The Kinetics Research For Municipal Garbage's Aerobic Composting Process

As a kind of safe and effective treatment of solid waste, and enables reuse of organic matter and nutrients, composting plays an important role in waste management schemes and organic farming today, and has a wide application prospects. Modern composting plants must comply with strict environmental regulations, including gas emissions such as nuisance odors. Designing composting plants to meet these requirements using current trial-and-error strategies is too costly and time consuming and poor performance and failure are too often the result. Mathematical reactor models can serve as an essential tool for faster and better process designs, system analysis, and operational guidance.However, almost all reactor models developed so far are based on empirical kinetic formulations, restricting the generality and thus applicability of the results. To achieve greater generality for design and analysis, a mechanistic model for composting kinetics is needed.The Oxygen Uptake Rate (OUR) is the amount of oxygen that is taken up by a unit sample of waste in a unit period of time. It is the most important composting process rate indicator as it is directly linked to the composting reaction, it is linearly linked to heat production independent of molecular substrate composition, and it is a direct measure of composting stability. On the other hand, as a result of excessive oxygen will cause a great deal of heat dissipation through water evaporation, thus lower the pile temperature; Also with the lack of oxygen will make substantial breeding of anaerobic bacteria, gas volatile, odour produce and lower composting rate, and make sure the value of OUR equals make sure the optimal quantity of oxygen supply. hence it has a great meaning of practice guidance to research OUR in composting.Therefore, based on the former scholar's research, this article establishs a kinetic model for simulating OUR's change during the composting process on the basis of single particle's internal constructure analysis. Biochemical reaction dynamics, material transfer, and other principles are synthetically used in modelling process, and we design a experiment to confirm the model's validity. The results basically conform the actual situation. This model has wider applicability, and has the function to optimize the composting process control, aid the design of technologic flow and system analysis.