Analysis Of The Mare Chicose Landfill Environmental Sciences Essay

Analysis Of The Margon Chicose Landfill Environmental Sciences EssayThe purpose of this research was to take a shit an overview of how a landfill is being managed. To be more than knowledgeable of the techniques that is being put in practice for a good concern. In addition, to identify the negative cause of landfill to workers, the population and environments.A site visit at M ar Chicose Landfill was conducted for that purpose. With the jockstrap of an Engineer the details were being explained and in that locationof help in the refi nining of our checklistFrom the results, two import ant points were found Landfill Gas and leachate pond which are major factors which need more attention to avoid negative effects.A Landfill which is not properly managed causes a lot of riddles to the wellheadness, contamination of ground pee supply, odours, and umteen health effects.1.1 Objective of the researchA site visit was conducted at maria Chicose Landfill, in order to construct a n overview of how a landfill is managed.The purpose of the visit consists of identifying the hazards of the landfill present with evaluation and calculation of the jeopardizes.Furthermore, the view measures that are being adopted and to watch out if the measures are adequate.2. Literature Review2.1 Definition of tempestuousAccording to Taylor and Allen (1) any material which is of no further use lowlife be regarded as go through. Human activities produced elopes materials. superabundance management philosophies outlined that most mess ups shadower be reused or recycled. Waste atomic number 50 be classified into lusty, liquid, louse upeous. initiations of solid wastes admit residential, commercial, institutional, construction and demolition, municipal wastes, treatment plant sites, industrial, agricultural (Tchobanoglous 1993). With the increase in population rate during the last decades, the generation of waste has accelerated, due to industrialisation and urbanizati on and what is more, with the developments of technology and science to a fault (Cardinali Richard, 2001). Increase in standard of living has given rise to waste generation and efficient and effective subdue measures need to be implemented so as not to deteriorate the health of people and the environment (Khalil Nadeem, Khan Mubashra, 2009). It has been a great concern and whatever(prenominal) attention has been given internationally on this issue. all(prenominal) country has different waste hierarchy and options due to different geography, cultures, environment among early(a)s. (Pitt Michael, 2005). According to a novel study carried out in UK (reported in Recycling World, October 2000) Austria, Netherlands, Sweden, Germany growth in convalescence and recycling exceeds the growth in waste. Followed by Denmark and Switzerland but in the remit lane are France, UK, and Norway where on that point use of landfill has increased. (Cardinali Richard, 2001).2.2 Integrated Solid Wa ste guidance and Waste HierarchyTherefore in the light of these growing concerns many professionals have proposed theories and solutions as to how the pollution can be minimized (Halawani et al.1993).Also, in an attempt to reduce the final volumes of wastes and to have sufficient funds for waste management the recycling process and recovery material can be used to get funds for waste management whereby, the Integrated Solid Waste Management (ISWM) comes into the picture. Integrated Solid Waste Management (ISWM) is a framework that helps us to understand waste management and most importantly how to reduce wastes.(1)http//www.Taylor and AllenTherefore, it proposes a Waste Management Hierarchy for the best solution that put waste management options in order of sustainability, from the most favoured option to the least desired one. (Shown in range 1).The Waste Management Hierarchy is a list of approaches to managing waste, arranged in order of preferability. The Environmental Protecti on Acts of most Australian States treats the Waste Hierarchy as a core principle and the UK Environment Agency supports the Waste Hierarchy as a general guide to selecting the best option for dealing with waste. However, despite the fact that it is widely used throughout the developed world, some critics have questioned the effectiveness of the model is actually implemented. For instance, in Australia implementation of the hierarchy has been patchy, with most movement to date focused on recycling and composting (Gertsakis and Lewis, 2003).Figure 1 Sustainability and The Waste Management Hierarchy (adapted from J.Gertsakis and H Lewis, 2003)Also in an attempt to reduce waste, the prexy of the US Senate Environment and Public Works committee, suggest that manufacturers must(prenominal) take full responsibility of their products from the whole life cycle of the products and when it becomes waste also thus reducing the burdens on the municipalities (Cardinali, 2001).Both the develop ed and developing countries have experienced accidents due to releases of hazardous wastes(UNEP,1994,FEPA,1991Shaw,1992)At the international level, the awareness regarding waste began in 1992 with the Rio Conference, where efficient