Environmental Engineer at Envo Projects,Delhi,India.www.envoprojects.com I am collecting Articles i found interesting here so that i can read them at my leisure later on.This blog is for my own self improvement.TO AVOID COPYRIGHT VIOLATIONS, ALL POSTS ARE SHOWN ALONG WITH SOURCES FROM WHERE ITS TAKEN.PLEASE CONTACT ME IF YOU ARE THE AUTHOR AND YOUR NAME IS NOT DISPLAYED IN THE ARTICLE. +918076071358(WHATSAPP)
Vermi Compost | |
| Vermi compost is a newly developed compost fertiliser which can be used largely instead of inorganic as well as organic fertiliser. Vermicomposting is most suited interms of a balance between cost and effectivity. The production of vermi-compost involves breeding of earth worms in a mixture of cowdung, soil and agriculture residue till the whole mass is converted into cast. This cast is then collected to give the vermicompost. With an eye to all benefits, increasing attention is being focused on breeding of earth worm (vermiculture) and their subsequent use in preparation of manure called vermi compost. There are few organised sectors and few state government as well as central government, some of private organisation also manufactured vermicompost. There is requirement of good advertisement and consciousness towards farmers to the good effect over the existing fertiliser to make popularity of the vermicompost. The demand will be double or tripple in near future. There is good scope for new entrepreneurs. | |
| Plant capacity: 5.0 MT/Day | Plant & machinery: Rs. 8.0 Lacs |
| Working capital: Rs. 9.2 Lacs | T.C.I: Rs. 54.3 Lacs |
| Return: 48.19% | Break even: 42.53% |
This chapter studies in details six ongoing waste management schemes/programmes/projects in India. While two of these projects concentrate on composting and recycling, four concentrate on waste-to-energy projects. The earlier study includes the Bangalore model and the Jaipur model. For waste-to-energy projects, facilities in Lucknow, Hyderabad, Vijaywada and Nagpur have been studied. The studies also highlights on the environmental and cost sustainability of these projects/programmes. Inputs from these studies have been used to develop pilot cases, along with their cost and financing options; these are outlined in the following chapter. In order to facilitate understanding of the technologies used in these eight cities, short write-ups on some of the technologies used/available have been outlined below. Merits and demerits of some of these technologies are also outlined to assist any policy maker in identifying the best alternate solution to waste disposal depending on local conditions.
Composting is defined as a controlled process involving microbial degradation of organic matter (MoEF, 1999). There are various types of composting, but they can be categorised into three major segments – aerobic composting, anaerobic composting and vermicomposting.
Anaerobic Composting
In this form of composting, the organic matter is decomposed in the absence of air. Organic matter may be collected in pits and covered with a thick layer of soil and left undisturbed for 6-8 months. The compost so formed may not be completely converted and may include aggregated masses (CEE, 2000).
Aerobic Composting
A process by which organic wastes are converted into compost or manure in presence of air, aerobic composting may be of different types. The most common is the Heap Method where organic matter needs to be divided into three different types and need to be placed in a heap one the other, covered by a thin layer of soil or dry leaves. This heap needs to be mixed every week and it takes about 3 weeks for conversion to take place.
In the Pit Method the same process as above in done, but in pits specially constructed/dug out for this purpose. Mixing has to be done every 15 days and there is no fixed time in which the compost may be ready (depends on soil moisture, climate, level of organic material, etc.). The Berkley Method uses a labour intensive technique and has precise requirements of the material to be composted. Easily biodegradable material, such as grass, vegetable matter, etc., are mixed with animal matter in the ratio of 2:1. This is piled and mixed at regular intervals. Compost is usually ready in 15 days (CEE, 2000).
Vermicomposting
Vermicomposting involves use of earthworms as natural and versatile bio-reactors for the process of conversion. Vermicomposting is done in specially designed pits where earthworm culture also need to be done. As compared to above, this is a much more precision-based option and requires overseeing of work by an expert. It is also a more expensive option (especially O&M costs are high). However, unlike the above two options, it is a completely odour less process making it a preferred solution in residential areas. It also has an extremely high rate of conversion and so quality of end product is very high with rich macro and micro nutrients. The end product also has the advantage that it can be dried and stored safely for longer period of time.
