Characterization of Poultry Litter Ash in Environmental Point of View

In this study, a poultry litter ash (PLA) sample was characterized in environmental point of view and examined for its utilization potential as a raw material for P-based fertilizer. Within this scope, several characterization methods, such as ICP-MS, SEM and EDX analyses were conducted. In addition, TS EN 12457-4 leaching test was performed to evaluate leachability characteristics of heavy metals. According to the results, Ca, P and K were determined as the major elements in PLA with 29.54, 6.13 and 4.96%, respectively. Although the sample contains 2472 ppm Zn and 922 ppm Cu, their solubility determined by the leaching test is below the toxicity limit for hazardous waste. In particular, PLA is categorized as inert and non-hazardous waste for the respective solubility of Cu and Zn probably due to the high concentration of zinc. Despite its relatively much lower concentration compared to copper, solubility of Cr makes PLA non-hazardous because of high mobility of chromium, especially hexavalent state. In terms of the major elements, about 290 mg/l Ca was detected in the leachate, resulting in a pH value higher than 13. High Ca solubility makes PLA a highly alkaline waste, causing the major difficulty for its direct use as a fertilizer. P concentration in the leachate was found only 0.0092 mg/l, which also limits the use. Overall results have suggested that the poultry litter ash sample examined could have a utilization potential as a partial replacement material for the production of P-based fertilizers. However, its high alkalinity should be neutralized prior to its use.

Dergi

PROCEEDINGS OF THE 6TH EURASIA WASTE MANAGEMENT SYMPOSIUM, EWMS 2022

Yıl

2022

Sayfa

255-259

WoS UID

WOS:001248725000039