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Xu P, Tong J, Shi R. The mechanical and frost resistance properties of pressed concrete blocks mixed with the polymeric aluminum chloride waste residue. Sci Rep 2024; 14:12128. [PMID: 38802555 PMCID: PMC11130320 DOI: 10.1038/s41598-024-61347-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2023] [Accepted: 05/05/2024] [Indexed: 05/29/2024] Open
Abstract
This study aims to research on the mechanical and frost resistance properties of pressed concrete blocks mixed with the polymeric aluminum chloride (PAC) waste residue. Experimental studies on the activity index of volcanic ash, mechanical property, frost resistance and microstructure of pressed concrete blocks mixed with PAC waste residue were carried out. The results show that the activity index of volcanic ash of PAC waste residue reaches 74.96% at a particle size of 0.075 mm or less and a curing age of 28 days. Based on results of mechanical property tests, the optimum dosage of PAC waste residue is 15%, at which time the compressive and bending strength only decreases by 14.57% and 15.84%. Based on results of frost resistance tests, the optimum dosage of PAC waste residue for pressed concrete blocks is 10%. After 50 freeze-thaw cycles, when the dosage of PAC waste residue is 10%, the strength loss rate is only 3.04%. XRD and SEM tests show that PAC waste residue participates in chemical reactions. With a small amount of PAC waste residue, the structure of the specimen remains dense and therefore the strength decreases less.
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Affiliation(s)
- Ping Xu
- School of Civil Engineering, Henan Polytechnic University, Jiaozuo, 454003, Henan, China
- International Joint Research Laboratory of Henan Province for Underground Space Development and Disaster Prevention, Henan Polytechnic University, Jiaozuo, 454003, Henan, China
| | - Jin Tong
- School of Civil Engineering, Henan Polytechnic University, Jiaozuo, 454003, Henan, China.
| | - Rui Shi
- School of Civil Engineering, Henan Polytechnic University, Jiaozuo, 454003, Henan, China
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Li Q, Gao J, Zhang J, Huang Z, Wang S, Song B, Wang Q, Zhou W. Treatment of high-phosphorus load wastewater by column packed with non-burning compound filler/gravel/ceramsite: evaluation of performance and microorganism community. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:67730-67741. [PMID: 37118390 DOI: 10.1007/s11356-023-26487-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2022] [Accepted: 03/13/2023] [Indexed: 05/25/2023]
Abstract
Cost-effective and environmental-friendly substrates are essential for the constructed wetlands (CWs). In this study, the column test was used to explore the differences in pollutant purification performance, microbial community structure and abundance between non-burning compound filler and conventional CWs substrates (i.e. gravel and ceramsite) at low temperature (0-15℃). It was found that the maximum phosphorus removal efficiency of compound filler (99%) was better than gravel (18%) and ceramsite (21%). Besides, the proportion of aerobic heterotrophic bacteria capable of ammonium oxidation, nitrification and denitrification (i.e. Pseudomonas, Acinetobacter, and Acetoanaerobium) was enhanced by compound filler, which has an excellent potential for nitrogen removal in the subsequent purification process. These results demonstrated that the self-made non-burning compound filler was a potential substrate for CWs, which was of great significance for the resource utilization of solid wastes such as polyaluminum chloride residue.
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Affiliation(s)
- Qiang Li
- School of Ecology and Environment, Zhengzhou University, Zhengzhou, 450001, China
- College of Chemistry, Zhengzhou University, Zhengzhou, 450001, China
| | - Jingqing Gao
- School of Ecology and Environment, Zhengzhou University, Zhengzhou, 450001, China.
- Key Laboratory of Water Management and Water Security for Yellow River, Basin, Ministry of Water Resources (Under Construction), Zhengzhou, 450001, China.
| | - Jingshen Zhang
- College of Chemistry, Zhengzhou University, Zhengzhou, 450001, China
| | - Zhenzhen Huang
- School of Ecology and Environment, Zhengzhou University, Zhengzhou, 450001, China
- Faculty of Environmental and Municipal Engineering, Henan Province Key Laboratory of Water Pollution Control and Rehabilitation Technology, Henan University of Urban Construction, Pingdingshan, 467036, China
| | - Shilong Wang
- School of Ecology and Environment, Zhengzhou University, Zhengzhou, 450001, China
| | - Bozhen Song
- School of Ecology and Environment, Zhengzhou University, Zhengzhou, 450001, China
| | - Qiaojian Wang
- School of Ecology and Environment, Zhengzhou University, Zhengzhou, 450001, China
| | - Wanglin Zhou
- CSCEC Xinjiang Construction&Engineering (Group) Co.,Ltd, Xian, 710000, China
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Purification of Micro-Polluted Lake Water by Biofortification of Vertical Subsurface Flow Constructed Wetlands in Low-Temperature Season. WATER 2022. [DOI: 10.3390/w14060896] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
In this study, a novel lab-scale biofortification-combination system (BCS) of Oenanthe javanica and Bacillus series was developed to improve the treatment ability of vertical subsurface flow constructed wetlands (VSFCW) at low temperatures (0–10 °C). The results showed that BCS-VSFCW overcame the adverse effects of low temperature and achieved the deep removal of nutrients. In addition, the removal rates of chemical oxygen demand (COD), ammonia nitrogen (NH4+-N), total nitrogen (TN), and total phosphorus (TP) by BCS-VSFCW were 38.65%, 28.20%, 18.82%, and 14.57% higher than those of blank control, respectively. During the experiment, Oenanthe javanica and low temperature tolerant Bacillus complemented each other in terms of microbial activity and plant uptake. Therefore, VSFCW combined with Oenanthe javanica and low temperature tolerant Bacillus has a promising future in low temperature (<10 °C) areas of northern China.
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