The Ela Regents College Critical Essay Sample

The Ela Regents College Critical Essay SampleAs a part of the Ela Regents College, they require students to write a critical essay during their Sophomore year of college. In this writing exercise, students are expected to analyze written documents that have been produced by either the US government or any other governmental agencies. In fact, there are some other criteria which the students need to be familiar with.The Ela Regents College requires the students to focus on the following areas in order to complete their Critical Essay. First and foremost, you should know that writing a Critical Essay is a time consuming process. In fact, the preparation for this type of essay is a tedious task that will occupy almost your entire time for about three or four months. So, if you are required to complete this kind of essay, it is important that you devote as much time as possible in this process.In fact, the essays are to be prepared on a set of guidelines that include the topics, format, and sample material for this type of essay. For example, you can start by considering the type of essay that you want to write and what topic you want to focus on. After you have identified this, you can start composing a pre-requisite research document. But before you begin preparing your document, you need to make sure that you know the correct information for your research.This is the reason why Ela is providing a sample essay to help you write your own essay. When you are researching for your essay, it would be better for you to pick up the sample essay which can be found in the collection of documents which are now available for you.Since, writing a Critical Essay is not an easy task, there are some guidelines that you need to keep in mind when you are going to use the Ela Regents College's Critical Essay Sample. In fact, all you need to do is to be familiar with the guidelines that can be followed for the preparation of this kind of essay.But before you start the essay writing process, it is important that you research first for the Ela's Critical Essay Sample. In fact, you can check the school's website, which is usually on a regular basis so that you can be aware of what types of materials that they provide. In fact, there are also a lot of resources that you can consult.After you are familiar with the resources that you can use for the essay, it is also important that you prepare all of the topics that you want to talk about. You can also prepare the outline of the essay, which can guide you in the process of preparing your essay. Once you are through with the outline, you can check for the reference material that you can refer to.In fact, the essay that you are going to write will also depend on the topic which you wrote earlier. And, if you want to write a history essay, it is important that you are familiar with the different topics that were used in the history. Therefore, it is important that you prepare a good history essay in order to be able t o create a good essay.

Wastewater Treatment Essays - Sewerage, Environmental Engineering

Wastewater Treatment The reason for me doing this report is because I could not attend class enough to grasp the concept of Wastewater Treatment. This report is an overview of each stage of the treatment of sewage. I have included a diagram of a typical sewage plant. A) Primary Treatment The wastewater that enters a treatment plant contains debris that might clog or damage the pumps and machinery. The material is removed by screens, and is burned or buried. The wastewater then passes through a comminutor (grinder), where all the organic material such as leaves are mushed smaller so that they can be removed later. 1) Grit Chamber Back in the day, long narrow channel-shaped settling tanks, known as grit chambers, were used to remove all the inorganic substances like sand, silt, gravel, and cinders. These chambers were made to allow inorganic particles 0.008 in. or bigger to settle at the bottom while the smaller particles and most of the organic material that remain in suspension pass through. Today, spiral-flow aerated grit chambers with hopper bottoms, or clarifiers with automatic scrapper arms are used. The grit is removed and disposed of as sanitary landfill. Grit build up can reach from 3 to 8 cubic feet per1 million gallons of wastewater. 2) Sedimentation With the grit removed, the wastewater goes into a sedimentation tank, where the organic materials removed. The method of sedimentation can remove about 20 to 40 percent of the biochemical oxygen demand and 40 to 60 percent of the suspended solids. The big boys in the industry use a chemical process known as coagulation and flocculation in the sedimentation tank. I really don't know much about this subject so I'm going to move on. 3) Flotation The alternative to sedimentation is a treatment called flotation, in which air is forced into the wastewater under pressures of 25 to 50 lbs per sq. in. The wastewater, is compressed with air, is then released into an open tank ; there the rising air bubbles cause the suspended solids to rise to the surface, where the are wisked away. Flotation can remove more than 75 percent of the suspended solids. 4) Digestion Digestion is a microbiological process that changes the chemically complex sludge to methane, carbon dioxide, and a harmless fertilizer. The reactions occur in a closed tank or digestor that is oxygen deficient. The transformation happens after a series of reactions. First the solid matter is made soluble by enzymes, then the substance is fermented by a group of acid-producing bacteria, reducing it to simple organic acids such as acetic acid. The organic acids are then resolved to methane and carbon dioxide by bacteria. The sludge that is to thick is heated and added to the digester as many times as possible, where it sits for 10 to 30 days and is decomposed. Digestion reduces organic matter by 45 to 60 percent. 5) Drying The digested sludge is place on sand beds for air drying. Air drying needs dry, warm weather for it to work. Some plants have shelters over the sand beds. Dried sludge in most cases is used as a fertilizer because of the 2 percent nitrogen and 1 percent phosphorus content. B) Secondary Treatment After removing 40 to 60 percent of the suspended solids and 20 to 40 percent of the BOD5 in the primary stage by physical resources, the secondary treatment biologically reduces the organic material that stayed in the liquid stream. Secondary treatment contains keeping and speeding up nature's process of waste disposal. Aerobic bacteria in the oxygen change the organic matter to stable forms such as CO2 , water, nitrates, and phosphates. The new organic material that is made is an indirect result of biological treatment processes, and is removed before the wastewater is dumped into the streams. 1) Trickling Filter In this process, a waste stream is sent over a bed or column of some type of porous medium. A sticky film of microorganisms coats the medium and acts as the removal agent. The organic matter in the waste stream is absorbed by the film and changed to carbon dioxide and water. If the trickling filter step comes before the sedimentation stage it can remove about 85 percent of the BOD entering the plant. 2) Activated Sludge This stage is an aerobic process that adds sticky sludge particles that have millions of of actively growing bacteria stuck together by a gelatinous slime. Organic matter is assimilated by the floc and changed to aerobic output. The reduction of BOD varies between 60 to