Product development
Ensuring sustainable management of municipal solid waste
Published
5 years agoon
By
adminWith rapid urbanisation taking place in our country, tackling of municipal solid waste especially in the metro cities has reached a dead end when land fill areas are no more available. The world over situation is no different, yet the problem gets solved, explains Ulhas Parlikar.
Current level of municipal solid waste (MSW) generation in the country is about 70 million TPA. The sustainable management of MSW demands that each constituent present in it is gainfully utilised and same is achievable by having proper segregation processes. This workable approach provides landfill free towns is depicted in Fig 1.
Towns of Madukkarai in Tamil Nadu, Vengurla in Maharastra, Ambukapur in Chattisgarh, etc. are the demonstrated examples of this concept of sustainable management of MSW in which each fraction of the segregated fraction of MSW gets gainfully utilised and there is no dump yard or landfill in the process in these towns. The SWM Rules, 2016 have included following provisions to achieve the desired level of segregation.
Segregation of dry, wet and domestic hazardous waste at source
Door-to-door collection
Setting up Material Recovery Facility (MRF) facilities to achieve following:
- Segregation of compostable material for sending it to composting facility or converting it into biogas
- Segregation of recyclables such as metals, plastics and glass for sending it to recycling facilities
- Segregation of inert materials to send it for filling in low lying areas/embankments etc.
Segregating the non-recyclable combustiblematerial called segregated combustible fraction (SCF) and sending it for use in following applications:
- Co-processing in cement kilns as alternative fuel and raw material or
- replacement of fossil fuel used by power plants or other applications within utilise
- fossil fuel in their operations or
- sending it to waste-to-energy (WTE) plant for generating electricity.
The municipal corporations of different towns and cities are moving towards implementing the above provisions in the rules appropriately. The management of compostable, recyclables and inert materials is pretty easy and has no difficulty in implementing.
In the sustainable management approach defined in Fig 1 the real challenge is with the management of SCF. This SCF is a mix of multi-layer Packaging (MLP) material, thin and single use plastics, rexin pieces, tyre and tube pieces, rubber pieces, thermocol, old or damaged shoes, chappals, old and torn clothes, contaminated paper, etc. As there are no takers for this material in the market market place, the same needs to be used for electricity generation in WTE plant or needs to be sent to cement kiln or power plant for co-processing.
Options of WTE and power plants
The option of waste to energy for this SCF fraction is difficult to implement in most of the towns and cities because the minimum implementable size of the WTE plant is 300 TPD and the cost of such a WTE plant is about Rs 100 crore. To generate 300 TPD of SCF, the population of the town has to be more than 50 lakh, SCF content in MSW should be around 15 per cent and the MSW generation rate should be 0.4 kg/capita/day. Barring a few metro cities, none of the towns and cities can meet these criteria. Therefore, the option of waste to energy is difficult to implement unless the SCF is pooled up from different adjacently located towns.
The utilisation of SCF in the power plant is not yet getting implemented and has concerns due to presence of >0.5 per cent chlorine in it. These concerns are on account of the likelihood of dioxins/furans and hydrogen chloride in the stack gases. There is need therefore to have some co-processing trials carried out in some of the power plants in the country to work out an appropriate protocol.
Capability of cement industry
The best option therefore is cement kiln co-processing and is substantially workable on account of following features.
- The cement plant is already existing.
- Most of the cement plants have co-processing facility already set up on their kiln system.
Hence most of such cement plants are ready to utilise the refused derived fuel (RDF) meeting their acceptability criteria. From the 70 million TPA of MSW, appropriately 10 million TPA of SCF can get generated. This can be suitably converted into cement grade RDF and can be sustainably utilised in the cement kiln as alternative fuel and raw material through co-processing.
The current clinker production is at a level of about 250 million TPA, the TSR achievable by the industry with this RDF would range in between 12 to 15 per cent, which is easily feasible without getting into concerns of chlorine saturation.
