Influence of potassium addition on phosphorus availability and heavy metals immobility of biochar derived from swine manure.

ABSTRACT: Pyrolysis of animal manure at high temperature is necessary to effectively immobilize heavy metals, while the available phosphorus (P) level in biochar is relatively low, rendering it unsuitable for use as fertilizer. In this study, the pretreatment of swine manure with different potassium (K) sources (KOH, K₂CO₃, CH₃COOK and C₆H₅K₃O₇) was conducted to produce a biochar with enhanced P availability and heavy metals immobility. The addition of all K compounds lowered the peak temperature of decomposition of cellulose in swine manure. The percentage of ammonium citrate and formic acid extractable P in biochar increased with K addition compared to undoped biochar, with CH₃COOK and C₆H₅

SUBMITTER: Liu T 

PROVIDER: S-EPMC11387754 | biostudies-literature | 2024 Sep

REPOSITORIES: biostudies-literature