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An essay about waste disposal
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Millions tons of waste are discharged worldwide every day; most of it is dumped in landfills or discharged to rivers and seas without prior treatment. However, while the demand for waste disposal capacities is increasing, the availability of suitable sites is on the decline. Waste has become a critical problem for industrial society, particularly in big cities and densely areas. Therefore, the need to avoid or reduce the waste and to recycle it will become an over important political and economic issue. However, disposal capacities will continue to decrease in spite of the reduction in the volumes of waste produced. For this reason it is necessary to coordinate and optimize waste management. One of these options is incineration. Incinerator emissions can be generalized into the following four categories: (1) particulate emissions; (2) gaseous emissions, such as sulfur dioxide (SO2), nitrogen oxides (NOx), carbon monoxide (CO), and hydrochloric acid (HCl); (3) metals; and (4) miscellaneous gas emission. Emitted gases such as SO2, HCl, and NO2 contribute heavily to acid rain and smog, and to the photochemical formation of ozone in smog in sunlight. SO2, NO2, and ozone have been proven to cause respiratory illness, and smog has been shown to cause increased death rate [1].
Various technologies to remove SO2 in flue gas have been studied. Dry and wet processes are commonly used. Dry process is superior to the wet one in terms (1) inexpensive, (2) easy handling, and (3) no produces of liquid waste. One of processes in dry process category is bag filter reactor that uses Ca(OH)2 as absorbent. However, this process posses shortcomings, i.e. low sorbent conversion and low gas separation efficiency [2].
To enhance the efficiency of gas ...
... middle of paper ...
...(calcination temperature = 800oC)
Figure 8 SEM micrographs of Ca(OH)2/DE sorbents: (a) DE and (b) Ca(OH)2/DE = 70:30
Figures 7 and 8 shows that the total porosity of the sorbent Ca(OH)2 is smaller than the sorbent Ca(OH)2/DE
4. Conclusion
The discussion of the results of this study can be concluded that the temperature, the stirrer speed and the reaction time has an important role on the conversion of the reaction between SiO2 with Ca(OH)2. The reaction temperature of 65oC produces the highest conversion, so it can be concluded that the reaction temperature is optimum at 65oC for the reaction between Ca(OH)2 with SiO2. The results also showed that the conversion reaches a constant at the reaction time of 20 minutes. The absorptive capacity of the Ca(OH)2/DE sorbent on methylene blue is greater than the absorptive capacity of Ca(OH)2 sorbent alone.
As the solution pH can influence the stability of NaClO-NH3 blend and the elimination of SO2, NOx, the impact of the pH of NaClO-NH3 blend solution on the instantaneous removal as well as the duration time was investigated, and the final pH after reaction was also detected and shown in Fig. 5. It can be seen that the variation of solution pH has a negligible effect on the desulfurization, but the elevated pH has a great promotion on the NOx removal, the efficiencies are significantly increased from 36% to 99% for NO2 in the pH range of 5–12 and from 19% to 65% for NO when the pH is between 5 and 10, after where, both of them are constant. Hence, the optimal pH of the NaClO-NH3 solution for the
Many people are unknowingly exposed to air pollution and have no idea. Some common causes of air pollution are automobiles, factories, landfills and toxic materials. Air pollution destroys the environment; it causes climate change because it greatly affects the greenhouse effect and it causes acid rain. Acid rain contaminates water and destroys animal’s homes. Air pollution has many effects on people it causes coughing, elevates your risk of asthma, wheezing, it can cause diseases and birth defects. It’s estimated “that seven million people died prematurely in 2012 from exposure to air pollution and that air pollution can cause cardiovascular diseases. The use of incinerators has caused protest movements from the Chinese citizens because they are becoming aware of the air pollution that is being given off from the burning of their trash and the effects it has on their health. There have been many reports of premature births and stillbirths of pregnant women that live near garbage incinerators”( Professional Safety, 2014, p.
Throughout one’s life, he or she will encounter an opportunity that will likely impact his or her perspective on a given situation. In Waste Land, Vik Muniz embraced the opportunity to travel to Jardim Gramacho in Brazil in hopes of making a difference with the pickers by incorporating the pickers as assistants for the art projects. While at the landfill in Rio de Janeiro, he experiences the life of the pickers which helps him to create the art that will transform the lives of the workers; these experiences allow Muniz to develop as a person (Walker). Vik Muniz’s perspective regarding the landfill and the pickers evolved from expressing pity to embracing the pickers as a group of friends.
Fossil fuels, such as coal and oil, are Carbon rich compounds, the combustion of which produces Carbon Dioxide, a pollutant and a greenhouse gas. A large amount of energy is released during this process, which is why the pollutants off products are tolerated. This process occurs constantly throughout the world, in power stations, vehicles and cooking ovens, leading to an immense volume of CO2 being released every second, 50% of which is absorbed by oceans (Oce...
