... has a wide range of raw material production routes. At present, there are more than 20 kinds of materials that have been successfully used for extrusion granulation: ammonium nitrate, urea, ammonium chloride, calcium nitrate,
... the organic matter in the wastewater to achieve water purification. Near the center of the biological rope, due to the reduction of dissolved oxygen, an anaerobic state is easily generated, and these microorganisms can consume the nitrate nitrogen in the
