1. An, J., Gong, S., & Chen, W. (2016). Temporal and spatial characteristics and health risk assessments of heavy metal pollution in soils of Shenfu irrigation area. Journal of Agro-Environment Science, 35(1), 37–44.
2. Cheng, G., Li, Q., Su, Z., Sheng, S., & Fu, J. (2018). Preparation, optimization, and application of sustainable ceramsite substrate from coal fly ash/waterworks sludge/oyster shell for phosphorus immobilization in constructed wetlands. Journal of Cleaner Production, 175, 572–581.
3. Cheng, Y., Wong, Y., Whitwell, C., Innes, L., & Kaksonen, H. (2019). A new method for ranking potential hazards and risks from wastes. Journal of Hazardous Materials, 365, 778–788.
4. CSC (China State Council). (2016). Comprehensive work plan for energy conservation and emission reduction in the 13th Five-year Plan. Retrieved from, http://www.ndrc.gov.cn/zcfb/zcfbqt/201701/t20170105_834500.html. Accessed 12 Aug 2019.
5. Dong, B., Liu, X., Dai, L., & Dai, X. (2013). Changes of heavy metal speciation during high-solid anaerobic digestion of sewage sludge. Bioresource Technology, 131, 152–158.