Incineration
Incineration is the process of controlled combustion at around 800oC for burning of wastes and residue, containing combustible material. The heat generated during this process can be recovered and utilised for production of steam and electricity. This method is usually used to achieve maximum volume reduction, especially where there is a shortage of landfill facilities. It is also usually a cost effective method o disposal (CPCB, 2000). However, in Indian conditions, it is not always very successful due to the low calorific value of Indian wastes (low combustible material). Also it is not classified by the MNES as an innovative practice and so looses out on many incentives otherwise provided by the MNES for WTE plants.
Pelletisation
This refers to creation of fuel pellets (also called refuse derived fuel or RDF) from MSW. Pelletisation generally involves segregation of incoming waste in to low and high calorific material followed by separate shredding. Different heaps of shredded wastes are mixed together in suitable proportions and solidified to produce RDF pellets. Pellets are small cylindrical pieces with a calorific value of 400Kcal/kg. Since this is quite close to calorific value of coal, it can be used as a substitute. However, calorific value of the pellets completely depend on the calorific value of the waste stream which needs to be sorted in Indian conditions to allow only the right type of waste to come through.
Pyrolysis/Gasification
In this process, combustible material is allowed to dry/dewater and is then subjected to shredding. These are then incinerated in oxygen deficient environment (pyrolysis). Gas produced from this process can be stored and used as combustible source when required. However, quality of the gas also depends largely on quality of waste stream and requires high calorific value waste inputs. Different types of pyrolysis/gasification systems are available which can be used depending on local conditions; some of these include Garrets Flash Pyrolysis process, ERCB process, Destrugas Gasification process, Plasma Arc process, Slurry Carb process, etc. Recent studies for Indian scenario clearly show that while net power generation for thermo-chemical conversion processes is around 14.4 times the quantity of waste input (in kW), the same for bio-chemical conversion process is 11.5 times the waste inputs (provided 50% of waste inputs are volatile solids). However, in terms of environmental impact, the later is far safer option than the previous.
Bio-Methanation
While bio-methanation is generally classified as a WTE process, unlike the previous three alternatives, which use thermo-chemical conversion, this uses bio-chemical conversion similar to composting process. It basically taps the methane gas generated from the bio-chemical reaction in wastes dumped in aerobic digesters.
Landfill Gas Recovery
Energy Recovery from Waste-to-Energy Plants
Recent studies for Indian scenario clearly show that while net power generation for thermo-chemical conversion processes is around 14.4 times the quantity of waste input (in kW), the same for bio-chemical conversion process is 11.5 times the waste inputs (provided 50% of waste inputs are volatile solids). However, in terms of environmental impact, the later is far safer option than the previous.
Similar in principal to the bio-methanation option, this process taps and stores gas produced in sanitary landfills. Typically, landfill gas production starts within a few months after disposal of wastes and generally lasts till 10 years or more depending on composition of waste and availability/distribution of moisture.
Table 4.1 and 4.2 highlight some of the advantages and disadvantages of various options discussed have been outlined in the following page.
