Extraction and precipitation of phosphorus from sewage sludge

鸟粪石 化学 浸出(土壤学) 污水污泥 磷酸 降水 磷酸盐 污水 无机化学 环境化学 环境工程 环境科学 土壤水分 有机化学 土壤科学 气象学 物理
作者
Nothando C. Shiba,Freeman Ntuli
出处
期刊:Waste Management [Elsevier BV]
卷期号:60: 191-200 被引量:112
标识
DOI:10.1016/j.wasman.2016.07.031
摘要

Raw sewage sludge from East Rand Water Care Association (ERWAT) had high phosphorus (P) content, approximately 15.2% (w/w) P2O5, which indicates a potential resource for the limiting nutrient. Leaching sewage sludge with 1M sulphuric acid at 5% solid loading for 2h resulted in an 82% phosphorus extraction. However, the phosphorus was recovered as iron phosphates, thus a further purification step using ion exchange to remove iron was required to increase the degree of P release. Magnesium oxide and ammonium hydroxide were used as magnesium and nitrogen sources, respectively, as well as pH regulators to precipitate P as struvite. 57% struvite was precipitated and the total phosphorus content of the precipitate was 25.9%. Kinetic studies showed that the leaching of phosphorus follows the Dickinson model for the first 100min with a rate of reaction of about 2×10-5s-1. The rate limiting step is controlled by diffusion. Phosphorus solubility in 2% critic acid was almost 96%, which is the amount of phosphorus available to plants if the precipitate is applied as a fertiliser. Environmental, gram-positive Bacillus subtilis were found in the precipitate, which are harmless to the environment since they already exist in the soil where the precipitate can be applied as a fertiliser.
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