handling of waste was priority of the Agenda 21.The Johannesburg World Summit on Sustainable Development in 2002 focused on initiatives to accelerate the shift to sustainable using up and production and the reduction of alternative degradation, pollution and waste by giving priority to waste reduction recycling, reuse followed by the safe disposal of waste .Therefore, as a measure of precaution it is in the best interest for most countries to make landfill as the last resort and option.2.3 Overview of LandfillsLandfill is the cheapest method for disposal of waste it is immensely used by many countries. Solid wastes, is any unwanted or discarded solid item. Municipal Solid Waste comes from homes, businesses and other urban areas. But the heavy dependen cy on the landfill has led to filling up of most landfill sites. Example in America before 1988, 80% of MSW were disposed of in landfills. By 2009 four or five landfills in operation lead be full and the cost of a new one cost approximately $90 zillion (Anonymous, 1992). According to Dr. W.L. Rathje, a garbologist at the University of Arizona, he gave this shocking testimony to the scale of modern landfills at a governmental hearing, quoting thatI was told that the largest commemoration ever built by a New World civilization was the Temple of the Sun, built in Mexico almost 2000 years ago. It occupied thirty million cubic feet. I can still remember my shock when my students told me that A San Francisco landfill, do up of two mounds compiled since 1977 solely out of cover dirt and the MSW from trinity cities, held seventy million cubic feet, a total of nearly five Sun Temples. Landfills are clearly the largest refuse heaps in the world.Since land is a scarce resource, at that placefore the European union has sensitized many countries on the need to use sustainable methods .In this context therefore, the waste hierarchy (consisting of waste minimization, reuse, recovery recovery such as energy recovery from incineration and finally disposal to landfill) and the BPEO (Best Practicable Environmental Option) are widely encourage to be used. Even though the amount of waste has diminished still the amounts of waste disposed of to landfill have increased (Pitt Michael, 2005).2.31 Zero landfillZero waste is a philosophy that promotes the re creation of resource life cycles so that all products are reused. Any wastes sent to landfills are minimal. Zero waste is not only about recycling but also avoiding landfills and preventing from waste production itself. The paradox is that the proportion of waste going into landfill may decrease but the volumes of Municipal solid waste are increasing ant that too in excess of 3 percent yearly for many developed nations (Doug las, 1992). The concept of zero landfill can never be achieved fully because there will be still a minimum of waste generated therefore landfill will always continue to exist.2.32 Landfill ManagementAfter being landfilled the waste decomposes into chemical substance substance and biological processes normally taking more than 50 years. But during the degradation process the solid waste generates 0.2 m3 of contaminated wastewater known as leachate, which in turn depending on the climate (amount of peltingfall) and types of waste its colour varies from black to brown .Rainfall plays a very important role in creating leachates. Factors affecting leachates are age, precipitation, seasonal weather variation, waste types and composition. Leachate include several(prenominal) parameters such as COD,BOD5, organic carbon, ammonia nitrogen , chlorides, iron manganese, phenols and AOX but little or no phosphorus.(2).Therefore pretreatment of leachate is vital. manipulation of leachate constit utes of Leachate chanelling Combined treatment with domestic sewage, Recycling, Biological treatment aerobic or anaerobic, chemical precipitation to remove heights strength of ammonium nitrogen. CW (constructed wetland) is, however, a comparatively new approach to eliminating environmental pollution, found on purification of waste waters with halophytes planted in an artificial wetland and employing the self-cleaning ability of ecosystems for its biological treatment process. Presently, some hundred CWs are in operation in Europe (Bulc et al., 1998)CappingOnce cell is filled to maximum of waste, it is cover to prevent the ledger entry of precipitation (rainfall) and the circumvent of gas, odour and introduction of further leachate. more thanover, can place soil over the capping or covering for a better protective covering. Two types of sealing liner polymeric geomembranes and geosynthetic clay liners. Caps should include a drainage story above and a gas collection layer betwee n the caps lining system.Leachate pond affect groundwater if leakage. More polluted groundwater will be discharged into streams wetlands and lakes.2.33 Landfill Gas and FlaringIt is formed from the biodegradation of wastes. It normally occurs at elevated temperatures and eventually it will be saturated with water vapour. The major components of LFG are methane and carbon dioxide. Methane is an odourless gas and travelling away from sites can cause landfills emptys when combines with air in certain