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Solid Waste Management

On-site composting yet to take off

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The Hindu       27.03.2017 

On-site composting yet to take off

More work needed:A view of the on-site composting unit at Anna Nagar Uzhavar Sandhai in Tiruchi.Photo: M. SrinathM_SRINATH  

The corporation has set up the unit at the Uzhavar Sandhai in Anna Nagar

The Tiruchi City Corporation, which had spearheaded its men and machines to score marks on various parameters of Swachh Bharat ranking till a few months ago, is now using its energy to spearhead its mission on popularising on-site composting, a latest concept of disposing perishable garbage at the source itself.

However, the on-site composting unit set up at Uzhavar Sandhai in Anna Nagar is yet to begin the process of converting waste into organic manure.

The compost unit was not just to dispose the garbage at source but also to demonstrate the method of vermi composting to the customers, who visit the Uzhavar Sandhai to buy vegetables and fruits daily.

The Tiruchi Corporation constructed two cement pits – one for storing and the other for producing enriched compost by letting earthworms. Each pit can store about 6 tonnes of solid waste such as disposed vegetable and rotten fruits.

As asked by the officials of agricultural marketing, one of the agencies in manning Uazhavar Sandhai, the vegetable vendors dumped the perishable waste in the pits for some days.

However, enquiries revealed that the process had been suspended due to lack of insufficient storage pits, poor planning and execution.

It is said that at least five pits are needed for producing manure. The garbage dumped in pits will have to be shifted to the next pit for once in a week for natural composting process. It will take four weeks for producing organic manure from the waste.

The fifth pit will be used for vermi compost process.

However, there are just two pits in the Uzhavar Sandhai.

Moreover, they are said to be very small in size. They are not even sufficient to store garbage generated in two days. Similarly, the cement floor laid on the pits is said to be causing bad smell.

“We have closed the garbage dumped in a pit to prevent bad smell. We need at least three more pits for a proper on-site composting. Till then, we cannot dump the garbage in the pits,” says an official of Agricultural Marketing that manage the Uzhavar Sandhai.

He said the issue had been brought to the knowledge of Tiruchi Corporation officials, who had promised to look into the issue.

“We want the on-site composting at Uzhavar Sandhai as a model. Steps will be taken with the support of line departments to set a proper unit. It will motivate the customers to replicate the model in their big establishments,” the official said.


Corpn. picks new technology for disposing plastics waste

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The Hindu       27.01.2017    

Corpn. picks new technology for disposing plastics waste

HIGH TIME: Erode Corporation has evaluated various technologies for solid waste management.-PHOTO: M. GOVARTHANM.GOVARTHAN ;M.GOVARTHAN - M_GOVARTHAN  

The City Corporation has evinced interest in pyrolysis process for recycling plastic wastes, after evaluating the latest technologies presented by leading solid waste consultants at a recent seminar organised jointly by Olirum Erodu Foundation and Confederation of Indian Industry - Erode Zone.

The seminar witnessed presentations on integrated and sustainable solid and liquid resource management, decentralised treatment system for bulk waste generator, bio mining and cost reduction in sewage purification technology.

Plastic disposal being the core of waste management, the Corporation would pursue adoption of pyrolysis technology, Corporation Commissioner Seeni Ajmal Khan said.

Land to the extent of an acre was the only requirement of the implementing entity that has already proved efficacy of the technology in Hyderabad and has won the assent of Madurai Corporation for adopting the process of converting waste plastic into fuel, he said.

According to experts, the process of anhydrous pyrolysis leads to production of liquid fuel similar to diesel from plastic waste, with a higher cetane number and lower sulphur content than traditional diesel. It is considered environmentally preferable to landfill.

The Corporation generates solid waste in excess of 250 tonnes a day in Erode City, the seventh largest urban agglomeration in Tamil Nadu. The garbage generated in homes, hospitals, shops and educational institutions is collectively gathered and segregates at the main dump site in Vendipalayam and the smaller one at Vairapalayam. As in Vendipalayam, equipment for mechanised segregation of plastic waste would be installed in Vairapalayam, Mr. Ajmal Khan said.


Waste fuels community kitchen

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The Hindu         08.09.2016 

Waste fuels community kitchen

Corporation plans another bio-digester in Tiruchi

Women cooking in the community kitchen at Viragupettai in Tiruchi.— Photo: M. Moorthy
Women cooking in the community kitchen at Viragupettai in Tiruchi.— Photo: M. Moorthy

A community kitchen fuelled by methane that has been generated from the faecal waste of a nearby toilet complex and discarded vegetables from the Gandhi Market is setting a new benchmark in eco-friendly sanitation technology in the city.

The biogas settler project, worth Rs. 40 lakh, has been constructed by the Tiruchi City Corporation in Viragupettai, a former open firewood market and ground that was being used for open defecation on East Boulevard Road. It has been functional since February. The toilet complex and kitchen are being managed by the sanitation non-governmental organisation (NGO) Gramalaya, through its WAVE federation of self-help groups.

The technological know-how for the plant has been provided by the Namakkal-based Sundaram Fab, a firm with 25 years’ experience in biogas generation projects.

The Corporation is looking into replicating the success of the project in other economically deprived areas of the city as well. “Another bio-digester plant has been proposed at the Woraiyur market that will be attached to a community kitchen,” Corporation Commissioner N. Ravichandran told The Hindu . He added that the Rs. 25-lakh project was expected to benefit at least 100 families on the Kalnaickan Street.

Methanisation is the decomposition of organic matter without oxygen by microbial ecosystems. It produces a gas, called biogas, made up of methane and carbon dioxide.

In the Viragupettai project, the bio-methanisation plant needs 500-600 kg of bio-degradable waste. Around 100-150 kilos are from the toilets and the remaining 450-500 kilos are sourced from the Corporation’s solid waste collection. The waste form the toilets and vegetable waste are fed directly into the reactor through underground drainage pipes.

The kitchen that neighbours the reactor has 16 single-hob stoves that can be used throughout the day.

“The total capacity of gas produced from the bio-methanisation plant is 30 cubic metres. Out of this 8 cu.m is used for the plant’s need and 22 cu.m for the community kitchen,” said Amuthavalli, Executive Engineer of Tiruchi Corporation.

The urban slum of Viragupettai has 2,000 residents. “The kitchen is free for those living in the slum. Most of these people are often forced to cook with firewood stoves on the pavement because their tenements are very small. This hall gives them an opportunity to make food in a hygienic manner,” said X. Selva Mary, a WAVE volunteer at the project.

The slurry water is directed to a collection pond with water hyacinth and fish, while the overflow is used as liquid manure for plants.

The Viragupettai toilet complex (segregated for men, women and children) was built in 2001 by Gramalaya with funding from the international charity Water Aid, as part of its public hygiene campaign against open defecation.

The well-maintained area bears no resemblance to its earlier life as a ground notorious for overflowing faecal matter.

Today, two women staff members from self-help groups are in charge of maintaining the complex. Separate workers are employed to clean the toilets daily. A Re. 1 token allows the families in the slum to use the toilet multiple times a day. Other users, such as those frequenting the markets and temples nearby, are charged per visit. “We are able to save around Rs.1,000 from the user fees, which we reinvest in maintenance work,” said Gramalaya volunteer Shanmughavalli. “We hope more areas in Tiruchi will be able to create similar eco-friendly hygiene projects.”

Tiruchi Corporation generates 469 tonnes of garbage at the rate of 417 grams per capita. Of this, 60 per cent of waste is bio-degradable, said Corporation sources.


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