Lexikon
A Venturi scrubber is designed to effectively use the energy from the inlet gas stream to atomize the liquid being used to scrub the gas stream. This type of technology is a part of the group of air pollution controls collectively referred to as wet scrubbers. Venturi scrubbers are used to remove very fine dust and mist, and can also remove gases. They rely on high velocity airflow in the scrubber to atomise water and remove particles down into the submicron range.
Venturi scrubbers can have the highest particle collection efficiencies (especially for very small particles) of any wet scrubbing system.
They are the most widely used scrubbers because their open construction enables them to remove most particles without plugging or scaling. Venturis can also be used to absorb pollutant gases; however, they are not as efficient for this as are packed or plate towers.
Venturi scrubbers have been designed to collect particles at very high collection efficiencies, sometimes exceeding 99%. The ability of venturis to handle large inlet volumes at high temperatures makes them very attractive to many industries; consequently, they are used to reduce particulate emissions in a number of industrial applications.
67/548/EEC regulation uses the following riks-phrases for characterisation of the risk of dangerous chemical substances.
Risk Phrases
R1: Explosive when dry
R2: Risk of explosion by shock, friction, fire or other sources of ignition
R3: Extreme risk of explosion by shock, friction, fire or other sources of ignition
R4: Forms very sensitive explosive metallic compounds
R5: Heating may cause an explosion
R6: Explosive with or without contact with air
R7: May cause fire
R8: Contact with combustible material may cause fire
R9: Explosive when mixed with combustible material
R10: Flammable
R11: Highly flammable
R12: Extremely flammable
R14: Reacts violently with water
R15: Contact with water liberates extremely flammable gases
R16: Explosive when mixed with oxidising substances
R17: Spontaneously flammable in air
R18: In use, may form flammable/explosive vapour-air mixture
R19: May form explosive peroxides
R20: Harmful by inhalation
R21: Harmful in contact with skin
R22: Harmful if swallowed
R23: Toxic by inhalation
R24: Toxic in contact with skin
R25: Toxic if swallowed
R26: Very toxic by inhalation
R27: Very toxic in contact with skin
R28: Very toxic if swallowed
R29: Contact with water liberates toxic gas.
R30: Can become highly flammable in use
R31: Contact with acids liberates toxic gas
R32: Contact with acids liberates very toxic gas
R33: Danger of cumulative effects
R34: Causes burns
R35: Causes severe burns
R36: Irritating to eyes
R37: Irritating to respiratory system
R38: Irritating to skin
R39: Danger of very serious irreversible effects
R40: Limited evidence of a carcinogenic effect
R41: Risk of serious damage to eyes
R42: May cause sensitisation by inhalation
R43: May cause sensitisation by skin contact
R44: Risk of explosion if heated under confinement
R45: May cause cancer
R46: May cause heritable genetic damage
R48: Danger of serious damage to health by prolonged exposure
R49: May cause cancer by inhalation
R50: Very toxic to aquatic organisms
R51: Toxic to aquatic organisms
R52: Harmful to aquatic organisms
R53: May cause long-term adverse effects in the aquatic environment
R54: Toxic to flora
R55: Toxic to fauna
R56: Toxic to soil organisms
R57: Toxic to bees
R58: May cause long-term adverse effects in the environment
R59: Dangerous for the ozone layer
R60: May impair fertility
R61: May cause harm to the unborn child
R62: Possible risk of impaired fertility
R63: Possible risk of harm to the unborn child
R64: May cause harm to breast-fed babies
R65: Harmful: may cause lung damage if swallowed
R66: Repeated exposure may cause skin dryness or cracking
R67: Vapours may cause drowsiness and dizziness
R68: Possible risk of irreversible effects
Combinations
R14/15: Reacts violently with water, liberating extremely flammable gases
R15/29: Contact with water liberates toxic, extremely flammable gases
R20/21: Harmful by inhalation and in contact with skin
R20/22: Harmful by inhalation and if swallowed
R20/21/22: Harmful by inhalation, in contact with skin and if swallowed
R21/22: Harmful in contact with skin and if swallowed
R23/24: Toxic by inhalation and in contact with skin
R23/25: Toxic by inhalation and if swallowed
R23/24/25: Toxic by inhalation, in contact with skin and if swallowed
R24/25: Toxic in contact with skin and if swallowed
R26/27: Very toxic by inhalation and in contact with skin
R26/28: Very toxic by inhalation and if swallowed
R26/27/28: Very toxic by inhalation, in contact with skin and if swallowed
R27/28: Very toxic in contact with skin and if swallowed
