Solid Waste Management

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Abstract
Solid waste management is one among the basic essential services provided by municipal authorities in the country to keep urban centers clean. However, it is among the most poorly rendered services in the basket. The systems applied are unscientific, outdated and inefficient ; population coverage is low ; and the poor are marginalized. Waste is littered all over leading to insanitary living conditions. Municipal laws governing the urban local bodies do not have adequate provisions to deal effectively with the ever- growing problem of solid waste management. With rapid urbanization, the situation is becoming critical. The urban population has grown fivefold in the last six decades with 285.35 million people living in urban areas as per the 2001 Census.

INTRODUCTION

The improper disposal of municipal waste has a serious and dangerous impact on a wide range of areas. Garbage thrown in the street or in open spaces creates a public health hazard, while waste dumped near rivers, lakes and streams contaminates the water supply. Rubbish that is burned in the open rather than disposed of properly creates pollution and releases toxic fumes into the environment. Non- biodegradable materials thrown into open drains make their way into the sewerage system, clogging pipelines and damaging infrastructure. The hazards posed by the dumping of untreated hospital and industrial waste are even greater, with the release of pathogens and toxic compounds posing a grave threat not just to human life but also to plants and animals. Garbage dumped in the countryside is not simply an eyesore; entire landscapes are ruined and unique habitats for flora and fauna are lost. All of these problems are common in India, where vast quantities of solid waste remain uncollected in the streets, along major roads, in empty plots of land, down hill slopes and in illegal dumps.

NATURE OF SOLID WASTE

Per capita waste generation ranges between 0.2 kg and 0.6 kg per day in the Indian cities amounting to about 1.15 lakh MT of waste per day and 42 million MT annually. Also, as the city expands, average per capita waste generation increases. Waste Generation per Capita in Indian cities The waste generation rates in India are lower than the low-income countries in other parts of the world and much lower compared to developed countries. However, lifestyle changes, especially in the larger cities, are leading to the use of more packaging material and per capita waste generation is increasing by about 1.3 per cent per year. With the urban population growing at 2.7 per cent to 3.5 per cent per annum, the yearly increase in the overall quantity of solid waste in the cities will be more than 5 percent. The Energy and Resources Institute (TERI) has estimated that waste generation will exceed 260 million tonnes per year by 2047—more than five times the present level. Cities with 100,000 plus population contribute 72.5 per cent of the waste generated in the country as compared to other 3955 urban centers that produce only 17.5 per cent of the total waste and practices continue to be outdated and inefficient. No serious efforts are made to adapt latest methods and technologies of waste management, treatment and disposal. Though a large portion of the municipal budget is allotted for solid waste management, most of it is spent on the wages of sanitation workers whose productivity is very low. There are no clear plans to enhance their efficiency or improve working conditions through the provision of modern equipment and protective gear. Unionization of the workers, politicization of labour unions and the consequent indiscipline among the workforce are all results of bad working conditions and inept handling of labour issues.
METHODS FOR PROCESSING, TREATMENT AND DISPOSAL OF SOLID WASTE

The main technological options available for processing/treatment and disposal of MSW are composting, vermicomposting, anaerobic digestion/ biomethanation, incineration, gasification and pyrolysis, plasma pyrolysis, production of Refuse Derived Fuel (RDF), also known as pelletization and sanitary landfilling/landfill gas recovery. Not all technologies are equally good. Each one of them has advantages and limitations.

 

COMPOSTING :- Composting is a technology known in India since times immemorial. Composting is the decomposition of organic matter by microorganism in warm, moist, aerobic and anaerobic environment. Farmers have been using compost made out of cow dung and other agro-waste. The compost made out of urban heterogeneous waste is found to be of higher nutrient value as compared to the compost made out of cow dung and agro-waste. Composting of MSW is, therefore, the most simple and cost effective technology for treating the organic fraction of MSW. Full-scale commercially viable composting technology is already demonstrated in India and is in use in several cities and towns. Its application to farm land, tea gardens, fruit orchards or its use as soil conditioner in parks, gardens, agricultural lands, etc., is however, limited on account of poor marketing.

Main advantages of composting include improvement in soil texture and augmenting of micronutrient deficiencies. It also increases moisture-holding capacity of the soil and helps in maintaining soil health. Moreover, it is an age-old established concept for recycling nutrients to the soil. It is simple and straightforward to adopt, for source separated MSW. It does not require large capital investment, compared to other waste treatment options. The technology is scale neutral. Composting is suitable for organic biodegradable fraction of MSW, yard (or garden) waste/waste containing high proportion of lignocelluloses materials, which do not readily degrade under anaerobic conditions, waste from slaughterhouse and dairy waste.

