scholarly journals Suppression of Soil Dust Emissions from Large-Scale Construction Sites Using Starch and Polyvinyl Alcohol

Author(s):  
Jong-Soo Choi ◽  
Dong-Su Kim ◽  
Yu-Lim Choi ◽  
Lakshmi Prasanna Lingamdinne ◽  
Janardhan Reddy Koduru ◽  
...  

Soil dust emitted from large-scale construction sites in urban areas impacts air quality and creates a severe health threat to residents. Water spraying is commonly practiced to lower dust emission in construction sites, but its long-term effectiveness is questionable. In this study the utility of starch, polyvinyl alcohol (PVA), and a blend of starch and PVA in various proportions was investigated for the suppression of soil dust emissions at construction sites in Seoul. The efficiency of each dust suppressant was tested with test soil samples in a laboratory-scale wind tunnel box under different concentrations of suppressants and soil textures. Starch and PVA showed superior ability to suppress soil dust emissions compared to moistening bare soil, resulting in PM10 lower than the daily limit values of 30 μg/m3. PVA showed higher soil dust suppression capability for all conditions over starch. Test soils sprayed with dust suppressants significantly improved aggregate stability compared to untreated soils.

2014 ◽  
Vol 11 (23) ◽  
pp. 6623-6632 ◽  
Author(s):  
O. Arnalds ◽  
H. Olafsson ◽  
P. Dagsson-Waldhauserova

Abstract. Iceland has extremely active dust sources that result in large-scale emissions and deposition on land and at sea. The dust has a volcanogenic origin of basaltic composition with about 10% Fe content. We used two independent methods to quantify dust emission from Iceland and dust deposition at sea. Firstly, the aerial extent (map) of deposition on land was extended to ocean areas around Iceland. Secondly, surveys of the number of dust events over the past decades and calculations of emissions and sea deposition for the dust storms were made. The results show that total emissions range from 30.5 (dust-event-based calculation) to 40.1 million t yr−1 (map calculation), which places Iceland among the most active dust sources on Earth. Ocean deposition ranges between 5.5 (dust event calculations) and 13.8 million tons (map calculation). Calculated iron deposition from Icelandic dust ranges between 0.567 and 1.4 million tons, which are distributed over wide areas (>370 000 km2) and consist of fine reactive volcanic materials. The paper provides the first quantitative estimate of total dust emissions and oceanic deposition from Iceland. Iron is a limiting nutrient for primary production in the oceans around Iceland, and the dust is likely to affect Fe levels in Icelandic ocean waters.


