Modelling Stormwater Pollutant Reduction with LID Scenarios in SWMM

2018 ◽  
pp. 96-101 ◽  
Author(s):  
Camilla Tuomela ◽  
Daniel Jato-Espino ◽  
Nora Sillanpää ◽  
Harri Koivusalo
Keyword(s):  
Pollutant Reduction

scholarly journals Developing a population-state decision system for intelligently reprogramming extracellular electron transfer in Shewanella oneidensis

2020 ◽  
Vol 117 (37) ◽  
pp. 23001-23010 ◽  
Author(s):  
Feng-He Li ◽  
Qiang Tang ◽  
Yang-Yang Fan ◽  
Yang Li ◽  
Jie Li ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Bacterial Growth ◽  
Metabolic Flux ◽  
Expression System ◽  
Shewanella Oneidensis ◽  
Cellular Growth ◽  
Extracellular Electron Transfer ◽  
Regulation System ◽  
Growth State ◽  
Pollutant Reduction

The unique extracellular electron transfer (EET) ability has positioned electroactive bacteria (EAB) as a major class of cellular chassis for genetic engineering aimed at favorable environmental, energy, and geoscience applications. However, previous efforts to genetically enhance EET ability have often impaired the basal metabolism and cellular growth due to the competition for the limited cellular resource. Here, we design a quorum sensing-based population-state decision (PSD) system for intelligently reprogramming the EET regulation system, which allows the rebalanced allocation of the cellular resource upon the bacterial growth state. We demonstrate that the electron output from Shewanella oneidensis MR-1 could be greatly enhanced by the PSD system via shifting the dominant metabolic flux from initial bacterial growth to subsequent EET enhancement (i.e., after reaching a certain population-state threshold). The strain engineered with this system achieved up to 4.8-fold EET enhancement and exhibited a substantially improved pollutant reduction ability, increasing the reduction efficiencies of methyl orange and hexavalent chromium by 18.8- and 5.5-fold, respectively. Moreover, the PSD system outcompeted the constant expression system in managing EET enhancement, resulting in considerably enhanced electron output and pollutant bioreduction capability. The PSD system provides a powerful tool for intelligently managing extracellular electron transfer and may inspire the development of new-generation smart bioelectrical devices for various applications.

Turbocharged CNG Engines for Urban Transportation: Evaluation of Turbolag Reduction Strategies by Means of Computational Analyses

2009 ◽  
Author(s):  
Mirko Baratta ◽  
Ezio Spessa
Keyword(s):  
Public Transportation ◽  
High Performance ◽  
Exhaust Valve ◽  
Liquid Fuels ◽  
Transient Condition ◽  
Specific Reference ◽  
Engine Model ◽  
Spark Timing ◽  
Pollutant Reduction ◽  
1D Numerical Simulation

Nowadays, many urban buses for public transportation are fuelled by compressed natural gas (CNG), due to its potential for energy saving and pollutant reduction, with specific reference to particulate matter emissions. However, turbocharging is required to recover the gaseous-fuel related power gap with respect to more traditional engines running on liquid fuels. Therefore, turbolag reduction is fundamental to achieve high performance during engine transients. Significant support for the study of turbocharged CNG engines and guidelines for the turbomatching process can be provided by 1D numerical simulation tools. In this paper, the topic of turbolag reduction is analyzed, and different strategies, namely, Early-Exhaust Valve Opening-Variable Valve Actuation (E-EVO-VVA) and spark timing control for combustion retard (ComR), are analyzed by means of a specifically developed and calibrated GT-POWER® engine model. Tip-in maneuvers in which the engine was coupled to a torque hydraulic converter under stall conditions were investigated, so as to reproduce a typical load transient condition for an urban bus accelerating from engine idle. The best improvement of turbolag was obtained by combining E-EVO-VVA and ComR, with a reduction of turbolag ranging from 60% to 70%. When a limit on the incylinder pressure is introduced, in order to prevent excessive exhaust valve mechanical stresses, the higher achievable reduction in turbolag was found to be between 35% and 45%.