This method, however, is not very suitable for wastes that may be too wet and during heavy rains open compost plants have to be stopped. Land required for open compost plants is relatively large. Also, issues of methane emission, odour, and flies from badly managed open properly carried out there is possibility of toxic material entering the stream of MSW.

VERMI-COMPOSTING :- Vermi-compost is the natural organic manure produced from the excreta of earthworms fed on scientifically semi-decomposed organic waste. A few vermi composting plants generally of small size have been set up in some cities and towns in India, the largest plant being in Bangalore of about 100 MT/day capacity. Normally, vermi-composting is preferred to microbial composting in small towns as it requires less mechanization and it is easy to operate. It is, however, to be ensured that toxic material does not enter the chain which if present could kill the earthworms.

ANAEROBIC DIGESTION AND BIOMETHANATION :- Biomethanation is a comparatively well-established technology for disinfections, deodorization and stabilization of sewage sludge, farmyard manures, animal slurries, and industrial sludge. Its application to the organic fraction of MSW is more recent and less extensive. It leads to bio-gas/power generation in addition to production of compost (residual sludge).

This method provides a value addition to the aerobic (composting) process and also offers certain other clear advantages over composting in terms of energy. This method is suitable for kitchen wastes and, other putrescible wastes, which may be too wet and lacking in structure for aerobic composting. It is a net energy-producing process (100–150 kWh per tonne of waste input). A totally enclosed system enables all the gas produced to be collected for use.

A modular construction of plant and closed treatment needs less land area. This plant is free from bad odour, rodent and fly menace, visible pollution, and social resistance. It has potential for co-disposal with other organic waste streams from agro-based industry. The plant can be scaled up depending on the availability of the waste.

INCINERATION :- This method, commonly used in developed countries is most suitable for high calorific value waste with a large component of paper, plastic, packaging material, pathological wastes, etc. It can reduce waste volumes by over 90 per cent and convert waste to innocuous material, with energy recovery. The method is relatively hygienic, noiseless, and odourless, and land requirements are minimal. The plant can be located within city limits, reducing the cost of waste transportation.

This method, however, is least suitable for disposal of chlorinated waste and aqueous/high moisture content/low calorific value waste as supplementary fuel may be needed to sustain combustion, adversely affecting net energy recovery. The plant requires large capital and entails substantial operation and maintenance costs. Skilled personnel are required for plant operation and maintenance. Emission of particulates, SOx , NOx, chlorinated compounds in air and toxic metals in particulates concentrated in the ash have raised concerns.

PELLETIZATION :- It is basically a processing method for mixed MSW, which can be very effective in preparing an enriched fuel feed for thermal processes like incineration or industrial furnaces.

The RDF pellets can be conveniently stored and transported long distances and can be used as a coal substitute at a lower price. As pelletization involves significant MSW sorting operations, it provides a greater opportunity to remove environmentally harmful materials from the incoming waste prior to combustion.

The process, however, is energy intensive and not suitable for wet MSW during rainy season. If RDF fluff/pellets are contaminated by toxic/hazardous material, the pellets are not safe for burning in the open or for domestic use.

SANITARY LANDFILLS AND LANDFILL GAS RECOVERY :- Sanitary landfills are the ultimate means of disposal of all types of residual, residential, commercial and institutional waste as well as unutilized municipal solid waste from waste processing facilities and other types of inorganic waste and inerts that cannot be reused or recycled in the foreseeable future.

Its main advantage is that it is the least cost option for waste disposal and has the potential for the recovery of landfill gas as a source of energy, with net environmental gains if organic wastes are landfilled. The gas after necessary cleaning, can be utilized for power generation or as domestic fuel for direct thermal applications1 . Highly skilled persMajor limitation of this method is the costly transportation of MSW to far away landfill sites. Down gradient surface water can be polluted by surface run-off in the absence of proper drainage systems and groundwater aquifers may get contaminated by polluted leacheate in the absence of a proper leacheate collection and treatment system

DRAWBACKS IN PRESENT SOLID WASTE MANGEMENT SERVICES

1. No Storage of Waste at Source :- There is no practice of storing the waste at source in a scientifically segregated way. Citizens have not been educated to keep domestic, trade, and institutional bins for storage of waste at source and stop littering on the streets.

2. No System of Primary Collection from the Doorstep :- There is no public system of primary collection from the source of waste generation. The waste discharged here and there is later collected by municipal sanitation workers through street sweeping, drain cleaning, etc. Street sweeping has, thus become the principal method of primary collection.onnel are not required to operate a sanitary landfill.

3. Irregular Street Sweeping :- Even street sweeping is not carried out on a day-to-day basis in most cities and towns in India. Generally commercial roads and important streets are prioritized and rest of the streets are swept occasionally or not swept at all. Generally, no sweeping is done on Sundays and public holidays and a back log is created on the next working day.

