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Bawiec A, Pawęska K, Pulikowski K. LED light use for the improvement of wastewater treatment in the hydroponic system. ENVIRONMENTAL TECHNOLOGY 2020; 41:2024-2036. [PMID: 30484745 DOI: 10.1080/09593330.2018.1554007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2018] [Accepted: 11/23/2018] [Indexed: 06/09/2023]
Abstract
Effective removal of nitrogen and phosphorus from sewage before its discharge to the receiving water body is now a key task for scientists and technologists around the world. The widespread problem of eutrophication in the watercourses as well as in the seas and oceans obliges to take actions leading to more effective protection of water resources and implementation of sustainable development principles. One of the methods of increased wastewater treatment from nutrients is the use of a third stage of treatment with the use of macrophytes for the uptake of nitrogen and phosphorus. These systems, called hydroponic, under moderate climate conditions show little effectiveness due to the lack of sufficient light intensifying the growth of aquatic plants. The aim of this study was to evaluate the reduction of biogenic compounds concentrations in wastewater where additional lighting of plants was provided by the use of LED (Light Emitting Diodes), in two different conditions of experiment: with aeration and with carbon dioxide supplementation. Analyses show that the effectiveness of purification was higher in the wastewater supplemented with CO2 and artificial lighting had no significant influence on the reduction of nitrogen forms concentrations. In wastewater with aeration, higher effectiveness of nitrogen removal was observed in the tank with artificial lighting. In both cases, aeration or CO2 supplementation as well as artificial lighting or its lack, had no influence on total phosphorus and phosphates removal.
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Affiliation(s)
- Aleksandra Bawiec
- Institute of Environmental Engineering, Wrocław University of Environmental and Life Sciences, Wrocław, Poland
| | - Katarzyna Pawęska
- Institute of Environmental Engineering, Wrocław University of Environmental and Life Sciences, Wrocław, Poland
| | - Krzysztof Pulikowski
- Institute of Environmental Engineering, Wrocław University of Environmental and Life Sciences, Wrocław, Poland
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Shi Z, Qin S, Zhang C, Chiu YH, Zhang L. The Impacts of Water Pollution Emissions on Public Health in 30 Provinces of China. Healthcare (Basel) 2020; 8:E119. [PMID: 32365866 PMCID: PMC7349760 DOI: 10.3390/healthcare8020119] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2020] [Revised: 04/23/2020] [Accepted: 04/24/2020] [Indexed: 11/29/2022] Open
Abstract
China's economy in recent decades has developed at a very rapid speed, as evidenced by its GDP jumping to second place in the world. Although utilization of domestic water resources has helped spur economic development, sewage discharge as an undesirable output has unfortunately caused many negative effects on human health, causing concern from all walks of life. Therefore, governments in China at all levels are committed to urban sewage treatment policies in order to reduce the negative impact of water pollution on society. While most existing studies have targeted the macro-level modes of economic development and environmental pollution, their selection of research objects is too narrow by failing to adequately consider China's water pollution and the consequential national health crisis. This study takes cities in 30 provinces of China as the research objects and applies various influencing factors of urban wastewater treatment and health (as two stages) to the modified two-stage dynamic Slacks-Based Measures (SBM) Data Envelopment Analysis (DEA) model. The results reveal that the overall efficiency of each province is increasing and that the efficiency of the wastewater treatment stage is greater, thus contributing to overall efficiency. Conversely, the health stage's efficiency is far lower than the wastewater treatment stage's efficiency, which has a notably adverse effect on overall efficiency. In addition, most input-output variables need much improvement. Based on the findings herein, we offer specific suggestions to each province for improving sewage treatment capacity, the level of medical care, and the quality of national health.
