Sri Lanka Fairway group to make fertilizer, electricity with garbage
Apr 21, 2017 18:25 PM GMT+0530 | 1 Comment(s)
PROCESS FLOW: A flow diagram of a waste to energy plant used in the UK
ECONOMYNEXT - Sri Lanka's Fairway group which won a waste management concession said it will process 500 tonnes of garbage a day into power and fertilizer using an incinerator and an organic waste decomposition plant.
Fairway Waster Management (Pvt) Ltd was given the Thumbowila-Karadiyana waste dump, in a suburb of Sri Lanka's capital Colombo, which already has two million tonnes of waste which is leaching into nearby waterways, land and the air.
The site is emitting large volumes of methane (the main component of biogas) which can be seen bubbling out of leachate around the area. The firm says and sulphur and nitrogen oxides are also emitted to the air.
"While the project will not stop the current level of emissions immediately, the organic waste that will be kept out of the landfill will stop future emissions from occurring," Fairway said in a statement.
At another site in Meethotamulla, in Colombo, over 30 people died and over 100 houses were destroyed after piled up waste generated a rotational landslide.
Fairway will build a 425 tonne a day, mass burn incinerator, using Danish and German technology complying with European Union standards.
The firm says it expects to generate 79 million units of electricity from a waste driven power plant.
The government had earlier proposed that the state-run Ceylon Electricity Board pay 36.20 rupees a unit for 20 years for the power generated.
At the moment the site receives small amounts of waste separated at source, as well as large volumes of mixed municipal garbage.
Industry analysts say in Sri Lanka, municipal waste has a large portion of moist food waste and less high calorie material that can be burned to produce power.
Fairway said it will build biological treatment plant that will process fast-degradable, high moisture content organic waste in a wet fermentation anaerobic digestion system.
Biogas generated from the process will also be used to generate power.
This system will treat a maximum of 115 tons of fast degradable organic waste per day.
About 45,000 tonnes of liquid fertilizer and 7500 tonnes of solid fertilizer will be produced at the site.
Processing will reduce the solid material that will eventually go to a landfill by 90 percent, the firm said. (Colombo/Apr21/2017)