Influence of sedimentation on nitrogen and phosphorus in …
Abstract. Most studies on nitrogen (N), phosphorus (P), and sedimentation in the Three Gorges Reservoir (TGR) have been mainly focused on the sedimentation distribution after impoundment of the ...
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Nitrogen and Vegetation Dynamics in European Salt Marshes
An overview is presented of various fluxes of nitrogen to and from salt marsh ecosystems. Our primary view is on European salt marshes. A nitrogen budget constructed for salt marsh ecosystems in the Wadden Sea area shows that N-influx rates via floodwater (50–200 kg N ha −1 y −1) and via atmospheric deposition (30 kg N ha −1 y −1 ...
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Primer for Municipal Wastewater Treatment Systems
Denitrification is the reduction of nitrite to nitrogen gas. Denitrification is carried out in wastewater treatment tanks by bacteria under anoxic conditions. The bacteria use the nitrate for energy, and in the process, release nitrogen gas. The nitrogen gas, a major constituent of air, is released to the atmosphere.
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Eutrophication: Causes, consequences, physical, chemical …
1. Introduction. The word 'eutrophic' originates from the Greek word eutrophos which means well-nourished. Eutrophication is described as a condition of an aquatic network with a high level of nutrient concentrations, that include nitrogen and phosphorus which result in algal blooms, thus degrading the water quality in the aquatic ecosystems …
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Impacts of sedimentation and nitrogen enrichment on …
T1 - Impacts of sedimentation and nitrogen enrichment on wetland plant community development. AU - Mahaney, Wendy M. AU - Wardrop, Denice H. AU - Brooks, Robert P. N1 - Funding Information: We thank Kurt A. Smemo, C. Andrew Cole, Peter Weishampel and two anonymous reviewers for comments on earlier drafts of this manuscript. Funding …
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Unit 2 Test
a - soil excavation and disposal. Zoning laws establish _______. a - what types of buildings can be built in an area. b - the uses an area of land can be put to. c - who can live in an area. d - the types of business that can occupy a building. b - the uses an area of land can be put to. Unit 2 Test - 96% Learn with flashcards, games, and more ...
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Microplastics affect sedimentary microbial …
These results indicate that nitrogen cycling processes in sediments can be significantly affected by different microplastics, which may serve as organic …
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Nitrogen removal in maturation WSP ponds via biological …
The nitrogen content in collected sediment samples varied from 4.17 to 6.78 percent (dry weight) and calculated nitrogen sedimentation rates ranged from 291 to 2,868 g N/ha d in M1 and from 273 to ...
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Phytoplankton responses to changing temperature and …
Given that nitrogen is the primary limiting nutrient for phytoplankton growth in the studied locations 26,27,50, the amount of nitrogen added in our experiments (2 µmol L −1) could be expected ...
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Growth of large-cell and easily-sedimentation microalgae
For the measurement of water quality, the microalgae culture was centrifuged (4000 rpm at 3 °C for 10 min) and the supernatant was filtered through a 0.45 μm membrane for use in the determination of COD (Chemical Oxygen Demand), nitrogen (total nitrogen, ammonium) and phosphorus (total phosphorus).
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Sediment organic matter properties facilitate …
The aims of this study were thus to: (1) quantify sediment gross N mineralization and NH 4 + immobilization rates; (2) quantify sediment potential N loss …
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Different characteristics of sediment nitrogen and
Sediment internal nutrient loading plays an important role in algal blooms. Thus, understanding the specific characteristics of nutrient (nitrogen (N) and phosphorus (P)) recycling from sediment is important for clarifying the processes and mechanisms of cyanobacterial growth and … See more
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Effective enrichment of anaerobic ammonia oxidation
The limited nitrite supply strategy promotes the sedimentation of anammox sludge without significantly affecting its growth rate, and effective sludge retention is crucial for enriching anammox sludge during initial cultivation. ... Anaerobic ammonia oxidation (anammox) is a high-efficiency and low-cost pathway for biological nitrogen removal ...
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Nitrogen sedimentation in a lake affected by massive nitrogen …
The ability of Chara meadows to act as a nitrogen source or sink was evaluated by the following methods: (1) investigating Chara growth, (2) nitrogen incorporation and decomposition laboratory ...
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Nitrogen removal in maturation waste stabilisation ponds …
Biological (mainly algal) uptake of inorganic nitrogen species and further sedimentation of dead biomass (together with its subsequent mineralization) is one of the major mechanisms controlling in-pond nitrogen recycling in maturation WSP, particularly when environmental and operational conditions are favourable for algal growth.
