Affiliation:
1. a Anhui Municipal Sludge Disposal and Resource Utilization Engineering Technology Center, Anhui Province Tongyuan Environmental Environment Co., Ltd, Hefei 230031, China
2. b College of Resources and Environment Science, Anhui Science and Technology University, Fengyang 233010, China
3. c Ecological Environment Protection Comprehensive Administrative Law Enforcement Detachment of Wuhu, Wuwei 238300, China
4. d School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China
Abstract
ABSTRACT
The Standards, Measurements, and Testing (SMT) phosphorus fractionation approach was used to measure the amounts of total phosphorus (TP), organic phosphorus (OP), inorganic phosphorus (IP), apatite inorganic phosphorus (AP), and non-apatite inorganic phosphorus (NAIP) in sludge biochar. Sludge biochar was characterized using methods such as X-ray diffraction, elemental analysis, and Fourier transform infrared spectroscopy. The findings showed that IP content increased significantly after pyrolysis, reaching up to 97% of TP content at the optimal temperature of 350 °C. Furthermore, when the pyrolysis temperature increased, the AP/IP ratio showed fluctuations between decreases and increases, maximum at 60%. The results of the correlation analysis indicate that IP has a positive correlation with yield, pH, and S elements (p < 0.05) and a negative correlation with N, C, and H elements (p < 0.01). OP, on the other hand, has a positive correlation with H elements (p < 0.05) and a negative correlation with yield (p < 0.01). Furthermore, TP, NAIP, and AP all show negative correlations with N, C, and H elements (p < 0.01), with TP and NAIP also displaying negative correlations with pH and S elements (p < 0.05).
Funder
Outstanding Youth Research Project in Anhui Provincial Scientific Research Plan Project