Questions And Answers On Hazardous Wastes Environmental Sciences Essay

October 7, 2017 Environmental Sciences

Explain what is meant by a ‘secure ‘ and a ‘sanitary ‘ landfill. What advantages to they have over unfastened cavity landfills? Landfills which are disposing of risky waste on land can either be classed as secure or healthful. A secure landfill is where a line drive that may be either a permeable clay or plastic is used. This prevents escape from happening ( notes ref ) . This type of Landfill is monitored to do certain that the environing land H2O is non badly impacted on.

A Sanitary landfill is a different type of landfill. This landfill is where waste is ‘compacted and so covered day-to-day ‘ ( notes ref ) . By making this it prevents odours from being released into the environment and besides minimises any wellness issues. A disadvantage is that groundwater taint may happen if there is escape, however a big sum of waste can be disposed of utilizing this method ( Bank, 2000 ) .

An unfastened cavity landfill is practically a big hole in the land which is filled with rubbish ( Answers.com, 2010 ) . Sometimes the cavity is lined with clay ( Answers.com, 2010 ) . The advantages a secure and healthful landfill has over unfastened cavity landfills are that they do non supply engendering evidences for insects and gnawers which may impact the surrounding environment ( Centre, 2010 ) . Due to the exposure unfastened cavity landfills have to the environment, they create air pollution, and they may besides pollute land H2O and make run off pollution ( Centre, 2010 ) .

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Question 2 What is ‘fixation ‘ when applied to pre-treatment of wastes traveling to landfill. Why is it applied? What would be an appropriate arrested development method for an aqueous waste contaminated with lead?

When risky stuffs are disposed of in landfills it must be ensured that these stuffs are safe ( notes ref ) . If they are non they may necessitate pre intervention. If the insecure stuff ‘dissolves and flights from the landfill site it may pollute groundwater ‘ ( notes ref ) . In order to forestall this, immobilization techniques can be used. These techniques are besides called arrested development. Fixation is a technique that prevents leachate from get awaying the landfill site ( notes ref ) . As antecedently stated it is used to guarantee that groundwater is non contaminated.

An appropriate arrested development method for an aqueous waste contaminated with lead is utilizing phosphate stones ( Qi Ying Ma, 1995 ) . Phosphate stones respond and immobilize the lead in the aqueous solution ( Qi Ying Ma, 1995 ) .

Question 3 What types of waste can be discharged to the cloaca? What limitations need to be put on these discharges? Why are limitations necessary?

Normally biological waste is disposed of in the sewerage system, nevertheless ‘industries can be licensed to dispatch to the cloaca ‘ ( notes ref ) . Other types of waste that can be discharged into the cloaca must be types of waste that will non barricade the system nor cause injury to the environment. There are parametric quantities that restrict the sum of discharge that occurs daily and besides the existent belongingss of the waste determine whether it is suited to dispatch within the sewerage system. These limitations include things like the pH degrees of the liquid waste, temperature, quicksilver degrees and other contamination degrees ( ref notes ) . This is done to guarantee that the sewerage system does non transport this substance to an environment where it will harm worlds or damage its milieus.

Question 4 A rotary kiln is one type of incinerator used for wastes. Describe the operation of a rotary kiln. What kinds of wastes can be treated utilizing this procedure?

A rotary kiln rotates about its ain axis and has stuff fed into the kiln, which is a cylindrical organic structure ( Wikipedia, 2010b ) . Material is fed into the kiln where it is incinerated within the chamber. The waste is fed in at the highest terminal of the cylinder and easy travels through the chamber to see higher temperatures ( Group, 2010 ) . At the underside of the kiln the waste that has been incinerated is removed as ash. It must besides hold a inactive station burning chamber to guarantee that all of the flue gases are treated before let go ofing them into the ambiance ( Group, 2010 ) .

A huge assortment of wastes can be treated utilizing this procedure. Some of these types of waste are liquids, solids and exhausts, every bit long as they are decently incinerated and undergo station intervention to guarantee flue gases released will non harm the environment ( Advameg, 2009 ) .

