scholarly journals Distribution Coefficients of Nitrogen Pollutants Between Water-Sediment And Their Environmental Risks In Lingang Hybrid Constructed Wetland Fed By Industrial Tailwater, Tianjin, China

2021 ◽  
Author(s):  
Quanli Man ◽  
Hongrui Li ◽  
Xiaodong Ma ◽  
Peng Gao ◽  
Gengbo Ren ◽  
...  
Keyword(s):  
Pollution Index ◽  
Distribution Coefficients ◽  
Environmental Risks ◽  
Pollutant Removal ◽  
Control Measures ◽  
Polluted Water ◽  
Temporal Perspective ◽  
Fate Of Nitrogen ◽  
Risks Assessment ◽  
Nitrogen Pollutants

Abstract Exploring the fate of nitrogen pollutants in constructed wetlands (CWs) fed by industrial tailwater is significant to strengthen its pollution control and promoting the development of CWs in the field of micro-polluted water treatment. In this study, the distribution coefficients and the environmental risks of nitrogen pollutants between water-sediment of the hybrid CW in Tianjin were systematically investigated. From a spatial perspective, the nitrogen pollutants could be removed in this hybrid CW, and subsurface flow wetland played a key role in nitrogen pollutant removal. From a temporal perspective, the consistence of nitrogen pollutants was largely affected by the dissolved oxygen (DO) and temperature. The distribution coefficient of nitrogen pollutants between water-sediment was further clarified, suggesting that NH4+-N was more likely to be enriched in sediments due to microbial process. The overall level of pollution in hybrid CW was moderate according to the nutritional pollution index (NPI) analysis. The risks assessment indicated that timely dredging control measures should be considered to maintain the performance of hybrid CW.

scholarly journals Water Quality Estimation and Population’s Attitudes: A Multi-Disciplinary Perspective of Environmental Implications in Tara National Park (Serbia)

2020 ◽  
Vol 13 (1) ◽  
pp. 241
Author(s):  
Jovana Brankov ◽  
Ana Milanović Pešić ◽  
Dragana Milijašević Joksimović ◽  
Milan M. Radovanović ◽  
Marko D. Petrović
Keyword(s):  
Water Quality ◽  
National Parks ◽  
National Park ◽  
Local Community ◽  
Pollution Index ◽  
Field Research ◽  
Polluted Water ◽  
Pollution Level ◽  
Environmental Implications ◽  
Water Pollution Index

The paper analyzes the water quality of hydrological resources in the wider area of Tara National Park (NP Tara) in Serbia and the opinions of the local community and the national park visitors about the grade of the possible damage. The pollution level of the Drina River at the Bajina Bašta hydrological station was analyzed using the Water Pollution Index. The results showed that water quality corresponded to classes II (clean water) or III (moderately polluted water) and revealed the presence of organic pollution. In addition, using a survey combined with field research, the perceptions of local inhabitants and national park visitors related to environmental pollution were analyzed. The community believed that tourism does not cause significant damage to the environment. However, the older and more educated groups of residents and visitors had a more critical perception of the environmental impact of tourism. The results also indicated that the perceptions of visitors were mostly in agreement with measured water quality in the Drina River. The findings of this study have important implications for the management of protected areas and future policies related to national parks.

scholarly journals Improving the Treatment Performance of Low Impact Development Practices—Comparison of Sand and Bioretention Soil Mixtures Using Column Experiments

Water ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1210
Author(s):  
Abtin Shahrokh Hamedani ◽  
Arianne Bazilio ◽  
Hanieh Soleimanifar ◽  
Heather Shipley ◽  
Marcio Giacomoni
Keyword(s):  
Phosphorus Removal ◽  
Low Impact Development ◽  
Pollutant Removal ◽  
Control Measures ◽  
Column Experiments ◽  
Removal Rates ◽  
Treatment Performance ◽  
Soil Mixtures ◽  
Limestone Sand ◽  
The Impact

