Donald R. Woods

The effect of filter pore size on the evaluation of aluminum coagulants to remove fulvic acid from water

Abstract Evaluation of aluminum coagulants to remove fulvic acid from water depends on the process of separating the precipitate from the liquid phase. Membrane filters are often used for this purpose. The degree of separation was found to depend on the filter pore size. Differences in removal efficiencies of up to 80% were observed when membrane filters with pore sizes of 0.45 and 0.10 μm were used for the solid-liquid separation. Membrane filters with a pore size of 0.45 μm under certain experimental conditions demonstrated deep-filter characteristics in the sense that in the initial steps of filtration, when the filter was clean, small particles were filtered through, but as the filter pores became clogged, the efficiency of the filter improved.

Introducing Explicit Training in Problem Solving into our Courses

ABSTRACT Details are given of the five stages needed to introduce a change by explicitly teaching problem solving. Examples and resources are given for each stage. These are: evaluate the teaching‐learning environment; define what problem solving skills we want to develop; explore the alternatives we have in terms of sequences, learning theories, relationships with other content and teaching/learning environments; develop a plan, and implement and evaluate.

Successful Trouble Shooting for Process Engineers: A Complete Course in Case Studies

본 고에서는 엘리베이터의 진동 및 소음의 발생원인 및 대책에 대한 일반적인 내용을 살펴보고, 입주완료 후 엘리베이터 소음이 문제가 된 아파트에서 소음 발생원인을 측정 분석하고 저감대책을 수립 적용한 후 그 성능을 확인하고, 이 대책안을 추후 건설될 아파트의 엘리베이터 소음 저감대책으로 설계단계에서부터 적극 고려될 수 있도록 제시하고자 한다.