proportions.Three processes by which landfill gas occursBacterial decomposition, volatilization, and chemical reactions.The volume of landfill gas produced at a site depends on these factors waste composition, age of refuse, presence of oxygen in the landfill, moisture content, and temperature.Source (2) httpwww.scitopics.comFigure 2 Typical Gas Composition at an engineered Landfill Site. (Adapted from Environment Agency November 2002)The purpose of landfill gas burn is to dispose of the flammable constituents safely and furthermore to avoid negative effects caused by odours,Care must be interpreted in the management of LFG so as toReduce impact on air quality Gas does not spread beyond the perimeter of the site, to avoid landfill fires, to permit energy recovery and also to avoid odour and health insecuritys.2.34 Important points to be considered in the design of a landfill and facilities required inside the landfill areNature and quantities of waste, water control, operational and restoration requirements, construction effects must be considered ,risk assessment, protection of soil and water, leachate management, gas control and Environmental nuisances. Moreover, the access of the landfill, the opening hours, types of wastes accepted should be marked and displayed at the entrance. In addition to that proviso of an office plus the first aid area, bathing and toilet facilities, lockers, mess rooms, waste reception area ,store, parking area and a wheel clearer is natural for preventing mud from being carried out on the public road lastly the provision of adequate water supply in type of fire.2.35 Health effects on LandfillingLandfills should be the last resorts due to the scarcity of lands and many health problems encountered through it. There is a large bole of literature on the authority adverse health effects of different waste management options. Example in a research done by (Saffron Lisa, 2003) it has been found that 220 papers have been published about the health effects from landfill sites. Many studies have been made on human populations about the hazards to health from landfill sites (Pitt Michael, 2005) but 101 are based on health impacts of landfill sites and 23 about health impacts of contaminated drinking water. Six papers discovered the evidence linking health effects with landfill sites. (Vrijheid M, 2000), revealed that health problems associated include respiratory symptoms, irritation of the skin, nose and optics, gas trointestinal problems, fatigue, headaches. Environmental (Vrijheid M, 2000).These studies was conducted in order to look for a link between landfill sites and the following health outcomes Reproductive outcomes(31studies),Cancer(29), psychosocial impacts(19), health problem not specified in abstract(14),mortality(5), injuries poisoning(2).Also EPA, revealed that many problems which occurred are because of the poor management of landfills. Most often theses problems are long term and include workable contamination of the groundwater and pop water regimes, among others. According to recent research, it was found that women who live near landfill sites has an elevated risk of having a baby with congenital malformations and also suffers from stress, fatigues, headaches, eye transmittals or irritations, coughs, stuffy noise, dry throat, and nausea and spontaneous abortions.(www//bmj.com).Also the other health impacts associated according to another research done by an international diary (Saffron lisa et al. ,2003) revealed that there is an increased risk of contracting cancer and also it contribute to global warm up and loss of biodiversity as well and the depletion of non-renewable resources. In addition, mentioned was made in this journal that people living near and far off the sites contracts nearly same types of health problems. Each people immune systems are different one can be more resistant while the others can be less. Research on Landfill site in Nant-y-Gwyddon revealed that an increase rate in congenital abnormalities in residents near the site, but it has been challenged by (Roberts et al 2000).They were also suffering from stress, fatigues, headaches, eye infections or irritation, coughs, stuffy nose, dry throat and nausea and spontaneous abortions. Also the carry prevalence of gastoschisis seems to be increasing internally and nationally. The main weakness of the studies about landfill health effects is the complete lack of exposure data. Wher e the hazards from landfill sites have been identified, as is the case in the National Priorities List sites in the USA, it is possible to estimate exposure using the EPA Human Exposure Model (Wolfinger, 1989). The results of this type of analysis are enigmatical and are based on risky assumptions. These remain estimates, not data. Most often theses problems are long term and include possible contamination of the groundwater and surface water regimes, odour, noise and visual nuisances (EPA). In an international journal (Saffron lisa,2003) revealed that there is an increased risk of contracting cancer and also it contribute to global warming and loss of biodiversity as well and the depletion of non-renewable resources, mentioned was made in this journal that people living