Acceptable RDF grade to cement industry
The expert committee constituted by the Ministry of Housing and Urban Affairs (MoHUA) has proposed three grades of RDF for use in cement industry. Grade – I and Grade – II can be utilised by cement industry as such and Grade – III can be utilised by it after blending it with some other AFR materials. These RDF grades can be manufactured from the non-recyclable segregated combustible fraction (SCF) that gets generated from MSW.
The manufacture of these RDF grades can be done after setting up the required facility. These include facilities for quality assessment, blending, shredding, bailing, storage, etc. It is desired that RDF producers interact with cement plants to produce the material having desired quality and enter into a suitable long term techno-commercial agreement with them. This facility can be set up near the SCF generation site or at the cement plant. It can be set up and operated by a third party waste processor or also by the cement plant as depicted in Fig 2.
Win-win considerations in the sustainable management of SCF For having ensuring a successful business model, it is important to have a win-win consideration in case of each of the stakeholder. There are three stakeholders in the process. They are municipal corporation, waste processor and cement plant. Fig 3 provides the cost and benefits associate with each of these stakeholders.
Following win-win considerations should be noted from Fig 3:
- Cement plant: The price of RDF should be reasonably lower than the cost of coal after accounting for higher fuel consumption and production loss.
- Waste processor: Sum of the (i) tipping fee earned from municipal corporation and (ii) RDF price received from cement plant should be reasonably more than sum of (i) processing cost of converting SCF to RDF, (ii) transportation cost of SCF from Municipal Corporation to its facility and (iii) transportation cost of RDF from its facility to cement plant.
- Municipal corporation: The SCF should get sustainably managed without the need to build dump yard or land fill for the same. Further, the proportionate portion of the taxes collected by it for management of MSW should be more than or equal to the tipping fee paid to the waste processor for the sustainable management of SCF.
Challenges and feasible solutions
-
A justifiable consideration of the administration towards this solution. Currently, the major consideration of the administration is revolving around the WTE solution which is unlikely to get implemented due to the techno-commercial constraints mentioned above. The co-processing solution is more attractive from both technical and commercial considerations.
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Cost involved in setting up RDF processing facilities and extending some of the relevant fiscal policies towards this solution. The central government and state governments extend grants in setting up the projects for management of MSW. It is desired that these grants should also get extended to setting up the facilities for production of cement grade RDF.
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Cost of transportation of SCF from Municipal Corporation to waste processor and cost of RDF from the waste processor to cement plant. Considering that the overall SCF generation in the country will be about 10 Million TPA and average transportation cost of transporting SCF from municipal corporation to SCF processing facility is Rs 400/t, the overall cost of transportation works out to Rs 400 crore per year. Considering that RDF produced from SCF will be 7 million TPA and the average cost of transportation of RDF from processing facility to cement plant is Rs 1,500 per tonne, the total transportation cost works out to Rs 1,050 crore. Hence, put together the amount works out to Rs 1,450 crore.
-
This figure of Rs. 1450 Crores per year is for the management of the entire non-recyclable combustible fraction getting generated in the country and avoids dump yards and landfill implementation country-wide.
Recommendations
It is suggested therefore that following actions be taken up by the Government to solve this huge problem of SCF waste management and dump yard creation faced in the country.
-
Formulate a RDF mission to directly coordinate the required actions through municipal corporations, MSW management companies, RDF manufacturing companies and cement plants.
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Extend the existing fiscal benefits of MSW projects to RDF production projects also.
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Encourage use of RDF in cement kilns through feasible fiscal policies.
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Encourage setting up of RDF facilities across the towns and cities of the country by including them in the tendering process.
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Establish mechanism to deal with the transportation cost management of SCF and RDF as elaborated above through an appropriate central and state level budgeting process.
Conclusion
The current status of RDF usage is same as that of fly ash usage in the cement manufacture in the 90s. The cement industry has grown mature over past decades and is utilising now about 50 million TPA of fly ash. This is because of the win-win policy that the fly ash mission had promoted during the initial days. It is clear from the fly ash example that if RDF is seen as an accessible and acceptable material from the techno-commercial angle, the entire cement industry would implement the required facilities at its plant and would undertake co-processing of RDF to its maximum levels.
This RDF use in cement plant will facilitate following.
