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Xiao J, Lin G, Cao Z, Chu S, Cui L, Yang Y, Wu X. A shallow constructed wetland combining porous filter material and Rotala rotundifolia for advanced treatment of municipal sewage at low HRT. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:27593-27602. [PMID: 36383319 DOI: 10.1007/s11356-022-24111-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2022] [Accepted: 11/04/2022] [Indexed: 06/16/2023]
Abstract
Water scarcity is a worldwide problem. Recycled municipal wastewater is considered a useful alternative to the conventional types of water resources. In this study, a shallow constructed wetland (SCW) with porous filter material and Rotala rotundifolia was used for advanced municipal sewage treatment. The wetland without plant was set as the control (SCW-C). The pollutant removal performance of the system at different hydraulic retention times (HRTs) was investigated. The diversity of the microbial community was analyzed, and the fate of nutrients, mainly N and P, in the system was discussed. Results showed that SCW was efficient in pollutant removal. Effluent concentrations of chemical oxygen demand (COD), total phosphorus (TP), and ammonium nitrogen (NH4+-N) were 15.0-23.6, 0.19-0.28, and 0.83-1.16 mg/L, separately, with average removal efficiencies of 61.2%, 46.3%, and 88.1% at HRT 18 h, which met the requirements of type [Formula: see text] water set by the environmental quality standards for surface water in China. The richness and evenness of the bacterial community were significantly higher in the plant-rooted SCW. They increased along with the system. The dominant genera in the system were phosphate-solubilizing bacteria, nitrifying bacteria, and denitrifying bacteria. The P in the influent mainly flowed to the substrate and plant. At the same time, most N was removed by nitrification and denitrification. These findings suggested that the SCW could remove pollutants from the municipal sewage effluent and meet the standard requirement at low HRT.
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Affiliation(s)
- Jibo Xiao
- College of Life and Environmental Science, Wenzhou University, Wenzhou, 325035, China
- National and Local Joint Engineering Research Center of Ecological Treatment Technology for Urban Water Pollution, Wenzhou University, Wenzhou, 325035, China
| | - Guo Lin
- College of Life and Environmental Science, Wenzhou University, Wenzhou, 325035, China
| | - Zhuangzhuang Cao
- College of Life and Environmental Science, Wenzhou University, Wenzhou, 325035, China
| | - Shuyi Chu
- College of Life and Environmental Science, Wenzhou University, Wenzhou, 325035, China.
- National and Local Joint Engineering Research Center of Ecological Treatment Technology for Urban Water Pollution, Wenzhou University, Wenzhou, 325035, China.
- Wenzhou Vocational College of Science and Technology, Wenzhou, 325000, China.
| | - Lingzhou Cui
- College of Life and Environmental Science, Wenzhou University, Wenzhou, 325035, China
- National and Local Joint Engineering Research Center of Ecological Treatment Technology for Urban Water Pollution, Wenzhou University, Wenzhou, 325035, China
| | - Yunlong Yang
- College of Life and Environmental Science, Wenzhou University, Wenzhou, 325035, China
- National and Local Joint Engineering Research Center of Ecological Treatment Technology for Urban Water Pollution, Wenzhou University, Wenzhou, 325035, China
| | - Xiangting Wu
- College of Life and Environmental Science, Wenzhou University, Wenzhou, 325035, China
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Zhang Y, Qin H, An G, Huang T. Vulnerability Assessment of Farmland Groundwater Pollution around Traditional Industrial Parks Based on the Improved DRASTIC Model—A Case Study in Shifang City, Sichuan Province, China. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2022; 19:ijerph19137600. [PMID: 35805257 PMCID: PMC9265768 DOI: 10.3390/ijerph19137600] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/07/2022] [Revised: 06/11/2022] [Accepted: 06/17/2022] [Indexed: 02/05/2023]
Abstract
In this study, an improved DRASTIC model, including the DRASTIC-LTPD model and the AHP-DRASTIC-LTPD model, with the addition of four extra evaluation factors, including land use type (L), aquifer thickness (T’), aquifer potential (P) and pollution source distance (D’), was constructed and compared to assess the groundwater vulnerability around farmland area in Shuangsheng Industrial Park, Sichuan Province, China. From the vulnerability grading charts of the traditional DRASTIC model, the improved DRASTIC-LTPD model and the AHP-DRASTIC-LTPD model, it showed that the vulnerability presented a lower level in the western and eastern farmland areas, whereas a higher level was in the central industrial park area. This result was consistent with the actual situation where groundwater recharge by rivers, regional land use, and human activities were more active in the middle in these areas. Nevertheless, the area at the same level of vulnerability varied greatly from model to model. The vulnerability index V-level region ratio calculated by the AHP-DRASTIC-LTPD model was 0, indicating that the distribution of vulnerability was smoother without the appearance of extremely good or poor conditions. From the present study, it was revealed that the AHP-DRASTIC-LTPD model could effectively reflect the impact of human activities and dilution on groundwater vulnerability. The adopted AHP method was also of high accuracy to empower the evaluation index leading to a more reliable evaluation results of regional groundwater vulnerability in comparison with the other two models. Therefore, this research could be employed as a reference for the evaluation of groundwater pollution around other similar unplanned industrial parks.