Table 3.1: Advantages and Disadvantages of Waste Disposal Systems (in Indian Scenario) – Composting
| S.No | Item | Aerobic Composting | Anaerobic Composting | Vermicomposting |
| | Foul odour in process | Yes | Yes | No |
| | Quality of End Product | Moderate | Moderate to Good | Good to Excellent |
| | Time for Composting | 2-3 weeks | 6-8 months (minimum) | 6 months (minimum) |
| | Use for production of gas (CH4) | No | Yes (in controlled environment) | No |
| | Attracts rodents, pests, dogs, etc. | Yes | No | No |
| | Need for Constant Monitoring | Low | High | Very High |
| | Storage capacity of end product | Low | Low | High |
| | Market demand | Moderate | Moderate | High (for agriculture) |
| | Power requirements | Yes (if mechanised) | No | Yes |
| | Intensity of skilled labour requirement | Low | Moderate | High |
| | Land requirement | Low | Moderate | High |
| | Quality of waste segregation | Moderate | High | Very high |
| | Leachate pollution | High | High | Low |
| | Contamination of aquifers (large scale) | High | Moderate to high | Low |
| | Capital Investment | Moderate | Moderate | High |
| | O&M Costs | Moderate | Moderate | High |
Table 3.2: Advantages and Disadvantages of Waste Disposal Systems (in Indian Scenario) – Waste-to-Energy
| S.No | Item | Incineration | Pelletisation | Pyrolysis | Bio-Methanation | Landfill Gas Recovery |
| | Requirement for segregation | High | Very High | High | High | |
| | Energy recovery (in optimum conditions) | Around 14 times waste stream | Around 14 times waste stream | Around 14 times waste stream | Around 11 times waste stream | Around 11 times waste stream |
| | Direct Energy Recovery | Yes | No | Yes | No | No |
| | Overall efficiency in case of a small set up | Low | Low | Moderate | High | Low |
| | Efficiency in case of high moisture | Very low | Very low | Low | Moderate | Moderate to High |
| | Land requirement | Low | Low | Moderate | Low to Moderate | High to very high |
| | Transportation costs | Moderate | High | High | High | Very high (depends on location of landfill) |
| | Ability to tackle bio-medical and low-hazard waste | Yes | No | Yes (to some extent) | No | No |
| | Concerns for toxicity of product | High | NA | NA | NA | Moderate to High |
| | Leachate Pollution | None | None | None | High (in case of no protection layer) | High (Landfill) Low (Sanitary Landfill) |
| | Concern for Atmospheric Pollution | High (not easy to control) | Moderate | Moderate (easy to control) | Low | Moderate |
| | Sustainability of source/ waste stream | Moderate | Low | Low | Low | High |
| | Capital Investment | High | Very High | Very High | Very High | High |
| | Power requirements |
Background
This study concerns entirely with the Integrated Urban Environment Improvement Project (IUEIP). The IUEIP was launched in areas falling under jurisdiction of Bangalore Development Authority (BDA) in 1998 and was piloted in 4 BDA schemes. Supported by the Norwegian Embassy (NORAD), this project was designed as a collaborative effort of NGOs, government agencies and resident groups. The IUEIP addressed four main components:
This study focuses on the first component only. Close to the beginning of the new millennium, the BDA recognised the need to adopt alternative means for environmental improvement as an integral part of entering the new millennium. In 1998 it designed an alternative approach to developing and maintaining civic amenities through an integrated urban environment plan. The plan was based on a holistic approach, with an in-built system for coordination between various agencies, and with the local residents as the focus of activity. The adopted a 'stakeholder' approach, drawing in resources of NGOs and local residents to address specific issues in the areas, thereby creating and building community awareness of neighbourhood management.
Stakeholders/Partnerships
Primary Stakeholders: Residents of the 4 target schemes and BDA were the primary stakeholder with an overall objective of handing over the area to BMP with an existing plan in place.
Funding Agency: NORAD (Government of Norway)
Technical Stakeholders: Centre for Environment Education (CEE), Tata Energy Research Institute (TERI), Myrthri Sarva Seva Samiti and Technology Informatics Design Endeavour (TIDE).
Other Stakeholders: resident associations, waste scavengers, BMP, BWSSB, KPTC, Bangalore City Police, BMTC, other civic and emergency services of city.
Description of the Project
The SWM component of the IUEIP focussed on development of local level plans for segregation at source, reduction of waste at primary levels, decentralised composting and marketing of end products, recycling, and transfer of wastes to secondary collection points.
The first step included a detailed study and survey of the four schemes to generate information on quantity and quality of waste, water sources, sewerage and drainage systems, existing waste practices in waste management, and identification of suitable land for setting up of composting facilities. This information was used to develop an action plan which was discussed with the residents and approved.
Before execution of the plan, a thorough environmental education (EE) programme was undertaken and all residents, commercial users, servants, etc., were covered. Different technique of EE were used depending on socio-cultural lifestyles of target groups. Most important component of EE was need for quality segregation at source.