near and far off the sites contracts nearly same types of health problems. Each people immune systems are different one can be more resistant while the others can be less.Figure3 Components of landfill (adapted fro m Department of Environmental preservation New York)The above figure shows the components and how the landfill has been design considering the different layers from the top to the bottom. In order to promote rainfall exsert-off away from the landfill a 24-inch thick barrier protection layer composition of soil and overlying 6 inches of vegetation topsoil serve to prevent the underlying geomembrane. To avoid again infiltration of rainfall a 60 mm geomenbrane along with the underlying low permeability clay layer are placed, thus this is done to avoid generation of additional leachate. anchor or gravel together with pipe lines are being placed so as to collect landfill gasses generated by decomposition waste. It is then followed by the waste mass, where all the waste is stock till decomposition. It is obvious that waste which contains water generate leachate therefore a primary leachate collection with pipe in place, so as to prevent the contamination of deep water sources a 60mm thi ck geomembrane underlines the leachate collection system and on the bottom of landfill syrong textile component to make a composite liner. However, another secondary leachate collection pipe is present after structural fill to avoid completely the leachate underground contamination. The final is a moldable geomembrane is to protect again the soil and the deep water sources. This design serves to protect the environment from contaminants which may be present in the municipal solid waste. The landfill siting plan, which prevents the siting of landfills in environmentally sensitive areas, as well as on-site environmental monitoring systems, which monitor for any sign of groundwater contamination and for landfill gas, provide additional safeguard.2.36 specifically Engineered Landfill (Basel Convention UNEP)At the start of the project, proper planning shall be carried out considering that the landfill would not cause harm either to people or environment. Therefore laid-back standard of controlling measures shall be put in place and establish control procedures which would monitor and even anticipate what to do after all cells have been filled. Hazardous waste must be disposed off before reaching the landfill and it can be done by either incineration or physio chemical processors.2.37 Health and sanctuary aspects associated with solid waste managementAll activities in solid waste management involve risk. From the place of collection to the final exhibit in landfill risk is directly associated. However, we need to quantify the risk and identify the main hazard which may cause harm to people thus having a direct impact on the business. risk of exposure which exists and is liable to cause disablement to our health safety and even welfare and can be categorized in the following context Disease, injuries and accidentDisease -Illnesses which comprise of infectious disease, allergies, respiratory damage and even cancer. Some disease is derived from direct injections of infectious micro-organisms, others involve infection through contamination of the food chain, whereby animals or other vectors have ingested infectious micro-organismsInjuries joint and spinal damage, fractures, puncture wounds, damage to eyes and ears and other part of the bodyAccidents- slides from unstable disposal piles, cave-ins of disposal site surfaces, fires, explosions, being caught in processing equipment, and being run over by mobile equipmentThe workers are greatly receptive to the various risk at the landfill are specially, those who get involves in the segagation process. This practice is good for the recycling processes but its health consequence is beard up by workers. Those workers are exposed to fecal matters, saturated toxic materials, bottle with chemical residues, metals containers with residues pesticides and solvents, needle and bandages from hospital, battery containing heavy metals, not to forget the pollution caused by the mechanised vehicles which is inhale by the workers. Moving into more details the occupational illnesses and health consequences which cause tremendous nuisance to the workers exposed in a landfill are-The risk of vibration from heavy vehicles cause damage to the back and joint also the lifting of waste fill containers can damage our spine in the long run and if over- exposed very detrimental in the short runFrom our respiratory ingestion of particulates bio-aerosol, and volatile organic are penetrated in our system through our routes of entryInfection are being caused from direct contact with contamination material, dog and rodent bites, or eating of waste fed animalsWounds punctured or bruised can contribute or cause health problems like tetanus, hepatitis, and HIV infections.Frequent head and nausea are caused from anoxic condition where disposal sites have high methane, CO2 and carbon monoxide.The consequences of burning metals arise the risk of lead poisoning.