Low impact development (LID) practices, such as bioretention and sand filter basins, are stormwater control measures designed to mitigate the adverse impacts of urbanization on stormwater. LID treatment performance is highly dependent on the media characteristics. The literature suggests that bioretention media often leach nutrients in the stormwater effluent. The objective of this study was to analyze the treatment performance of different sand and bioretention soil mixtures. Specifically, this investigation aimed to answer whether the use of limestone and recycled glass could improve the treatment performance of bioretention systems. Column experiments were designed to assess (1) the removal efficiencies of different sand and bioretention soil mixtures and (2) the impact of plant uptake on removal rates. Enhanced pollutant removal was observed for the custom blends with addition of limestone sand, indicating mean dissolved and total phosphorus removal of 44.5% and 32.6% respectively, while the conventional bioretention soil mixtures leached phosphorus. Moreover, improved treatment of dissolved and total copper was achieved with mean removal rates of 70.7% and 93.4%, respectively. The results suggest that the nutrient effluent concentration decreased with the addition of plants, with mean phosphorus removal of 72.4%, and mean nitrogen removal of 22% for the limestone blend.

scholarly journals ENVIRONMENTAL RISKS ASSESSMENT FOR SOILS AND PLANTS IRRIGATED FROM El-MARIOUTEYA AND EL-RAHAWY DRAIN

2019 ◽  
Vol 46 (2) ◽  
pp. 1-33
Author(s):  
A. Taha Aya ◽  
A. Kishar Esam ◽  
A. A. Sherif Abd El-Hamid
Keyword(s):  
Environmental Risks ◽  
Risks Assessment

Study of Health & Environmental Risks Associated with Polluted Water Irrigation

2011 ◽  
pp. 26-31
Author(s):  
M. Aqeel Ashraf ◽  
K. Mahmood ◽  
M. Jamil Maah ◽  
I. Yusoff ◽  
A. Wajid
Keyword(s):  
Environmental Risks ◽  
Polluted Water

To Remove or Not to Remove? Dealing with pollution risks from ship wrecks

2017 ◽  
Vol 2017 (1) ◽  
pp. 457-477
Author(s):  
Mark Whittington ◽  
Ann Zhang ◽  
David Campion
Keyword(s):  
Decision Making ◽  
Environmental Concern ◽  
Environmental Risks ◽  
Pollutant Removal ◽  
Decision Making Process ◽  
Maritime Industry ◽  
Extensive Experience ◽  
International Convention ◽  
Recent Developments ◽  
Equitable Treatment

Abstract (ID: 2017-155) ABSTRACT The navigational and environmental risks posed by ship wrecks have presented a challenge to governments and the maritime industry for decades. In more recent years a consensus has developed worldwide based on assessing these risks and undertaking measures proportional to the severity of those risks. This approach has been formalised in the Nairobi International Convention on the Removal of Wrecks 2007. With recent developments in salvage technology and equipment, the options for pollutant removal from wrecks, and the removal of entire wrecks, are becoming viable for scenarios which were previously deemed infeasible. Together with a general heightened environmental concern worldwide about impacts to the marine environment, decision-making on wreck removal and associated pollutants is under the spotlight. Based on ITOPF’s extensive experience providing advice on pollution mitigation and environmental risks posed by wrecks, this paper examines recent issues in the treatment of wrecks. The authors highlight some key concerns regarding the equitable treatment of wrecks and argue that a more rigorous, technically-based decision making process be adopted and promoted to ensure clarity and consistency for all parties.

The Research with Advanced Oxidation Technology to Degrade Organic Matter in Micro-Polluted Water

2011 ◽  
Vol 219-220 ◽  
pp. 804-808
Author(s):  
Xia Zhao ◽  
He Ming Luo ◽  
Hui Xia Feng ◽  
Jian Qiang Zhang
Keyword(s):  
Organic Matter ◽  
Potassium Permanganate ◽  
Removal Rate ◽  
Water Environment ◽  
Pollution Index ◽  
Advanced Oxidation ◽  
Polluted Water ◽  
Advanced Oxidation Technology ◽  
Oxidation Technology

Potassium permanganate process is an advanced oxidation technique that can provide a resolution removing organic matter in contaminated water. In this paper, the combination of composite potassium permanganate and a certain coagulant used in this process, which it was particularly suited to rapidly oxidize and degrade pollutants. It was an effective enhanced coagulation, advanced oxidation technique that could be conducted in a normal micro-polluted water environment. A series of experiment results demonstrated that the best adding quantity of composite potassium permanganate was 1.5-3.0mg/l, the best adding quantity of PFS as the coagulant was 25mg/l. Under the above conditions, potassium permanganate oxidation obviously reduced to each pollution index and greatly improved the water quality of purification of micro-polluted water. Furthermore, the organic removal rate with composite potassium permanganate was more than the unitary potassium permanganate process and the current traditional process.