R36/37: Irritating to eyes and respiratory system
R36/38: Irritating to eyes and skin
R36/37/38: Irritating to eyes, respiratory system and skin
R37/38: Irritating to respiratory system and skin
R39/23: Toxic: danger of very serious irreversible effects through inhalation
R39/24: Toxic: danger of very serious irreversible effects in contact with skin
R39/25: Toxic: danger of very serious irreversible effects if swallowed
R39/23/24: Toxic: danger of very serious irreversible effects through inhalation and in contact with skin
R39/23/25: Toxic: danger of very serious irreversible effects through inhalation and if swallowed
R39/24/25: Toxic: danger of very serious irreversible effects in contact with skin and if swallowed
R39/23/24/25: Toxic: danger of very serious irreversible effects through inhalation, in contact with skin and if swallowed
R39/26: Very Toxic: danger of very serious irreversible effects through inhalation
R39/27: Very Toxic: danger of very serious irreversible effects in contact with skin
R39/28: Very Toxic: danger of very serious irreversible effects if swallowed
R39/26/27: Very Toxic: danger of very serious irreversible effects through inhalation and in contact with skin
R39/26/28: Very Toxic: danger of very serious irreversible effects through inhalation and if swallowed
R39/27/28: Very Toxic: danger of very serious irreversible effects in contact with skin and if swallowed
R39/26/27/28: Very Toxic: danger of very serious irreversible effects through inhalation, in contact with skin and if swallowed
R42/43: May cause sensitization by inhalation and skin contact
R48/20: Harmful: danger of serious damage to health by prolonged exposure through inhalation
R48/21: Harmful: danger of serious damage to health by prolonged exposure in contact with skin
R48/22: Harmful: danger of serious damage to health by prolonged exposure if swallowed
R48/20/21: Harmful: danger of serious damage to health by prolonged exposure through inhalation and in contact with skin
R48/20/22: Harmful: danger of serious damage to health by prolonged exposure through inhalation and if swallowed
R48/21/22: Harmful: danger of serious damage to health by prolonged exposure in contact with skin and if swallowed
R48/20/21/22: Harmful: danger of serious damage to health by prolonged exposure through inhalation, in contact with skin and if swallowed
R48/23: Toxic: danger of serious damage to health by prolonged exposure through inhalation
R48/24: Toxic: danger of serious damage to health by prolonged exposure in contact with skin
R48/25: Toxic: danger of serious damage to health by prolonged exposure if swallowed
R48/23/24: Toxic: danger of serious damage to health by prolonged exposure through inhalation and in contact with skin
R48/23/25: Toxic: danger of serious damage to health by prolonged exposure through inhalation and if swallowed
R48/24/25: Toxic: danger of serious damage to health by prolonged exposure in contact with skin and if swallowed
R48/23/24/25: Toxic: danger of serious damage to health by prolonged exposure through inhalation, in contact with skin and if swallowed
R50/53: Very toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment
R51/53: Toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment
R52/53: Harmful to aquatic organisms, may cause long-term adverse effects in the aquatic environment
R68/20: Harmful: possible risk of irreversible effects through inhalation
R68/21: Harmful: possible risk of irreversible effects in contact with skin
R68/22: Harmful: possible risk of irreversible effects if swallowed
R68/20/21: Harmful: possible risk of irreversible effects through inhalation and in contact with skin
R68/20/22: Harmful: possible risk of irreversible effects through inhalation and if swallowed
R68/21/22: Harmful: possible risk of irreversible effects in contact with skin and if swallowed
R68/20/21/22: Harmful: possible risk of irreversible effects through inhalation, in contact with skin and if swallowed
R-Phrases no longer in use
R13: Extremely flammable liquefied gas.
R47: May cause birth defects.
accordibng to REACH, a substance fulfils the very bioaccumulative criterion when:
– the bioconcentration factor is greater than 5 000.
The assessment of bioaccumulation shall be based on measured data on bioconcentration in
aquatic species. Data from freshwater as well as marine water species can be used.
See also bioaccumulative substance, vPvB substances
according to REACH regulation a substance fulfils the very persistent criterion when:
– the half-life in marine, fresh- or estuarine water is higher than 60 days, or
– the half-life in marine, fresh- or estuarine water sediment is higher than 180 days, or
– the half-life in soil is higher than 180.
