Methane recovery from anaerobically treated wastewater

废水被认为是生物甲烷的一种有前途的来源，生物甲烷是一种清洁的高能量密度燃料。Anaergia** 公司是提供废物能源回收解决方案的领跑者。Anaergia的一个重点是 ** 开发一种高效的废水处理工艺，以最大限度地提高生物甲烷产量。Anaergia最近 ** 开发了Omnivore工艺，有效地浓缩废水并促进微生物活性用于 ** 废水处理。虽然这一过程可以大大增加甲烷的产量，但在废水处理过程中产生的生物甲烷 ** 以溶解气体的形式存在，因此需要额外的步骤来提取。然而，典型废水的相对较低温度（~ 15 °C）使得难以捕获生物甲烷，因为甲烷在较低温度下变得更可溶。这一技术障碍限制了 ** 充分利用他们的Omnivore工艺生产生物甲烷，并从城市 ** 废水中收集。该研究开发了一种新的分离工艺，可以在很宽的温度范围内有效地从 ** 废水中提取溶解的甲烷。这个过程使用了一种全憎膜，一种特殊的膜，可以抵抗液体的润湿。溶解的甲烷从废水中抽出，穿过全憎膜，进入具有高甲烷溶解度的溶剂。本研究的主要目的是（1）** 确定适当的提取溶剂，（2）甲烷提取的演示，以及（3）调查环境条件对甲烷提取效率的影响。甲烷提取的成功示范将证明大量可用的城市废水作为清洁生物燃料来源的潜力。与Omnivore工艺相结合，所提出的方法可能会将目前 ** 耗能的处理过程转变为净能源生产者。

Wastewater is recognized as a promising source for biomethane, a clean, high-energy density fuel. Anaergia**Inc. is a front runner in providing solutions for energy recovery from wastes. One such focus of Anaergia is to**develop an efficient wastewater treatment process for maximized biomethane production. Anaergia recently**developed Omnivore process that effectively concentrates wastewater and facilitates microbial activity for**wastewater treatment. While this process can dramatically increase the methane production, biomethane**produced during wastewater treatment exists as dissolved gas and therefore requires additional steps for its**extraction. However, the relatively low temperature of typical wastewater (~ 15 °C) makes it difficult to**capture the biomethane, as methane becomes more soluble at lower temperature. This technical barrier limits**the full utilization of their Omnivore process for biomethane production and harvesting from municipal**wastewater.**The proposed research develops a novel separation process that can efficiently extract dissolved methane from**wastewater at a wide range of temperature. The process employs an omniphobic membrane, a special**membrane that can resist wetting by liquids. The dissolved methane is withdrawn from the wastewater across**the omniphobic membrane, to a solvent that has high methane solubility. Key objectives of this research are (1)**identification of proper draw solvents, (2) demonstration of methane extraction, and (3) investigation of**impacts of environmental conditions on methane extraction efficiency. Successful demonstration of the**methane extraction will prove the potential of vastly available municipal wastewater as a source of clean**biofuel. Combined with the Omnivore process, the proposed method can potentially turn the currently**energy-consuming treatment processes into a net energy producer.