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Bioretention has been widely used to reduce stormwater runoff's hydrologic consequences, but it is now being relied on to handle chemical and biological pollutants carried by stormwater. In a stormwater runoff by bioretention, we investigated the treatment of fecal indicator bacteria and polycyclic aromatic hydrocarbons. PAH levels in column media cores were determined to determine the fate and transport of PAHs within the bioreation columns, as well as measuring soil PAHs. Compost appeared to be a source of PAHs in bioretention media for the first half as biochar-amended media first contained half of the u03a3PAHs as part of the standard 60:40 sand:compost mixture. A net decrease of u03a3PAHs in bioretention media throughout the study, which could not be explained by PAHs in the effluent, suggests that bioremediation by microbes and/or plants attenuated media PAHs.
Source link: https://doi.org/10.1016/j.jenvman.2022.116915
Climate change impacts are one of the global challenges that influence the intensity and frequency of rain. To measure the rainfall intensity, the future IDF curves for the periods and two GCMs were created and compared to the latest IDF curves, the old IDF curves were used to determine the variations in the rainfall intensity. Rain intensities for future climate conditions would differ from those for future durations and return periods, according to the researchers. For 2020-2040, 2041-2070, and 2071-2100, respectively, the comparison findings show that the relative increase between future rainfall intensities and historic rainfall ranges from 1. 5 to 31. 6%, 42. 6%, and 32. 4%. This report will help to better understand the effects of climate change on rainfall IDF relationships in Dodola, Ethiopia, as well as the design of new and future stormwater management systems.
Source link: https://doi.org/10.1007/s10661-022-10781-7
However, there is also no published literature on the use of electrochemical oxidation to enhance ARB removal in stormwater bioretention cells. H2O2 levels in the used bioretention cells increased at first and then decreased with the rise of current densities and A/W ratios. Both the highest A/W ratios in actual density and 48:1 were 6% of the one in the control, with 364. 5 percent and 48:1 respectively, suggesting that EO could be promising for the reduction of ARB removals in bioretention cells.
Source link: https://doi.org/10.1016/j.scitotenv.2022.160477
In a sewershed in Pittsburgh, the use of this strategy is evaluated using the EPA's Storm Water Management Model to simulate pipe flow. The number of nodes used to build the model was determined by the number of nodes used to build the model, which was a factor of the model's potential impact. When randomly reducing the number of nodes used to build the model, no statistical differences were found in model results. The Thiessen polygon method can be used to model urban stormwater models and create good pipe flow simulations even for sewer data limited scenarios, based on our findings.
Source link: https://doi.org/10.1007/s11356-022-24162-7
The green stormwater Infrastructure — a cost-effective land development strategy for controlling stormwater near the source — has a significant effect on urban planning and hydrological sustainability, as shown by the rational spatial distribution of Green Stormwater Infrastructure, which is an alternative land development strategy for managing stormwater near the source. However, evidence on evaluating planning from the perspective of supply-demand in GSI is also limited at this time. This paper developed an evaluation instrument for determining supply-demand levels in GSIs in Guangzhou, China, using the coupling coordination scheme, which includes Coupling Degree and Coordination Degree. The results indicated that GSI's supply and demand levels showed large geographical variations in distribution, with majority streets being in short supply. The findings of this report will assist the decision makers in determining the supply-demand levels in GSI and give a benchmark of plant allocation for Sponge City's sustainable construction.
Source link: https://doi.org/10.3390/ijerph192214742
Water shortages in these areas also persists. In a basin located in southern Brazil, this study intends to investigate the impact of rainwater harvesting in residential buildings on stormwater. Rainwater harvesting is also present in all residential buildings in the second scenario. In Bom Retiro sub-basin, the highest peak flow reduction occurred, but not in the sub-basin with the most extensive roof area; the highest peak flow reduction occurred in the sub-basin. More houses than multi-story residential buildings are found in Bom Retiro sub-basin. 8. 2% reduction in peak flow when considering the full possibility of rainwater harvesting for roof areas of all existing buildings in the Rio Cachoeira Basin's roof areas was 7. 2%. Rainwater tanks in residential buildings have no effect on stormwater runoff, according to the report, and when the area of the hydrographic basin is greater, the stormwater runoff will be less affected.
Source link: https://doi.org/10.1016/j.jenvman.2022.116814
Where eutrophication occurs, dissolved phosphorus treatment is often necessary to shield receiving waters, but no effective techniques exist. Both laboratory and limited field experiments have successfully treated DP in laboratory and limited field studies. The respective median effluent concentrations were 120, 25, and 75 percent for all paired influent-effluent samples, respective median total phosphorus, orthophosphate, and DP removal efficiency were 33 percent, 43 %, and 13 %, respectively; with two malfunctioning sites omitted, matched relevant goals and requirements. Nonetheless, phosphate removal success and effluent concentrations varied widely across IESFs and events. Hence, effluent concentrations may be more effective at removing efficiencies, and water quality crediting is of equal importance. Overall, the majority of IESFs in this multi-site review had a minimum phosphorus effluent concentration and less-so removal efficiency benchmarks, with some reaching or near phosphorus effluent concentrations and less-so, removal efficiency benchmarks.
Source link: https://doi.org/10.1016/j.scitotenv.2022.160177
During heavy and prolonged rainfall events, the overflow of stormwater retention basins may result in the immediate release of particulate pollutants and the remobilization of already contaminated particle-bound pollutants to receiving freshwater bodies. Consequently, we investigated the sediment pollutant load of two stormwater basins connected to its outfalls of two stormwater basins to determine the effect of the basins' discharges on the sediment's metal and organic pollutant content. Also, the potential adverse effects of the pollutant load on benthic dwellers were investigated in sediment toxicity tests with Lumbriculus variegatus, including the effects on growth, reproduction, and biomarkers catalase, acetylcholinesterase, and metallothionein were investigated, as well as the biomarkers catalase, acetylcholinesterase, and metallothionein. However, metal enrichment ratios showed contamination with Cu, Pb, and Zn at all locations above threshold effect concentrations. The retention basin samples were the most volatile compared to stream sediment, according to Ecotoxicity results.
Source link: https://doi.org/10.1016/j.scitotenv.2022.160185
Different low impact development options have been suggested to make cities more flood-proof, and recent research has emphasized the importance of flood risk mitigation and many other co-benefits that may be provided. Multilayer green roofs, or "blue roofs," are characterized by a high water retention capacity in comparison to traditional green roofs due to the presence of an additional storage layer that allows for monitoring discharge outflow and water storage. Through the introduction of new BGRs specific metrics, the investigation has mainly focused on the system's stormwater retention function, as well as investigating the relative contributions of the green layer and the storage layer to the overall retention capacity.
Source link: https://doi.org/10.1016/j.jenvman.2022.116643
Sumps are commonly used in urban stormwater systems, and they can be thought of as a basic pretreatment device for stormwater quality control. If the sediment bed surface depth was greater than a threshold value, the washout mass would have decreased exponentially with time; otherwise, the amount of washout would have been much less. For all the testing conditions, the same scour pattern was found, of which the greatest scour depth was always found below the outlet. Under conditions of high flow rates and low beds of sediment bed, the deposit below the inlet may rise.
Source link: https://doi.org/10.2166/wst.2022.329
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