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评估在无氧/无氧/有氧系统中主流P回收的机会

Mengqi Cheng¹, Congcong Zhang¹, Albert Guisasola¹

¹GENOCOV, Departament d'Enginyeria Química, Biològica i Ambiental, Escola d'Enginyeria, Universitat Autònoma de Barcelona, Bellaterra, Barcelona, Spain.

The Science of the total environment

|November 28, 2023

概括

主流 (P) 从废水中回收是有效的. 从无氧-无氧-有氧 (A2O) 过程的无氧阶段提取废弃活性污泥 (WAS) 可以显著提高P回收和PAO活性.

科学领域:

环境工程环境工程
水处理技术水处理技术
营养物质的恢复营养的恢复

背景情况:

污水处理厂 (WWTP) 在同时去除营养物质和回收 (P) 方面面临着挑战.
增强的生物去除 (EBPR) 对于P去除至关重要,但整合P回收可能是复杂的.
传统方法经常从有氧反应器中提取废物活性污泥 (WAS),这可能会限制P回收效率.

研究的目的:

为了比较主流P回收的有效性,在A2O过程中从无氧和有氧反应堆中提取WAS.
评估 WAS 提取位置对营养物质去除和回收的影响.
评估WAS发酵提高可溶性P可用于沉的效率.

主要方法:

在不同的条件下运行试点规模的无氧-无氧-有氧 (A2O) 过程.
从有氧和无氧反应堆中提取WAS的比较.
评估WAS发酵动力学和P度变化.
沉模型用于评估 struvite 形成潜力和局限性.

主要成果:

有氧和无氧 WAS 提取策略都取得了成功的营养去除.
无氧 WAS 提取显著增强了聚酸盐积聚生物 (PAO) 的活性,在无氧反应器中增加了 ~ 27% 的 P 度.
无氧WAS发酵在3天内达到高P度,而有氧WAS发酵需要7天.
在无氧WAS场景中,发酵使可溶性P的可用性从24.4%增加到51.6%.
斯特鲁维特沉模型表明,由于Ca2+干扰而存在限制,并限制了Mg2+和NH4+.

结论:

通过无氧WAS提取进行主流P回收是WWTP的可行策略,改善EBPR和P回收.
无氧 WAS 提取和发酵增强可溶性 P 的可用性,优化了 P 恢复的条件.
优化的降水场景表明P回收高达51%的输入P,主要是 struvite,虽然Ca2 +干扰需要管理.

关键词:

化学平衡模型化学平衡模型增强的生物去除 (EBPR)移除营养物质移除营养物质 P 恢复恢复恢复

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The Phosphorus Cycle

The Phosphorus Cycle

Unlike carbon, water, and nitrogen, phosphorus is not present in the atmosphere as a gas. Instead, most phosphorus in the ecosystem exists as compounds, such as phosphate ions (PO43-), found in soil, water, sediment and rocks. Phosphorus is often a limiting nutrient (i.e., in short supply). Consequently, phosphorus is added to most agricultural fertilizers, which can cause environmental problems related to runoff in aquatic ecosystems.

Bioremediation

Bioremediation

Bioremediation is the use of prokaryotes, fungi, or plants to remove pollutants from the environment. This process has been used to remove harmful toxins in groundwater as a byproduct of agricultural run-off and also to clean up oil spills.