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Measuring Biomethane Potential of Food Scrap Waste Anaerobically Co-Digested with Waste-Activated Sludge Using Respirometry

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[Integrating technologies for urban communities' municipal solid waste minimization].

Chuan-Bin Zhou¹, Jing-Ru Liu, Ru-Song Wang

¹State Key Laboratory of Urban and Region Ecology, Research Center for Eco-Environmental Science, Chinese Academy of Sciences, Beijing 100085, China. cbzhou@rcees.ac.cn

Huan Jing Ke Xue= Huanjing Kexue

|January 22, 2011

Summary

This study integrates manual separation and food waste processing to improve urban solid waste management. The technology significantly reduces municipal solid waste and produces effective compost leachate fertilizer.

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Area of Science:

Environmental Science
Waste Management
Sustainable Technologies

Background:

Urban communities face challenges in municipal solid waste (MSW) management, particularly with insufficient source separation and high moisture content in food waste.
Effective management strategies are crucial to mitigate environmental impacts and resource loss.

Purpose of the Study:

To investigate an integrated technology for managing urban municipal solid waste, focusing on manual source separation of food waste.
To assess the characteristics of community-separated food waste and the efficacy of composting leachate as a fertilizer.

Main Methods:

Implementing manual separation of food waste at the community level.
Analyzing the chemical composition (organic matter, nutrients, C/N ratio, heavy metals) of separated food waste.
Processing composting leachate through biological stabilization and dilution.
Evaluating the fertilizer efficiency of treated leachate by measuring plant growth (Impatiens).

Main Results:

Manual separation achieved a rate of 36.8 kg/h, with potential for improvement.
Community-separated food waste exhibited high organic matter (44.493%) and nutrient content (N, P, K), with lower heavy metals compared to centralized separation.
Food waste retained high moisture content (78.7%), posing challenges for composting.
Treated composting leachate demonstrated fertilizer efficiency, promoting plant growth 1.46-2.49 times greater than tap water.
The integrated technology reduced overall municipal solid waste by 52.6%.

Conclusions:

Community-based manual separation is effective in improving food waste quality for potential resource recovery.
Integrated waste management strategies, including food waste processing and leachate treatment, can significantly reduce MSW.
Treated composting leachate shows promise as a viable fertilizer, contributing to a circular economy approach in waste management.