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Carbon sequestration potential of transplanted mangroves …
The mangrove (Kandelia obovata) in Ximen Island is an old plantation transplanted from Fujian Province (23°53′- 23°56′N, 117°24′ - 117°30′E) in 1957, and it is now the northernmost mangrove forest of China.The invasive S. alterniflora started around the 1990s and spread widely in Yueqing Bay in the following decades, with extensive …
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Impacts of sedimentation and nitrogen enrichment on …
Dissolved nitrogen and phosphorus in runoff from watersheds in conservation and conventional tillage. Journal of Soil and Water Conservation 40(1): 153–157. Google Scholar Barnes W.J. 1999. The rapid growth of a population of reed canarygrass (Phalaris arundinacea L.) and its impact on some riverbottom herbs. Journal of the Torrey …
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Effects of algal-derived organic matter on sediment …
Abstract. Nitrogen (N) mineralization and immobilization are two important N transformation processes in estuarine sediments. However, the biotic and abiotic …
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Quiz 12 | Quizlet
They are a signal that the plant needs more water. B. They contain bacteria that capture oxygen for the plant. C. They signal that the plant has been infected with a fungus and should be treated. D.***. They contain bacteria that capture nitrogen for the plant. Endomycorrhizae. 12 of 25.
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Influence of Atmospheric Phosphorus and Nitrogen Sedimentation …
It was found that the total nitrogen (TN) sedimentation flux has obvious seasonal variation, which was consistent with the variation trend of rainfall, and increased with the increase of rainfall. ... A large number of nitrogenous compounds caused by atmospheric subsidence have an important effect on the growth and population structure of ...
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Threats to Coral Reefs | US EPA
Sedimentation from coastal development, urban stormwater runoff, ... (nitrogen and phosphorous) from agricultural and residential fertilizer use, sewage discharges (including wastewater treatment plants and septic ... Consequently, coral growth and reef growth can be slowed, with some species affected more than others. If …
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Influence of sedimentation rate on the environmental
This is typically true in terms of infrastructure, market growth, and accessibility. ... The loss of nitrogen from seawater caused by sedimentation depends on two factors: the sedimentation rate and the amount of nitrogen contained in sinking particles (Zhang et al. 2015). These two factors together determine the loss of nitrogen …
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The phosphorus cycle (article) | Ecology | Khan Academy
The phosphorus cycle is slow. Most phosphorus in nature exists in the form of phosphate ion— PO 4 3 −. Phosphorus is often the limiting nutrient, or nutrient that is most scarce and thus limits growth, in aquatic ecosystems. When nitrogen and phosphorus from fertilizer are carried in runoff to lakes and oceans, they can cause eutrophication ...
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Frontiers | Concurrent Effects of Sediment Accretion and …
Sedimentation is generally more inhibiting to wetland plant growth than nutrient availability owing to induced hypoxia in the root zone and physical stress over apical meristems . Plant morphology is likely to adjust to the primary limiting factor when different environmental factors occur simultaneously ( Lenssen et al., 2003 ).
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Journal of Geophysical Research: Biogeosciences
Key Points. High organic matter concentration occurred in the finer fractions, in which the fractions provides insight into sediment organic matter source and composition. There is no correlation between the …
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Clay-bacteria interaction: Effect of bacterial cell density on
Shewanella oneidensis MR-1 (ATCC# 700550), a species commonly found in natural subsurface and aquatic environments, is used as the model bacterium.S. oneidensis MR-1 is a rod-shaped, gram-negative bacterium that can thrive under both aerobic and anaerobic conditions, as shown in Fig. 1 b. It secretes biofilms and electrically conductive …
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Nitrogen cycling and microbial cooperation in the …
Nitrogen-cycling mechanisms (e.g. ammonia oxidation, denitrification, dissimilatory nitrate reduction to ammonium) were prevalent and highly redundant, …
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Different characteristics of sediment nitrogen and
Purpose Sediment internal nutrient loading plays an important role in algal blooms. Thus, understanding the specific characteristics of nutrient (nitrogen (N) and phosphorus (P)) recycling from sediment is important for clarifying the processes and mechanisms of cyanobacterial growth and succession. Materials and methods …
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Effects of rainfall characteristics and sugarcane growth
High intensity rainfall in southern China has led to soil erosion on sloping farmland, causing serious ecological and environmental problems. But how the interaction of rainfall factors and growth stages influence soil erosion and nitrogen loss on sugarcane-cultivated slope under natural rainfall have not been studied considerably. This study …
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Wastewater treatment
Primary and secondary treatment of sewage, using the activated sludge process. Primary treatment removes material that will either float or readily settle out by gravity. It includes the physical processes of screening, comminution, grit removal, and sedimentation. Screens are made of long, closely spaced, narrow metal bars.
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