Recovering gas from garbage

After more than two years of research, Dr. Nguyen Quoc Binh, Ho Chi Minh City Institute of Tropical Technology and Environmental Protection and colleagues successfully studied the technique of burning waste gas recovery.

With this technique, 1kg of waste will get 2.2m ³ of gas. Accordingly, waste will be classified to remove inorganic substances, non-flammable materials such as sand stone, cement, metal . then hashed to suit each type of furnace.

Closed combustion (not causing environmental pollution) from 750 ^o C - 1,200 ^o C through stages: drying, pyrolysis, oxidation, reducing impurities. Post-combustion products include gas mixtures such as hydrogen (H ₂ ), carbonmonoxide (CO), methane (CH ₄ ), nitrogen (N ₂ ), high hydrocarbon compounds (crude gas) and dust impurities, ash, tarry .

Dr. Binh is introducing the pilot-scale waste incinerator line.Photo: V. Photo

Gas is cleaned through stages: separating coarse dust, separating plastic, cleaning acid gas (when necessary), separating fine dust and putting it to use. The gas testing results burn pollutants that meet emission standards TCVN 5939 - 2005.

Equipment for this closed combustion system is completely active by domestic materials, equipment and technology (except burners). Currently, Dr. Binh is conducting procedures to build this system for Song Xanh Co., Ltd. in Ba Ria - Vung Tau province with a capacity of 200 kg of waste per hour, with an investment cost of about 2 billion VND. In addition to burning waste, the system also allows gasification of agricultural by-products such as rice husk, straw, coffee shell.