Carbon emission reduction benefits of domestic waste treatment methods

"Proceedings of the Chinese Academy of Sciences" in 2022, based on the emission coefficients of the "China Product Life Cycle Greenhouse Gas Emission Coefficient Set  (2022)", and with reference to the EASEWASTE/EASETECH  model analysis method developed by the University of Denmark, the three terminals of various domestic wastes Comparative analysis of the carbon emission reduction benefits of treatment methods.

The analysis results show that:

①In a scenario where landfilling is the main part and biogas is partially recycled for power generation, the emission equivalent is  0.61 ton CO2/ton of garbage;

② In the scenario of mainly incineration and landfilling of ash and slag, the emission equivalent is -0.12 ton CO2/ton of garbage. Compared with landfill disposal, waste incineration power generation has obvious carbon emission reduction benefits;

③Based on resource utilization, that is, after domestic waste recycling and screening, a comprehensive treatment method of anaerobic fermentation of food waste, combustible waste incineration, and other landfill treatment, the emission equivalent in this scenario is  -0.068 ton CO2/ton Rubbish.

Compared with mixed waste incineration, although the carbon emission reduction benefit is reduced, the carbon emission reduction benefit will be higher than that of incineration after recycling and reusing the recyclable materials from garbage screening.

Taking plastics as an example, although carbon emissions are generated during the recycling process, the emission equivalent after recycling is -0.24 ton CO2/ton of garbage.

From this point of view, in the end-of-line domestic waste treatment method, the higher the proportion of recycling and resource treatment, the higher the carbon emission reduction benefits it will bring.

Harden Domestic Waste Recycling Disposal

A domestic waste resource processing center in Beijing, China, has given a different solution to the dilemma of this garbage-sieged city.

It adopts advanced Harden domestic waste recycling disposal system, through multiple solid waste shredding technology such as “shredding, screening, AI intelligent sorting, wind shifter, and magnetic separation”.

The whole process separates metals, heavy materials, renewable plastics, organic kitchen waste, etc. from domestic waste, and prepare most of the low-value recyclable resources in domestic waste, such as waste plastics, waste paper, foam, etc., into RDF Alternative fuels.

Its output resources and recycling uses:

① Plastic bottles and other plastic products are used for recycling into PE particles;

② Various metals are used for smelting and recycling;

③ RDF fuel with high calorific value is used for coal-fired cement plants, power plants, etc. Coal substitution in enterprises.

④ Organic kitchen waste can be fermented into compost or used for soil improvement in landscaping.

As the first comprehensive treatment line in Beijing with a resource utilization rate of 80% for domestic waste, it not only turns more than 80% of domestic waste into recyclable or reusable resources, but also effectively reduces the amount of landfill and Amount of burning.

It is estimated that it can save 300,000 tons of waste disposal in landfills and 450,000 tons in incineration sites every year, which is equivalent to reducing carbon dioxide emissions by about 1 million tons.

This method of recycling domestic waste provides a highly innovative and feasible solution to the problem of domestic waste disposal.