phosphorus modeling Articles
-
Variability in the mobilization of sediment and phosphorus across 13 European soils
Received for publication January 25, 2008. The objectives of this study were to examine the variability in mobilization and transport of primary particles and associated total phosphorus (TP) in sediments eroded by overland flow from 13 European arable soils and to consider the empirical support for more process-based alternatives to modeling phosphorus (P) transfers. The 13 soils were subjected ...
-
Diffuse phosphorus models in the united states and europe: their usages, scales, and uncertainties
Received for publication February 3, 2008. Today there are many well-established computer models that are being used at different spatial and temporal scales to describe water, sediment, and P transport from diffuse sources. In this review, we describe how diffuse P models are commonly being used in the United States and Europe, the challenge presented by different temporal and spatial scales, ...
-
Preliminary analysis of phosphorus flow in Hue Citadel
Characteristics of waste and wastewater management can affect material flows. Our research investigates the management of waste and wastewater in urban areas of developing countries and its effects on phosphorus flow based on a case study in Hue Citadel, Hue, Vietnam. One hundred households were interviewed to gain insight into domestic waste and wastewater management together with secondary ...
-
Modeling the Praia dos Ingleses submarine outfall, Florianópolis, Santa Catarina, Brazil
An outfall 1,800 m long was initially proposed by CASAN (Water and Sanitation Company of Santa Catarina) to dispose of treated domestic residual water effluent from Praia dos Ingleses beach. The final plan average flow, estimated for the summer season is 0.1543 m³/s. The characteristics on the near field of the diffuser were calculated using the NRFIELD model supplied by a series of ...
-
Modeling Phosphorus in the lake Allatoona watershed using swat: II. Effect of land use change
Lake Allatoona is a large reservoir northeast of metropolitan Atlanta, GA, threatened by excessive algal growth. We used the calibrated Soil and Water Assessment Tool (SWAT) models developed in our companion paper to estimate the annual P load to Lake Allatoona in 1992 and in 2001 after significant changes occurred in land use. Land use data in 1992 and 2001 from the Multi-Resolution Land ...
-
Luxury uptake of phosphorus by microalgae in full-scale waste stabilisation ponds
Biological phosphorus removal was studied in two full-scale waste stabilisation ponds (WSP). Luxury uptake by microalgae was confirmed to occur and in one pond the biomass contained almost four times the phosphorus required by microalgae for normal metabolism. However, the phosphorus content within the biomass was variable. This finding means that assumptions made in prior publications on ...
-
Modeling Phosphorus in the lake Allatoona watershed using swat: I. developing Phosphorus parameter values
Lake Allatoona is a large reservoir north of Atlanta, GA, that drains an area of about 2870 km2 scheduled for a phosphorus (P) total maximum daily load (TMDL). The Soil and Water Assessment Tool (SWAT) model has been widely used for watershed-scale modeling of P, but there is little guidance on how to estimate P-related parameters, especially those related to in-stream P processes. In this paper, ...
-
Process-based modelling of phosphorus removal in a novel constructed wetland system using dewatered alum-sludge as substrate
A process-based model that can evaluate the transport and the fate of phosphorus (P) in agricultural wastewater was developed for a novel 4-stage dewatered alum sludge cakes (DASC) based constructed wetlands (CWs) system using STELLA software (version 9.1.4). The model considered adsorption, plant and microbial uptakes as the major forms of P involved in the transformation chains. The results ...
-
Updating a model of pulp and paper wastewater treatment in a partial-mix aerated stabilization basin system
A relatively simple set of calculations was presented in 1994 to evaluate the effectiveness of each ASB cell as reactor, clarifier, and digester. The steady-state model, which incorporated estimates of solids settling and benthal feedback of BOD5 and nutrients, has been a reasonable diagnostic tool for municipal and industrial applications. Results have aided in understanding normal system ...
-
Nonpoint-source nitrogen and phosphorus behavior and modeling in cold climate: a review
Pollution from nonpoint-source (NPS) nitrogen (N) and phosphorus (P) are the main causes of eutrophication in lotic, lentic and coastal systems. The climate of cold regions might play an important role in disturbing environmental behavior of NPS N and P, influencing simulation of watershed scale hydrologic and nonpoint-source pollution models. The losses of NPS N and P increase in regions of cold ...
