Kitchen Waste and Municipal Waste Eco-Energy Solutions

With the development of society, economy, and urban construction, waste management has increasingly become a major issue affecting the national economy and people’s livelihoods. In recent years, the “NIMBY” (Not In My Backyard) problem in municipal waste management has become a serious issue impacting sustainable urban development. Many cities are facing the situation where landfills are nearing capacity and incineration plants are difficult to establish. Is there a third way to effectively break through?

The National Development and Reform Commission and the Ministry of Housing and Urban-Rural Development’s “Implementation Plan for the Classification of Household Waste” requires the implementation of mandatory waste classification in 46 cities nationwide, aiming for a recycling rate of household waste to reach over 35% by the end of 2020. How to process the waste collected after classification? Especially in the context of our country where classification is difficult to achieve thoroughly, what technology is more suitable for kitchen waste?

The waste management issues faced by China today are similar to those encountered by Germany 30 years ago, and Germany’s response measures and technological solutions are highly worth learning from.

Jiangsu Weili Environmental Technology Co., Ltd. has, after years of effort and continuous investment, developed EMBT technology suitable for the characteristics and requirements of Chinese waste in collaboration with its German partners, based on the introduction of mature German technology, and successfully applied it to the classification of kitchen waste and mixed municipal waste treatment and energy utilization in China and other regions in Asia.

The principle of its technology is to treat waste (classified kitchen waste or mixed municipal waste) as a mixture of organic matter and combustible materials. Through the biological hydrolysis process, easily biodegradable organic matter in the waste is hydrolyzed and acidified, followed by dewatering to achieve the separation of organic slurry and combustible materials. The slurry undergoes anaerobic digestion to produce biogas for biological energy utilization, while the separated solid phase component has a moisture content of about 40% and a low calorific value of 1600-2000kcal/kg. If further biologically dried to a moisture content of 10%, the calorific value can reach 3000-4000kcal/kg, making it suitable as RDF fuel for industrial kilns such as cement kilns and power plants, or it can be utilized through incineration/gasification.

Significant Waste Reduction and Resource Recovery

• Biological hydrolysis system achieves a reduction rate of over 60%;

• Solid phase of biological hydrolysis has a moisture content of about 40%, with a low calorific value of 1600-2000kcal/kg;

• The high calorific RDF product after biological drying has a moisture content of 10% and a low calorific value of 3000-4000kcal/kg.

Simple Pre-treatment and Strong Process Applicability:

• Biological hydrolysis reactor has strong adaptability to waste composition and its changes;

• Mechanical pre-treatment stage has a simple sorting process;

• Suitable for situations where waste classification is not ideal.

Significant Environmental and Ecological Benefits:

• Processes such as biological hydrolysis and sorting reduce the chlorine content in RDF products;

• Physical properties of the product are uniform, and calorific value is significantly improved;

• Favorable for combustion pollution control and effectively improves calorific value utilization.

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