angle and fertility of the substrate. Sludge mainly affects the growth height of plants and the pH value and fertility of the substrate. The importance of factors affecting the growth of plants from large to small is: fly ash, the ratio of loess and peat soil, sludge, rice husk, cement.

• Periodical: Materials Science Forum (Volume 1121)
• Pages: 97-116
• DOI: https://doi.org/10.4028/p-Z1hrOg
• Online since: May 2024
• Authors: Hai Tao Wang*, Yu Zhang, Lin Lin Liu, Yue Xin, Kun Ren
• Keywords: Ecological Slope Protection, Orthogonal Test, Range Analysis, Solid Waste Utilization, Substrate Ratio

References

[1] J. Yu, Municipal Solid Waste Utilization and Disposal, China Resour. Compr. Util. 38 (2020) 123-125

[2] B.F Luo, The Treatment and Resource Utilization of Urban Solid Waste, Resour. Sav. Environ. Prot. 5 (2022) 80-83

[3] H.L. Xiao, Q. Ma, J.J. Ye, et al, Optimization on formulation of peat-fiber-cement-based dry-sprayed substrate for slope ecological protection by site experiment, Trans. Chin. Soc. Agric. Eng. 31 (2015) 221-227

[4] J. Xia, Experiment of Performance of Basis Material and Plant Furnishing for Ecology Protection of Slope, M.S. thesis, Hubei University of Technology, Hubei, 2019.

[5] T.L Xu, Experimental study on vegetation planting method of phosphorus slag concrete in high and steep rock slope, in: Chinese Hydraulic Engineering Society. The second volume of papers of the 2019 academic annual meeting of the China Water Conservancy Association. Dongping Lake Administration Liangshan Yellow River Bureau, China, 2019, p.7

[6] C.F. Cheng, W.L. Liu, H.Y. Zhao, et al, Preparation of Vegetation Substrate for Slope Ecological Restoration and Planting Experiment of Copper Tailings, Nonferrous Met. Eng. 13 (2023) 146-154. DOI: 10.3696/j.issn. 2095-1744.2023.03.018

[7] X.H. Dai, Present Situation and Development Trend of Sludge Treatment and Disposal in China, Sci. 72 (2020) 30-34.

[8] M.J. Li, Y.G. Wu, The Research of Phosphogypsum, Fly ash and Activated Sludge Application Technology in the Green Medium, Guizhou Chem. Ind. 35 (2010) 1-6.

[9] W.J. Yang, C.J. Yang, L. Pan, et al, Study on Cement Modification of Phosphgypsum-Fly Ash-Humus Soil Vegetation Material, Non-Met. Mines 43 (2020) 20-23.

[10] L. Wang, X.P. Guo, Z.G. Han, et al, Study on Formula of Soil Substrates for Improving Abandoned Lands in Lu'an Coal Mine, Soils, 52 (2020) 145-152

[11] Q.Y. Fan, C.Y. Zhang, Y.Q. Geng, et al, Effects of fly ash application on the properties of coal gangue matrix and plant growth, Sci. Soil Water Conserv. 20 (2022) 85-92

[12] J. Wan, L.X. Wang, H.L. Xiao, et al, Growth Characteristics of Cynodon Dactylon and Mechanical Properties of Slope with Different Sludge Contents, Environ. Technol. 44 (2023) 4284-4295

DOI: 10.1080/09593330.2022.2090861

[13] H.J. Zheng, L. Hua, Z.G. Gao, et al, Effects of the planting environment of lawn brick with fly-ash medium on the growth of turfgrass," Acta Ecol. Sin. 23 (2003) 2009-2016.

[14] H.J. Zheng, Study on the substrate and cultivation environment of fly ash lawn, M.S. thesis, Capital Normal University, Beijing, 2004.

[15] S.L. Hao, Y. Ding, X.F. Yu, et al, Effect of lime and fly ash on chemical forms of heavy metal in sudden polluted soils, Guangdong Agric. Sci. 39 (2012) 55-57

[16] T. Zhang, A.L. Shi, J. Ren, et al, Research Progress on Application of Fly Ash in Agriculture, Mod. Agric. Sci. Technol. 20 (2023) 127-130. DOI：

[17] F.L. Song, Study on ecological slope protection technology based on substrate-vegetation system, M.S. thesis, Anhui Agriculture University, Anhui, 2009.

[18] G.L. Li, S. Wu, C.H. Xu, et al, Effects of Urban Sludge on Soil Environment of Wheat Field, Anhui Agri. Sci. Bull. 26 (2020) 117-118

[19] Q. Peng, Experimental study on the performance of ecological slope protection substrate and plant configuration, M.S. thesis, Hubei University of Technology, Hubei, 2011.

[20] Y. Yang, J.Y. Yang, T.N. Zhao, et al, Ecological restoration of highway slope by covering with straw-mat and seeding with grass-legume mixture, Ecol. Eng. 90 (2016) 68-76

DOI: 10.1016/j.ecoleng.2016.01.052

[21] F. Chen, Y. Xu, C. Wang, et al, Effects of concrete content on seed germination and seedling establishment in vegetation concrete matrix in slope restoration, Ecol. Eng. 58 (2013) 99-104

DOI: 10.1016/j.ecoleng.2013.06.016

[22] J. Wan, L.X. Wang, H.L. Xiao, et al, Growth characteristics of Cynodon dactylon and mechanical properties of slope with different sludge contents, Environ. Technol. 44 (2022) 4284-4295

DOI: 10.1080/09593330.2022.2090861

[23] X. Huang, Study on the best mix ratio of planting ecological concrete in river regulation project, Water Resources & Hydropower of Northeast China, 38 (2020) 53-55

[24] L. Pan, Experimental analysis of base material loss of ecological slope protection in water conservancy project, Water Conservancy Sci. Technol. Econ. 28 (2020) 81-84. DOI: 10. 3969 /j. issn. 1006-7175. 2022. 11. 017

[25] J.C. Lin, Realization of entropy weight method to determine evaluation index weight in Excel, Chin. J. Hosp. Stat. 27 (2020) 362-364. DOI：10.3969 ／j.issn.1006-5253.2020.04.018

[26] Q.W. Zhang, Z.Y. Wang, Optimization of Alcohol Extraction Process of Xiao'er Baotaikang Granules by the Orthogonal Test Based on Entropy Weight Method, China Pharm. 31 (2022) 62-65. DOI:10.3969 / j.issn.1006 - 4931.2022.18.014