-
Application of a catchment water quality model for an East–Australian catchment
This paper presents the calibration of a catchment water quality model developed for the continuous simulation of stormwater pollutants from a catchment to the catchment outlet. Calibration of the model was performed using the rainfall and water quality data collected for 'Saltwater Creek Catchment' in Gold Coast, Australia. Runoff estimations from the hydrologic model were compared with ...
-
Removal of chemical oxygen demand and dissolved nutrients by a sunken lawn infiltration system during intermittent storm events
Urban surface water runoff typically contains high but varying amounts of organic matter and nutrients that require removal before reuse. Infiltration systems such as sunken lawns can improve water quality. However, there is currently insufficient information describing the treatment efficiency of lawn-based infiltration systems. In this study, novel sunken lawn infiltration systems (SLISs) ...
-
Estimation of build-up and wash-off models parameters for an east-Australian catchment
This paper presents calibration of a catchment water quality model for continuous simulation of the water quality parameters from a catchment to the catchment outlet. The model is an integration of two sub-models: the hydrologic model and the water quality model. The hydrologic model estimates the amount of surface water runoff generated from the catchment during the storm event/ events. The ...
-
Re-oligotrophication as a challenge for tropical reservoir management with reference to Itaparica Reservoir, São Francisco, Brazil
The process of reservoir eutrophication has been recognised as a central problem in tropical reservoir environmental quality. Effects of eutrophication are complex interactions involving a decrease in water quality, especially loss of aquatic biodiversity, occurrence of undesired species such as cyanobacteria with its cyanotoxins, mass development of macrophytes such as Egeria densa with its ...
-
Advances in Research on Precise Biological Targeting Mechanisms of Nanomaterialsgeting Mechanisms of Nanomaterials
Li Hongchang's research group at the Nanomedicine Technology Research Center of Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Yu Xuefeng's research group at the Material Interface Research Center and Li Yang's research group at the Polymer Drug Research Center discovered a new mechanism for precision biomolecular targeting of nanomaterials. The relevant research results ...
By Matexcel
-
Modelling impacts of seasonal wastewater treatment plant effluent permits and biosolid substitution for phosphorus management in catchments and river systems
The issues of diffuse and point source phosphorus (P) pollution in river systems are presented using a catchment model to assess nutrient behaviour, seasonal effluent standards and biosolid substitution. A process-based, dynamic water quality model (INCA-P) has been applied to four UK catchments, namely, the Rivers Tywi, Wensum, Lunan and Hampshire Avon, to simulate water fluxes, sediments, ...
-
Study on Fully Coupled Activated Sludge Model No. 1 (FCASM1) for wastewater treatment biological processes
Nowadays many types of model based on the Activated Sludge Models (ASMs) have been developed. Most of them supposed that all the substrate removal processes are independent. Based on the mechanism of the interaction among microorganisms and considering the interaction among the processes of organisms oxidation, nitrifying, denitrifying and biological phosphorus removal, Fully Coupled Activated ...
-
A novel model for cyanobacteria bloom formation: the critical role of anoxia and ferrous iron
SUMMARY A novel conceptual model linking anoxia, phosphorus (P), nitrogen (N), iron (Fe) and sulphate to the formation of noxious filamentous and colonial cyanobacteria blooms is presented that reconciles seemingly contradictory ideas about the roles of P, N and Fe in bloom formation. The model has several critical concepts: (i) P regulates biomass and productivity in fresh waters until ...
-
Vertical flow constructed wetlands: kinetics of nutrient and organic matter removal
The kinetics of organic matter and nutrient removal in a pilot vertical subsurface wetland with red ferralitic soil as substrate were evaluated. The wetland (20 m2) was planted with Cyperus alternifolius. The domestic wastewater that was treated in the wetland had undergone a primary treatment consisting of a septic moat and a buffer tank. From the sixth week of operation, the performance of ...
-
Climate change impact on nutrient loss in regions with pronounced winter seasons
Eutrophication manifested by massive algal blooms is the most acute problem in many coastal waters and lakes around the world. The main source of phosphorus and nitrogen transport in the region studied, the Baltic Sea basin, is agriculture. Several studies have predicted adverse climate change impact on eutrophication problems. Here we show that in regions with a climate characterized by ...
Need help finding the right suppliers? Try XPRT Sourcing. Let the XPRTs do the work for you