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Extraction and precipitation of phosphorus from sewage sludge

机译：从污水污泥中提取和沉淀磷

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摘要

Raw sewage sludge from East Rand Water Care Association (ERWAT) had high phosphorus (P) content, approximately 15.2% (w/w) P_2O_5, which indicates a potential resource for the limiting nutrient. Leaching sewage sludge with 1 M sulphuric acid at 5% solid loading for 2 h 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 100 min with a rate of reaction of about 2 × 10~(-5) s~(-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.
机译：东兰德水利协会（ERWAT）的原始污水污泥含磷量很高，P_2O_5约为15.2％（w / w），这表明它是限制营养的潜在资源。在固体含量为5％的条件下，用1 M硫酸将污水污泥浸出2 h，可将磷提取率达82％。但是，磷是以磷酸铁的形式回收的，因此需要使用离子交换去除铁的进一步纯化步骤以提高P的释放程度。氧化镁和氢氧化铵分别用作镁和氮源，以及pH调节剂以沉淀出作为鸟粪石的P。沉淀出57％鸟粪石，沉淀物中的总磷含量为25.9％。动力学研究表明，磷的浸出在最初的100分钟内遵循Dickinson模型，反应速率约为2×10〜（-5）s〜（-1）。限速步骤由扩散控制。磷在2％批评剂酸中的溶解度几乎为96％，这是将沉淀物用作肥料时植物可利用的磷量。在沉淀物中发现了革兰氏阳性环境枯草芽孢杆菌，对环境无害，因为它们已经存在于可以用作肥料的沉淀物中。

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