See also: persistent substance and very Persistent and very Bioccumulative Substances
substances of very high concern, which are very persistent (very difficult to break down) and very bio-accumulative in living organisms. Annex XIII defines criteria for the identification of vPvBs and Annex I lays down general provisions for their assessment. vPvBs may be included in Annex XIV and by that be made subject to authorisation. (Source: REACH Glossary)
Video Graphics Array (640 x 480)
a periodic motion of small amplitude and high frequency, characteristic of elastic bodies.
vitrification is a technology which uses an electric current to melt contaminated soil at elevated temperatures (1,600 to 2,000°C or 2,900 to 3,650°F). Upon cooling, the vitrification product is a chemically stable, leachresistant, glass and crystalline material similar to obsidian or basalt rock. The high temperature component of the process destroys or removes organic materials. Radionuclides and heavy metals are retained within the vitrified product. Vitrification may be conducted in situ or ex situ.
abbreviation for Volatile Organic Compounds. There are several VOCs among hydrocarbons, such as BTEX.
organic compounds that evaporate readily into the air. In the Hungarian air-regulation VOCs are defined as organic compounds, with higher vapour pressure than 0.01 kPa on 293.15 oK.
VOCs include substances such as benzene, toluene, methylene chloride, and methyl chloroform.
extrusive igneous rocks are formed at the Earth crust's surface as a result of the partial melting of rocks within the mantle and crust. The melt, with or without suspended crystals and gas bubbles, is called magma. When it REACHes the surface, magma extruded onto the surface either beneath water or air, is called lava. The lava cools and solidifies almost instantly when it is exposed to the relatively cool temperature of the atmosphere. Quick cooling means that mineral crystals don't have much time to grow, so these rocks have a very fine-grained or even glassy texture. Hot gas bubbles are often trapped in the quenched lava, forming a bubbly, vesicular texture. In terms of the composition the volcanic rocks are classified in three large groups: basalts (greyish black coloured), andesites (greyish, redbrown coloured), rhyolite (white coloured). In Hungary basalt rocks are to be found in the Balaton and Salgótarján area, while andesite rocks extend from the North Danube area to the Mátra. The Zemplén mountains are mostly made up of rhyolites and partly by andesites. See also volcanic rock, magmatic rock
Volatile petroleum hydrocarbons, that is the GRO (Gasoline Range Organics) consists of hydrocarbons containing between 6 and 10 carbon atoms and includes aromatic compounds, alkanes, cycloalkanes and branched alkanes. Approximately 40% of the hydrocarbons in fresh petrol are monoaromatic compounds such as benzene, toluene and ethylbenzene (BTEX). GRO is usually measured by headspace analysis or by purge and trap method. The sum of GRO and DRO gives TPH.
Wide Area Network
the European Union defines waste as an object the holder discards, intends to discard or is required to discard is waste under the Waste Framework Directive (European Directive 75/442/EC as amended).
Once a substance or object has become waste, it will remain waste until it has been fully recovered and no longer poses a potential threat to the environment or to human health."
"any substance or object which the producer or the person in possession of it, discards or intends or is required to discard but with exception of anything excluded from the scope of the waste Directive".
waste hierarchy refers to the 3Rs of reduce, reuse and recycle, which classify waste management strategies according to their desirability. The 3Rs are meant to be a hierarchy, in order of importance.However in Europe the waste hierarchy has 5 steps: reduce, reuse, recycle, recovery and disposal.
The waste hierarchy has taken many forms over the past decade, but the basic concept has remained the cornerstone of most waste minimisation strategies. The aim of the waste hierarchy is to extract the maximum practical benefits from products and to generate the minimum amount of waste.
Some waste management experts have recently incorporated a "fourth R": "Re-think", with the implied meaning that the present system may have fundamental flaws, and that a thoroughly effective system of waste management may need an entirely new way of looking at waste. Source reduction involves efforts to reduce hazardous waste and other materials by modifying industrial production. Source reduction methods involve changes in manufacturing technology, raw material inputs, and product formulation. At times, the term "pollution prevention" may refer to source reduction.
Another method of source reduction is to increase incentives for recycling.
Source reduction is typically measured by efficiencies and cutbacks in waste. Toxics use reduction is a more controversial approach to source reduction that targets and measures reductions in the upstream use of toxic materials. Toxics use reduction emphasizes the more preventive aspects of source reduction but, due to its emphasis on toxic chemical inputs, has been opposed more vigorously by chemical manufacturers.
