Modeling the potential impacts of CO2sequestration on shallow groundwater: The fate of trace metals and organic compounds before and after leakage stops

Abstract The merits of activated carbon for removal of organic compounds from wastewater have been well documented in the literature. On the other hand there is a lack of published data on the use of activated carbon for the removal of trace metals from wastewater. Experiments were designed to assess the possibility that activated carbon treatment would remove aluminum, cadmium, chromium, cobalt, copper, iron, lead, manganese, mercury, nickel, silver and zinc from wastewater. All metals studied were tested over the pH range 3-11. Greater than 99.5% removal was achieved by pH adjustment and activated carbon treatment for most of the metals tested.

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Species and characteristics of volatile organic compounds emitted from an auto-repair painting workshop

Scientific Reports ◽

10.1038/s41598-021-96163-4 ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

M. Y. Song ◽

H. Chun

Keyword(s):

Volatile Organic Compounds ◽

Organic Compounds ◽

Large Scale ◽

Butyl Acetate ◽

Small Scale ◽

Indoor Environments ◽

Voc Emissions ◽

Volatile Organic ◽

Before And After ◽

Adsorption Systems

AbstractVolatile organic compounds (VOCs) are secondary pollutant precursors having adverse impacts on the environment and human health. Although VOC emissions, their sources, and impacts have been investigated, the focus has been on large-scale industrial sources or indoor environments; studies on relatively small-scale enterprises (e.g., auto-repair workshops) are lacking. Here, we performed field VOC measurements for an auto-repair painting facility in Korea and analyzed the characteristics of VOCs emitted from the main painting workshop (top coat). The total VOC concentration was 5069–8058 ppb, and 24–35 species were detected. The VOCs were mainly identified as butyl acetate, toluene, ethylbenzene, and xylene compounds. VOC characteristics differed depending on the paint type. Butyl acetate had the highest concentration in both water- and oil-based paints; however, its concentration and proportion were higher in the former (3256 ppb, 65.5%) than in the latter (2449 ppb, 31.1%). Comparing VOC concentration before and after passing through adsorption systems, concentrations of most VOCs were lower at the outlets than the inlets of the adsorption systems, but were found to be high at the outlets in some workshops. These results provide a theoretical basis for developing effective VOC control systems and managing VOC emissions from auto-repair painting workshops.

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Characteristics of marine shipping emissions at berth: profiles for particulate matter and volatile organic compounds

Atmospheric Chemistry and Physics ◽

10.5194/acp-18-9527-2018 ◽

2018 ◽

Vol 18 (13) ◽

pp. 9527-9545 ◽

Cited By ~ 22

Author(s):

Qian Xiao ◽

Mei Li ◽

Huan Liu ◽

Mingliang Fu ◽

Fanyuan Deng ◽

...

Keyword(s):

Volatile Organic Compounds ◽

Organic Compounds ◽

Mass Spectrometer ◽

Elemental Carbon ◽

Atmospheric Stability ◽

Diesel Oil ◽

Human Populations ◽

Volatile Organic ◽

Before And After ◽

The Impact

Abstract. Emissions from ships at berth play an important role regarding the exposure of high density human populations to atmospheric pollutants in port areas; however, these emissions are not well understood. In this study, volatile organic compounds (VOCs) and particle emissions from 20 container ships at berth were sampled and analyzed during the “fuel switch” period at Jingtang Port in Hebei Province, China. VOCs and particles were analyzed using a gas chromatography-mass spectrometer (GC-MS) and a single particle aerosol mass spectrometer (SPAMS), respectively. VOC analysis showed that alkanes and aromatics, especially benzene, toluene and heavier compounds e.g., n-heptane, n-octane and n-nonane, dominated the total identified species. Secondary organic aerosol (SOA) yields and ozone (O3) forming potential were 0.017 ± 0.007 g SOA g−1 VOCs and 2.63 ± 0.37 g O3 g−1 VOCs, respectively. Both positive and negative ion mass spectra from individual ships were derived and the intensity of specific ions were quantified. Results showed that elemental carbon (35.74 %), elemental carbon–organic carbon mixtures (33.95 %) and Na-rich particles (21.12 %) were major classes, comprising 90.7 % of the particles observed. Particles from ship auxiliary engines were in the 0.2 to 2.5 µm size range, with a peak occurring at around 0.4 µm. The issue of using vanadium (V) as tracer element was examined, and it was found that V was not a proper tracer of ship emissions when using low sulfur content diesel oil. The average percentage of sulfate particles observed in shipping emissions before and after switching to marine diesel oil remained unchanged at 24 %. Under certain wind conditions, when berths were upwind of emission sources, the ratios before and after 1 January were 35 and 27 % respectively. The impact of atmospheric stability was discussed based on PM2.5 and primary pollutant (carbon monoxide) concentration. With a background of frequent haze episodes and complex mechanisms of particulate accumulation and secondary formation, the impact of atmospheric stability is believed to have been weak on the sulfate contribution from shipping emissions. The results from this study provide robust support for port area air quality assessment and source apportionment.

