Impact of changing environmental factors and species competition on iron filings‐based green environmental media for nutrient removal in stormwater treatment

2018 ◽  
Vol 38 (4) ◽  
pp. 13087 ◽  
Author(s):  
Ni‐Bin Chang ◽  
Dan Wen ◽  
Martin P. Wanielista
Keyword(s):  
Environmental Factors ◽  
Nutrient Removal ◽  
Species Competition ◽  
Stormwater Treatment ◽  
Environmental Media

scholarly journals Non-Negligible Effects of UV Irradiation on Transformation and Environmental Risks of Microplastics in the Water Environment

2021 ◽  
Vol 12 (1) ◽  
pp. 1-12
Author(s):  
Fangyuan Cheng ◽  
Tingting Zhang ◽  
Yue Liu ◽  
Yanan Zhang ◽  
Jiao Qu
Keyword(s):  
Environmental Factors ◽  
Uv Irradiation ◽  
Water Environment ◽  
Oxidative Degradation ◽  
Environmental Risks ◽  
Important Process ◽  
Environmental Behaviors ◽  
Environmental Media ◽  
Different Types ◽  
Harmful Effects

Microplastics (MPs) are ubiquitous in environmental media, and their harmful effects on MPs on the ecosystem have attracted more and more attention. Once released into the environment, MPs can trigger oxidative degradation through ultraviolet (UV) to cause photoaging. Photoaging significantly affects the properties of MPs, which leads to changing their environmental behaviors and increasing environmental risks. In this review, the generation of MPs under UV irradiation and the influence of environmental factors on the photoaging of MPs were discussed. Photoaging of MPs is an important process affecting the migration, transformation and interaction of pollutants in water and soil. In order to fully predict the fate and environmental interaction of MPs, more researches are needed in the future to explore the photoaging behavior of different types of MPs under natural environmental conditions.

Evaluation of phosphorus retention in a South Florida treatment wetland

2001 ◽  
Vol 44 (11-12) ◽  
pp. 109-115 ◽  
Author(s):  
M.K. Nungesser ◽  
M.J. Chimney
Keyword(s):  
Removal Efficiency ◽  
Nutrient Removal ◽  
Aquatic Vegetation ◽  
South Florida ◽  
Superior Performance ◽  
Stormwater Treatment ◽  
Treatment Wetland ◽  
Operational Conditions ◽  
Macrophyte Community ◽  
Floating Macrophyte

The Everglades Construction Project of the South Florida Water Management District (District) will employ large constructed wetlands known as Stormwater Treatment Areas (STAs) to reduce phosphorus concentrations in runoff entering the Everglades. The District built and operated a prototype STA, the 1,545 ha Everglades Nutrient Removal Project (ENRP), to determine the efficacy of subtropical wetlands for improving regional water quality with a focus on reducing total phosphorus (TP). In five years of operation, the ENRP has consistently exceeded its performance goals of TP outflow concentrations <50 μg P/L and a 75% TP load reduction. Since August 1994, the ENRP has retained 70.3 metric tons of TP that otherwise would have entered the Everglades. When corrected for surface area and inflow TP load, TP removal efficiency was highest in the inflow buffer cell and decreased generally in a downstream fashion through the wetland. High TP removal efficiency in treatment cell 4 was attributed to superior performance of its submerged aquatic vegetation community relative to the emergent and floating macrophyte community in the other cells. Controlled experiments in the District's STA Optimization Research Program will help clarify what effect vegetation and operational conditions may have on nutrient removal in the STAs.

The Standing Crop of Fish in Lakes

1955 ◽  
Vol 12 (4) ◽  
pp. 543-570 ◽  
Author(s):  
Kenneth D. Carlander
Keyword(s):  
Environmental Factors ◽  
Standing Crop ◽  
The Other ◽  
Warm Water ◽  
Carbonate Content ◽  
Food Level ◽  
Habitat Segregation ◽  
Species Competition ◽  
Regression Methods ◽  
Number Of Species

To determine whether certain environmental factors may affect standing crop, an analysis was made, primarily by regression methods, of the published estimates of standing crops of fish in lakes and ponds. Standing crop estimates derived by draining and those by poisoning appear to be equally accurate, but marking and recovery estimates may not be directly comparable with the other two. Average standing crops in river backwaters and oxbows were almost 500 pounds per acre; in midwestern reservoirs, almost 400 pounds per acre; in other reservoirs and ponds, 200 to 300; in warm-water lakes, 125 to 150; and in trout lakes, less than 50 pounds per acre.No correlation could be shown between areas of lakes or ponds and their standing crops per acre. There was a tendency for standing crop per acre to decrease with increase in maximum depth of trout lakes, of warm-water lakes, and probably of reservoirs. Significant increase in standing crop per acre with increase in carbonate content of the water was found in trout lakes, warm-water lakes and midwestern reservoirs.Elton's pyramid of numbers was demonstrated in an analysis of standing crop per acre by species. Competition between species at the same food level may be mitigated by habitat segregation. Standing crop per acre increases as the number of species increases or as the niches are filled. However, standing crops of given species were usually highest when only one or two species were present. Regressions of the standing crops of one species upon those of other species may give clues as to the degree of competition or of protocooperation, but these clues must be critically evaluated since the regressions may be due to factors other than the presence of the other species.

