Aqueous leaching of cattle manure incineration ash to produce a phosphate enriched fertilizer

作者：Oshita Kazuyuki^*; Sun Xiucui; Kawaguchi Koji; Shiota Kenji; Takaoka Masaki; Matsukawa Kazutsugu; Fujiwara Taku

来源：Journal of Material Cycles and Waste Management, 2016, 18(4): 608-617.

DOI：10.1007/s10163-016-0528-6

• Cattle manure incineration ash
• Aqueous leaching
• Phosphorus (P)
• Fertilizer
• Salinity

Ash produced from the combustion of livestock manure contains large amounts of phosphorus (P), which is an important resource as a fertilizer. Some studies have extracted and recovered P from incinerated biomass ash using inorganic acid or alkaline agents, which produce wastewater that requires treatment and is expensive due to the cost of chemicals. Livestock manure ash contains not only P, but also water soluble salts, which could be a negative influence on plant growth and shall be preferably removed from the recovered fertilizer. In this study, we removed salinity from cattle manure incineration ash by simple aqueous leaching, while retaining the P content. The optimal condition was a 20 min leaching time at a liquid/solid (L/S) ratio of 10 mL g-ash(-1). Under this condition, over 90 % of Cl and 20 % of Na in the original ash was removed, while over 99 % of the P was retained in the leached residue. The leached residue met the fertilizer standard in Japan in terms of citrate soluble fertilizer components and contained few heavy metals. X-ray analyses of the ash indicated that Cl was mainly present as KCl in the original ash, while P was mainly present as Ca compounds in the ash.

• 出版日期2016-9