2020 ◽  
Vol 35 (2) ◽  
pp. 288-293
Author(s):  
V. M. Rychka

Described in Primary Chronicle under 912 the story of the unusual circumstances of the death of Kyiv pagan prince Oleh the Prophetic is connected to Kyiv topographic realities, contemporary for chronist, in particular, to the toponym «Oleh Tomb», also known from other sources. According to this chronicle Oleh Tomb was placed on the hill Shchekovytsya but the exact localization of the latter is not provided. In the middle of the 19th century Kyiv people called Shchekovytsya the high hill rising over the Podil on the west side. In the works of the later Kyiv scholars this hill was unequivocally identified with Chronicle Shchekovytsya where they localized the grave of Oleh. This view was challenged by P. G. Lebedyntsev who suggested localizate the Oleh Tomb not on Shchekovytsya / Skavitsya but on the western slope of the Starokyivsky Plateau, on Kudryavka, opposite the Lybid’ River, near the Zhidovsky (Lviv) Gate of Medieval Kyiv. Basing on the analysis of Kyiv Chronicle information the scientist concluded that the toponym «Oleh Tomb» is separated from Shchekovytsya in the annals. The explanation of this contradiction in the chronicle was proposed by one of the best experts in the historical topography of Old Kyiv — M. I. Petrov. He suggested that under the name of Shchekovytsya one should consider not only the Podil hill but also all surrounding ravines and highlands. The Shchekovytsya ridge of mountains and hills stretched from the east to the southwest from the present Shchekovitsa hill to the edge of the present Lviv Square. The common for whole this territory name Shchekovytsya became gradually decay due to the large scale construction of the city in the 18th century and the appearance of proper names of new urban areas. The version of the death and burial of Oleh in Ladoga where one of the central and largest hills got the name «Oleh Tomb» is still popular in historiography, especially Russian. This mound was explored by archaeologists. The cremation burial was discovered under the barrow. It was dated to earlier (9th century) time than the date of Oleh death. Because of the impossibility of this «grave» to be burial place of the Prince of Kyiv, G. S. Lebedev has proposed to consider it the «Oleh Hill» — a «ritual seat» which had some public and religious functions. Despite the hypothetical nature of such interpretation the ghost of Oleh finds the visible features in Ladoga. At the end of the last century in Old Ladoga the stone was erected on that mound with a memorial plaque proclaiming this site of the 9th—10th centuries «The tomb of Prince Oleh the Prophetic». The story of the death of Kyiv pagan prince Oleh the Prophetic «due to horse» contained in the Primary Chronicle under 912 was compilled, apparently, on the base of some archaic mythological song or historical anecdote. It wins over not its factual authenticity but psychological one. However, there is no reason to doubt that Oleh died in Kyiv. The death of the prince, who was crowned with warrior glory, prompted his followers to muse about the choice of a place for the building of the great barrow over his grave. The slopes of the Lysa Gora (Yurkovytsia), where the pagan necropolis had already been laid near Oleh courtyard, probably seemed them to be cramped. This may have been the reason for choosing among the highlands, which rise above the Podil, the beautiful terrain of Kudryavka in the upper reaches of the Hlybochytsa river. The barrow built in the 10th century was probably quite large which explains the relatively long life of «Oleh Tomb» in the Kyiv toponimic.


Author(s):  
Cristian Ciobanu ◽  
Irina Aura Istrate ◽  
Paula Tudor ◽  
Gheorghe Voicu

This paper presents aspects of monitoring material dust emissions from stationary emission sources (monthly dust measurements performed on cement mill stacks—mill outlet and separator outlet). Additionally, the Portland cement mill technological process (its component parts), as well as the solutions regarding the reduction of the air emissions level, following the emission limit values (VLE), established in the integrated environmental authorization (AIM) from a cement factory in Romania, were analyzed. The paper focused on analyzing the data obtained in three different years for PM10 and dust concentrations (2018–2020). For each year, the measurements have been done in 3 months, each in a different season. The average values for each year for working conditions were: 30.22 mg/m3 (2018), 27.38 mg/m3 (2019), and 27.51 mg/m3 (2020) for working conditions and for normal conditions: 34.22 mg/m3 (2018), 30.49 mg/m3 (2019), and 30.16 mg/m3 (2020). For all 3 years, the values measured in spring were higher than the other two, both for work and normal conditions.


T-Comm ◽  
2020 ◽  
Vol 14 (12) ◽  
pp. 58-65
Author(s):  
Dmitry S. Koptev ◽  
◽  
Ivan E. Mukhin ◽  

The development of modern civil and military aircraft is characterized by a rapid increase in the degree of functionality due to the requirements of today and the expansion of the scope of tasks to be solved. In military aviation, this feature is due to a significant expansion of the area of combat employment in terms of the enemy's active opposition, and in civil aviation, it can be explained by a large-scale implementation of technical means of flight control automation and landing under the conditions of high flights traffic in urban areas. In this regard, there was a fundamentally important transition from the separate design of airframes and components to the design of aircraft systems (AS) which represent a single complex system that solves many interdependent and interrelated tasks. Of course, such systems need technical diagnostics, real-time performance testing, and forecasting the remaining resource. This paper presents and describes the main scientific and technical ways to develop and create integrated airborne systems for providing flight safety of aircraft, including systems for monitoring the functional state of the pilot. The article considers the main methods and means for diagnostics and prognostics of the technical condition of an airframe and the critical units of aircraft. Their comparative analysis is carried out and a block diagram of an integrated diagnostic system is proposed. The essence of this system is to implement the procedure for accumulating flight data on the parameters of critical components and units on board aircraft and using a rapid-analysis method that involves monitoring the dynamics of changes in the trend of the controlled parameters in relation to limit values in real-time mode.


