Study on the Changes of Maturity Indexes in the Composting Process of Chaohu Lake Sediment

Abstract

 Using the method of composting in the greenhouse, the research was carried out in a 1:1 ratio between the sediment of Chaohu Lake and the deciduous garden stalks by adding a small amount of pig manure to adjust the carbon-nitrogen ratio for composting. The results showed that the temperature and pH both increased first and then decreased during the composting process. During the composting process, the high temperature of 55℃ for more than 4 days meets the temperature sterilization requirements of composting hygiene. During the entire composting process, the moisture content, organic matter, and total nitrogen all showed a downward trend, and the loss of organic matter was about 50.84%. The seed germination index showed an upward trend, eventually reaching 93.1%. After 5 weeks of composting and fermentation, all the composting indicators have reached or approached the GB8172—1987《Urban Waste Agricultural Standards》.