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Seasonal and Spatial Variation of Volatile Organic Compounds in Ambient Air of Almaty City, Kazakhstan

Atmosphere ◽

10.3390/atmos12121592 ◽

2021 ◽

Vol 12 (12) ◽

pp. 1592

Author(s):

Olga P. Ibragimova ◽

Anara Omarova ◽

Bauyrzhan Bukenov ◽

Aray Zhakupbekova ◽

Nassiba Baimatova

Keyword(s):

Air Pollution ◽

Volatile Organic Compounds ◽

Organic Compounds ◽

Power Plants ◽

Ambient Air ◽

Spatial Variations ◽

Primary Sources ◽

Volatile Organic ◽

Seasonal And Spatial Variations ◽

Before And After

Air pollution is one of the primary sources of risk to human health in the world. In this study, seasonal and spatial variations of multiple volatile organic compounds (VOCs) were measured at six sampling sites in Almaty, Kazakhstan. The seasonal and spatial variations of 19 VOCs were evaluated in 2020, including the periods before and after COVID-19 lockdown. The concentrations of 9 out of 19 VOCs had been changed significantly (p < 0.01) during 2020. The maximum concentrations of total VOCs (TVOCs) were observed on 15, 17, and 19 January and ranged from 233 to 420 µg m−3. The spatial distribution of TVOCs concentrations in the air during sampling seasons correlated with the elevation and increased from southern to northern part of Almaty, where Combined Heat and Power Plants are located. The sources of air pollution by VOCs were studied by correlations analysis and BTEX ratios. The ranges of toluene to benzene ratio and benzene, toluene, and ethylbenzene demonstrated two primary sources of BTEX in 2020: traffic emissions and biomass/biofuel/coal burning. Most of m-, p-xylenes to ethylbenzene ratios in this study were lower than 3 in all sampling periods, evidencing the presence of aged air masses at studied sampling sites from remote sources.

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New analytical methodology for studies of treatment procedures of landfill leachates - experiences from a pilot plant study

Linnaeus Eco-Tech ◽

10.15626/eco-tech.2005.027 ◽

2019 ◽

pp. 273-275

Author(s):

Lennart Mårtensson ◽

Staffan Bergström ◽

Britt-Marie Svensson ◽

Lennart Mathiasson

Keyword(s):

Organic Compounds ◽

Pilot Scale ◽

Chemical Oxidation ◽

Landfill Leachates ◽

Analytical Methodology ◽

Msw Landfill ◽

Analytical Protocol ◽

Low Concentrations ◽

Before And After ◽

Treatment Procedures

In this study we have in pilot scale tested different methods for treatment of leachate from amunicipal solid waste (MSW) landfill, Only to focus on sum parameters, nutrients and metalswhen designing treatment methodology for landfill leachate is not enough, it is also importantto measure the content of toxic organic compounds in low concentrations, However, it is notpractical to analyse all substances in the leachate and for making evaluation of treatmentsfeasible our own analytical protocol was created, The efficiency of tested treatmentprocedures was evaluated by measuring changes in concentrations of a number of chosenparameters and organic compounds before and after treatment The treatment methods testedthat showed the highest efficiency towards organic pollutants in leachate were ozonetreatment and chemical oxidation with Fenton's reagent However, more natural basedmethods like filtering the leachate through a bed with peat mixed with carbon containingbottom-ash showed promising results.

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A Case Study: The Effect of Flooring Renovation with Adsorptive Cloth on the Residual Emissions of 2-ethyl-1-hexanol and C9-C10 Alcohols

E3S Web of Conferences ◽

10.1051/e3sconf/202017223009 ◽

2020 ◽

Vol 172 ◽

pp. 23009

Author(s):

Miia J. Pitkäranta ◽

Timo Lehtimaa

Keyword(s):

Organic Compounds ◽

Indoor Air ◽

Determination Limit ◽

Emission Rates ◽

Surface Emission ◽

Volatile Organic ◽

Before And After ◽

Storey Building ◽

Air Concentrations

This paper presents a renovation case study of a multi-storey building with initially elevated indoor air concentrations of 2-ethyl-1-hexanol and C9-C10 alcohols originating from PVC flooring. The main aim of the study was to determine the effectivity of renovation that included the use of a novel renovation material, cTrap adsorption cloth, in reducing the surface emissions and indoor air concentrations of the named compounds. Indoor air concentrations and surface emission rates of volatile organic compounds (VOC) were measured in the case building before and after renovation according to ISO16000-6 and NT Build 484 standards. The results show that the measured indoor air concentrations of the alcohols decreased to ca. 1/10 of the original concentration, and the surface emission rates dropped below the determination limit after the renovation.

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