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Converting Waste Agricultural Biomass into a Resource - UNEP

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The Rice Straw / Hulls Technology basic process is as follows:<br />

Rice straw/hulls pass through a shredder<br />

Shredded material passes to a steam explosion where dilute sulfuric<br />

acid is added to the material<br />

The material then passes to a counter current extractor containing<br />

NaOH solution. This process will place the silica and the lignin in<br />

solution<br />

The lignin-silicate solution passes to our ultrafiltration system where the<br />

silicate solution passes through the membrane and the lignin solution is<br />

concentrated<br />

The material leaving the counter-current extractor is washed and<br />

hydrolyzed, fermented and converted to fuel ethanol, or the lignin fuel<br />

separated by the ultrafiltration system is used to provide energy for the<br />

operation of the plant.<br />

A Block Diagram of the Colusa <strong>Biomass</strong> Energy Corporation process -<br />

Process Drawing & RO/UF Drawing<br />

Note: The “green” blocks are products<br />

209

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