HAO Xiao-di,YU Wen-bo,SHI Chen,et al.Potential Analysis and Market Prospects of Phosphorus Recovery from the Bottom Ashes of Sludge Incineration[J].China Water & Wastewater,2021,37(4):5-10.
污泥焚烧灰分磷回收潜力分析及其市场前景
- Title:
- Potential Analysis and Market Prospects of Phosphorus Recovery from the Bottom Ashes of Sludge Incineration
- Keywords:
- wastewater treatment; sludge incineration; bottom ash; phosphorus recovery; recovered phosphate fertilizers; rock phosphate fertilizers
- 摘要:
- 磷资源不可替代又不能再生。现代工业攫取磷矿大多用于磷肥生产，通过作物收获的粮食、蔬菜以及饲养畜禽肉类进入人体，而随食物进入人体的大多数磷（90%）会随排泄物进入污水（无粪尿返田情况）。尽管最终进入污水中的磷占开采磷矿的比例很小（<5%），但这是人类除动物粪便与作物秸秆外唯一可能实现磷人工循环的位点，相对于转移进作物中的磷来说该比例超过1/4。因此，在废弃粪尿返田之原生态习惯的情况下，从污水处理过程中回收磷则显得非常重要。目前从污水处理过程中回收磷存在许多方式与产品，而与污泥焚烧灰分相关的磷回收程度最高，可达90%。为此，首先基于全球磷资源危机与我国磷流向及其估算,揭示磷回收的必要性和急迫性。然后，对与污泥焚烧相关的灰分磷回收技术以及潜在应用进行总结和分析。最后，根据肥效实验与成本估算，认定灰分再生磷肥比传统矿石磷肥具有潜在市场前景，特别是它的可持续意义。
- Abstract:
- Phosphorus resources are irreplaceable and non-renewable either. Modern industry grabs phosphorus ores mainly for synthesizing phosphate fertilizers, and most of phosphorus (90%) entering human bodies via the food chains (crops, vegetables and meats) is finally transported into wastewater (without excreta returning to farmlands) discharged by human beings. Although phosphorus entering wastewater only accounts for a small proportion of phosphate ores (<5%) compared to exploited P-ores, this is the only site possibly recovering phosphorus besides animal manure and straws, which takes a share of >25% of phosphorus transported into crops. Under the circumstance of giving up excreta returning to farmlands, thus, recovering phosphorus from wastewater is very important. There are many approaches to recovering phosphorus and its products from wastewater nowadays. Phosphorus recovery relating to the bottom ashes of excess sludge incineration could reach up to the highest extent, up to 90%. Based on the global phosphorus crisis and its flowing patterns and evaluations in China, the article first revealed the importance and urgency of phosphorus recovery, followed by summarizing and analyzing the associated techniques and potential applications of phosphorus recovery from the bottom ashes. According to the fertilizer values and estimated prices, recovered phosphorus fertilizers from the bottom ashes could be finally believed to have a better market prospect than synthesized phosphate fertilizers, in particular which is sustainable.
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