waste by biogas tunnel bring high economic efficiency, especially for those enterprises of the livestock, or farming households. It saves drying energy, lighted lamp, dryer barn, used hot water, fridge, gas-powered, gas-powered bath vase, rice cooker, gas-powered ... high energy cost savings. In addition to the substance of sub-products of Biogas system used for fertilizer for crops will reduce the use of chemical fertilizers, saving the cost of fertilizer for the farmers that the crop yield is still not steady
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