(Sandra Cointreau,2006)2.38 The need for risk assessment in a landfillRisk assessment is important in a landfill as it contributes in the planning process. Strategic goals are being evaluated based on the risk assessment carried out. The identification of hazards is essential so as to mitigate the various risks present in the landfill. Engineering and administrative control would be based on the risk assessment done and this show the gloom or severity of the hazard present in the landfill. This is done in order to mitigate the negative impact on environment. Risk assessment in a landfill would comprise of undergoing to find ways how to control or even reduce the deterioration of ecological system, As the analysis of two major areas obstinate health and environmental effects of exposure to hazardous chemical and failure of complex technological system.The risk assessment of a landfill should take place well in advance before it is in operation and this analysis would identify the various problem which may crop up and predict or design ways how to mitigate risk and find appropriate control measure. Nevertheless, the ecological risk assessment and the engineering risk assessment must be unite under one main component which is the environmental risk assessment.Developing the risk assessment we should know-What are types of waste we are dealing are they harmful?We must know who are exposed to those hazards(people, animals, aquatic life etc)(3)To what extent it is affecting environment (magnitude, frequency)?(4)Is there the need to provide corrective measures?Risk assessment involvement in the landfill would be a continuous process and it shall be carried out even after its closure. So, this evaluation exercise predicts and illustrates preventive measures for the environment. (TE Butt, 2008)3 METHODOLOGYHEALTH AND SAFETY TOUR AT MARE CHICOSE SANITARY LANDFILL3.1 OBJECTIVEA site visit was organized on 29/09/10 at Mare Chicose sanitary landfill. The purpose of the visit was to see the geographical location of the landfill, understand the management operations, vehicular movement control, and plant installations requirements and identify the hazards with evaluation of the risks present in the landfill. A checklist was formerly prepared prior to the visit on the hazards. Most of the work was adopted from Hobart City Council/Environmental aspects register (3)3.2 OBSERVATIONSThe Mare Chicose sanitary landfill is the only engineered landfill of Mauritius and it covers an area of about 32 hectares of land. It is operational since November 2007 and is managed by sotravic ltee. The sanitary landfill has been constructed with a designed capacity of about 20,000 tons of solid waste. It was plan during design stage to receive about 300 tons of waste daily but actually receive 1200 ton per day. The five cells of the landfill as at to date are full. The construction of a 6th cell is under construction to respond to the increasing demand of waste disposal which include municipal waste, textile waste , tyres and papers.At the construction phase, precautionary measures have been taken not to contaminate underground water table. The bed is protected by a layer of high density polyethylene impermeable membrane followed by 400g/m2 three layers of non woven geotextile. Above it follows a thick layer of aggregates of size 32mm which is finally covered by another layer of 1.5mm geotextile. In between are located leachate pipes whose functions are to collect the liquid leachate to a leachate pond. In the design of the main pipes for leachate, the yearly rainfall factor has been considered so that the accumulated rainfall on the bed is properly disposed off. Management of leachate is very important to ensure that there is no run out in drains and neighboring fields and cause environmental concern. Leachate also produce odour which is reduced with use of synthetic cover made of biodegradable plastic on top of the solid waste.(3) source http//www.risk assessement landfillThe depth of the l andfill is usually 4m. However the solid wastes are piled up to a height of 25 to 50m above ground level and are protected again on top with another layers of geotextile membranes, aggregates, sub soil and top soil which prevents infiltration of rain water in the disposed waste. Most of the disposed wastes in the landfill are organic and the settlement of the waste in the present cells will be about 6 metre over 15 years.It should be noted that methane gas is produced in dangerous concentration at bottom as a by-product during decomposition of the waste in anaerobic condition. This gas has a green house effect and is managed through a flaring system the gas is captured by aspiration from bottom of the landfill through a 460mm diameter slotted pipe to prevent its direct migration into the air. Methane is collected in a gas flare plant which has a capacity of 1500 m3 of gas per hour. It receives the gas through gas well put up which are located on top of the capping. One gas well ch ambers cover a radius of 40m of the capped landfill. The captured methane gas is either used to produce electricity or is released into the atmosphere as carbon dioxide after the flaring process.The following analysis is done on monthly basis to prevent environmental problem ,Leachate, Surface water for storm water