- Reduction in land filling/dump yard space
- Reduced GHG emissions
- Eliminating the dump yards and associated environmental issues and
- Conservation of reasonable quantum of fossil resources such as coal, limestone, iron ore, bauxite and silica that are being utilised currently in the cement manufacture.
ABOUT THE AUTHOR:
The article is authored by Ulhas Parlikar. He can be contacted at: Mob: +91 99675 81975 or Email: ulhas@parlikar.com
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Marketing strategies of cement companies have undergone gradual transformation owing to the change in consumer behaviour. While TV commercials are high on humour and emotions to establish a fast connect with the customer, social media campaigns are focussed more on capturing the consumer’s attention in an over-crowded virtual world. Branding for cement companies has become a holistic growth strategy with quantifiable results. This has made brands opt for a mix package of traditional and new-age tools, such as social media. However, the hero of every marketing communication is the message, which encapsulates the unique selling points of the product. That after all is crux of the matter here.
While cement companies are effectively using marketing tools to reach out to the consumers, they need to strengthen the four Cs of the branding process – Consumer, Cost, Communication and Convenience. Putting up the right message, at the right time and at the right place for the right kind of customer demographic is of utmost importance in the long run. It is precisely for this reason that regional players are likely to have an upper hand as they rely on local language and cultural references to drive home the point. But modern marketing and branding domain is exponentially growing and it would be an interesting exercise to tabulate and analyse its impact on branding for cement.
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Indian cement industry is well known for its energy and natural resource efficiency
Published
2 years agoon
November 18, 2022By
adminDr Hitesh Sukhwal, Deputy General Manager – Environment, Udaipur Cement Works Limited (UCWL) takes us through the multifaceted efforts that the company has undertaken to keep emissions in check with the use of alternative sources of energy and carbon capture technology.
Tell us about the policies of your organisation for the betterment of the environment.
Caring for people is one of the core values of our JK Lakshmi Cement Limited. We strongly believe that we all together can make a difference. In all our units, we have taken measures to reduce carbon footprint, emissions and minimise the use of natural resources. Climate change and sustainable development are major global concerns. As a responsible corporate, we are committed with and doing consistent effort small or big to preserve and enrich the environment in and around our area of operations.
As far as environmental policies are concerned, we are committed to comply with all applicable laws, standards and regulations of regulatory bodies pertaining to the environment. We are consistently making efforts to integrate the environmental concerns into the mainstream of the operations. We are giving thrust upon natural resource conservation like limestone, gypsum, water and energy. We are utilising different kinds of alternative fuels and raw materials. Awareness among the employees and local people on environmental concerns is an integral part of our company. We are adopting best environmental practices aligned with sustainable development goals.
Udaipur Cement Works Limited is a subsidiary of the JK Lakshmi Cement Limited. Since its inception, the company is committed towards boosting sustainability through adopting the latest art of technology designs, resource efficient equipment and various in-house innovations. We are giving thrust upon renewable and clean energy sources for our cement manufacturing. Solar Power and Waste Heat Recovery based power are our key ingredients for total power mix.
What impact does cement production have on the environment? Elaborate the major areas affected.
The major environmental concern areas during cement production are air emissions through point and nonpoint sources due to plant operation and emissions from mining operation, from material transport, carbon emissions through process, transit, noise pollution, vibration during mining, natural resource depletion, loss of biodiversity and change in landscape.
India is the second largest cement producer in the world. The Indian cement industry is well known for its energy and natural resource efficiency worldwide. The Indian cement industry is a frontrunner for implementing significant technology measures to ensure a greener future.
The cement industry is an energy intensive and significant contributor to climate change. Cement production contributes greenhouse gases directly and indirectly into the atmosphere through calcination and use of fossil fuels in an energy form. The industry believes in a circular economy by utilising alternative fuels for making cement. Cement companies are focusing on major areas of energy efficiency by adoption of technology measures, clinker substitution by alternative raw material for cement making, alternative fuels and green and clean energy resources. These all efforts are being done towards environment protection and sustainable future.
