TECHNOLOGY FOCUS - BIOTECHNOLOGY - Preferred Chamber: The bio-chamber further comprises several oxygen probes, where at least one of the oxygen probes is being positioned in each of lower region, middle region, and upper region of the receiving chamber, and several temperature probes, where at least one of the temperature probes is being positioned in each of lower region, middle region, and upper region of the receiving chamber. Several holes are arranged in a grid pattern defining several square cells, with one hole being positioned at each node of the grid pattern, and one hole being positioned at a center of each of the cells. The cells are approximately 10 cm by 10 cm. The holes have width of 4-5 mm. The biochamber further comprises an exhaust fan connected to the receiving chamber, and cover for the receiving chamber that is at least partially removable. The chamber unit comprises a sea container or a shipping container. The sea container or shipping container has walls that are at least partially covered with stainless steel sheets, and the partition comprises at least one stainless steel sheet. At least one air blower has a motor power of at least 0.75 kW, pressure of at least 4200 Pa, and volumetric flow rate of at least 9.5 m3/minute for each 2.2 m3 mass contained in the receiving chamber, where the mass has height of 1.5 m. Preferred Method: The method further involves crushing the poultry manure to a particle size of 5-10 mm before the poultry manure mixed with the carbon carrier. The carbon carrier is sawdust. The mixture has pH value of 6-8, carbon/nitrogen ratio of 23:1 to 26:1, moisture content of 49-54%, oxygen concentration of above 5%, temperature of below 90 degrees C and temperature permitted to rise to 75 degrees C, and is maintained at 75-85 degrees C until the biodegradation is complete. The oxygen concentration of the mixture is permitted to fall to 6%, and then maintained at 5-13% until the biodegradation is complete. The organic fertilizer has more than 50% organic matter, and nitrogen, phosphorus and potassium in a ratio of 2:2.5:2.5 to 2.7:3.0:3.0. The organic fertilizer is free of pathogens, salmonella, and weed seeds. The production line further comprises dryer and machine for making granules. EXAMPLE - No suitable example given.