monitoring, Underground water table and boreholes, air monitoring through gas analyser for CH4, CO2, and O2 (every three month), noise ,dust.The following health and safety measures have been taken at the landfillThe 50 workers posted are vaccinated against Tetanus and Hepatitis at intervals of six months.Regular health surveillance/medical checkup by a medical practitioner. prophylactic equipment provided Earmuff, rubber boot, respiratory mask and eye goggle.All loaders/compacters in use are air conditioned and the machines are designed such that there is no risk of overturning.The landfill is a restricted area and access is authorized only with permission from Ministry of Local Government.All staff are trained in fire safety and first aidNo work normally done inside waste- breathing apparatus is used if required.No radioactive waste, acids and medical waste are accepted. All liquid waste are directed to St Martin.All electronic waste are disposed off in separate concrete basin known as encapsulation.All asbestos are received only in sealed bags and disposed off deep in trenches and properly backfilled.A risk assessment was carried out during the health and safety tour at the sanitary landfill. The hazards identified have been evaluated in terms of its likelihood that a problem may occur and the damage it might cause. The consequences or potential severity of injury or damage, measured on a scale has also been assessed and a risk score given by multiplying the likelihood scale with the severity scale.The risk assessment carried out is quantitative and has been adapted from the five steps to risk assessment from the Health and Safety Executive. The steps are as followsSTEP ONE- Identifying the hazardsSTEP TWO Determine the risk or decide who might be harmed.STEP THREE Evaluate if the risk is tolerable.STEP FOUR Record the findings and prepare risk control plan.STEP FIVE Review the assessment if there is change in any work procedure/equipment.3.3 RISK ASSESSMENT AT MARE CHICOSEFor the purpose of this project, the following definition has been consideredHAZARDHazard is define as a source of inherent potential to cause harm or damage or injury.RISKRisk is defined as the likelihood/probability of the harm or damage or injury occurring.The risk assessment was carried out to evaluate the environmental and occupational hazards present on the landfill to determine the level of action required to reduce the risks to an acceptable level. When evaluating the risks imposed by the hazard, we have considered both the likelihood and severity of the event run acrossing.LIKELIHOODThis is defined as the chance of an event actually occurri ng. When making an assessment of likelihood, we established which of the following categories most closely describes the likelihood of the hazardous event occurringVery Likely Could happen frequentlyLikely Could happen occasionallyUnlikely Could happen, but only rarelyVery Unlikely Could happen but probably never willSEVERITYSeverity is defined as a measure of the supported consequence should an accident occur. When assessing the consequences of an accident, the most severe category one could reasonably expect to result from that accident has been selected. The severity is categorized as follows Major injuries irreversible injury and DeathModerate injuries a serious injury or damage to health requiring extended time off work to effect best recovery.Minor injuries a reversible injury or damage to health needing several days away from work to recover. Recovery would be full and permanent.In large Injuries-require first aid only and may need the remainder of the work consequen ce or shift off before being able to return to work. Requires no action to control.When making the risk assessment, all aspects of likelihood and severity has been taken into consideration. The interrelated parameters of likelihood and severity has been defined as risk score and any score of 9 and above is rated as unacceptable or of significant risk requiring immediate action with implementation of important control measures.CONTROL MEASURESControl measures are defined as corrective measures already in place to reduce the risk at an acceptable level. Consideration shall also be taken that these control measures are either engineering or administrative. However, some other control measures do exists but it all depends on the financial position of the organization and also to what extent are the control measures appropriate for the hazard present. These control measure are adopted in order to either eliminate completely the hazard or to mitigate the hazards.Implemented by whom and wh enThe health and safety officer shall propose to management the measure to be taken and who responsible to implement the control measure. Also, depending on the urgency and the degree of risk that the environment is exposed to, a time frame shall be established. Thus, in any work which has been delegated by the management to the department concern, the latter shall be responsible and also responsible in time limit proposed.VISIT TO MARE CHICOSE SANITARY LANDFILL SITE(Risk Assessment carried out on 29/09/10)LIKELIHOOD 1=Very tall(a) 2=unlikely 3=likely 4=very likely.SEVERITY 1=Insigni