Nowadays, almost all cement units have a dry manufacturing process for cement production, only a few exceptions where wet manufacturing processes are in operation. In the dry manufacturing process, water is used only for the purpose of machinery cooling, which is recirculated in a closed loop, thus, no polluted water is generated during the dry manufacturing process.
We should also accept the fact that modern life is impossible without cement. However, through state-of-the-art technology and innovations, it is possible to mitigate all kinds of pollution without harm to the environment and human beings.
Tell us about the impact blended cement creates on the environment and emission rate.
Our country started cement production in 1914. However, it was introduced in the year 1904 at a small scale, earlier. Initially, the manufacturing of cement was only for Ordinary Portland Cement (OPC). In the 1980s, the production of blended cement was introduced by replacing fly ash and blast furnace slag. The production of blended cement increased in the growth period and crossed the 50 per cent in the year 2004.
The manufacturing of blended cement results in substantial savings in the thermal and electrical energy consumption as well as saving of natural resources. The overall consumption of raw materials, fossil fuel such as coal, efficient burning and state-of-the-art technology in cement plants have resulted in the gradual reduction of emission of carbon dioxide (CO2). Later, the production of blended cement was increased in manifolds.
If we think about the growth of blended cement in the past few decades, we can understand how much quantity of , (fly ash and slag) consumed and saved natural resources like limestone and fossil fuel, which were anyhow disposed of and harmed the environment. This is the reason it is called green cement. Reduction in the clinker to cement ratio has the second highest emission reduction potential i.e., 37 per cent. The low carbon roadmap for cement industries can be achieved from blended cement. Portland Pozzolana Cement (PPC), Portland Slag Cement (PSC) and Composite Cement are already approved by the National Agency BIS.
As far as kilogram CO2 per ton of cement emission concerns, Portland Slag Cement (PSC) has a larger potential, other than PPC, Composite Cement etc. for carbon emission reduction. BIS approved 60 per cent slag and 35 per cent clinker in composition of PSC. Thus, clinker per centage is quite less in PSC composition compared to other blended cement. The manufacturing of blended cement directly reduces thermal and process emissions, which contribute high in overall emissions from the cement industry, and this cannot be addressed through adoption of energy efficiency measures.
In the coming times, the cement industry must relook for other blended cement options to achieve a low carbon emissions road map. In near future, availability of fly ash and slag in terms of quality and quantity will be reduced due to various government schemes for low carbon initiatives viz. enhance renewable energy sources, waste to energy plants etc.
Further, it is required to increase awareness among consumers, like individual home builders or large infrastructure projects, to adopt greener alternatives viz. PPC and PSC for more sustainable
resource utilisation.
What are the decarbonising efforts taken by your organisation?
India is the world’s second largest cement producer. Rapid growth of big infrastructure, low-cost housing (Pradhan Mantri Awas Yojna), smart cities project and urbanisation will create cement demand in future. Being an energy intensive industry, we are also focusing upon alternative and renewable energy sources for long-term sustainable business growth for cement production.
Presently, our focus is to improve efficiency of zero carbon electricity generation technology such as waste heat recovery power through process optimisation and by adopting technological innovations in WHR power systems. We are also increasing our capacity for WHR based power and solar power in the near future. Right now, we are sourcing about 50 per cent of our power requirement from clean and renewable energy sources i.e., zero carbon electricity generation technology. Usage of alternative fuel during co-processing in the cement manufacturing process is a viable and sustainable option. In our unit, we are utilising alternative raw material and fuel for reducing carbon emissions. We are also looking forward to green logistics for our product transport in nearby areas.
By reducing clinker – cement ratio, increasing production of PPC and PSC cement, utilisation of alternative raw materials like synthetic gypsum/chemical gypsum, Jarosite generated from other process industries, we can reduce carbon emissions from cement manufacturing process. Further, we are looking forward to generating onsite fossil free electricity generation facilities by increasing the capacity of WHR based power and ground mounted solar energy plants.
We can say energy is the prime requirement of the cement industry and renewable energy is one of the major sources, which provides an opportunity to make a clean, safe and infinite source of power which is affordable for the cement industry.
What are the current programmes run by your organisation for re-building the environment and reducing pollution?