Water Quality Monitoring, Early Warning and Identification of Risk Sources of South Lake Central Ecological Park in Tangshan City

2013 ◽  
Vol 746 ◽  
pp. 147-151 ◽  
Author(s):  
Jun Li ◽  
Jun Wang Tong ◽  
Shou Fang Jiang ◽  
Liu Nan ◽  
Shao Jia Wang ◽  
...  
Keyword(s):  
Water Quality ◽  
Nitrate Nitrogen ◽  
Oxygen Demand ◽  
Pollution Index ◽  
Ammonia Nitrogen ◽  
National Standards ◽  
Polluted Water ◽  
Clean Water ◽  
Sample Points

Objectives To assess the current eutrophication and heavy metal pollution condition of South Lake by monitoring the water quality of South Lake Central Ecological Park in Tangshan city and to provide basic information and science basis for the continuity environmental monitoring and further treatment. Methods The water samples in South Lake were collected during 10th-12st May, 2011. Samples of surface water in Xixingchi, Yanglongshui, and Qingtianjing were determined temperature, pH, turbidity, dissolved oxygen (DO), biochemical oxygen demand (COD), biological oxygen demand (BOD520), total phosphorus (TP), ammonia nitrogen, nitrite nitrogen, nitrate nitrogen, Hg, As, Cr, Cu, Zn, Ni, Pb, Cd and so on. Single water quality index and the integrated pollution index were calculated to assess water quality of sampling point. Results The sense character of all sample points did not accord with national standards.The BOD520 of Xixingchi, West Yanglongshui, North Yanglongshui and the four sampling points of Qingtianjing were more than national standards. The TP, ammonia nitrogen and nitrate nitrogen of Qingtianjings sample points exceeded national standards. Indicatorss of other sample were accord with national standards. Xixingchi, whichs comprehensive pollution index was 0.27, belonged to clean water. Yanglongshui, which`s comprehensive pollution index was 0.22, belonged to clean water too. Qingtianjing, whichs comprehensive pollution index was 1.99, belonged to polluted waters. Conclusions Xixingchi and Yanglongshui belongs to clean water. Qingtianjing belongs polluted water. The TP, ammonia nitrogen and nitrate nitrogen of Qingtianjings four sample points exceeded national standards. The severity of the pollution is: Qingtianjing>Yanglongshui>Xixingchi.

Experimental investigation on water treatment by the combined nano MgO–nanofiltration technique

2011 ◽  
Vol 63 (11) ◽  
pp. 2542-2546 ◽  
Author(s):  
Keqiang Zhang ◽  
Yi An ◽  
Feng Wang ◽  
Lingling Lin ◽  
Haigang Guo
Keyword(s):  
Heavy Metals ◽  
Experimental Investigation ◽  
Water Treatment ◽  
Suspended Solids ◽  
Pollutant Removal ◽  
Polluted Water ◽  
Operating Pressure ◽  
Nitrogen Species ◽  
Combined System ◽  
Mg Content

A combined system using nano MgO and nanofiltration (NF) membrane was established to purify polluted water in this experiment. The turbidity, permanganate index, UVA254, colony counts and the concentrations of NO3−, NO2−, NH4+, Fe, Mn and Mg of the effluents from each unit of this combined system were measured to investigate the pollutant removal of this system. Based on the results obtained, the combined nano MgO–NF system could efficiently remove many kinds of pollutants in this experiment, including organic matter, nitrogen species, heavy metals, suspended solids and bacteria. And the effluents could meet the standard of drinking water. Furthermore, increasing the nano MgO dosage could not elevate the removal ratio of the pollutants, but only increase the Mg content of the effluent. Thus, 0.05 g L−1 of nano MgO may be a suitable dosage for 2,000 L of polluted water treatment. Also, the operating pressure of NF membrane had no significant effect on pollutant removal when the operating pressure of NF membrane was increased from 0.3 to 0.9 MPa.

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