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From Bio-Waste to Bio-Energy

Source:Ringier Release Date:2011-05-30 889
Food & Beverage
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Cassava starch producer sets world environmental benchmark for transforming waste into green energy

 Two scrubbers are used to remove H2S in the biogas before the biogas is sent to the gensets to make electricity

PROCESSING 1,200 tons of cassava a day, Chokyuenyong Industrial Co Ltd in the north-eastern Thailand province of Nakhon Ratchasima, has shown what it takes to become a leading international industrial citizen and good local neighbour to surrounding homes and businesses by using anaerobic technology with a capacity of 3,200m3 effluent a day. The installation provides an international model of how it is possible to attain top environmental standards of wastewater cleanliness whilst generating green power and carbon credit profits as well.

To cut effluent Chemical Oxygen Demand (COD) pollution levels at its cassava production plant by more than 95 per cent whilst extracting gas from its wastewater to power its boilers and generate electricity for its own use and to sell back to the provincial grid, Chokyuenyong Industrial partnered with Global Water Engineering. The innovative Asian starch producer in Asia and GWE aim to show the world just what can be achieved by adopting advanced technology to reduce pollution, save power and enhance profitability at the same time.

Chokyuenyong, which is headed by Tawatchai Yuenyong, commissioned local GWE agent Retech Energy to install the system. Refined over the past three years, the Chockyuenyong installation:

? Cuts the COD pollution level of influent wastewater from 22,500 ml/l (14,525mg/l Biochemical Oxygen Demand, BOD) to less than 1125 mg/l, resulting substantially cleaner discharges to treatment ponds and ultimately the environment  (and in the process dramatically reduced odour from typical ponds)

? Returns up to 2.7 Mw of electricity a year to a provincial power grid, PEA, which serves some areas distant from major generating sources and welcomes fresh input of green power generated locally

? Saves the equivalent of up to 21,000 litres a day of fuel oil by producing up to 34,000 Nm3 of bio gas, which is used to power the boilers and heating equipment used extensively in cassava drying and processing and to generate electricity for the large amounts of rotating equipment used in processingNike Air Max 2017

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