Influence of pyrolysis temperature on biochar stability and leaching properties of nutrients contained in biochar

doi:10.11949/j.issn.0438-1157.20150253

Abstract

Abstract:

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.

Key words: sewage sludge, pyrolysis, biochar, degradation, nutritive element

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。

关键词: 市政污泥, 热解, 生物炭, 降解, 养分元素

CLC Number:

X705

LU Tao, YUAN Haoran, WANG Yazhuo, HUHETAOLI, CHEN Yong. Influence of pyrolysis temperature on biochar stability and leaching properties of nutrients contained in biochar[J]. CIESC Journal, 2015, 66(7): 2664-2669.

鲁涛, 袁浩然, 王亚琢, 呼和涛力, 陈勇. 热解温度对污泥生物炭稳定性及养分淋溶特性影响[J]. 化工学报, 2015, 66(7): 2664-2669.

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