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Theses/Dissertations

1995

Environmental engineering

Articles 1 - 3 of 3

Full-Text Articles in Engineering

Flocculation Kinetics Using Dual Coagulants: Effects Of Temperature, Addition Sequence, Rapid Mixing, And Sulfate , Bashaar Yakoub Ammary Jan 1995

Flocculation Kinetics Using Dual Coagulants: Effects Of Temperature, Addition Sequence, Rapid Mixing, And Sulfate , Bashaar Yakoub Ammary

Retrospective Theses and Dissertations

The effects of temperature, rapid mixing time and intensity, sulfate, and coagulant addition sequence of dual coagulants on the flocculation kinetics were studied. Either ferric nitrate alone or a cationic polymer alone or in combination as dual coagulants were used. The flocculation kinetics were monitored using mainly a Photometric Dispersion Analyzer (PDA). An Automatic Image Analyzer was also used in a limited number of experiments to monitor the flocculation kinetics. Kaolinite clay (with four concentrations: 5, 25, 50, and 100 mg/L) suspended in distilled water with added salinity was used at two temperatures (5 or 23°C) and two ...


Effect Of Various Mixing Devices And Patterns On Flocculation Kinetics In Water Treatment , Md. Wahid Sajjad Jan 1995

Effect Of Various Mixing Devices And Patterns On Flocculation Kinetics In Water Treatment , Md. Wahid Sajjad

Retrospective Theses and Dissertations

This research was designed to investigate the effects of different mixing variables on flocculation kinetics of kaolinite clay suspension at both warm and cold water temperatures (23°C and 5°C) using alum and ferric nitrate under a number of physico-chemical conditions. The following work was performed during this experimental study: (1) G versus rpm curves for different impellers were developed using calculated power based on measured torque. The torque was measured by a rotating torque meter using a photographic technique. (2) The effects of impeller geometry, rapid mixing intensity and pattern, concentration of coagulant dosing solution, coagulant injection pattern ...


Anaerobic Sequencing Batch Reactor Treatment Of Low Strength Wastewater , Udeme James Ndon Jan 1995

Anaerobic Sequencing Batch Reactor Treatment Of Low Strength Wastewater , Udeme James Ndon

Retrospective Theses and Dissertations

The treatment of low strength wastewater at various temperatures and hydraulic retention times in the anaerobic sequencing batch reactor (ASBR) was studied. The studies involved the use of four identical, laboratory scale anaerobic sequencing batch reactors (ASBRs), each having a working volume of six liters. One of the reactors was maintained at a 48 hour hydraulic retention time HRT, the second at a 24 hour HRT, the third at a 16 hour HRT and the fourth at a 12 hour HRT. A synthetic substrate (non fat dry milk; NFDM) was treated at concentrations of 1000, 800, 600 and 400 mg ...