Establishment of refined sintering flue gas recirculation patterns for gas pollutant reduction and waste heat recycling

2019 ◽  
Vol 235 ◽  
pp. 1549-1558 ◽  
Author(s):  
Xiaohui Fan ◽  
Guojing Wong ◽  
Min Gan ◽  
Xuling Chen ◽  
Zhiyuan Yu ◽  
...  
Keyword(s):  
Flue Gas ◽  
Waste Heat ◽  
Flue Gas Recirculation ◽  
Pollutant Reduction ◽  
Gas Recirculation

scholarly journals Cross-Regional Comparative Study on Carbon Emission Efficiency of China’s Yangtze River Economic Belt Based on the Meta-Frontier

2019 ◽  
Vol 16 (4) ◽  
pp. 619 ◽  
Author(s):  
Ze Tian ◽  
Fang-Rong Ren ◽  
Qin-Wen Xiao ◽  
Yung-Ho Chiu ◽  
Tai-Yu Lin
Keyword(s):  
Economic Growth ◽  
Energy Consumption ◽  
Yangtze River ◽  
Energy Savings ◽  
Air Pollutant ◽  
Technology Gap ◽  
Emission Efficiency ◽  
Technology Gaps ◽  
Pollutant Reduction ◽  
Gap Values

The Yangtze River Economic Belt (YREB) is one of the most important areas for the economic growth of China, but rapid development has caused tremendous damage to the energy and ecological environments of the region. Very few studies have compared the carbon emissions of YREB with that of non-YREB and furthermore, have not considered regional differences and radial or non-radial characteristics in their analysis. This paper thus selects the energy consumption data of 19 provinces and cities in YREB and 19 provinces and cities in non-YREB from 2013 to 2016, constructs the modified meta-frontier Epsilou-based measure (EBM) data envelopment analysis (DEA) model and adds an undesirable factor, energy consumption, and CO2 emission efficiency of each province and city of the two regions. The results are as follows. (1) China’s provinces and cities have different energy efficiency scores in energy consumption, economic growth, and CO2 emissions. The regional ranks and technology gaps of five provinces and cities in non-YREB and of four provinces and cities in YREB exhibit a decline. Overall, the ranks and technology gaps of the provinces and cities in YREB are significantly lower than those in non-YREB, meaning that there is greater room for efficiency improvement in the latter region. (2) The gross domestic product (GDP) and CO2 efficiency values of non-YREB provinces present great differences, especially the CO2 efficiency value that ranges from 0.2 to 1, while their values in YREB are more balanced with little difference between provinces and cities. Thus, YREB is more coordinated in terms of energy savings and air pollutant reduction. (3) Some cities with good economic development such as Beijing, Shanghai, and Tianjin have regional and technology gap values of one, indicating that they not only target economic growth but also address energy savings and air pollutant reduction. The regional rank and technology gap values of some underdeveloped provinces such as Neimenggu, Ningxia, and Qinghai are also one. Finally, this research proposes countermeasures and recommendations to both areas.

Reductive characteristics of washed-off pollution loads by best management practices

2008 ◽  
Vol 58 (12) ◽  
pp. 2339-2346 ◽  
Author(s):  
Sung Ryong Ha ◽  
Seung Chul Lee
Keyword(s):  
Best Management Practices ◽  
Management Practices ◽  
Water Bodies ◽  
First Flush ◽  
Best Management ◽  
Korean Ministry ◽  
Pollutant Reduction ◽  
Treat All ◽  
Total Maximum ◽  
Pollution Loads

Best management practices (BMPs) were used to reduce the NPS in various fields. The Korean Ministry of Environment has developed a total maximum daily load (TMDL) and adapted it to prevent water resources from pollutants in four major rivers. However, many water bodies in Korea are still polluted. It is anticipated that the NPS pollution flows into the water bodies without treatment. Nowadays, BMPs are enforced to reduce the NPS pollutant in Korean TMDL.This paper analyzes the characteristics of the reduced pollution loads by two different BMPs. We also calculate the reduced pollutant mass and the reduced pollutant loading rate to help make a plan for the pollution reduction in the Korean TMDL.The characteristics of the pollutant reduction in the BMPs were revealed through analysis of the EMC, first flush phenomenon and reduced pollution loads. Integrated facilities which combined two facilities were more effective to reduce the pollutant than the single and it was better to remove the beginning of the runoff as a first flush effectively than treat all runoff in the facilities.

Non-point pollutant reduction in a paddy-field watershed using a circular irrigation system

1997 ◽  
Vol 31 (11) ◽  
pp. 2685-2692 ◽  
Author(s):  
I. Takeda ◽  
A. Fukushima ◽  
R. Tanaka
Keyword(s):  
Paddy Field ◽  
Irrigation System ◽  
Pollutant Reduction
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