Key Laboratory of Soil Contamination Bioremediation of Zhejiang Province, School of Environmental and Resource Sciences, Zhejiang A&F University, Lin'an, Hangzhou, 311300, China.
Key Laboratory of Recycling and Eco-treatment of Waste Biomass of Zhejiang Province, Zhejiang University of Science and Technology, Hangzhou, 310023, China.
Environ Sci Pollut Res Int. 2018 Sep;25(26):25772-25779. doi: 10.1007/s11356-017-0301-y. Epub 2017 Oct 26.
In China, intensive pig farming has led to serious environmental issues with the need to dispose off large quantities of pig manure. Chinese agriculture relies on high inputs of chemical fertilizers leading to gradual decreasing organic matter contents in many arable soils. We propose that hydrochars produced from pig manure could potentially replace chemical fertilizers and, at the same time, resolve the waste disposal problem. The hydrochars used in this study were produced from pig manure at five different pyrolysis temperatures ranging between 160 and 240 °C and three residence times (1, 5, and 8 h). All hydrochars were assessed for composition of major elements. Results showed that the yield and organic matter (OM) contents in hydrochars were 50-74% and 40-56%, respectively. The concentrations of total nitrogen (N), potassium (KO), and OM in the hydrochar decreased, whereas contents of phosphorus (PO), copper (Cu), and zinc (Zn) increased with increasing reaction temperature and time. Hydrothermal carbonization of pig manure is a rapid method for transforming pig manure into an organic fertilizer, but it is necessary to assess the potential soil contamination risk of Cu and Zn for the pig manure hydrochar as organic fertilizer.
在中国，集约化养猪导致大量猪粪需要处理，从而产生了严重的环境问题。中国农业依赖于大量化肥投入，导致许多耕地土壤中的有机质含量逐渐减少。我们提出，由猪粪制成的水热炭有可能替代化肥，同时解决废物处理问题。本研究中使用的水热炭是由 5 种不同热解温度（160-240°C）和 3 种停留时间（1、5 和 8 小时）的猪粪制成的。所有水热炭都进行了主要元素组成评估。结果表明，水热炭的产率和有机物（OM）含量分别为 50-74%和 40-56%。随着反应温度和时间的增加，总氮（N）、钾（KO）和 OM 的浓度降低，而磷（PO）、铜（Cu）和锌（Zn）的含量增加。猪粪的水热碳化是将猪粪转化为有机肥的快速方法，但有必要评估猪粪水热炭作为有机肥时 Cu 和 Zn 的潜在土壤污染风险。