Source: http://en.wikipedia.org/wiki/Waste_hierarchy
waste incineration is a disposal method that involves combustion of waste material. Incineration and other high temperature waste treatment systems are sometimes described as "thermal treatment". Incinerators convert waste materials into heat, gas, steam and ash.
Incineration is carried out both on a small scale by individuals and on a large scale by industry. It is used to dispose of solid, liquid and gaseous waste. It is recognized as a practical method of disposing of certain hazardous waste materials (such as biological medical waste). Incineration is a controversial method of waste disposal, due to issues such as emission of gaseous pollutants.
Incineration is common in countries such as Japan where land is more scarce, as these facilities generally do not require as much area as landfills. Waste-to-energy (WtE) or energy-from-waste (EfW) are broad terms for facilities that burn waste in a furnace or boiler to generate heat, steam and/or electricity. Combustion in an incinerator is not always perfect and there have been concerns about micro-pollutants in gaseous emissions from incinerator stacks. Particular concern has focused on some very persistent organics such as dioxins, furans, PAHs,... which may be created within the incinerator and afterwards in the incinerator plume which may have serious environmental consequences in the area immediately around the incinerator. On the other hand this method or the more benign anaerobic digestion produces heat that can be used as energy.
Source: http://en.wikipedia.org/wiki/Waste_management
land out of crop for longer time.
waste management is the control of the collection, treatment and disposal of different wastes. This is in order to reduce the negative impacts waste has on environment and society. There are many waste types, notably including municipal solid waste, industrial and commercial waste, and hazardous waste.
waste prevention is the preferred approach of the integrated waste management.
If we create less waste, we consume fewer resources and we don't have to spend as much money to recycle or dispose of our waste. Individuals and businesses can often save a significant amount of money through waste prevention.
Waste prevention means reusing things, instead of buying new stuff. It also means "reducing." When a company reduces the amount of packaging for a product, that's called "source reduction," which is a form of waste prevention. Reducing toxics is also waste prevention.
waste reuse means that the discarded items or its elements are used again. Initiatives include hand-me-downs, garage sales, quilting, and composting (nutrients).
Waste recycling means that waste are separated into materials that may be incorporated into new products. This is different from reuse in that energy is used to change the physical properties of the material. Initiatives include composting, beverage container deposits and buying products with a high content of post-consumer material.
Type of waste recycling is capturing useful material from waste to energy programs. Includes methane collection, gasification and digestion, etc.
Incineration means high temperature destruction of material. Differs from gasification in that oxygen is used; differs from burning in that high temperatures consume material efficiently and emissions are controlled.
a bioreactor landfill operates to rapidly transform and degrade organic waste. The increase in waste degradation and stabilization is accomplished through the addition of liquid and air to enhance microbial processes. This bioreactor concept differs from the traditional "dry tomb" municipal landfill approach.
A bioreactor landfill is not just a single design and will correspond to the operational process invoked. There are three different general types of bioreactor landfill configurations:
- Aerobic - Leachate is removed from the bottom layer, piped to liquids storage tanks, and recirculated into the landfill in a controlled manner. Air is injected into the waste mass, using vertical or horizontal wells, to promote aerobic activity and accelerate waste stabilization.
- Anaerobic - Moisture is added to the waste mass in the form of recirculated leachate and other sources to obtain optimal moisture levels. Biodegradation occurs in the absence of oxygen (anaerobically) and produces landfill gas. Landfill gas, primarily methane, can be captured to minimize greenhouse gas emissions and for energy projects.
- Hybrid (Aerobic-Anaerobic) - The hybrid bioreactor landfill accelerates waste degradation by employing a sequential aerobic-anaerobic treatment to rapidly degrade organics in the upper sections of the landfill and collect gas from lower sections. Operation as a hybrid results in an earlier onset of methanogenesis compared to aerobic landfills.
The Solid Waste Association of North America (SWANA) has defined a bioreactor landfill as "any permitted Subtitle D landfill or landfill cell where liquid or air is injected in a controlled fashion into the waste mass in order to accelerate or enhance biostabilization of the waste." The U.S. EPA is currently collecting information on the advantages and disadvantages of bioreactor landfills through case studies of existing landfills and additional data so that EPA can identify specific bioreactor standards or recommend operating parameters.
Source: US-EPA, Clu-In − http://www.clu-in.org/techfocus/default.focus/sec/Bioreactor_Landfills/cat/Overview/
a discrete and significant element of surface water such as a lake, a reservoir, a stream, river or canal, part of a stream, river or canal, a transitional water or a stretch of coastal water.