Physicochemical changes and maturity evaluation of solid organic waste compost

Abstract

Abstract: Composting is one of the most effective ways for recycling of organic solid waste. Various characteristics of different kinds of organic solid waste cause various physicochemical changes during composting, as well as the different composting conditions. Stability and maturity evaluation are the measurement for compost quality and the safe guarantee for its agricultural utilization. Stability evaluation of compost focuses on the impacts to environment after its agricultural utilization, while maturity evaluation pays attention on the phytotoxicity to plant. Stability and maturity of compost are affected by several factors, such as the characteristics of raw materials, the composting condition, and so on. Stability could be assessed by compost temperature, color, evolution rate of CO₂, consumption rate of O₂, content of NO₃^--N and quantities of pathogen, etc. Temperature was suggested to be one of the most convenient parameters for stability evaluation. Maturity could be assessed by various parameters, including the chemical, biological, and phytotoxical parameters. Seed germination index, as the phytotoxical parameter, was recommended to be one of the most convenient and reliable parameters of maturity evaluation.

Key words: Solid organic waste, Composting, Stability, Maturity, Evaluation

CLC Number:

S141.4

HUANG Guofeng, ZHONG Liuju, ZHANG Zhentian, WU Qitang. Physicochemical changes and maturity evaluation of solid organic waste compost[J]. Chinese Journal of Applied Ecology, 2003, (5): 813-818.

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