Question 5 How is cyanide used in the excavation industry? Where has it been used? What jobs does it do and how can cyanide wastes be treated?

Cyanide is used chiefly in the gold excavation sector. ‘More than 90 % of the gold extracted yearly is done so with the assistance of nitrile ‘ ( Centre, 2009 ) . Crushed stone is sprayed with Na nitrile solution and this solution helps pull out the gold within the crushed stone heap out as it easy makes its manner through ( Centre, 2009 ) . Using cyanide allows gold atoms excessively little for human eyes to observe to be collected utilizing this chemical ( Centre, 2009 ) . This method has been used all around the universe in states such as Greece, Ghana, USA, Krgyzstan and Guyana ( Centre, 2009 ) . This type of solution causes many jobs to the environment due to its toxic nature. Methods that can be used for handling nitrile wastes are chlorination, acidification and chemical precipitation ( Richard G. Tyler, 1951 ) .

Question 6 Describe what kinds of pre-treatment could be used for aqueous wastes contaminated with oils. What advantages and disadvantages would these methods have?

Question 7 What is the Basel Convention and why was it set up? What is its significance in Hazardous Waste intervention?

The Basel Convention is an international pact ( Wikipedia, 2010a ) which was developed by the United National Environment Program ( Australian Government ; Department of Sustainability, 2008 ) . It was established to supervise and seek and forestall “ toxic bargainers ” from gaining ( Convention, 2005 ) . What these “ toxic bargainers ” do is seek to happen manners in which to transport toxic waste offshore to another state where they can dump waste for a cheaper monetary value ( Convention, 2005 ) . Its significance in Hazardous Waste intervention is that this convention encourages the production of less risky waste and besides sets ordinances onto how risky waste is controlled by supervising its method of disposal ( Australian Government ; Department of Sustainability, 2008 ) .

Question 8 Describe one method that has been used to dispose of a scheduled waste. If possible, give an illustration where this method has been applied.

Methods used to dispose of a agenda waste are liquefied media processes. This type of treating involves such procedures like liquefied metal, liquefied scoria or run salt ( Australian Government ; Department of Environment, 1997 ) . One of the procedures affecting utilizing liquefied metal has been used in Australia by Molten Metal Technology Inc. ( Australian Government ; Department of Environment, 1997 ) . ‘The liquefied metal procedure is called “ Catalytic Extraction Processing ” ‘ ( Australian Government ; Department of Environment, 1997 ) . This type of procedure utilizations molten metal bath at a temperature above the liquid ‘s thaw point is used to ‘dissociate wastes into their atomic components ‘ ( Australian Government ; Department of Environment, 1997 ) . The waste is inserted into a reactor normally utilizing O to feed it in. In this reactor lies the liquefied metal and the waste is fed through the underside of the reactor ( Australian Government ; Department of Environment, 1997 ) . It means that utilizing this method merely certain types of waste can be disposed of in this method, such as gases or liquids or really all right atoms ( solids ) ( Australian Government ; Department of Environment, 1997 ) . This type of method was proposed to be established in Botany, nevertheless this type of method has been established in Fall River, Massachusetts on a commercial degree ( Australian Government ; Department of Environment, 1997 ) .

Question 9 What are the comparative advantages and disadvantages of methods available to rectify contaminated dirt ( see merely non-biological methods ) ?

Question 10 What is ‘bioremediation ‘ and what are its advantages? Are there restrictions on where it can be applied?

Bioremediation in a method used to handle risky waste. It is a procedure ‘that uses micro-organisms or their enzymes to return the environment altered by contaminations to its original status ‘ ( Ltd, 2005 ) . This procedure contains assorted different subgroups of bugs that can be used depending on the type of waste that will be treated. It has legion advantages, such as being a method that can make locations that are usually hard to acquire to ( Ltd, 2005 ) . However this method is non suited for all state of affairss, such as state of affairss where there is excessively much wet and non plenty O, or if pH degrees or temperature are non within the scope needed for this procedure to happen ( Ref notes 2 ) . Competing beings or toxicity will besides greatly influence whether this type of intervention can be employed ( ref notes 2 ) .

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