2014 ◽  
Vol 11 (4) ◽  
pp. 5941-5967 ◽  
Author(s):  
O. Arnalds ◽  
H. Olafsson ◽  
P. Dagsson-Waldhauserova

Abstract. Iceland has extremely active dust sources that result in large scale emissions and deposition on land and sea. The dust has volcanogenic origin of basaltic composition with about 10 % Fe content. We used two independent methods to quantify dust emission from Iceland and dust deposition on sea. Firstly, aerial extent (map) of deposition on land was extended to ocean areas around Iceland. Secondly, survey of number of dust events over the past decades and calculations of emissions and sea deposition for the dust storms were made. The results show total emissions range from 30.5 (dust event based calculation) to 40.1 million tons (map calculation), which places Iceland among the most active dust sources on Earth. Ocean deposition ranges between 5.5 (dust events calculations) and 13.8 million tons (map calculation). Calculated iron deposition from Icelandic dust ranges between 0.56 to 1.4 million tons, which are distributed over wide areas (> 370 000 km2) and consist of fine reactive volcanic materials. The paper provides the first quantitative estimate of total dust emissions and oceanic deposition from Iceland. Iron is a limiting nutrient for primary production in the oceans around Iceland and the dust is likely to affect Fe levels in Icelandic ocean waters.


2016 ◽  
Vol 16 (24) ◽  
pp. 15517-15528 ◽  
Author(s):  
Jie Zhang ◽  
Zhenjiao Teng ◽  
Ning Huang ◽  
Lei Guo ◽  
Yaping Shao

Abstract. Wind tunnel experiments of dust emissions from different soil surfaces are carried out to better understand dust emission mechanisms. The effects of surface renewal on aerodynamic entrainment and saltation bombardment are analyzed in detail. It is found that flow conditions, surface particle motions (saltation and creep), soil dust content and ground obstacles all strongly affect dust emission, causing its rate to vary over orders of magnitude. Aerodynamic entrainment is highly effective, if dust supply is unlimited, as in the first 2–3 min of our wind tunnel runs. While aerodynamic entrainment is suppressed by dust supply limits, surface renewal through the motion of surface particles appears to be an effective pathway to remove the supply limit. Surface renewal is also found to be important to the efficiency of saltation bombardment. We demonstrate that surface renewal is a significant mechanism affecting dust emission and recommend that this mechanism be included in future dust models.


2017 ◽  
Author(s):  
Siyu Chen ◽  
Jianping Huang ◽  
Nanxuan Jiang ◽  
Zhou Zang ◽  
Xiaodan Guan ◽  
...  

Abstract. Dust emissions refer to the spatial displacement of dust particles from wind forcing, which is a key component of dust circulation. It plays an important role in the energy, hydrological, and carbon cycles of the Earth's systems. However, most dust emission schemes only consider natural dust, neglecting anthropogenic dust induced by human activities, which led to large uncertainties in quantitative estimations of dust emissions in numerical modeling. To fully consider the mechanisms of anthropogenic dust emissions, both indirect and direct anthropogenic dust emission schemes were constructed and developed in the study. Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO) retrievals were used to constrain the simulations at global scale. The results showed that the schemes reasonably reproduced the spatio-temporal distributions of anthropogenic dust from 2007 to 2010. The high centers of anthropogenic dust emission flux appeared in India, eastern China, North America, and Africa range from 0.9 to 11 μg m−2 s−1. Compared with natural dust emissions, indirect anthropogenic dust emissions have indistinctive seasonal variation, with differences less than 3.2 μg m−2 s−1. Pasturelands contribute higher anthropogenic dust emissions than croplands, with emissions of approximately 6.8 μg m−2 s−1, accounting for 60 % of indirect anthropogenic dust emissions. Moreover, average anthropogenic dust emissions in urban areas have a value of 13.5 μg m−2 s−1, which is higher than those in rural areas (7.9 μg m−2 s−1). This study demonstrates that the environmental problems caused by anthropogenic dust in urban areas cannot be ignored.


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