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Engineering Commons

Open Access. Powered by Scholars. Published by Universities.®

Lehigh University

Environmental Engineering

2016

Articles 1 - 2 of 2

Full-Text Articles in Engineering

Improved Stability Of Methane-Producing Anaerobic Biological Reactors Through Novel Use Of Ion-Exchange Fibers, Yu Tian Jan 2016

Improved Stability Of Methane-Producing Anaerobic Biological Reactors Through Novel Use Of Ion-Exchange Fibers, Yu Tian

Theses and Dissertations

The anaerobic digestion (AD) process uses a series of microbial reactions to convert organic compounds to a methane-rich biogas, and engineered application of this process allows energy recovery from industrial organic waste streams. Poor stability and susceptibility to failure, however, have greatly hindered more frequent application of AD for treatment of industrial wastes. The concern with process stability is particularly true where reactor pH fluctuates due to variations in organic loading. During the organic overloading, the huge difference of growth rate between acetogenic bacteria and methanogenic archaea could induce the accumulation of volatile fatty acids. The accumulated volatile fatty acids ...


Impact Of The Charge-Regulation Effect On Bacterial Growth And Bioavailability Of Sorbed Growth Substrates, Hankai Zhu Jan 2016

Impact Of The Charge-Regulation Effect On Bacterial Growth And Bioavailability Of Sorbed Growth Substrates, Hankai Zhu

Theses and Dissertations

Bacteria are typically found attached to surfaces. Their growth on surfaces can be beneficial, such as with trickling filters, bio-filters and bio-scrubbers, where the attached bacteria are used to biodegrade aqueous organic components. There are also plenty of systems where bacterial surface growth is not desirable, such as with biofilm formation in water distribution pipelines and pathogenic biofilm infections on medical implants and equipment. One consideration in all these systems is the interaction between the bacteria and the adhering surface, and specifically, how the physiochemical properties of the surface can influence bacterial growth. Previous studies demonstrated that the metabolic activity ...