Abstract:
In order to solve the rural living garbage processing problems, we independently developed a unique technology of clean and comprehensive utilization of rural garbage resources, referred to as PGAS technology. Based on modern biodegradation and automatic sorting, we built a complete industrial chain with mixed domestic waste as mineral raw material. The garbage trucks transport rural garbage and directly discharged into the hopper. Quickly biofilm is sprayed to deodorize garbage, then the garbage bags are teared at the same time of feeding. At the transportation, we utilize magnetic and eddy current sorting to get metal products and residues, while the residue will be transferred into the tearing machine and the biological treatment silo, where the raw garbage is mixed by composite bacteria liquid and enzyme liquid. The organic pus would be pumped to anaerobic fermentation system, while the residue would be alternatively tearing through broken drum to main sorting system. By our innovated equipment, we obtain inorganic material as sand and glass, pulp and sundries like bamboo textiles, and pure plastic at last. The products would be further processing to industrial materials as required of market. The sand and gravel glass and other inorganic materials can produce hollow blocks, paving brick and sponge brick. The pulp would change to the pulp products which can be directly used for producing cardboard and corrugated paper. The plastic can be packaged directly to sale, or be used in oil refining, even can be further sorted to monomer plastic, such as PE, and to produce particles. The slurry is pumped into the biogas tank for producing the methane gas through anaerobic fermentation system, which can be reused as energy. And the slurry after anaerobic fermentation, through evaporation, can be sprayed into powder or granular fertilizer. This technology subverted the traditional mode of rural waste disposal, which is the only comprehensive utilization of rural garbage with all components. The whole processing line is close with no smelly gas. There is no sewer in the whole plant with no waste water emissions, the water is in circulation. There is no operator in the whole plant, the sorting is automatic. Take the PGAS demonstration project in Yuanqu County, Shanxi Province as an example. The project was completed in 2017 and has been put into operation for 1 year with a processing capacity of 100 t/d. The radiation area includes 2 towns and 3 townships with about 100 000 people. According to this waste plant's operation data, treating 1 ton waste by PGAS, we can obtain the average amount of 65 kg organic fertilizer, 105 kg pulp, 124 kg plastic, 133 kg waste derived fuel, 135 kg sand, 55 kg methane and 11 kg metal. The cost is about 180 yuan, and the output value is about 325 yuan. The investment cost is nearly 40% less than that of incineration. After the sewage treatment, the removal rate of various pollution factors reaches 88.76% on average, which is used for recycling. It is proved that this technology can improve the efficiency of waste disposal. This technology has considerable economic benefits, is environmentally friendly, and has high promotion value.