The tools used for street sweeping are generally inefficient and out - dated. For instance, the broom with a short handle is still in use forcing sweepers to bend for hours resulting in fatigue and loss of productivity.

Traditional handcarts/tricycles are used for collection, which do not synchronize with the secondary storage systems. Waste is deposited on the ground necessitating multiple handling.

There are no uniform yardsticks adopted for street sweeping. Though, some states/cities have prescribed work-norms, these are not very scientific. Most of the cities allocate work to sanitation workers on ad hoc basis. The work distribution ranges between 200 metres to 1000 metres of street sweeping each day. Some sanitation workers are found under worked while some over burdened.

4. Waste Storage Depots :- As waste is collected through traditional handcarts/tricycles that can carry only a small quantity of waste at a time, there is a practice to set up depots for temporary storage of waste to facilitate transportation through motorized vehicles. Generally, open sites or round cement concrete bins, masonry bins or concrete structures are used for temporary bulk storage, which necessitates multiple handling of waste. Waste often spills over which is both unsightly as well as unhygienic.

5. Transportation of Waste :- Transportation of waste from the waste storage depots to the disposal site is done through a variety of vehicles such as bullock carts, three-wheelers, tractors, and trucks. A few cities use modern hydraulic vehicles as well. Most of the transport vehicles are old and open. They are usually loaded manually. The fleet is generally inadequate and utilization in optimal. Inefficient workshop facilities do not do much to support this old and rumbling squad of squalid vehicles. The traditional transportation system does not synchronize with the system of primary collection and secondary waste storage facilities and multiple manual handling of waste results.

6. Processing of Waste :- Generally no processing of municipal solid waste is done in the country. Only a few cities have been practising decentralized or centralized composting on a limited scale using aerobic or anaerobic systems of composting. In some towns un- segregated waste is put into the pits and allowed to decay for more than six months and the semi-decomposed material is sold out as compost. In some large cities aerobic compost plants of 100 MT to 700 MT capacities are set up but they are functioning much below installed capacity. A few towns are practising vermi-composting on a limited scale.

7. Disposal of Waste :- Disposal of waste is the most neglected area of SWM services and the current practices are grossly unscientific. Almost all municipal authorities deposit solid waste at a dump-yard situated within or outside the city haphazardly and do not bother to spread and cover the waste with inert material. These sites emanate foul smell and become breeding grounds for flies, rodent, and pests. Liquid seeping through the rotting organic waste called leachate pollutes underground water and poses a serious threat to health and environment.

Landfill sites also release landfill gas with 50 to 60 per cent methane by volume. Methane is 21 times more potent than carbon dioxide aggravating problems related to global warming. It is estimated by TERI that in 1997 India released about 7 million tonnes of methane into the atmosphere. This could increase to 39 million tonnes by 2047 if no efforts are made to reduce the emission through composting, recycling, etc.

CASE STUDY: INTIATIVE TAKEN BY STATE GOVERNMENTS TO HANDLE SOLID WASTE

Karnataka :- Karnataka formulated the state policy for implementation of Integrated Solid Waste Management (ISWM) based on MSW Rules 2000 laying down guidelines for all the activities under MSWM, defining roles and responsibilities of all the stakeholders namely, ULBs, elected representatives, waste generators, NGOs, CBOs, SHGs, etc. It created the post of Environmental Engineers in 123 local bodies to build technical capability. SWM Action Plan and Management Plans for 56 cities were prepared based on data pertaining to concerned ULBs.

The state also prepared technical manuals on (a) design and specifications of the tools and equipment for SWM and (b) treatment and landfill operations. To promote SWM practices at the local level it prepared a short film and issued six short books on MSWM for educating stakeholders. A series of workshops was conducted for the local body officials, elected representatives, NGOs, etc., for preparation of action plan, adoption of state policy, identification of best practices, carrying out of Information, Education and Communication (IEC) activities and identifying suitable landfill sites for treatment and disposal of waste.

The state has issued orders for transfer of government land free of cost to the 226 local bodies for sanitary landfills, issued guidelines for identification and purchase of private land for this purpose and, if required, provides 100 per cent financial assistance to purchase the identified land from a budget allocation of Rs 16.1 crore. The government initiated action to develop scientific landfill sites in eight class 1 cities on BOT basis.

Gujarat :- Government of Gujarat has set up a state level committee headed by the Principal Secretary, Urban Development and Urban Housing Department and a sub-committee headed by a subject expert to identify systems for solid waste management. All cities and towns have been advised to implement the recommended systems. Regional and state level workshops have been conducted to provide training to all responsible officers of ULBs and action plans have been prepared for almost all the cities through the Gujarat Municipal Finance Board, a nodal agency of the state government and City Manager’s Association, Gujarat. The state government has given Rs 22 crore since 2000 to ULBs of class I cities/towns for the procurement of tools and equipment.