We are working in different ways for environmental aspects. As I said, we strongly believe that we all together can make a difference. We focus on every environmental aspect directly / indirectly related to our operation and surroundings.
If we talk about air pollution in operation, every section of the operational unit is well equipped with state-of-the-art technology-based air pollution control equipment (BagHouse and ESP) to mitigate the dust pollution beyond the compliance standard. We use high class standard PTFE glass fibre filter bags in our bag houses. UCWL has installed the DeNOx system (SNCR) for abatement of NOx pollution within norms. The company has installed a 6 MW capacity Waste Heat Recovery based power plant that utilises waste heat of kiln i.e., green and clean energy source. Also, installed a 14.6 MW capacity solar power system in the form of a renewable energy source.
All material transfer points are equipped with a dust extraction system. Material is stored under a covered shed to avoid secondary fugitive dust emission sources. Finished product is stored in silos. Water spraying system are mounted with material handling point. Road vacuum sweeping machine deployed for housekeeping of paved area.
In mining, have deployed wet drill machine for drilling bore holes. Controlled blasting is carried out with optimum charge using Air Decking Technique with wooden spacers and non-electric detonator (NONEL) for control of noise, fly rock, vibration, and dust emission. No secondary blasting is being done. The boulders are broken by hydraulic rock breaker. Moreover, instead of road transport, we installed Overland Belt Conveying system for crushed limestone transport from mine lease area to cement plant. Thus omit an insignificant amount of greenhouse gas emissions due to material transport, which is otherwise emitted from combustion of fossil fuel in the transport system. All point emission sources (stacks) are well equipped with online continuous emission monitoring system (OCEMS) for measuring parameters like PM, SO2 and NOx for 24×7. OCEMS data are interfaced with SPCB and CPCB servers.
The company has done considerable work upon water conservation and certified at 2.76 times water positive. We installed a digital water flow metre for each abstraction point and digital ground water level recorder for measuring ground water level 24×7. All digital metres and level recorders are monitored by an in-house designed IoT based dashboard. Through this live dashboard, we can assess the impact of rainwater harvesting (RWH) and ground water monitoring.
All points of domestic sewage are well connected with Sewage Treatment Plant (STP) and treated water is being utilised in industrial cooling purposes, green belt development and in dust suppression. Effluent Treatment Plant (ETP) installed for mine’s workshop. Treated water is reused in washing activity. The unit maintains Zero Liquid Discharge (ZLD).
Our unit has done extensive plantations of native and pollution tolerant species in industrial premises and mine lease areas. Moreover, we are not confined to our industrial boundary for plantation. We organised seedling distribution camps in our surrounding areas. We involve our stakeholders, too, for our plantation drive. UCWL has also extended its services under Corporate Social Responsibility for betterment of the environment in its surrounding. We conduct awareness programs for employees and stakeholders. We have banned Single Use Plastic (SUP) in our premises. In our industrial township, we have implemented a solid waste management system for our all households, guest house and bachelor hostel. A complete process of segregated waste (dry and wet) door to door collection systems is well established.
Tell us about the efforts taken by your organisation to better the environment in and around the manufacturing unit.
UCWL has invested capital in various environmental management and protection projects like installed DeNOx (SNCR) system, strengthening green belt development in and out of industrial premises, installed high class pollution control equipment, ground-mounted solar power plant etc.
The company has taken up various energy conservation projects like, installed VFD to reduce power consumption, improve efficiency of WHR power generation by installing additional economiser tubes and AI-based process optimisation systems. Further, we are going to increase WHR power generation capacity under our upcoming expansion project. UCWL promotes rainwater harvesting for augmentation of the ground water resource. Various scientifically based WHR structures are installed in plant premises and mine lease areas. About 80 per cent of present water requirement is being fulfilled by harvested rainwater sourced from Mine’s Pit. We are also looking forward towards green transport (CNG/LNG based), which will drastically reduce carbon footprint.
We are proud to say that JK Lakshmi Cement Limited has a strong leadership and vision for developing an eco-conscious and sustainable role model of our cement business. The company was a pioneer among cement industries of India, which had installed the DeNOx (SNCR) system in its cement plant.
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