Recovery of Calcium Phosphates from Composted Chicken Manure

Abstract

To recover phosphorus from composted chicken manure, a batch method with aqueous HNO 3 , HCl and H 2 SO 4 was used to examine the elution behavior of the aqueous calcium and phosphate contained in the manure. Since the main components in manure are Ca 2+ and K + along with PO 4 3and those ions can be dissolved using an acidic eluate, it was expected that most of the aqueous Ca 2+ , K + and PO 4 3could be obtained via the elution. Therefore, it seemed plausible that the removal of the aqueous K + obtained by the elution of composted chicken manure would result in the formation of calcium phosphates. If calcium phosphates are formed, they can be used for phosphate rock, which also consists of various calcium phosphates. When using 0.1 mol/L HNO 3 , HCl or H 2 SO 4 , the elution behavior of the PO 4 3was not dependent on the acids. However, 0.1 mol/L H 2 SO 4 was not sufficient for the elution of Ca 2+ , probably due to the precipitation of the calcium sulfate. The eluted amount of K + using 0.1 mol/L HNO 3 was lower than that using 0.1 mol/L of either HCl or H 2 SO 4. Since the poor elution of K + should enrich the concentrations of Ca 2+ and PO 4 3in the acidic aqueous solution after the elution, it was suggested that aqueous HNO 3 would be suitable as an eluate in the present system. After the elution of the composted chicken manure, when 0.1 mol/L HNO 3 was used to adjust the solution pH of the acidic aqueous solution to greater than 6, Ca 2+ and PO 4 3were precipitated, but K + was not. The precipitate was calcium hydroxyapatite, one of the typical components of phosphate rock, which showed that composted chicken manure could be replaced phosphate rock as a new source of phosphorus.

Changes in soil phosphorus availability and associated microbial properties after chicken farming in Lei bamboo (Phyllostachys praecox) forest ecosystems

“…However, BCF altered the composition of moderately labile P in this study, and 1 M HCl‐Pi gradually dominated with increasing grazing density (Figure 2b). This observation can be linked to three possible phenomena: (a) the deposition of chicken manure gradually increases soil pH with increasing grazing density (Somda, Powell, & Bationo, 1997), which reduces the adsorption performance of iron–aluminum oxides (Yan, Wang, Liu, & Feng, 2019) and prevents it from complexing with more free phosphorus; (b) the stability of HCl‐extracted P is strongly dependent on soil pH, and HCl‐extracted P pools in high‐pH soils tend to contain highly stable calcium phosphate minerals (Helfenstein et al, 2020; Hou, Lu, Jiang, Wen, & Luo, 2019); and (c) the higher Ca 2+ in chicken manure may complex with dissolved Pi in the soil to form 1 M HCl‐Pi (Sugiyama et al, 2016). In synthesis, the P fraction was influenced by grazing density, and an increase in labile and moderately labile P increased the soil P availability and supply capacity in the BCF system.…”

Recovery of Phosphoric Acid and Calcium Phosphate from Dephosphorization Slag

“…e study revealed that calcium phosphate and calcium hydroxyapatite could be easily recovered by ammoniatreatment of the nitric acid extract from the incineration ash of chicken manure (Sugiyama et al, 2019(Sugiyama et al, , 2020 and from composted chicken manure (Sugiyama et al, 2016). We established that chicken manure could be used as a new phosphorus resource.…”

Influence of Peat and Biochar on Gas Emissions and Microbial Metabolism During Co-composting of Chicken Manure and Maize Straw

“…It is estimated that approximately 457 million tons of CM are globally produced each year [1]. CM is a vital fertilizer resource for farming and gardening [2] because it is rich in organic matter and essential plant nutrients such as nitrogen, phosphorous, calcium and potassium [3,4]. However, CM contains many pathogens, parasite ova, and toxic substances [1], and the direct application of CM into the soil would cause a series of environmental and social problems [5,6].…”

“…4 , N 2 O and NH 3 during co-composting of CM and MS. Biolog EcoPlate analysis revealed that PT and MSB enhanced the microbial metabolism involved in carbohydrates, esters and carboxylic acids throughout the composting period. The emissions of CH 4 , N 2 O and NH 3 were significantly associated with microbial metabolism, which was influenced by temperature, NH 4…”