Government of Gujarat has passed a resolution to allot land to municipal corporations at 25 per cent of the market value and to smaller local bodies on a token lease rent for a period of 30 years for treatment and disposal of waste. Thus, 147 out of 149 cities and towns have been able to earmark appropriate land and these sites have been duly authorized by the state pollution control board for treatment and disposal of waste.

The year 2005 has been declared the Year for Urban Development. Under this initiative, construction of treatment and disposal sites in all the 141 municipalities, has been taken up centrally using expert agencies, state government funds and central government grants. For this purpose, the state government has formed a core committee of administrative and technical experts and identified the Gujarat Urban Development Company as a nodal agency to facilitate the construction of treatment and disposal sites through qualified contractors. The work is proposed to be taken up simultaneously in four regions of the Gujarat state.

Besides bearing the full cost of construction of treatment and disposal facilities, using 12th Finance Commission grant and Urban Renewal Mission fund the state government now proposes to give financial support ranging between 50 and 90 per cent to municipalities for tools and equipment for collection, secondary storage, and waste transportation facilities. The entire venture is expected to cost the government of Gujarat Rs 346 crore. The 141 urban local bodies in the state (other than the corporations) have been grouped in four to six categories and cost estimates have been prepared for the construction of landfill sites and compost plants of standard designs for different levels of cities/towns .

West Bengal :- The Government of West Bengal has launched a ‘West Bengal Solid Waste Management Mission’ registered under the West Bengal Societies Registration Act 1961 on 18 May 2005. The mission has been set up under the chairmanship of the Chief Secretary to Government and a technical committee headed by the Secretary, Department of Environment. Regulations have been framed and the powers, duties and functions of the mission as well as technical advisory committee have been laid down. The objective of the mission is to promote modernization of collection and transportation of MSW and facilitate development of cost-effective technology for treatment and disposal of the same in the state. Provision of technical and financial support to municipal bodies, PRIs, and authorities of the statutory area for setting up of regional or common solid waste management facilities is proposed.

The technical committee has prepared an action plan for implementing MSW Rules 2000 in the state. It has been envisaged that 25 to 30 regional facilities would be constructed in the state to cover 126 ULBs including six corporations. One regional facility would serve about five ULBs and each city would share the O&M cost in proportion to the waste delivered for treatment and disposal.

The state government’s technical committee has prepared a tentative estimate of over Rs 395 crore for supporting municipal authorities in the state if they agree to enter into a cost sharing arrangement of a little over Rs 15 crore (cost estimates in Table 8.7). Upgrading SWM services would include provisions for public awareness, capacity building of the municipal authorities, procurement of tools, equipment, and vehicles for primary collection, secondary storage and transportation of waste, construction of transfer stations, procurement of large hauling vehicles for transportation, construction of regional as well as individual compost plants and construction of about 25 regional landfill facilities covering the entire state. The state government proposes to use the funds allocated by the 12th Finance Commission as well as from the urban renewal fund for this purpose.

The government of India has allocated Rs 393 crore to the municipalities in the state out of which 50 per cent is earmarked for solid waste management in urban areas. Besides another Rs 1271 crore have been allotted to panchayats out of which the state expects to spend at least 10 per cent on solid waste management making a total Rs 323.60 crore. Some additional funds would be found from the urban renewal grant to be allocated by the government of India and internal resources of the state as well as local bodies.

FUNDS REQUIRED AND SOURCES OF FUNDS FOR SOLID WASTE MANGEMENT
Operational Expenditure :- SWM constitutes up to 10 to 50 per cent of municipal budget expenditure depending on the income sources of the municipal authorities. The main expenditure heads under SWM are in salaries and allowances, consumables, vehicles repair and maintenance, contingencies and others. A recent survey by the National Institute of Urban Affairs shows ‘salaries of sanitation workers’ for SWM in class I cities, constitute as much as 75 per cent of total SWM expenditure. This is still higher at 85 per cent in class II cities.

Capital Investments :- Capital costs for SWM in India are met from the current revenue and borrowings. City level planning with related budget estimates, is usually absent in most local bodies. Cities borrow funds from financial institutions such as HUDCO and banks for financing equipment and vehicles to the extent their financial health permits.

SOURCES OF FUNDS

Conservancy Tax :- Traditionally, funding for solid waste systems comes from the general fund. Most ULBs use a percentage of the property tax to support the solid waste management system. This tax, known as conservancy tax, is easy to administer since no separate billing or collection system is needed. However, the disadvantage is that in most Indian cities’ assessment and collection of property tax is poor and this poor base provides for very little income.

User Charges :- Increased public awareness of solid waste issues and public involvement in the decision-making process may provide the opportunity to adjust user charges to reflect real costs of providing solid waste services. User charges if properly administered: • are an equitable means of funding SWM services;


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