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Affiliation(s)
- Zhen Shi
- Department of International Trade and Economics, Business School, Hohai University, Changzhou 213022, China;
| | - Shijiong Qin
- Department of Accounting, Business School, Hohai University, Changzhou 213022, China;
| | - Chenjun Zhang
- Department of Accounting, Business School, Hohai University, Changzhou 213022, China;
| | - Yung-ho Chiu
- Department of Economics, Soochow University, 56, Kueiyang St., Sec. 1, Taipei 10048, Taiwan;
| | - Lina Zhang
- Department of Business Administration, Business School, Hohai University, Changzhou 213022, China;
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Trinh VT, Nguyen TMP, Van HT, Hoang LP, Nguyen TV, Ha LT, Vu XH, Pham TT, Nguyen TN, Quang NV, Nguyen XC. Phosphate Adsorption by Silver Nanoparticles-Loaded Activated Carbon derived from Tea Residue. Sci Rep 2020; 10:3634. [PMID: 32107469 PMCID: PMC7046672 DOI: 10.1038/s41598-020-60542-0] [Citation(s) in RCA: 49] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2019] [Accepted: 02/11/2020] [Indexed: 11/24/2022] Open
Abstract
This study presents the removal of phosphate from aqueous solution using a new silver nanoparticles-loaded tea activated carbon (AgNPs-TAC) material. In order to reduce costs, the tea activated carbon was produced from tea residue. Batch adsorption experiments were conducted to evaluate the effects of impregnation ratio of AgNPs and TAC, pH solution, contact time, initial phosphate concentration and dose of AgNPs-AC on removing phosphate from aqueous solution. Results show that the best conditions for phosphate adsorption occurred at the impregnation ratio AgNPs/TAC of 3% w/w, pH 3, and contact time lasting 150 min. The maximum adsorption capacity of phosphate on AgNPs-TAC determined by the Langmuir model was 13.62 mg/g at an initial phosphate concentration of 30 mg/L. The adsorption isotherm of phosphate on AgNPs-TAC fits well with both the Langmuir and Sips models. The adsorption kinetics data were also described well by the pseudo-first-order and pseudo-second-order models with high correlation coefficients of 0.978 and 0.966, respectively. The adsorption process was controlled by chemisorption through complexes and ligand exchange mechanisms. This study suggests that AgNPs-TAC is a promising, low cost adsorbent for phosphate removal from aqueous solution.
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Affiliation(s)
- Van Tuyen Trinh
- Institute of Environmental Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet road, Ha Noi city, Vietnam
| | - Thi Minh Phuong Nguyen
- Faculty of Environment and Chemical Engineering, Duy Tan University (DTU), 254 Nguyen Van Linh road, Da Nang, Vietnam
| | - Huu Tap Van
- Faculty of Natural Resources and Environment, TNU-University of Sciences (TNUS), Tan Thinh Ward, Thai Nguyen City, Vietnam
| | - Le Phuong Hoang
- Faculty of Civil and Environmental Engineering, Thai Nguyen University of Technology (TNUT), Tich Luong Ward, Thai Nguyen City, Vietnam
| | - Tien Vinh Nguyen
- Faculty of Engineering and IT, University of Technology Sydney (UTS), Box 123, Broadway, Sydney, PO, Australia
| | - L T Ha
- Faculty of Physics and Technology, TNU-University of Sciences (TNUS), Tan Thinh Ward, Thai Nguyen City, Vietnam
| | - Xuan Hoa Vu
- Faculty of Physics and Technology, TNU-University of Sciences (TNUS), Tan Thinh Ward, Thai Nguyen City, Vietnam
| | - T T Pham
- Institute of Research and Development, Duy Tan University, Da Nang, 550000, Vietnam
| | - Thi Nu Nguyen
- Cao Bang Teacher's Training College, De Tham road, Cao Bang town, Cao Bang Province, Vietnam
| | - N V Quang
- Faculty of Chemistry, Ha Noi Pedagogical University 2, Vinh Phuc, Vietnam
| | - X C Nguyen
- Laboratory of Advanced Materials Chemistry, Advanced Institute of Materials Science, Ton Duc Thang University, Ho Chi Minh City, Vietnam.
- Faculty of Applied Sciences, Ton Duc Thang University, Ho Chi Minh City, Vietnam.
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The Development of a Novel Decision Support System for the Location of Green Infrastructure for Stormwater Management. SUSTAINABILITY 2018. [DOI: 10.3390/su10124388] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
In order to maximise the benefits of green infrastructure in a city’s structure for urban adaptation to climate change, there is a need to support decision-makers in the urban design domain with adequate information that would help them to locate such green infrastructure in the most suitable places. Therefore, the aim of this study was to develop a novel decision support system (DSS) for the location of green infrastructure. The goal of the designed solution is to inform users about the location of urban hydrological sinks, which gather stormwater in urban watersheds, and the amount of water which could accumulate in each location depending on the defined precipitation and the soil’s moisture conditions. The designed DSS is based on a multicomponent methodology including both atmospheric and soil conditions. The DSS was tested using a sample that presents the results of stormwater accumulation calculations. The obtained results show which green areas are the most suitable locations for green infrastructure solutions and which facility is optimal because of its retention abilities and amount of accumulated stormwater. The application of the designed DSS allows us to maximise the benefits of the implementation of green infrastructure within the existing urban land use. The fully editable component of hydrological conditions allows for testing projections of the potential amount of accumulated water in different precipitation scenarios. The study provides a DSS for use by local authorities which enables them to concentrate actions in order to better adapt cities to climate change and environmental extremes.
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