UNS: Selection of Granules in Activated Sludge for Nutrient Removal and Phosphorus Recovery

1510665 stensel本研究项目结合了废水管理的两个主要需求，磷的回收和再利用，磷是所有生命不可再生的基本元素，以及去除氮和磷以保护地表水质量的需求，好氧颗粒污泥的显著发展提供了许多优于较老的絮凝活性污泥工艺的优势。研究目标集中在对颗粒污泥的评估上，将在两个工艺设计创新中发展，通过改造现有的活性污泥设施来促进颗粒污泥的生物去除。这项工作具有变革性，因为它是一种完全不同的方法，可以改善传统生物工艺应用的营养去除，同时提供具有成本效益的磷回收和可持续的工程方法。该项目将使粮食生产和经济领域的社会受益，因为它提供了磷的回收，以便在一个直接的地区进行再利用，并提供了一种减缓磷储备长期枯竭的手段。关键的研究需求与颗粒污泥的工艺条件选择以及对颗粒污泥微生物和物理特性的影响有关。主要具体目标如下：1)验证在改造设计中如何选择和维持颗粒强化生物除磷污泥的假设，2)确定所产生颗粒污泥的微生物生态和长期完整性，3)确定絮凝剂和颗粒污泥相对和不耦合的固相保留时间和溶解氧控制策略对其微生物种群除磷和除氮能力的影响，以及4)确定废污泥除磷池中磷的释放速率和可能达到的磷浓度。为了达到这些目标，将设计和操作实验室反应器，以模拟仅用于除磷的颗粒污泥系统，并在活性污泥生物营养物去除系统改造中使用颗粒污泥。基本的分子生物学技术将用于评估颗粒污泥的微生物种群，显微和其他物理测试方法将用于评估颗粒的大小，密度和强度。将获得强化磷生物去除、硝化和反硝化的工艺性能数据。拟议的项目对于吸引代表性不足的学生和女学生从事工程职业，为公众解决供水、环境保护和资源回收等重要问题非常重要。该项目通过与EPA营养管理中心和水环境研究基金会的合作，将向包括设计工程师、监管机构和公用事业公司在内的更广泛的受众推进新的成本效益技术。该项目的一个非常重要的影响是为磷的回收提供了更大的机会，磷是所有生命的有限和基本元素。

1510665StenselThis research project merges two major needs in wastewater management, the recovery and reuse of phosphorus, a nonrenewable essential element for all life, and the need for nitrogen and phosphorus removal to protect surface water quality, with a dramatic development in aerobic granular sludge that offers many advantages over the older more established flocculent activated sludge process. The research objectives are centered around the evaluation of granular sludge to be developed in two process design innovations that facilitate enhanced phosphorus biological removal by retrofitting of existing activated sludge facilities to granular sludge. The work is transformative in that it is a totally different approach to improve nutrient removal of conventional biological process applications while providing a cost effective phosphorus recovery and a sustainable engineering approach. The project will benefit society in the area of food production and economics by providing phosphorus recovery for reuse in an immediate area and to provide a means to slow down the long-term depletion of phosphorus reserves.The key research needs are related to process conditions that select for granular sludge and affect the granular sludge microbial and physical characteristics. Key specific objectives are as follows: 1) test hypotheses on how to select and maintain granular enhanced phosphorus biological removal sludge in the retrofit designs, 2) determine the microbial ecology and long term integrity of granular sludge produced, 3) determine the effect of the relative and uncoupled flocculent and granular sludge solids retention times and dissolved oxygen control strategy on their microbial populations phosphorus and nitrogen removal abilities, and, 4) determine the rate of phosphorus release and attainable phosphorus concentration possible in a waste sludge phosphorus stripping tank. To meet these objectives laboratory reactors will be designed and operated to simulate a granular sludge system for phosphorus removal only and the use of granular sludge in an activated sludge biological nutrient removal system retrofit. Fundamental molecular biology technique will be used to evaluate the granular sludge microbial populations and microscopic and other physical test methods will be used to assess the granules size, density and strength. Process performance data for enhanced phosphorus biological removal, nitrification, and denitrification will be obtained. The proposed project will be important for attracting under represented and female students to a career in engineering with interest in solving important issues of water supply, environmental protection and resource recovery for the public. The project through collaboration with an EPA nutrient management center and the Water Environment Research Foundation will advance new cost effective technology to a wider audience including design engineers, regulators and utilities. A very important impact of the project is in providing a greater opportunity for recovery of phosphorus, a finite and essential element for all life.