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Affiliation(s)
- Yibo Zhang
- School of Emergency Management, Xihua University, Chengdu 610039, China;
- Correspondence: ; Tel.: +86-135-4000-0463
| | - Hao Qin
- School of Emergency Management, Xihua University, Chengdu 610039, China;
| | - Guanping An
- Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 611756, China; (G.A.); (T.H.)
| | - Tao Huang
- Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 611756, China; (G.A.); (T.H.)
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Wang J, Wu S, Yang Q, Gu Y, Wang P, Li Z, Li L. Performance and mechanism of the in situ restoration effect on VHCs in the polluted river water based on the orthogonal experiment: photosynthetic fluorescence characteristics and microbial community analysis. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:43004-43018. [PMID: 35094283 DOI: 10.1007/s11356-022-18845-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/17/2021] [Accepted: 01/20/2022] [Indexed: 06/14/2023]
Abstract
Volatile halogenated hydrocarbons (VHCs) attracted many attentions due to its toxicity and persistence in the environment. In this research, a novel in situ ecological restoration reactor was applied to the degradation of VHCs in polluted river water. The optimized working condition adaptation of the in situ restoration technique was evaluated through orthogonal tests. The experiments showed that when the water depth was 0.4 m, the HRT was 5 days, and the current velocity was 1 m/s, the optimal removal efficiency of VHCs in the reactor was achieved. And the removal rates of CHCl3, CCl4, C2HCl3, and C2Cl4 reached 70.27%, 70.59%, 67.74%, and 81.82%, respectively. The results showed that both HRT and water depth were significantly related to the removal efficiency of reactor. The physiological state of the plants was analyzed by fitting rapid light curve (RLC) model, which showed that the accumulation of VHCs inhibited the photosynthetic performance of plants. Moreover, the microbial community structures of fillers were tested by high-throughput sequencing, and the findings supported that the microbial community made a great response to adapt to the changes in environment of the reactor. The relative abundance of Rhodocyclaceae increased slightly, which hinted that it had good adaptability to VHCs in polluted river water. The research results confirmed that in situ ecological restoration reactor was a potential approach for removal VHCs in polluted river water.
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Affiliation(s)
- Jia Wang
- School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing, 100083, China
- Beijing Institute of Water Science and Technology, Beijing, 100048, China
| | - Shuangrong Wu
- College of Civil and Architectural Engineering, Tangshan University, Tangshan, 063000, China
| | - Qi Yang
- School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing, 100083, China.
| | - Yonggang Gu
- Beijing Institute of Water Science and Technology, Beijing, 100048, China.
| | - Peijing Wang
- Beijing Institute of Water Science and Technology, Beijing, 100048, China
| | - Zhaoxin Li
- Beijing Institute of Water Science and Technology, Beijing, 100048, China
| | - Lei Li
- Beijing Institute of Water Science and Technology, Beijing, 100048, China
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