摘要
以市政污泥为原料，在300、500、700℃条件下热解制备得到污泥生物炭。采用碱液吸收法测定生物炭在培养环境下的CO2释放速率以表征其降解速率，并采用预测模型计算得到生物炭的半衰期。以去离子水为浸提剂考察了生物炭中可溶性养分含量及其淋溶特性。结果表明：在300～700℃范围内，较高温度下制备的生物炭降解缓慢，稳定性更强，可在自然环境中长期存在，具有更好的固碳效果；较低温度下制备的生物炭中水溶性氮、水溶性钾含量更高，但水溶性磷含量更低；生物炭中养分的淋溶效果与其可溶性养分含量一致，较低温度下制备的生物炭的淋溶液中水溶性氮、水溶性钾含量较高，水溶性磷含量较低。
The biochar was produced from sewage sludge by pyrolysis at 300, 500 and 700℃. In this study the biochar degradation rate represented by CO2 release rate through alkali absorption method in microbial incubation was investigated and the half-life using a recommended prediction method was predicted. In addition, deionized water was used to investigate the content and leaching properties of the water-soluble nutrients contained in biochar. During the temperature range of 300—700℃, the biochar produced at higher temperature was degraded slowly and had longer half-life, which may exist in soil for a longer time span and then perform a better effect on carbon sequestration than that produced at lower temperature. However, biochar produced at lower temperature contained more water-soluble N and K but less water-soluble P, which was agreed with the concentration of leaching nutrients. The leaching water of biochar produced at lower temperature also contained more much water-soluble N and K but less water-soluble P.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2015年第7期2664-2669,共6页
CIESC Journal
基金
国家重点基础研究发展计划项目(2011CB201501)
国家自然科学基金项目(51406207)~~
关键词
市政污泥
热解
生物炭
降解
养分元素
sewage sludge
pyrolysis
biochar
degradation
nutritive element
