High Yield Fermentation to Enhance Biological Phosphorus Removal

9362161科尔曼这个项目的目标是评估一种生物养分去除过程，该过程提供了一种替代化学处理方法的方法，后者会产生用于处置的残留物。生物过程的成功和可靠性取决于从废水中生产发酵产品的能力，即醋酸盐和丙酸。初级处理污泥被发酵以提供额外的醋酸盐，但在使用这种方法的地方，醋酸盐的产量一直低于理论预期。这可能是由于消耗醋酸盐的其他硫酸盐还原和甲烷形成生物的生长所致。本项目要评估的工艺包括一次污泥发酵系统，该系统使用间歇充氧来抑制微生物，从而极大地提高发酵产量。为测试这一概念而设计的实验还将研究使用氧化还原电位测量来控制这一过程。更高的醋酸盐和丙酸盐产量将大大提高生物除磷系统的可靠性和性能。实验旨在利用亚基马市污水处理厂的初级污泥来测试这一创新概念。将研究充氧频率、充氧时间和控制方法，以及对乙酸乙酯和丙酸酯产率的影响。这是一项基于NSF 93-18，小型企业创新研究(SBIR)计划征集而提交的提案的第一阶段奖励。利用ORP测量的过程控制系统改进一次污泥发酵过程是可望的。这涉及到工艺技术、设备设计和可上市的工艺控制系统。迫切需要改进生物除磷技术，使其在经济上与化学处理系统相比具有竞争力。

9362161 Coleman The objective of this project is to evaluate a biological nutrient removal process that provides an alternative to chemical treatment methods, which produce a residue for disposal. The success and reliability of the biological process depends on the ability to produce a fermentation product from the wastewater; namely acetate and propionate. Primary treatment sludge is fermented to provide additional acetate, but where this has been used, the acetate production has been below theoretical expectations. This may be due to the growth of other sulfate reducing and methane forming organisms that consume the acetate. The process to be evaluated in this project involves a primary sludge fermentation system that uses intermittent oxygenation to inhibit the organisms and thus greatly increase the fermentation yield. Experiments designed to test this concept will also investigate the use of oxidation-reduction potential measurements to control the process. A higher acetate and propionate production will greatly improve the reliability and performance of biological phosphorus removal systems. Experiments are designed to test this innovative concept using primary sludge at the City of Yakima WWTP. Oxygenation frequency, duration and control methods will be studied and the effect on acetate and propionate yield will be followed. This is a Phase I award based on a proposal submitted in response to NSF 93-18, Small Business Innovation Research (SBIR) Program Solicitation. An improved primary sludge fermentation process with a process control system using ORP measurements is expected. This involves process technology, equipment design and a process control system that can be marketed. There is a significant need for improved technology for biological phosphorus removal economically competitive with chemical treatment systems.