TAILIEUCHUNG - Waste Water Treatment and Reutilization 2011 Part 6

Tham khảo tài liệu 'waste water treatment and reutilization 2011 part 6', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 124 Waste Water - Treatment and Reutilization Detection Detection Detection Fig. 8. Top nine probe internal tracing setup. The grey shaded areas are flow paths the darker the shade the faster the flow it represents. Bottom simulated results for each probe. Measurement Techniques for Wastewater Filtration Systems 125 Air Inlet Pipe Filling port End cap Air Port Fluid Level in reseivoir Graduated measuring tube Reservoir 50cm long Permeameter Cell Drain Port Down pipe Tripod Graduated Depth Gauge Digital Differential Manometer Levels in manometer takeoff tubes Gravel Surface Unsaturated gravel Free water surface Saturated gravel Manometer takeoff tubes Mariotte Siphon Level Stop cap Fig. 9. Experimental set-up for the in situ determination of the vertical hydraulic conductivity profile of high porous media not to scale . Reproduced from Knowles and Davies 2009b . Theory Magnetic resonance is a measurement technique which relies on the intrinsic properties of water molecules 9 . When in a magnetic field the nuclei of hydrogen molecules align with the field in a process known as diamagnetism. This alignment can be perturbed by applying a time varying magnetic field. By applying such a field at an appropriate frequency the nuclei can be made to rotate. Once the nuclei have been rotated away from the static magnetic field they will attempt to realign. As this occurs a process known as precession takes place in which the nuclei rotate about the axis of the static field much like a spinning top. Because each of the nuclei behaves like a tiny magnet a very small current can be induced in a conducting coil placed around the sample. In combination these effects can provide information about the properties of the molecules in the sample. The magnetic resonance probe developed for determining the ratios of biological and particulate clogging uses a series of applied time varying magnetic fields known as a spin echo sequence. This allows averaging of the signal before the

TÀI LIỆU LIÊN QUAN
69    272    11
TỪ KHÓA LIÊN QUAN
Đã phát hiện trình chặn quảng cáo AdBlock
Trang web này phụ thuộc vào doanh thu từ số lần hiển thị quảng cáo để tồn tại. Vui lòng tắt trình chặn quảng cáo của bạn hoặc tạm dừng tính năng chặn quảng cáo cho trang web này.