SBIR Phase I: Membrane Hydrogen Dissolution for Bioremediation of High Strength Nitrate Waste

*9761250 Nemser这是小型企业创新研究第一阶段的提案。某些补救设施产生含有高浓度亚硝酸盐和氯化脂肪族碳氢化合物的废流。使用溶解的氢气作为电子供体，这些都可以被生物摧毁。与其他有机电子供体相比，氢在脱氮和还原脱卤化方面具有几个经济和操作上的优势。限制氢气使用的因素是它的低溶解度，即现有的商业气体溶解技术不能以安全、经济有效的方式溶解足够的氢气。基于膜的气体溶解技术可能会提供这些过程安全所需的氢气，但商业上适用于无泡气体溶解的膜性能较差，或存在生物污染，或两者兼而有之。紧凑型膜系统公司开发了一种用于微孔膜的高透气性全氟聚合物涂层。全氟聚合物涂层的光滑、无孔特性对生物污染具有很高的抵抗力，特别是与疏水微孔膜相比。这种涂层可以消除性能、污染和成本障碍，这些障碍阻碍了基于膜的气体溶解技术在连续生物过程中的使用。拟议的研究将论证使用全氟聚合物涂层膜装置作为生物反硝化高浓度硝酸盐和亚硝酸盐的氢源的技术可行性。除了硝酸盐、亚硝酸盐和氯代烃的去除外，这些全氟膜还可以用来将许多其他气体转移到水中或从水中转移出来。例如：用于促进细胞生长的生物反应器的氧化、水产养殖的氧化、废水的氧化、饮用水的臭氧氧化以提高质量和安全性。这种广泛的利用基础应该会带来商业成功的高概率和巨大的销售基础，从而在补救市场上实现较低的定价。***

*** 9761250 Nemser This is a Small Business Innovation Research Phase I proposal. Certain remediation facilities generate waste streams containing high concentrations of nitrite and chlorinated aliphatic hydrocarbons. These can be destroyed biologically using dissolved hydrogen gas as the electron donor. Hydrogen offers several economic and operational advantages over other organic electron donors in denitrification and in reductive dehalogenation. The factor limiting hydrogen use is its low solubility, i.e. existing commercial gas-dissolution technologies cannot dissolve sufficient hydrogen in a safe, cost effective manner. Membrane-based gas-dissolution technologies can potentially supply the hydrogen required for these processes safety, but commercially available membrane suitable for bubble-free gas-dissolution have poor performance, biological fouling, or both. Compact Membrane Systems, Inc., has developed a highly gas permeable perfluoropolymer coating for microporous membranes. The smooth, non-porous nature of the perfluoropolymer coating is highly resistant to biological fouling, especially compared to microporous hydrophobic membranes. This coating could remove the performance, fouling, and cost barriers that preclude the use of membrane-based gas dissolution technologies in continuous biological processes. The proposed study will demonstrate the technical feasibility of using perfluoropolymer-coated membrane devices as the hydrogen source for biological denitrification of high concentrations of nitrate and nitrite. In addition to nitrate, nitrite and chlorinated hydrocarbon removal, these perfluoromembranes can be used to transfer many other gases into or out of water. Examples include: oxygenation of bioreactors for enhanced cell growth, oxygenation of aquaculture, oxygenation of wastewater, ozonation of drinking water for enhanced quality and safety. This broad base of utilization should lead to both high probability of commercial success plus a large sales base to allow for lower pricing in remediation markets. ***