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Pulp sludge at landfill

Wright Tech Systems Inc Organic Waste to Energy



Organic Wastes

In the past, organic wastes like the organic fraction of MSW, Source Separated Organics (SSO), sewage sludge (biosolids), pulp sludge, animal rendering (SRM), FOG's, wood waste, manures, agricultural, off spec products, wet distillers grain and soiled papers or cardboard usually ended up either being landfilled, land applied or composted.

In landfill,  the biodegradable components decompose and emit methane a greenhouse gas 23 times more potent than carbon dioxide and the cause of significant environmental problems. Other components (e.g., leachate) can also cause significant environmental pollution in air and ground water, and give rise to odour. In general, valuable resources are wasted. For these reasons most countries have set targets or Directives (EU 99/31/EEC) to reduce their dependence on the use of landfills.

Landspreading organic wastes such as sewage and pulp sludge is often used to replace conventional fertilizers. However, landspreading also involves the application of the pollutants contained in the sludge to the soil. These pollutants undergo different transformations or transfer processes. These pollutants and health risk processes can include leaching to groundwater, runoff, non-destruction of pathogens, microbial transformations, heavy metals, prescription drugs, hormones, odor, GHG emissions, plant uptake and volatilization and enable transfer of compounds into the air, water  and their subsequent introduction into the food chain.

Compost typically presents a more stable and more acceptable byproduct than landspreading, but the concentration of heavy metals or other contaminants may limit its application. In addition, compost must be properly converted (reactor, open or anaerobic based technologies) and stabilized (windrowing, etc) to be used as a finished commercial product. This can take considerable time (3 to 6 months), labor, equipment, storage, land and there is always the potential for odors and vector attraction. Finally, the end product is often seasonal, limited to a local market, supply can quickly outpace demand and compost may generate little to no revenue for the owner. Therefore, long term sustainability and profitability is always a concern.

As a result, the market was looking for a more cost effective, sustainable and environmentally sound solution to their organic waste problem. Wright listened to our client's needs and developed the patented Biodryer to convert organic wastes into a valuable biomass fuel instead.

Organic Waste to Energy

Biosolids spread on field
Organic fraction of MSW or SSO