Nutrient removal in the river basin of the Ruhr - a German case study

2001 ◽  
Vol 44 (1) ◽  
pp. 15-24 ◽  
Author(s):  
H. Bode ◽  
R. Klopp
Keyword(s):  
Nutrient Removal ◽  
Sewage Treatment ◽  
Agricultural Practices ◽  
Ammonia Nitrogen ◽  
Point Sources ◽  
Nutrient Load ◽  
Water Production ◽  
Stormwater Treatment ◽  
Drinking Water Production

In the catchment area of the Ruhr, restructuring and upgrading measures in the domain of wastewater and stormwater treatment have been under way since 1990 to successively implement the currently applicable legal requirements for nutrient removal. With 2.1 million inhabitants and a design capacity of 3.7 million population equivalents (PE), it is expected that approximately DM 2 billion still have to be invested from 2000 onward. With this it will be possible to further cut the nutrient load in the Ruhr River, that has been declining consistently since the 1970s: by about 25% for Ntotal and about 10% for Ptotal. The anticipated decrease in ammonia-nitrogen in winter is particularly important for drinking water production from the river water (bank filtration). Whether and to what an extent the expected decline in phosphorus concentrations will curb eutrophication in the Ruhr with its several impounded stretches remains to be seen. Further nutrient load reductions cannot be achieved by sewage treatment-related measures. Load balances underline the adverse impact of diffuse or non-point sources, in particular, for nitrogen. Some potential to further improve the situation is seen in minimizing the nutrient releases from agricultural practices.

Removal of dissolved nitrogen, phosphorus and carbon from stormwater by biofiltration mesocosms

2007 ◽  
Vol 55 (4) ◽  
pp. 183-191 ◽  
Author(s):  
C. Henderson ◽  
M. Greenway ◽  
I. Phillips
Keyword(s):  
Nutrient Removal ◽  
Sandy Loam ◽  
Tap Water ◽  
Growth Media ◽  
Published Data ◽  
Good Growth ◽  
Stormwater Treatment ◽  
Nitrogen And Phosphorus ◽  
Experimental Conditions ◽  
Nitrogen Phosphorus

Biofiltration systems are becoming a popular stormwater treatment device in water sensitive urban design for the removal of fine particulate and dissolved pollutants from stormwater. However, there is limited published data on the effectiveness of these systems for nutrient removal. We constructed biofiltration mesocosms to assess nutrient removal (nitrogen, phosphorus and carbon) under experimental conditions. Different types of media were compared (gravel, sand, and sandy-loam) in vegetated and non-vegetated mesocosms (six treatments in total). Five plant species were used. Vegetated sand and vegetated sandy-loam provided the best overall treatment. Vegetated mesocosms were very effective in removing nitrogen (63–77% removal) and phosphorus (85–94% removal) from synthetic stormwater, and removed substantially more nutrients than the non-vegetated treatments. All treatments removed a substantial portion of the carbon from the stormwater (28–66%). When flushed with tap water, nitrogen and phosphorus were retained by the vegetated mesocosms, but leached from the non-vegetated mesocosms. Plant growth was most vigorous in the sandy-loam media, indicating that this is a good growth media, even without the addition of organic matter.

Comparison of the Purifying Efficiency of High Rate Algal Pond with Stabilization Pond

1992 ◽  
Vol 25 (12) ◽  
pp. 197-206 ◽  
Author(s):  
B. Picot ◽  
A. Bahlaoui ◽  
S. Moersidik ◽  
B. Baleux ◽  
J. Bontoux
Keyword(s):  
Environmental Factors ◽  
Surface Area ◽  
Retention Time ◽  
Nutrient Removal ◽  
Algal Growth ◽  
Coastal Areas ◽  
Large Surface Area ◽  
High Rate ◽  
Small Communities ◽  
Shellfish Farming

Due to its high sanitary efficiency, treatment of wastewater by Stabilization Ponds (SP) is proposed for sensitive coastal areas (proximity to bathing areas, shellfish farming lagoons). This process, suitable for small communities with high summer populations, requires a large surface area. The objective of this study is to compare High Rate Algal Pond (HRAP) purifying efficiency with that of SP. We have experimented with a HRAP process, which by generating algal growth reduces the required surface area; our studies suggest this to be by a factor of 5. This process is particularly interesting for nutrient removal, especially nitrogen, and could be useful in coastal areas susceptible to eutrophication. Its sanitary performance is comparable to that of SP. Environmental factors and pond depth play a more important role in HRAP efficiency than retention time of water in the basins.

Influence of Hydraulic Conductivity and Organic Matter Content in Different Bioretention Media on Nutrient Removal

2015 ◽  
Vol 802 ◽  
pp. 448-453 ◽  
Author(s):  
Hui Weng Goh ◽  
Tze Liang Lau ◽  
Keng Yuen Foo ◽  
Chun Kiat Chang ◽  
Nor Azazi Zakaria
Keyword(s):  
Organic Matter ◽  
Hydraulic Conductivity ◽  
Nutrient Removal ◽  
Organic Matter Content ◽  
Matter Content ◽  
Stormwater Treatment ◽  
Media Comparison ◽  
The Media ◽  
Performance Results ◽  
Cockle Shell

Bioretention media composition plays an important role in maintaining hydraulic conductivity within appropriate range and treating stormwater runoff to reduce pollution to receiving water bodies. This study investigated 4 types of bioretention media, 2 of which different types of compost and another 2 using shredded newspaper and crushed cockle shell as additives to modify the bioretention media. The objective of the study was to provide insight on hydraulic performance and media characteristics that control bioretention stormwater treatment performance. Results showed that organic matter content has no effect on hydraulic conductivity and nutrient removal performance of the media. Comparison of hydraulic conductivity and nutrient removal showed that reduced hydraulic conductivity (from 250mm/hr to 159mm/hr) increased total suspended solids (TSS) removal of the media (up to 98.5%) but has no effect on total nitrogen (TN) and total phosphorus (TP). The preliminary pollutant test using natural runoff showed that bioretention media enhanced with 10% shredded newspaper performed the best in TN removal (up to 85.3%) and bioretention media enhanced with 10% crushed cockle shell removed the most TP (up to 95.6%).

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