Simultaneously waste management committees were set up to monitor and manage the programme. Members of WMCs were trained by the technical experts. Door-to-door segregated collection was initiated in August 1998. All wastes were transferred in specially designed low-cost rickshaws. Localised compost plants were constructed and all biodegradable wastes were transferred to the compost facility. All recyclables were sold by the waste collectors (erstwhile rag pickers, scavengers, etc.) which added to their monthly remunerations. The monthly remunerations of the waste collectors was fixed. Remaining waste (low quantities of recyclables, soiled wastes, and hazardous wastes) are transferred to secondary collection points of BDA.
Compost Facilities
Localised compost facilities were set up in the residential area. Usually an open ground or buffer area was preferred. Eight compost facilities were installed for the first two layout schemes. Although composting facilities originally used aerobic decomposition, they are now being converted to vermicomposting technology with special microbial cultures obtained from the University of Agriculture Sciences, Bangalore in a step-to-step process. This switch will take time since vermicomposting is a more expensive option and requires large capital and O&M investments. The compost pits are of the size of 9 x 4 x 3 ft and it takes an average of 60 days for a compost to be ready, which is then sieved to retrieve the finer compost, while the coarser compost is put back into the pits with fresh garbage. All compost pits are lined with bricks and waterproof material and have sheds over them to protect them from rain and sun. Mesh wires have been provided around the facility to keep away stray animals (see picture).
Financial Outlay
The IUEIP has a three-year time span for execution. The budgetary provision included Rs.363.28 lakhs with funding from NORAD accounting for Rs.290 lakhs (around 80% of the budget) and the remaining Rs.73.28 lakhs contributed from implementing agencies. The O&M costs are recovered from residents and sale of compost to residents and outsiders.
Cost Recovery
Households need to pay Rs.15 per month to the WMC which manages the bank account jointly with CEE. Composts are sold at Rs. 2/- per kg to residents and Rs. 6/- per kg to outsiders. Vermicompost, which has a large market demand, is sold at Rs.7.50/- per kg. One of the biggest purchasers of this compost has been the Horticulture Wing of BDA which uses it in its parks, medians, buffers, etc.
Management Issues
The management of the entire project lies with the WMCs with support from the local NGOs. The monthly remuneration for the workers, overhead charges, and O&M costs from running the project as well as the compost facilities are managed by the WMC from the monthly charges collected from residents and shopkeepers.
Environmental Hazards
This is a low environmental hazard procedure. It results in waste reduction at primary level, which have a direct environmental benefit. This reduces the load on the landfills as well as reduce transportation costs and thus, environmental costs from lesser fuel usage. The negative side effects of aerobic composting (foul odour) has been done away with time and shifting in parts to vermicomposting. Use of lined pits (lined with brick and waterproof) ensures that there is no leaching, especially during rainy season. These pits have been covered to protect them from direct rain and fenced to protect them from stray animals. Over a period of time a 'green screen' consisting of trees and bushes have been created to visually cut off the compost facilities from surrounding areas (see picture).
Marketability Issues
The compost produced from these facilities is of good quality; they are being used by neighbouring agriculture farmers (who use the coarse compost as it is better suited for rice produce), organic farming industry, floral industry, etc. The Horticulture Wing of BDA is another major buyer of this compost and uses it for improving greenery on medians, buffers, parks, etc. (see picture). Improved SWM in these colonies have also had an impact on cost recovery for other services, with residents more willing to pay for water supply, sewerage and drainage services. Real estate values of these areas have also gone up.
