Just a decade ago, Kendari was among the filthiest cities in Indonesia. Bins overflowed with bags of mouldy rice, rotting food scraps and plastic bottles. Reeking garbage was burned or left uncollected on the streets for weeks, attracting flies and roaches.

But today, the city of half a million people in south-east Sulawesi province has been spectacularly transformed, winning national cleanliness awards for eight straight years.

Rubbish trucks clear the streets twice a day, while residents have made sorting and recycling their household waste a habit.

"We were among the dirtiest cities in Indonesia. This made us very embarrassed and determined to change the situation," former city mayor Asrun told The Straits Times in June. His son took over the post this month.

His biggest success was setting up Kampung Mandiri Energi, or "Independent Energy Village", in Puuwatu district, which produces methane gas from organic waste in the city's biggest landfill.

With a small budget of $20,000, officials planted cheap plastic pipes deep into the city's main landfill to collect trapped methane gas, which was then filtered and used as cooking gas or passed through old car engines modified into generators to produce electricity, benefiting 150 poor families in the area.



PVC pipes that collect methane gas in Kendari. Officials planted cheap plastic pipes deep into the city's main landfill to collect trapped methane gas that is then used for cooking or to produce electricity.



WONDERS OF WASTE Everything is free. I'd never thought rubbish could be so valuable. HOUSEWIFE KUSTINA KASIM, who is one of the villagers benefiting from the project to trap methane gas from waste and turn it into cooking gas or electricity.

WHAT A WASTE

How Asia is dealing with its growing rubbish problem: • Cities worldwide now generate around 1.3 billion tonnes of municipal solid waste (MSW) a year. This is expected to nearly double to 2.2 billion tonnes a year by 2025. • Asia accounts for around 30 per cent of the global volume, and is estimated to generate 1.8 million tonnes of MSW a day by 2025. Growth in waste quantities is fastest in Asia. • The higher the income level and rate of urbanisation of a country, the greater the amount of solid waste it produces as its consumption is greater. So an average person in Singapore currently generates 1.49kg of waste a day, and in Japan, it is 1.71kg a day. In comparison, an average person in Indonesia produces 0.52kg of waste a day, while in India, it is 0.34kg a day. • Higher-income countries have more efficient disposal systems, which means they are able to keep the volume of waste fairly stable. For instance, by 2025, waste generated by an average person will rise 20 per cent in Singapore and drop 0.5 per cent in Japan. In contrast, it will jump more than 63 per cent in Indonesia and double in India. • Asian countries have adopted various waste-disposal methods such as sanitary landfilling, recycling, composting, converting waste to energy such as electricity and heat, or incineration. Some are tackling the problem at the root, avoiding or reducing waste by using less packaging material and charging for plastic shopping bags. • There is no one-size-fits-all solution to the waste problem as countries in Asia are diverse in income level, government policies, and even the type of waste generated. More developed nations dispose of their waste through incineration or waste-to-energy treatment, while less developed countries use landfilling or open burning.

"Everything is free. I'd never thought rubbish could be so valuable," housewife Kustina Kasim, 31, told The Straits Times.

She and her husband, Anas, a waste worker, used to spend $50 a month on kerosene for cooking. Given that they have two school-going children to support, it was a strain on the family's finances.

The 18ha site currently boasts a composting station and even a flying-fox facility for adrenaline junkies.

The government plans to develop part of it into a green zone for recreational activities and an off-road biking track.

The city administration has also developed mini methane plants in the city's markets.

Mr Asrun hopes the central government could take a leaf out of its book and "take concrete steps to replicate this on a larger scale", nationwide.

Kendari is an anomaly in the country of 261 million people, as well as many parts of Asia, where soaring populations and rapid urbanisation have spurred consumption in goods and services, which in turn has increased the volume of waste.

By 2025, world cities are expected to generate 2.2 billion tonnes of municipal waste a year, nearly doubling the 2012 figure of 1.3 billion tonnes a year, according to the World Bank.

Developing countries in Asia, home to some of the world's largest landfills, are responsible for much of this waste.

Overburdened landfills and inadequate collection and disposal services mean that significant amounts of waste are disposed of in waterways and uncontrolled landfills or are openly burned, polluting the air with toxic smoke and exposing urban dwellers to health risks such as groundwater pollution and respiratory diseases.

"The waste management issue in South-east Asia is very serious," Mr David Hooper, a principal consultant at Singapore-based engineering consultancy Ispahan Group, told The Straits Times.

"Almost all Asean countries have horror stories - people living on landfills, people dying young, landfills having landslides that kill people, waste burned on street corners," said Mr Hooper, who has 27 years of experience in global waste management.

In Sri Lankan capital Colombo, more than 30 people were killed after a garbage dump collapsed in April, while in China, fears are mounting over cancer-causing heavy metals and dioxin being released into the air, due to cost-cutting measures by privately run incineration services.

In the Philippines, a dump site in the capital was dubbed "Smokey Mountain" for smoke emanating from rotting debris and flammable materials that caught fire spontaneously.

It was shut down two decades ago but another landfill in Payatas district remains a treasure trove for some 10,000 scavengers. In 2000, 200 people were killed in a landslide there.

The problem of waste in Indonesia, especially in the capital Jakarta and other major cities, has been chronic enough for Environment and Forestry Ministry waste management director Sudirman to describe it as a "state of emergency" two years ago.

He told The Straits Times in June that some cities are "simply not too bothered about the environment".

Government initiatives such as the "reuse, reduce, recycle" programme have had little success.

Recycling accounts for an average 7.5 per cent of waste management in big cities, but the figure drops to 1.9 per cent across the archipelago.

Last year, the government introduced a plastic bag levy but participating cities later opted out, citing poor monitoring and public resistance.

The lack of enthusiasm is perhaps why the authorities are keen to burn rubbish despite a court ruling against it in January.

Said Mr Sudirman: "There's just too much rubbish, it's hard to even clear the roads. We simply have to use incinerators to get rid of it."

Experts warn that incineration used by high-income countries such as Singapore is not suitable for developing countries as incinerators are expensive to build, require skilled manpower to run, and need to be fed with non-organic waste such as paper and plastic. A large proportion of waste produced by developing countries is organic food waste, which is moist and hard to burn.

Waste-to-energy plants could solve the twin problems of waste management and need for energy generation, but "Indonesia's energy consumption is still low compared with its South-east Asian neighbours", said Dr Ronny Purwadi, lecturer at Bandung Institute of Technology's chemical engineering department.

And then there is the issue of safety. Mr Hooper warns of pipes turning brittle in the sun and breaking, and gas leaking in homes.

"Explosions can occur, or people could suffocate," he said.

"There is no single technology that is the silver bullet to waste management," he said.

"The solution will include a range of technologies, from sanitary landfill or producing fuels to replace coal."

Perhaps, awareness and education still remain key to changing mindsets and tackling the issue.

Mr Anas from Puuwatu said it was tedious sorting the rubbish and ensuring only organic waste ends up in the landfill.

"Now that we are getting free gas, we know it's worth it," Mr Anas said.

"People think dump sites are filthy and disgusting. But when they come here, they ask, 'Where's the rubbish? Why is there no smell?'"

• Additional reporting by Raul Dancel