The sulfur dioxide in environment mainly mainly comes from the direct combustion of fossil fuels including coal, petroleum, and so on. Meanwhile, the combustion of fossil fuels were the main sources of the sulfur dioxide in atmosphere. Generally speaking, the content of sulfur in cola was around 3%~5%. Unde the high temperature, most of the sulfur in fuels would be decomposed through being affected by the heat, and then the sulfur was oxidized to the sulfur dioxide, being released into the atmosphere. Based on data, billion of tones of fossil fuels were consumed in the world every year. These fossil fuels were burnt for electrical energy and heat thermal energy, but the sulfur content was oxidized to the sul...
In order to gain strong insight into the surface chemistry of silica we have perform a thorough literature search. Our goal is to identify the pioneer research performed on silica and silica supported catalyst. Particular interest lies in silica-water-cobalt and silica-alcohol-cobalt systems. This study is both on macro and micro level so that a complete theoretical base can be established. From this theoretical knowledge, key areas to look upon will be identified and a design of experiments will be established. The goal is to develop a both efficient and effective product (catalyst) using a novel methodology developed from past research.
Strong heating of calcium carbonate produces calcium oxide, CaO, and carbon dioxide. tlcQeA from tlcQeA coursewrok tlcQeA work tlcQeA info tlcQeA CaCO3(s) à ƒaO (s) + CO2 (g)coce cer sececew orce cek ince foce ce. Limestone is given the equation CaO, slaked lime is produced when CaO reacts with water, this is where further amount of H2O is added which turns this into a saturated aqueous solution known as limewater. Ca(OH)2 (aq) and is used for tests to show the presence of CO2.
Before we look at some alternative process' to help reduce or eliminate automobile pollution, we should try to understand how this occurs. This form of pollution is a direct result of the combustion process, also known as exhaust, and from fuel being evaporated into the atmosphere. The next step is to get a better understanding of the combustion process. The gasoline that we use to put into our cars are made of a mixture of hydrocarbons, hydrogen and carbon atoms. When we put the gasoline into our car, what is supposed ...
Compared to the 0.5 M hydrochloric acid that was less concentrated, the more concentrated 2 M hydrochloric acid c...
Over the last two centuries, humanity has become increasingly reliant on fossil fuels. Over that time, the consequences of constantly burning fossil fuels have accumulated into a threat to industrialized cities. The burning of fossil fuels causes acid rain to shower on cities and ecosystems around the world, tormenting their inhabitants. The increasingly deadly pollution caused by the burning of fossil fuels has caused the deaths of many people around the world by causing respiratory problems. Not only has the pollution worsened, but the supply of fossil fuels is not limitless – as humanity’s reliance increases the supply decreases, and that is all the more reason to break humanity’s reliance on fossil fuels. Fossil fuels should be replaced with cleaner alternatives because fossil fuels cause environmental hazards, are non-renewable, and are detrimental to human health.
The amount of hydrochloric acid. 3. The concentration of the hydrochloric acid. 4. The surface area of the calcium carbonate.
Waste incineration units produce a lot of carbon dioxide gas approximately around one third of the greenhouse gasses. It also impacts people’s health as they get exposed to the toxic emissions by breathing in the air or consuming contaminated food and water. Additionally, when the garbage gets burnt by the incinerators they end up as ashes which are then emitted from the chimneys, including the toxic materials and end up in specialist landfill sites for hazardous waste.
The emission of green house gasses due to human activity contributes the most in increasing global warming. Today, fossil fuels are used as a source of energy for transportation, electricity, industrial process and to increase human comfort in this era. Over the last decade humans have created mass amount of industries. These industries have been burning fossil fuels such as coal, which release carbon dioxide and carbon monoxide; carbon dioxide absorbs heat that raises the temperature of the earth. More than 80% of carbon dioxide comes from tr...
For the previous 200 years, the industrial revolution’s discovery of fossil fuels reigned supreme. (Benefits of Recycling, History of Alternative Energy) Newly developed factories continued their steady streams of production and our society started becoming larger consumers. To meet the increasing demand, more product had to be made, and this resulted in more waste being emitted into the atmosphere. These gases built up until they caused the ozone layer to thicken to the point where it started trapping the h...
Policy is needed to regulate which course of action should be taken and how it should be implemented. Because of this, many plans and policies revolving around the management of solid waste have been put in place. Sometimes however, a particular policy can have its shortfalls, potentially resulting in its negative aspects outweighing the positive ones. According to the Conference Board of Canada Report, “Canadians dispose of more municipal solid waste per capita than any other country” (2013). Solid waste management in particular, involves many aspects, ranging from packaging waste, food waste, etc. (White & Franke 1999), hence, the following analysis revolves around household and commercial waste – referred to as Municipal Solid Waste (White & Franke. 1999) – in the Greater Vancouver Regional District. Municipal waste is a major health and environmental concern as it contributes to numerous problems like habitat destruction, surface groundwater pollution, and other forms of air, soil, and water contamination. Waste disposal methods like incineration create toxic substances, and landfills emit methane, which contributes to global warming. According to the Zero Waste Objective Report, “The impact of climate change and the increasing awareness of the role of “waste” and “wasting” in the production of greenhouse gas emissions is a constant environmental pressure… (2009). This leads to an increasing limitation of government to prevent and control the volume and toxicity of products in the waste stream and a growing need to shift responsibility to the product manufacturer.