Sustainability Issues
Operating Parametres of the Composting Plant of m/s Excel Industries, Mumbai
| Volume of Garbage: 450 m3/day | Weight of Garbage: 300 TPD |
| Quality of Garbage: Unsegregated | Total Land Requirement: 6 Ha. |
| Capital Investment (excluding land cost: Rs. 2.5 crore | |
| Value of Product: Rs.1300/ton | Net Return per ton of Garbage Processed: Rs.100-120 |
Source: FEC & Delphi, 1997
Although the IUEIP is over, SWM in the target areas is still ongoing managed by WMCs. In fact, WMCs have been able to recover enough money from residents and sale of compost not only for sustainable management, but also for shifting from aerobic form of composting to vermicomposting, which is a more costly, though environment-friendly, option. Following the demonstration of success of this initiative, many other colonies/schemes in Bangalore have taken up similar initiatives on their own. Therefore, at a decentralised level, this is a sustainable project and this technology/process can be easily transferred to other cities in
1. Download goodkeywords to find keywords that are relevant to the products you are selling, nearly every man and his dog uses goodkeywords, its free, once downloaded just select the keyword suggestion tool and type in a word, it will tell you what keywords and search terms people are searching for. First, think about the theme of the site and write down the most popular words that come to mind. Ensure they are words that are likely to be used in finding the site's content
2. Go to Blogger, create a new blog, its free, use relevant keywords for the name of your blog - ie: workfromhomeblogspot etc.., create up to 5 blogs, link 4 blogs to your main blog just by placing the URL for your main blog onto the other 4 blogs, you can create as many blogs as you like with links all pointing to your main blog, each blog should have the same affiliate product but using slighlty different keywords on each blog title and URL. Submit your blogs to the 3 main search engines Google, Yahoo and MSN, go to pingomatic.com and ping your blogs.
3. CONTENT IS ALWAYS KING. Post good articles.
Www.seochat.com, goarticles and EzineArticles (also free) - there are many more resourceful web site that helped me a lot.4. use http://pingomatic.com/ to ping your blog after each new posting. This will bring the search engine spiders to your blog.
| Capacity (Tons / Day) |
| S.No. |
| PARAMETER |
He says this idea was floated keeping in mind the vision of former President Dr APJ Abdul Kalam [Images] who had said that it was essential to create a knowledge bank.
How it works
Those interested in joining the course would have to pick up a pre-paid scratch card known as Edu Card. Suresh says they have tied up with Reliance [Get Quote] who will be selling the cards. For the IT finishing course, there are two options available -- re-skilling and up-skilling.
Re-skilling involves enhancement of built up skill. It basically finetunes the skill of a candidate. This card is available at Rs 1,500. Up-skilling would involve the teaching of new skills. Suresh says there are various cards available for this course and the pricing is between Rs 499 and Rs 5,000.
Suresh says for students who are confused as to what they ought to be learning, they could pick up a card for Rs 499 where details of the various course will be available. The student could take a mock test and the results will be available online. Based on his/her performance s/he would decide on what course s/he wants to do.
The scratch card provides a 16-digit number which a candidate needs to use to log in and create an account. Once a candidate logs in, s/he will get the study material online. Suresh says care has been taken to give a classroom feel to the course. Guest lectures will be available online and students could also participate in group discussions sitting at home, he adds.
Considering the fact that internet speeds are not great in rural India, Suresh says the delivery of the package is available at a mere 40 kpbs speed through a dial-up connection also. He says slow connectivity will not be an issue for students taking up this course.
The examinations too will be online, Suresh adds. Prior to taking up the examination, a student gets a chance to test his skills through a meter to help assess one's performance. If a student thinks s/he is ready, then s/he could take the examination.
The number of attempts a student can make would depend on the denomination of the card. A student who has picked up a card for Rs 499 could make up to 50 attempts and this card would be valid for a year. A Rs 1,500 card would enable a student to have 100 attempts while the Rs 5,000 card would give a student 250 attempts.
A student who uses up all the attempts would have to purchase another card, Suresh says. However, it would be better to get through in the minimum number of attempts as it would read well on the bio-data, he adds.
For those students who complete the up-skilling course they would be certified by T�V Rheinland. Suresh says this certificate will enable students get global validity. The certificate will have a seal of authentication by way of a Global Access Code and the same will be made available in the global database of T�V Rheinland.
The students can connect to the prospective employers by using this unique GAC that vouches for the authenticity of their knowledge base. Suresh says a certificate for those students taking up the re-skilling course will also be provided. However, the certification would be done by Mindlogicx.
The commercial launch of the online finishing school is scheduled for the second week of August 2008. Queries are already flowing in and the responses have been best from Maharashtra, Tamil Nadu and Karnataka, informs Suresh. However, he adds that the response has been better from students in the city when compared to the rural areas. "Over the months we will spread awareness regarding this course in the rural areas."